1109 lines
33 KiB
JavaScript
1109 lines
33 KiB
JavaScript
// deno-fmt-ignore-file
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// deno-lint-ignore-file
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// This code was bundled using `deno bundle` and it's not recommended to edit it manually
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const Constants = {
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TWO_PI: Math.PI * 2
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};
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const map = (value, x1, y1, x2, y2)=>(value - x1) * (y2 - x2) / (y1 - x1) + x2;
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const Constants1 = {
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TWO_PI: Math.PI * 2
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};
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class Vector {
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x;
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y;
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z;
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constructor(x = 0, y = 0, z = 0){
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this.x = x;
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this.y = y;
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this.z = z;
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}
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set(v, y, z) {
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if (arguments.length === 1 && typeof v !== "number") {
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this.set(v.x || v[0] || 0, v.y || v[1] || 0, v.z || v[2] || 0);
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} else {
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this.x = v;
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this.y = y || 0;
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this.z = z || 0;
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}
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}
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get() {
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return new Vector(this.x, this.y, this.z);
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}
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mag() {
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const x = this.x, y = this.y, z = this.z;
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return Math.sqrt(x * x + y * y + z * z);
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}
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magSq() {
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const x = this.x, y = this.y, z = this.z;
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return x * x + y * y + z * z;
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}
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setMag(v_or_len, len) {
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if (len === undefined) {
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len = v_or_len;
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this.normalize();
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this.mult(len);
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} else {
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const v = v_or_len;
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v.normalize();
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v.mult(len);
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return v;
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}
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}
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add(v, y, z) {
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if (arguments.length === 1 && typeof v !== 'number') {
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this.x += v.x;
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this.y += v.y;
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this.z += v.z;
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} else if (arguments.length === 2) {
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this.x += v;
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this.y += y ?? 0;
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} else {
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this.x += v;
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this.y += y ?? 0;
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this.z += z ?? 0;
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}
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}
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sub(v, y, z) {
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if (arguments.length === 1 && typeof v !== 'number') {
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this.x -= v.x;
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this.y -= v.y;
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this.z -= v.z;
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} else if (arguments.length === 2) {
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this.x -= v;
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this.y -= y ?? 0;
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} else {
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this.x -= v;
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this.y -= y ?? 0;
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this.z -= z ?? 0;
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}
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}
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mult(v) {
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if (typeof v === 'number') {
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this.x *= v;
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this.y *= v;
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this.z *= v;
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} else {
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this.x *= v.x;
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this.y *= v.y;
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this.z *= v.z;
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}
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return this;
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}
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div(v) {
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if (typeof v === 'number') {
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this.x /= v;
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this.y /= v;
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this.z /= v;
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} else {
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this.x /= v.x;
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this.y /= v.y;
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this.z /= v.z;
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}
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}
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rotate(angle) {
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const prev_x = this.x;
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const c = Math.cos(angle);
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const s = Math.sin(angle);
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this.x = c * this.x - s * this.y;
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this.y = s * prev_x + c * this.y;
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}
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dist(v) {
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const dx = this.x - v.x, dy = this.y - v.y, dz = this.z - v.z;
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return Math.sqrt(dx * dx + dy * dy + dz * dz);
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}
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dot(v, y, z) {
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if (arguments.length === 1 && typeof v !== 'number') {
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return this.x * v.x + this.y * v.y + this.z * v.z;
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}
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return this.x * v + this.y * y + this.z * z;
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}
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cross(v) {
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const x = this.x, y = this.y, z = this.z;
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return new Vector(y * v.z - v.y * z, z * v.x - v.z * x, x * v.y - v.x * y);
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}
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lerp(v_or_x, amt_or_y, z, amt) {
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const lerp_val = (start, stop, amt)=>{
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return start + (stop - start) * amt;
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};
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let x, y;
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if (arguments.length === 2 && typeof v_or_x !== 'number') {
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amt = amt_or_y;
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x = v_or_x.x;
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y = v_or_x.y;
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z = v_or_x.z;
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} else {
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x = v_or_x;
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y = amt_or_y;
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}
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this.x = lerp_val(this.x, x, amt);
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this.y = lerp_val(this.y, y, amt);
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this.z = lerp_val(this.z, z, amt);
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}
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normalize() {
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const m = this.mag();
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if (m > 0) {
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this.div(m);
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}
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return this;
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}
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limit(high) {
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if (this.mag() > high) {
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this.normalize();
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this.mult(high);
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}
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}
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heading() {
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return -Math.atan2(-this.y, this.x);
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}
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heading2D() {
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return this.heading();
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}
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toString() {
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return "[" + this.x + ", " + this.y + ", " + this.z + "]";
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}
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array() {
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return [
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this.x,
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this.y,
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this.z
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];
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}
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copy() {
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return new Vector(this.x, this.y, this.z);
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}
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drawDot() {
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if (!doodler) return;
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doodler.dot(this, {
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weight: 2,
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color: 'red'
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});
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}
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static fromAngle(angle, v) {
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if (v === undefined || v === null) {
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v = new Vector();
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}
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v.x = Math.cos(angle);
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v.y = Math.sin(angle);
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return v;
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}
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static random2D(v) {
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return Vector.fromAngle(Math.random() * (Math.PI * 2), v);
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}
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static random3D(v) {
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const angle = Math.random() * Constants1.TWO_PI;
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const vz = Math.random() * 2 - 1;
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const mult = Math.sqrt(1 - vz * vz);
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const vx = mult * Math.cos(angle);
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const vy = mult * Math.sin(angle);
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if (v === undefined || v === null) {
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v = new Vector(vx, vy, vz);
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} else {
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v.set(vx, vy, vz);
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}
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return v;
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}
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static dist(v1, v2) {
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return v1.dist(v2);
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}
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static dot(v1, v2) {
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return v1.dot(v2);
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}
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static cross(v1, v2) {
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return v1.cross(v2);
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}
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static add(v1, v2) {
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return new Vector(v1.x + v2.x, v1.y + v2.y, v1.z + v2.z);
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}
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static sub(v1, v2) {
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return new Vector(v1.x - v2.x, v1.y - v2.y, v1.z - v2.z);
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}
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static angleBetween(v1, v2) {
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return Math.acos(v1.dot(v2) / Math.sqrt(v1.magSq() * v2.magSq()));
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}
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static lerp(v1, v2, amt) {
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const retval = new Vector(v1.x, v1.y, v1.z);
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retval.lerp(v2, amt);
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return retval;
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}
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static vectorProjection(v1, v2) {
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v2 = v2.copy();
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v2.normalize();
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const sp = v1.dot(v2);
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v2.mult(sp);
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return v2;
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}
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static hypot2(a, b) {
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return Vector.dot(Vector.sub(a, b), Vector.sub(a, b));
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}
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}
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const init = (opt)=>{
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if (window.doodler) throw 'Doodler has already been initialized in this window';
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window.doodler = new Doodler(opt);
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window.doodler.init();
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};
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class Doodler {
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ctx;
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_canvas;
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layers = [];
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bg;
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framerate;
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get width() {
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return this.ctx.canvas.width;
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}
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get height() {
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return this.ctx.canvas.height;
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}
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draggables = [];
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constructor({ width , height , canvas , bg , framerate }){
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if (!canvas) {
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canvas = document.createElement('canvas');
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document.body.append(canvas);
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}
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this.bg = bg || 'white';
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this.framerate = framerate || 60;
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canvas.width = width;
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canvas.height = height;
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this._canvas = canvas;
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const ctx = canvas.getContext('2d');
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console.log(ctx);
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if (!ctx) throw 'Unable to initialize Doodler: Canvas context not found';
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this.ctx = ctx;
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}
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init() {
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this._canvas.addEventListener('mousedown', (e)=>this.onClick(e));
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this._canvas.addEventListener('mouseup', (e)=>this.offClick(e));
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this._canvas.addEventListener('mousemove', (e)=>{
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const rect = this._canvas.getBoundingClientRect();
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this.mouseX = e.clientX - rect.left;
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this.mouseY = e.clientY - rect.top;
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for (const d of this.draggables.filter((d)=>d.beingDragged)){
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d.point.add(e.movementX, e.movementY);
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}
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});
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this.startDrawLoop();
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}
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timer;
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startDrawLoop() {
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this.timer = setInterval(()=>this.draw(), 1000 / this.framerate);
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}
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draw() {
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this.ctx.fillStyle = this.bg;
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this.ctx.fillRect(0, 0, this.width, this.height);
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for (const [i, l] of (this.layers || []).entries()){
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l(this.ctx, i);
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}
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this.drawUI();
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}
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createLayer(layer) {
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this.layers.push(layer);
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}
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deleteLayer(layer) {
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this.layers = this.layers.filter((l)=>l !== layer);
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}
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moveLayer(layer, index) {
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let temp = this.layers.filter((l)=>l !== layer);
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temp = [
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...temp.slice(0, index),
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layer,
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...temp.slice(index)
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];
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this.layers = temp;
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}
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line(start, end, style) {
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this.setStyle(style);
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this.ctx.beginPath();
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this.ctx.moveTo(start.x, start.y);
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this.ctx.lineTo(end.x, end.y);
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this.ctx.stroke();
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}
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dot(at, style) {
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this.setStyle({
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...style,
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weight: 1
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});
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this.ctx.beginPath();
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this.ctx.arc(at.x, at.y, style?.weight || 1, 0, Constants1.TWO_PI);
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this.ctx.fill();
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}
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drawCircle(at, radius, style) {
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this.setStyle(style);
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this.ctx.beginPath();
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this.ctx.arc(at.x, at.y, radius, 0, Constants1.TWO_PI);
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this.ctx.stroke();
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}
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fillCircle(at, radius, style) {
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this.setStyle(style);
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this.ctx.beginPath();
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this.ctx.arc(at.x, at.y, radius, 0, Constants1.TWO_PI);
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this.ctx.fill();
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}
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drawRect(at, width, height, style) {
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this.setStyle(style);
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this.ctx.strokeRect(at.x, at.y, width, height);
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}
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fillRect(at, width, height, style) {
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this.setStyle(style);
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this.ctx.fillRect(at.x, at.y, width, height);
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}
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drawSquare(at, size, style) {
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this.drawRect(at, size, size, style);
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}
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fillSquare(at, size, style) {
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this.fillRect(at, size, size, style);
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}
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drawCenteredRect(at, width, height, style) {
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this.ctx.save();
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this.ctx.translate(-width / 2, -height / 2);
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this.drawRect(at, width, height, style);
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this.ctx.restore();
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}
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fillCenteredRect(at, width, height, style) {
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this.ctx.save();
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this.ctx.translate(-width / 2, -height / 2);
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this.fillRect(at, width, height, style);
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this.ctx.restore();
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}
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drawCenteredSquare(at, size, style) {
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this.drawCenteredRect(at, size, size, style);
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}
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fillCenteredSquare(at, size, style) {
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this.fillCenteredRect(at, size, size, style);
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}
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drawBezier(a, b, c, d, style) {
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this.setStyle(style);
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this.ctx.beginPath();
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this.ctx.moveTo(a.x, a.y);
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this.ctx.bezierCurveTo(b.x, b.y, c.x, c.y, d.x, d.y);
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this.ctx.stroke();
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}
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drawRotated(origin, angle, cb) {
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this.ctx.save();
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this.ctx.translate(origin.x, origin.y);
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this.ctx.rotate(angle);
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this.ctx.translate(-origin.x, -origin.y);
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cb();
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this.ctx.restore();
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}
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setStyle(style) {
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const ctx = this.ctx;
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ctx.fillStyle = style?.color || style?.fillColor || 'black';
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ctx.strokeStyle = style?.color || style?.strokeColor || 'black';
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ctx.lineWidth = style?.weight || 1;
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}
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mouseX = 0;
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mouseY = 0;
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registerDraggable(point, radius, style) {
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if (this.draggables.find((d)=>d.point === point)) return;
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const id = this.addUIElement('circle', point, radius, {
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fillColor: '#5533ff50',
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strokeColor: '#5533ff50'
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});
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this.draggables.push({
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point,
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radius,
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style,
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id
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});
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}
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unregisterDraggable(point) {
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for (const d of this.draggables){
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if (d.point === point) {
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this.removeUIElement(d.id);
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}
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}
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this.draggables = this.draggables.filter((d)=>d.point !== point);
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}
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onClick(e) {
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for (const d of this.draggables){
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if (d.point.dist(new Vector(this.mouseX, this.mouseY)) <= d.radius) {
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d.beingDragged = true;
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} else d.beingDragged = false;
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}
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}
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offClick(e) {
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for (const d of this.draggables){
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d.beingDragged = false;
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}
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}
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uiElements = new Map();
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uiDrawing = {
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rectangle: (...args)=>{
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!args[3].noFill && this.fillRect(args[0], args[1], args[2], args[3]);
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!args[3].noStroke && this.drawRect(args[0], args[1], args[2], args[3]);
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},
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square: (...args)=>{
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!args[2].noFill && this.fillSquare(args[0], args[1], args[2]);
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!args[2].noStroke && this.drawSquare(args[0], args[1], args[2]);
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},
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circle: (...args)=>{
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!args[2].noFill && this.fillCircle(args[0], args[1], args[2]);
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!args[2].noStroke && this.drawCircle(args[0], args[1], args[2]);
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}
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};
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drawUI() {
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for (const [shape, ...args] of this.uiElements.values()){
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this.uiDrawing[shape].apply(null, args);
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}
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}
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addUIElement(shape, ...args) {
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const id = crypto.randomUUID();
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for (const arg of args){
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delete arg.color;
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}
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this.uiElements.set(id, [
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shape,
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...args
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]);
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return id;
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}
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removeUIElement(id) {
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this.uiElements.delete(id);
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}
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}
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class ComplexPath {
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points = [];
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radius = 50;
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ctx;
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constructor(points){
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points && (this.points = points);
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}
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setContext(ctx) {
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this.ctx = ctx;
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}
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draw() {
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if (!this.ctx || !this.points.length) return;
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const ctx = this.ctx;
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ctx.save();
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ctx.lineWidth = 2;
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ctx.strokeStyle = 'white';
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ctx.setLineDash([
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21,
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6
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]);
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let last = this.points[this.points.length - 1];
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for (const point of this.points){
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ctx.beginPath();
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ctx.moveTo(last.x, last.y);
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ctx.lineTo(point.x, point.y);
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ctx.stroke();
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last = point;
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}
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ctx.restore();
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}
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}
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class PathSegment {
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points;
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ctx;
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length;
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constructor(points){
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this.points = points;
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this.length = this.calculateApproxLength(100);
|
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}
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setContext(ctx) {
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this.ctx = ctx;
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}
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draw() {
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const [a, b, c, d] = this.points;
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doodler.drawBezier(a, b, c, d, {
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strokeColor: '#ffffff50'
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});
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}
|
|
getPointAtT(t) {
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const [a, b, c, d] = this.points;
|
|
const res = a.copy();
|
|
res.add(Vector.add(a.copy().mult(-3), b.copy().mult(3)).mult(t));
|
|
res.add(Vector.add(Vector.add(a.copy().mult(3), b.copy().mult(-6)), c.copy().mult(3)).mult(Math.pow(t, 2)));
|
|
res.add(Vector.add(Vector.add(a.copy().mult(-1), b.copy().mult(3)), Vector.add(c.copy().mult(-3), d.copy())).mult(Math.pow(t, 3)));
|
|
return res;
|
|
}
|
|
getClosestPoint(v) {
|
|
const resolution = 1 / 25;
|
|
let closest = this.points[0];
|
|
let closestDistance = this.points[0].dist(v);
|
|
let closestT = 0;
|
|
for(let i = 0; i < 25; i++){
|
|
const point = this.getPointAtT(i * resolution);
|
|
const distance = v.dist(point);
|
|
if (distance < closestDistance) {
|
|
closest = point;
|
|
closestDistance = distance;
|
|
closestT = i * resolution;
|
|
}
|
|
}
|
|
return [
|
|
closest,
|
|
closestDistance,
|
|
closestT
|
|
];
|
|
}
|
|
getPointsWithinRadius(v, r) {
|
|
const points = [];
|
|
const resolution = 1 / 25;
|
|
for(let i = 0; i < 25; i++){
|
|
const point = this.getPointAtT(i * resolution);
|
|
const distance = v.dist(point);
|
|
if (distance < r) {
|
|
points.push([
|
|
i * resolution,
|
|
this
|
|
]);
|
|
}
|
|
}
|
|
return points;
|
|
}
|
|
tangent(t) {
|
|
const [a, b, c, d] = this.points;
|
|
const res = Vector.sub(b, a).mult(3 * Math.pow(1 - t, 2));
|
|
res.add(Vector.add(Vector.sub(c, b).mult(6 * (1 - t) * t), Vector.sub(d, c).mult(3 * Math.pow(t, 2))));
|
|
return res;
|
|
}
|
|
doesIntersectCircle(x, y, r) {
|
|
const v = new Vector(x, y);
|
|
const resolution = 1 / 25;
|
|
let distance = Infinity;
|
|
let t;
|
|
for(let i = 0; i < 25; i++){
|
|
if (i !== 25 - 1) {
|
|
const a = this.getPointAtT(i * resolution);
|
|
const b = this.getPointAtT((i + 1) * resolution);
|
|
const ac = Vector.sub(v, a);
|
|
const ab = Vector.sub(b, a);
|
|
const d = Vector.add(Vector.vectorProjection(ac, ab), a);
|
|
const ad = Vector.sub(d, a);
|
|
const k = Math.abs(ab.x) > Math.abs(ab.y) ? ad.x / ab.x : ad.y / ab.y;
|
|
let dist;
|
|
if (k <= 0.0) {
|
|
dist = Vector.hypot2(v, a);
|
|
} else if (k >= 1.0) {
|
|
dist = Vector.hypot2(v, b);
|
|
}
|
|
dist = Vector.hypot2(v, d);
|
|
if (dist < distance) {
|
|
distance = dist;
|
|
t = i * resolution;
|
|
}
|
|
}
|
|
}
|
|
if (distance < r) return t;
|
|
return false;
|
|
}
|
|
calculateApproxLength(resolution = 25) {
|
|
const stepSize = 1 / resolution;
|
|
const points = [];
|
|
for(let i = 0; i <= resolution; i++){
|
|
const current = stepSize * i;
|
|
points.push(this.getPointAtT(current));
|
|
}
|
|
return points.reduce((acc, cur)=>{
|
|
const prev = acc.prev;
|
|
acc.prev = cur;
|
|
if (!prev) return acc;
|
|
acc.length += cur.dist(prev);
|
|
return acc;
|
|
}, {
|
|
prev: undefined,
|
|
length: 0
|
|
}).length;
|
|
}
|
|
calculateEvenlySpacedPoints(spacing, resolution = 1) {
|
|
const points = [];
|
|
points.push(this.points[0]);
|
|
let prev = points[0];
|
|
let distSinceLastEvenPoint = 0;
|
|
let t = 0;
|
|
const div = Math.ceil(this.length * resolution * 10);
|
|
while(t < 1){
|
|
t += 1 / div;
|
|
const point = this.getPointAtT(t);
|
|
distSinceLastEvenPoint += prev.dist(point);
|
|
if (distSinceLastEvenPoint >= spacing) {
|
|
const overshoot = distSinceLastEvenPoint - spacing;
|
|
const evenPoint = Vector.add(point, Vector.sub(point, prev).normalize().mult(overshoot));
|
|
distSinceLastEvenPoint = overshoot;
|
|
points.push(evenPoint);
|
|
prev = evenPoint;
|
|
}
|
|
prev = point;
|
|
}
|
|
return points;
|
|
}
|
|
}
|
|
class Mover {
|
|
position;
|
|
velocity;
|
|
acceleration;
|
|
maxSpeed;
|
|
maxForce;
|
|
_trailingPoint;
|
|
_leadingPoint;
|
|
get trailingPoint() {
|
|
const desired = this.velocity.copy();
|
|
desired.normalize();
|
|
desired.mult(-this._trailingPoint);
|
|
return Vector.add(this.position, desired);
|
|
}
|
|
get leadingPoint() {
|
|
const desired = this.velocity.copy();
|
|
desired.normalize();
|
|
desired.mult(this._leadingPoint);
|
|
return Vector.add(this.position, desired);
|
|
}
|
|
ctx;
|
|
boundingBox;
|
|
constructor(posOrRandom, vel, acc){
|
|
if (typeof posOrRandom === 'boolean' && posOrRandom) {
|
|
this.position = Vector.random2D(new Vector());
|
|
this.velocity = Vector.random2D(new Vector());
|
|
this.acceleration = new Vector();
|
|
} else {
|
|
this.position = posOrRandom || new Vector();
|
|
this.velocity = vel || new Vector();
|
|
this.acceleration = acc || new Vector();
|
|
}
|
|
this.boundingBox = {
|
|
size: new Vector(20, 10),
|
|
pos: new Vector(this.position.x - 10, this.position.y - 5)
|
|
};
|
|
this.maxSpeed = 3;
|
|
this.maxForce = .3;
|
|
this._trailingPoint = 0;
|
|
this._leadingPoint = 0;
|
|
this.init();
|
|
}
|
|
init() {}
|
|
move() {
|
|
this.velocity.limit(this.maxSpeed);
|
|
this.acceleration.limit(this.maxForce);
|
|
this.velocity.add(this.acceleration);
|
|
this.position.add(this.velocity);
|
|
this.edges();
|
|
this.draw();
|
|
}
|
|
edges() {
|
|
if (!this.ctx) return;
|
|
if (this.position.x > this.ctx.canvas.width) this.position.x = 0;
|
|
if (this.position.y > this.ctx.canvas.height) this.position.y = 0;
|
|
if (this.position.x < 0) this.position.x = this.ctx.canvas.width;
|
|
if (this.position.y < 0) this.position.y = this.ctx.canvas.height;
|
|
}
|
|
draw() {
|
|
doodler.drawRotated(this.position, this.velocity.heading() || 0, ()=>{
|
|
doodler.fillCenteredRect(this.position, this.boundingBox.size.x, this.boundingBox.size.y, {
|
|
fillColor: 'white'
|
|
});
|
|
});
|
|
if (!this.ctx) return;
|
|
this.ctx.fillStyle = 'white';
|
|
this.ctx.save();
|
|
this.ctx.translate(this.position.x, this.position.y);
|
|
this.ctx.rotate(this.velocity.heading() || 0);
|
|
this.ctx.translate(-this.position.x, -this.position.y);
|
|
this.ctx.translate(-(this.boundingBox.size.x / 2), -(this.boundingBox.size.y / 2));
|
|
this.ctx.fillRect(this.position.x, this.position.y, this.boundingBox.size.x, this.boundingBox.size.y);
|
|
this.ctx.restore();
|
|
}
|
|
setContext(ctx) {
|
|
this.ctx = ctx;
|
|
}
|
|
applyForce(force) {
|
|
this.acceleration.add(force);
|
|
}
|
|
static edges(point, width, height) {
|
|
if (point.x > width) point.x = 0;
|
|
if (point.y > height) point.y = 0;
|
|
if (point.x < 0) point.x = width;
|
|
if (point.y < 0) point.y = height;
|
|
}
|
|
}
|
|
class Follower extends Mover {
|
|
debug = true;
|
|
follow(toFollow) {
|
|
if (toFollow instanceof ComplexPath) {
|
|
const predict = this.velocity.copy();
|
|
predict.normalize();
|
|
predict.mult(25);
|
|
const predictpos = Vector.add(this.position, predict);
|
|
if (this.ctx) Mover.edges(predict, this.ctx.canvas.width, this.ctx.canvas.height);
|
|
let normal = null;
|
|
let target = null;
|
|
let worldRecord = 1000000;
|
|
for(let i = 0; i < toFollow.points.length; i++){
|
|
let a = toFollow.points[i];
|
|
let b = toFollow.points[(i + 1) % toFollow.points.length];
|
|
let normalPoint = getNormalPoint(predictpos, a, b);
|
|
let dir = Vector.sub(b, a);
|
|
if (normalPoint.x < Math.min(a.x, b.x) || normalPoint.x > Math.max(a.x, b.x) || normalPoint.y < Math.min(a.y, b.y) || normalPoint.y > Math.max(a.y, b.y)) {
|
|
normalPoint = b.copy();
|
|
a = toFollow.points[(i + 1) % toFollow.points.length];
|
|
b = toFollow.points[(i + 2) % toFollow.points.length];
|
|
dir = Vector.sub(b, a);
|
|
}
|
|
const d = Vector.dist(predictpos, normalPoint);
|
|
if (d < worldRecord) {
|
|
worldRecord = d;
|
|
normal = normalPoint;
|
|
dir.normalize();
|
|
dir.mult(25);
|
|
target = normal.copy();
|
|
target.add(dir);
|
|
}
|
|
if (worldRecord > toFollow.radius) {
|
|
return this.seek(target);
|
|
}
|
|
}
|
|
if (this.debug && this.ctx) {
|
|
this.ctx.strokeStyle = 'red';
|
|
this.ctx.fillStyle = 'pink';
|
|
this.ctx.beginPath();
|
|
this.ctx.moveTo(this.position.x, this.position.y);
|
|
this.ctx.lineTo(predictpos.x, predictpos.y);
|
|
this.ctx.stroke();
|
|
this.ctx.beginPath();
|
|
this.ctx.arc(predictpos.x, predictpos.y, 4, 0, Constants.TWO_PI);
|
|
this.ctx.fill();
|
|
this.ctx.stroke();
|
|
this.ctx.beginPath();
|
|
this.ctx.arc(normal.x, normal.y, 4, 0, Constants.TWO_PI);
|
|
this.ctx.fill();
|
|
this.ctx.stroke();
|
|
this.ctx.beginPath();
|
|
this.ctx.moveTo(predictpos.x, predictpos.y);
|
|
this.ctx.lineTo(target.x, target.y);
|
|
this.ctx.stroke();
|
|
this.ctx.beginPath();
|
|
this.ctx.arc(target.x, target.y, 8, 0, Constants.TWO_PI);
|
|
this.ctx.fill();
|
|
this.ctx.stroke();
|
|
}
|
|
}
|
|
}
|
|
seek(target, strength = 1) {
|
|
const desired = Vector.sub(target, this.position);
|
|
desired.normalize();
|
|
desired.mult(this.maxSpeed);
|
|
const steer = Vector.sub(desired, this.velocity);
|
|
steer.limit(this.maxForce);
|
|
this.applyForce(steer.mult(strength));
|
|
}
|
|
link(target) {
|
|
this.position = target.trailingPoint;
|
|
this.seek(target.trailingPoint);
|
|
}
|
|
arrive(target) {
|
|
const desired = Vector.sub(target, this.position);
|
|
const d = desired.mag();
|
|
let speed = this.maxSpeed;
|
|
if (d < 10) {
|
|
speed = map(d, 0, 100, 0, this.maxSpeed);
|
|
}
|
|
desired.setMag(speed);
|
|
const steer = Vector.sub(desired, this.velocity);
|
|
steer.limit(this.maxForce);
|
|
this.applyForce(steer);
|
|
}
|
|
}
|
|
function getNormalPoint(p, a, b) {
|
|
const ap = Vector.sub(p, a);
|
|
const ab = Vector.sub(b, a);
|
|
ab.normalize();
|
|
ab.mult(ap.dot(ab));
|
|
const normalPoint = Vector.add(a, ab);
|
|
return normalPoint;
|
|
}
|
|
class Train extends Follower {
|
|
nodes;
|
|
currentTrack;
|
|
speed;
|
|
follower;
|
|
followers;
|
|
constructor(track, length){
|
|
super(track.points[0].copy());
|
|
this.maxSpeed = 2;
|
|
this.speed = 1;
|
|
this.currentTrack = track;
|
|
this.velocity = this.currentTrack.tangent(0).normalize().mult(this.maxSpeed);
|
|
this.addCar(length);
|
|
this.maxForce = .2;
|
|
}
|
|
init() {
|
|
this.boundingBox.size.set(30, 10);
|
|
this._trailingPoint = 30;
|
|
}
|
|
move() {
|
|
this.follow();
|
|
super.move();
|
|
this.follower?.move();
|
|
}
|
|
follow() {
|
|
const [_, t] = this.currentTrack.followTrack(this);
|
|
this.velocity = this.currentTrack.tangent(t);
|
|
this.velocity.normalize().mult(this.speed || this.maxSpeed);
|
|
}
|
|
setContext(ctx) {
|
|
super.setContext(ctx);
|
|
this.follower?.setContext(ctx);
|
|
}
|
|
addCar(length) {
|
|
console.log(length);
|
|
if (length) this.follower = new TrainCar(this.currentTrack, length - 1);
|
|
this.follower?.setTarget(this);
|
|
this.follower?.position.set(this.trailingPoint);
|
|
this._trailingPoint -= 2;
|
|
}
|
|
}
|
|
class TrainCar extends Train {
|
|
target;
|
|
setTarget(t) {
|
|
this.target = t;
|
|
}
|
|
init() {
|
|
this.boundingBox.size.set(20, 10);
|
|
this._trailingPoint = 25;
|
|
this.maxSpeed = this.maxSpeed * 2;
|
|
this.maxForce = this.maxForce * 2;
|
|
}
|
|
move() {
|
|
if (this.target) {
|
|
if (this.position.dist(this.target.position) > this.target.position.dist(this.target.trailingPoint)) {
|
|
this.arrive(this.currentTrack.getNearestPoint(this.target.trailingPoint));
|
|
this.speed = this.target.speed;
|
|
super.move();
|
|
} else {
|
|
this.draw();
|
|
this.follower?.draw();
|
|
}
|
|
}
|
|
}
|
|
edges() {}
|
|
}
|
|
class Track extends PathSegment {
|
|
editable = false;
|
|
next;
|
|
prev;
|
|
id;
|
|
constructor(points, next, prev){
|
|
super(points);
|
|
this.id = crypto.randomUUID();
|
|
this.next = next || this;
|
|
this.prev = prev || this;
|
|
}
|
|
followTrack(train) {
|
|
const predict = train.velocity.copy();
|
|
predict.normalize();
|
|
predict.mult(1);
|
|
const predictpos = Vector.add(train.position, predict);
|
|
let [closest, closestDistance, closestT] = this.getClosestPoint(predictpos);
|
|
let mostValid = this;
|
|
if (this.next !== this) {
|
|
const [point, distance, t] = this.next.getClosestPoint(predictpos);
|
|
if (distance < closestDistance) {
|
|
closest = point;
|
|
closestDistance = distance;
|
|
mostValid = this.next;
|
|
closestT = t;
|
|
}
|
|
}
|
|
if (this.prev !== this) {
|
|
const [point1, distance1, t1] = this.next.getClosestPoint(predictpos);
|
|
if (distance1 < closestDistance) {
|
|
closest = point1;
|
|
closestDistance = distance1;
|
|
mostValid = this.next;
|
|
closestT = t1;
|
|
}
|
|
}
|
|
train.currentTrack = mostValid;
|
|
train.arrive(closest);
|
|
return [
|
|
closest,
|
|
closestT
|
|
];
|
|
}
|
|
getNearestPoint(p) {
|
|
let [closest, closestDistance] = this.getClosestPoint(p);
|
|
if (this.next !== this) {
|
|
const [point, distance, t] = this.next.getClosestPoint(p);
|
|
if (distance < closestDistance) {
|
|
closest = point;
|
|
closestDistance = distance;
|
|
}
|
|
}
|
|
if (this.prev !== this) {
|
|
const [point1, distance1, t1] = this.next.getClosestPoint(p);
|
|
if (distance1 < closestDistance) {
|
|
closest = point1;
|
|
closestDistance = distance1;
|
|
}
|
|
}
|
|
return closest;
|
|
}
|
|
getAllPointsInRange(v, r) {
|
|
const points = this.getPointsWithinRadius(v, r).concat(this.next.getPointsWithinRadius(v, r), this.prev.getPointsWithinRadius(v, r));
|
|
return points;
|
|
}
|
|
draw() {
|
|
super.draw();
|
|
if (this.editable) for (const e of this.points){
|
|
e.drawDot();
|
|
}
|
|
}
|
|
}
|
|
class Spline {
|
|
segments = [];
|
|
ctx;
|
|
evenPoints;
|
|
constructor(segs){
|
|
this.segments = segs;
|
|
this.evenPoints = this.calculateEvenlySpacedPoints(3);
|
|
}
|
|
setContext(ctx) {
|
|
this.ctx = ctx;
|
|
for (const segment of this.segments){
|
|
segment.setContext(ctx);
|
|
}
|
|
}
|
|
draw() {
|
|
for (const segment of this.segments){
|
|
segment.draw();
|
|
}
|
|
}
|
|
calculateEvenlySpacedPoints(spacing, resolution = 1) {
|
|
return this.segments.flatMap((s)=>s.calculateEvenlySpacedPoints(spacing, resolution));
|
|
}
|
|
followEvenPoints(t) {
|
|
const i = Math.floor(t);
|
|
const a = this.evenPoints[i];
|
|
const b = this.evenPoints[(i + 1) % this.evenPoints.length];
|
|
try {
|
|
return Vector.lerp(a, b, t % 1);
|
|
} catch {
|
|
console.log(t, i, a, b);
|
|
}
|
|
}
|
|
}
|
|
const generateSquareTrack = ()=>{
|
|
const first = new Track([
|
|
new Vector(20, 40),
|
|
new Vector(20, 100),
|
|
new Vector(20, 300),
|
|
new Vector(20, 360)
|
|
]);
|
|
const second = new Track([
|
|
first.points[3],
|
|
new Vector(20, 370),
|
|
new Vector(30, 380),
|
|
new Vector(40, 380)
|
|
]);
|
|
const third = new Track([
|
|
second.points[3],
|
|
new Vector(100, 380),
|
|
new Vector(300, 380),
|
|
new Vector(360, 380)
|
|
]);
|
|
const fourth = new Track([
|
|
third.points[3],
|
|
new Vector(370, 380),
|
|
new Vector(380, 370),
|
|
new Vector(380, 360)
|
|
]);
|
|
const fifth = new Track([
|
|
fourth.points[3],
|
|
new Vector(380, 300),
|
|
new Vector(380, 100),
|
|
new Vector(380, 40)
|
|
]);
|
|
const sixth = new Track([
|
|
fifth.points[3],
|
|
new Vector(380, 30),
|
|
new Vector(370, 20),
|
|
new Vector(360, 20)
|
|
]);
|
|
const seventh = new Track([
|
|
sixth.points[3],
|
|
new Vector(300, 20),
|
|
new Vector(100, 20),
|
|
new Vector(40, 20)
|
|
]);
|
|
const eighth = new Track([
|
|
seventh.points[3],
|
|
new Vector(30, 20),
|
|
new Vector(20, 30),
|
|
first.points[0]
|
|
]);
|
|
const tracks = [
|
|
first,
|
|
second,
|
|
third,
|
|
fourth,
|
|
fifth,
|
|
sixth,
|
|
seventh,
|
|
eighth
|
|
];
|
|
for (const [i, track] of tracks.entries()){
|
|
track.next = tracks[(i + 1) % tracks.length];
|
|
track.prev = tracks.at(i - 1);
|
|
}
|
|
return new Spline([
|
|
first,
|
|
second,
|
|
third,
|
|
fourth,
|
|
fifth,
|
|
sixth,
|
|
seventh,
|
|
eighth
|
|
]);
|
|
};
|
|
init({
|
|
width: 400,
|
|
height: 400,
|
|
bg: '#333'
|
|
});
|
|
const path = generateSquareTrack();
|
|
let t = 0;
|
|
const trains = Array(1).fill(null).map((_, i)=>new Train(path.segments[i % path.segments.length], 5));
|
|
doodler.createLayer(()=>{
|
|
path.draw();
|
|
for (const p of path.evenPoints){
|
|
p.drawDot();
|
|
}
|
|
const point = path.followEvenPoints(t);
|
|
point && doodler.drawCircle(point, 5, {
|
|
strokeColor: 'green'
|
|
});
|
|
t = (t + 1 / 3) % path.evenPoints.length;
|
|
});
|
|
document.addEventListener('keyup', (e)=>{
|
|
if (e.key === 'd') {}
|
|
if (e.key === 'ArrowUp') {}
|
|
if (e.key === 'ArrowDown') {
|
|
for (const train of trains){
|
|
train.speed -= .1;
|
|
}
|
|
}
|
|
if (e.key === 'e') {
|
|
for (const t of path.segments){
|
|
t.editable = !t.editable;
|
|
for (const p of t.points){
|
|
if (t.editable) doodler.registerDraggable(p, 10);
|
|
else doodler.unregisterDraggable(p);
|
|
}
|
|
}
|
|
}
|
|
});
|
|
document.addEventListener('keydown', (e)=>{
|
|
if (e.ctrlKey && e.key === 's') {
|
|
e.preventDefault();
|
|
path.segments.forEach((s)=>{
|
|
s.next = s.next.id;
|
|
s.prev = s.prev.id;
|
|
delete s.ctx;
|
|
});
|
|
delete path.ctx;
|
|
const json = JSON.stringify(path);
|
|
localStorage.setItem('railPath', json);
|
|
}
|
|
});
|