// Liam Egan // 2019 let initialise = function() { let application = new Application(); // application.scaleFactor = 2; // application.clearOnRedraw = Application.FADE; application.fadeColour = 'rgba(0,0,0,.12)'; application.fillColour = 'rgba(30,30,30,1)'; application.onResize(); let vfield = new VectorField(); vfield.scale = 1000; vfield.amplitude = 10; // vfield.debug = true; application.addActor(vfield); let maxNum = 1000; let num = 0; let addTracer = (position, colour)=> { if(num > maxNum) return; let tracer = new BranchTracer(position.x, position.y); tracer.field = vfield; let momentum = new Vector(Math.random(), Math.random()); momentum.length = Math.random() * 2; tracer.momentum = momentum; tracer.friction = 0.97; if(colour) { tracer.colour = colour; } else { tracer.colour = 'RGBA('+ 100 + Math.round(Math.random() * 155) +','+ 100 + Math.round(Math.random() * 155) +',255,0.5)'; } application.addActor(tracer); num = application.actors.length; return tracer; } let seed = addTracer(new Vector(window.innerWidth / 2, window.innerHeight / 2), 'RGBA(255, 100, 100, 0.5)'); seed.initial = true; seed.branchChance = 1; seed.friction = 0.989175; seed.onBranch = addTracer; // setInterval(()=> { // vfield.z = Math.random() * 10000; // }, 10000) let stage = application.stage; document.body.appendChild(stage); application.onPointerMove({ clientX: window.innerWidth / 2, clientY: window.innerHeight / 2 }); application.render(); application.animating = true; // application.runFor(60 * 120); return; } class Application { constructor() { this.stage = document.createElement('canvas'); this.animate = this.animate.bind(this); this.onResize = this.onResize.bind(this); this.onPointerDown = this.onPointerDown.bind(this); this.onPointerup = this.onPointerup.bind(this); this.onPointerMove = this.onPointerMove.bind(this); this.initialiseEvents(); } initialiseEvents() { window.addEventListener('resize', this.onResize, false); document.addEventListener('pointerdown', this.onPointerDown, false); document.addEventListener('pointerup', this.onPointerup, false); document.addEventListener('pointermove', this.onPointerMove, false); } deInitialiseEvents() { window.removeEventListener('resize', this.onResize, false); document.removeEventListener('pointerdown', this.onPointerDown, false); document.removeEventListener('pointerup', this.onPointerup, false); document.removeEventListener('pointermove', this.onPointerMove, false); } addActor(actor) { if(actor instanceof Actor) { this.actors.push(actor); } } runFor(ticks) { let interval = 1 / 60; let i = 0; for(i; i < ticks; i++) { this.triggerEvent('application-animate', { now: this.now, then: this.then, interval: interval, application: this }); this.render(); } } animate(delta) { this.now = Date.now(); let interval = this.now - this.then; this.triggerEvent('application-animate', { now: this.now, then: this.then, interval: interval, application: this }); this.render(delta); this.then = this.now; // remove dead actors if(delta - this.removalTest > 5000 || !this.removalTest) { this.removalTest = delta for(let i = this.actors.length-1; i >= 0; i--) { if(this.actors[i].dead === true) { this.actors.splice(i, 1); } } } if(this.animating) { requestAnimationFrame(this.animate); } } render(delta) { let dims = this.dimensions; if(this.animatingOut) { this.opacity += .02; if(this.opacity >= 1) this.animatingOut = false; this.context.fillStyle = `rgba(10,10,10,${this.opacity}`; this.context.fillRect(0,0, dims.width, dims.height); } if(this.clearOnRedraw == Application.CLEAR) { this.context.clearRect(0, 0, dims.width, dims.height); } else if(this.clearOnRedraw == Application.FADE) { this.context.fillStyle = this.fadeColour; this.context.fillRect(0,0, dims.width, dims.height); } this.actors.forEach((actor)=> { actor.render(this); }); } onResize(e) { this.dimensions = new Vector(window.innerWidth*2, window.innerHeight*2); } onPointerDown(e) { } onPointerup(e) { } onPointerMove(e) { let pointer = new Vector(e.clientX, e.clientY); this.triggerEvent('application-pointermove', { pointer: pointer }); } triggerEvent(event, data) { if (window.CustomEvent) { var event = new CustomEvent(event, {detail: data}); } else { var event = document.createEvent('CustomEvent'); event.initCustomEvent(event, true, true, data); } document.dispatchEvent(event); } get actors() { if( !this._actors ) this._actors = []; return this._actors; } set scaleFactor(value) { if(value >= 1) { this._scaleFactor = value; this.onResize(); } } get scaleFactor() { return this._scaleFactor || 1; } set dimensions(value) { if( value instanceof Vector ) { value.scale(this.scaleFactor) this.stage.width = value.width; this.stage.height = value.height; this.context.fillStyle = this.fillColour; this.context.fillRect(0,0, this.dimensions.width, this.dimensions.height); this._dimensions = value; } } get dimensions() { return this._dimensions || new Vector(0,0) } set stage(value) { if(value instanceof HTMLCanvasElement) { value.className = this.className; this._stage = value; this.context = this.stage.getContext('2d'); this.context.fillStyle = this.fillColour; this.context.fillRect(0,0, this.dimensions.width, this.dimensions.height); this.onResize(); } } get stage() { return this._stage || null; } set now(value) { if(!isNaN(value)) this._now = value } get now() { return this._now || 0; } set then(value) { if(!isNaN(value)) this._then = value } get then() { return this._then || 0; } set animating(value) { if(value === true && this.animating !== true) { this._animating = true; this.now = Date.now(); this.then = this.now; requestAnimationFrame(this.animate); } } get animating() { return this._animating === true; } set fadeColour(value) { this._fadeColour = value; } get fadeColour() { return this._fadeColour || 'rgba(255,255,255,.5)'; } set fillColour(value) { this._fillColour = value; } get fillColour() { return this._fillColour || 'rgba(255,255,255,1)'; } set clearOnRedraw(value) { if([Application.NOCLEAR, Application.CLEAR, Application.FADE].indexOf(value) > -1 ) { this._clearOnRedraw = value; } } get clearOnRedraw() { return this._clearOnRedraw || Application.NOCLEAR; } get className() { return 'drawer'; } } Application.NOCLEAR = 0; Application.CLEAR = 1; Application.FADE = 2; class Actor { constructor(x, y, w, h) { this.dimensions = new Vector(w, h); this.position = new Vector(x, y); } render() { } set dimensions(value) { if(value instanceof Vector) this._dimensions = value; } get dimensions() { return this._dimensions || new Vector(0,0); } set position(value) { if(value instanceof Vector) this._position = value; } get position() { return this._position || new Vector(0,0); } } class VectorField extends Actor { constructor(x = 0, y = 0, w = 0, h = 0) { super(x, y, w, h); this.noise = new Noise(); this.helpers = []; this.mousepos = new Vector(0, 0); this.onResize = this.onResize.bind(this); this.onPointerMove = this.onPointerMove.bind(this); // document.addEventListener('application-pointermove', this.onPointerMove, false); window.addEventListener('resize', this.onResize); this.onResize(); } render(application) { this.helpers.forEach((helper)=> { helper.render(application); }) } preDraw() {} postDraw() {} solveForPosition(v) { if(!v instanceof Vector) return v = v.clone(); v.x -= window.innerWidth / 2; v.y -= window.innerHeight / 2; let scale = this.scale; let amp = this.amplitude; // let waveform = new Vector(Math.cos(v.x / scale) * amp, Math.sin(v.y / scale) * amp); // return new Vector(waveform.y - waveform.x, -waveform.x - waveform.y); let envelope = this.amplitude; let noise = this.noise.noise(v.x / scale, v.y / scale, this.z) * scale; if(noise > envelope) noise = envelope; if(noise < -envelope) noise = -envelope; let noise1 = this.noise.noise(v.y / scale, v.x / scale, this.z / scale); let transV = new Vector(1, 0); transV.length = noise; transV.angle = noise1 * 10; return transV; let transv = v.subtractNew(this.mousepos); transv = new Vector(transv.y - transv.x, -transv.x - transv.y); transv.length *= 0.03; if(transv.length > 50) { transv.length = 50; } transv.length -= 50; transv.length *= -1; return transv; } onPointerMove(e) { this.mousepos = e.detail.pointer; this.helpers.forEach((helper)=> { helper.vector = this.solveForPosition(helper.position); }); } onResize(e) { if(!this.debug) return; this.helpers.forEach((helper)=> { helper.destroy(); }) this.helpers = []; let w = this.sampleWidth; let curpos = new Vector(0, 0); while(curpos.y < window.innerHeight + w) { curpos.x = 0; while(curpos.x < window.innerWidth + w) { this.helpers.push(new Arrow(curpos.x, curpos.y, 10, 10, this.solveForPosition(curpos))) curpos.x += w; } curpos.y += w; } } set scale(value) { if(value > 0) { this._scale = value; } } get scale() { return this._scale || 500; } set amplitude(value) { if(value > 0) { this._amplitude = value; } } get amplitude() { return this._amplitude || 10; } set sampleWidth(value) { if(value > 0) this._sampleWidth = value; } get sampleWidth() { return this._sampleWidth || 30; } set z(value) { if(value > 0) this._z = value; } get z() { return this._z || 30; } set mousepos(value) { if(value instanceof Vector) this._mousepos = value; } get mousepos() { return this._mousepos || new Vector(0,0); } set debug(value) { this._debug = value === true; } get debug() { return this._debug === true; } get strokeStyle() { return 'black'; } get strokeWidth() { return 0; } } class Tracer extends Actor { constructor(x = 200, y = 200, w = 40, h = 20) { super(x, y, w, h); this.onAnimate = this.onAnimate.bind(this); document.addEventListener('application-animate', this.onAnimate, false); this.friction = 0.95; this.momentum = new Vector(1,0); } onAnimate(e) { let force = this.field.solveForPosition(this.position).multiplyScalar(0.01); let app = e.detail.application; let oldPosition = this.position.clone(); let draw = true; this.momentum.add(force); this.momentum.multiplyScalar(this.friction); if(this.momentum.length < 1) this.momentum.length = 1; if(this.momentum.length > 20) this.momentum.length = 20; this.position.add(this.momentum); if(this.position.x < -this.dimensions.width) { this.position.x = app.dimensions.width + this.dimensions.width; draw = false; } else if(this.position.x > app.dimensions.width + this.dimensions.width) { this.position.x = -this.dimensions.width; draw = false; } if(this.position.y < -this.dimensions.height) { this.position.y = app.dimensions.height + this.dimensions.height; draw = false; } else if(this.position.y > app.dimensions.height + this.dimensions.height) { this.position.y = -this.dimensions.height; draw = false; } if(draw) { let context = app.context; let opacity = Math.abs( (this.momentum.length - 10) / 20 ); // console.log(opacity, this.momentum.length); // console.log(oldPosition, this.position); context.beginPath(); context.lineWidth = this.momentum.length * 2; context.strokeStyle = 'RGBA(0,0,0,0.2)'; context.moveTo(oldPosition.x, oldPosition.y); context.lineTo(this.position.x, this.position.y); context.stroke(); context.beginPath(); context.lineWidth = this.momentum.length; context.strokeStyle = this.colour; context.moveTo(oldPosition.x, oldPosition.y); context.lineTo(this.position.x, this.position.y); context.stroke(); } } set colour(value) { this._colour = value; } get colour() { return this._colour || 'RGBA(255,255,255,0.5)'; } } class BranchTracer extends Tracer { constructor(x = 200, y = 200, w = 40, h = 20) { super(x, y, w, h); this.originalPosition = new Vector(x, y); this.openTimer = 0.; this.dieTimer = .5; this.openRadius = 5. + Math.random() * 10.; this.startLife = Date.now(); this.lifeTime = 1000 + Math.random() * 15000; this.dying = false; this.dead = false; } drawDeath(app) { let context = app.context; // if(this.dieTimer == .5) { // context.beginPath(); // context.moveTo(this.deadPosition.x, this.deadPosition.y); // context.fillStyle = `rgba(20,20,20,.1)`; // context.arc(this.deadPosition.x, this.deadPosition.y, this.openRadius * 10., 0, 2 * Math.PI); // context.fill(); // } context.beginPath(); context.moveTo(this.deadPosition.x, this.deadPosition.y); context.fillStyle = `rgba(50,${(this.dieTimer * 2.)},${(this.dieTimer * 2.)},${this.dieTimer/200.})`; context.arc(this.deadPosition.x, this.deadPosition.y, (this.openRadius*2.) / 100 * (100. - this.dieTimer), 0, 2 * Math.PI); context.fill(); this.dieTimer += (100 - this.dieTimer) * .05; } onAnimate(e) { let app = e.detail.application; let context = app.context; if(this.dying) { if(this.dieTimer < 99.) { this.drawDeath(app); } else { this.dead = true; } return; } super.onAnimate(e); if(e.detail.now - this.startLife > this.lifeTime && !this.initial) { this.dying = true; this.deadPosition = this.position; } // console.log(e.detail.now) if(this.openTimer < 100.) { context.moveTo(this.originalPosition.x, this.originalPosition.y); context.fillStyle = 'rgba(0,0,0,.1)'; context.arc(this.originalPosition.x, this.originalPosition.y, this.openRadius / 100 * (this.openTimer+10), 0, 2 * Math.PI); context.fill(); context.beginPath(); context.fillStyle = 'rgba(255,255,255,.4)'; context.arc(this.originalPosition.x, this.originalPosition.y, this.openRadius / 100 * this.openTimer, 0, 2 * Math.PI); context.fill(); this.openTimer += 5.; } if(Math.random() * 100 < this.branchChance) { this.onBranch(this.position); } } set onBranch(value) { if(typeof value == 'function') this._onBranch = value.bind(this); } get onBranch() { return this._onBranch || function() { } } set branchChance(value) { if(value > 0 && value <= 100) this._branchChance = value; } get branchChance() { return this._branchChance || 0.2; } } class Noise { constructor(r) { if (r == undefined) r = Math; this.grad3 = [[1,1,0],[-1,1,0],[1,-1,0],[-1,-1,0], [1,0,1],[-1,0,1],[1,0,-1],[-1,0,-1], [0,1,1],[0,-1,1],[0,1,-1],[0,-1,-1]]; this.p = []; for (var i=0; i<256; i++) { this.p[i] = Math.floor(r.random()*256); } // To remove the need for index wrapping, double the permutation table length this.perm = []; for(var i=0; i<512; i++) { this.perm[i]=this.p[i & 255]; } } dot(g, x, y, z) { return g[0]*x + g[1]*y + g[2]*z; } mix(a, b, t) { return (1.0-t)*a + t*b; } fade(t) { return t*t*t*(t*(t*6.0-15.0)+10.0); } noise(x, y, z) { // Find unit grid cell containing point var X = Math.floor(x); var Y = Math.floor(y); var Z = Math.floor(z); // Get relative xyz coordinates of point within that cell x = x - X; y = y - Y; z = z - Z; // Wrap the integer cells at 255 (smaller integer period can be introduced here) X = X & 255; Y = Y & 255; Z = Z & 255; // Calculate a set of eight hashed gradient indices var gi000 = this.perm[X+this.perm[Y+this.perm[Z]]] % 12; var gi001 = this.perm[X+this.perm[Y+this.perm[Z+1]]] % 12; var gi010 = this.perm[X+this.perm[Y+1+this.perm[Z]]] % 12; var gi011 = this.perm[X+this.perm[Y+1+this.perm[Z+1]]] % 12; var gi100 = this.perm[X+1+this.perm[Y+this.perm[Z]]] % 12; var gi101 = this.perm[X+1+this.perm[Y+this.perm[Z+1]]] % 12; var gi110 = this.perm[X+1+this.perm[Y+1+this.perm[Z]]] % 12; var gi111 = this.perm[X+1+this.perm[Y+1+this.perm[Z+1]]] % 12; // The gradients of each corner are now: // g000 = grad3[gi000]; // g001 = grad3[gi001]; // g010 = grad3[gi010]; // g011 = grad3[gi011]; // g100 = grad3[gi100]; // g101 = grad3[gi101]; // g110 = grad3[gi110]; // g111 = grad3[gi111]; // Calculate noise contributions from each of the eight corners var n000= this.dot(this.grad3[gi000], x, y, z); var n100= this.dot(this.grad3[gi100], x-1, y, z); var n010= this.dot(this.grad3[gi010], x, y-1, z); var n110= this.dot(this.grad3[gi110], x-1, y-1, z); var n001= this.dot(this.grad3[gi001], x, y, z-1); var n101= this.dot(this.grad3[gi101], x-1, y, z-1); var n011= this.dot(this.grad3[gi011], x, y-1, z-1); var n111= this.dot(this.grad3[gi111], x-1, y-1, z-1); // Compute the fade curve value for each of x, y, z var u = this.fade(x); var v = this.fade(y); var w = this.fade(z); // Interpolate along x the contributions from each of the corners var nx00 = this.mix(n000, n100, u); var nx01 = this.mix(n001, n101, u); var nx10 = this.mix(n010, n110, u); var nx11 = this.mix(n011, n111, u); // Interpolate the four results along y var nxy0 = this.mix(nx00, nx10, v); var nxy1 = this.mix(nx01, nx11, v); // Interpolate the two last results along z var nxyz = this.mix(nxy0, nxy1, w); return nxyz; } } const conversionFactor = 180 / Math.PI; let radianToDegrees = function(radian) { return radian * conversionFactor; } let degreesToRadian = function(degrees) { return degrees / conversionFactor; } // Taken from https://github.com/wethegit/wtc-vector /** * A basic 2D Vector class that provides simple algebraic functionality in the form * of 2D Vectors. * * We use Getters/setters for both principle properties (x & y) as well as virtual * properties (rotation, length etc.). * * @class Vector * @author Liam Egan * @version 0.1.1 * @created Dec 19, 2016 */ class Vector { /** * The Vector Class constructor * * @constructor * @param {number} x The x coord * @param {number} y The y coord */ constructor(x, y){ this.x = x; this.y = y; } /** * Resets the vector coordinates * * @public * @param {number} x The x coord * @param {number} y The y coord */ reset(x, y) { this.x = x; this.y = y; } /** * Clones the vector * * @public * @return {Vector} The cloned vector */ clone() { return new Vector(this.x, this.y); } /** * Adds one vector to another. * * @public * @chainable * @param {Vector} vector The vector to add to this one * @return {Vector} Returns itself, modified */ add(vector) { this.x += vector.x; this.y += vector.y; return this; } /** * Clones the vector and adds the vector to it instead * * @public * @chainable * @param {Vector} vector The vector to add to this one * @return {Vector} Returns the clone of itself, modified */ addNew(vector) { let v = this.clone(); return v.add(vector); } /** * Adds a scalar to the vector, modifying both the x and y * * @public * @chainable * @param {number} scalar The scalar to add to the vector * @return {Vector} Returns itself, modified */ addScalar(scalar) { return this.add(new Vector(scalar, scalar)); } /** * Clones the vector and adds the scalar to it instead * * @public * @chainable * @param {number} scalar The scalar to add to the vector * @return {Vector} Returns the clone of itself, modified */ addScalarNew(scalar) { let v = this.clone(); return v.addScalar(scalar); } /** * Subtracts one vector from another. * * @public * @chainable * @param {Vector} vector The vector to subtract from this one * @return {Vector} Returns itself, modified */ subtract(vector) { this.x -= vector.x; this.y -= vector.y; return this; } /** * Clones the vector and subtracts the vector from it instead * * @public * @chainable * @param {Vector} vector The vector to subtract from this one * @return {Vector} Returns the clone of itself, modified */ subtractNew(vector) { let v = this.clone(); return v.subtract(vector); } /** * Subtracts a scalar from the vector, modifying both the x and y * * @public * @chainable * @param {number} scalar The scalar to subtract from the vector * @return {Vector} Returns itself, modified */ subtractScalar(scalar) { return this.subtract(new Vector(scalar, scalar)); } /** * Clones the vector and subtracts the scalar from it instead * * @public * @chainable * @param {number} scalar The scalar to add to the vector * @return {Vector} Returns the clone of itself, modified */ subtractScalarNew(scalar) { let v = this.clone(); return v.subtractScalar(scalar); } /** * Divides one vector by another. * * @public * @chainable * @param {Vector} vector The vector to divide this by * @return {Vector} Returns itself, modified */ divide(vector) { if(vector.x !== 0) { this.x /= vector.x } else { this.x = 0; } if(vector.y !== 0) { this.y /= vector.y } else { this.y = 0; } return this; } /** * Clones the vector and divides it by the vector instead * * @public * @chainable * @param {Vector} vector The vector to divide the clone by * @return {Vector} Returns the clone of itself, modified */ divideNew(vector) { let v = this.clone(); return v.divide(vector); } /** * Divides the vector by a scalar. * * @public * @chainable * @param {number} scalar The scalar to divide both x and y by * @return {Vector} Returns itself, modified */ divideScalar(scalar) { var v = new Vector(scalar, scalar); return this.divide(v); } /** * Clones the vector and divides it by the provided scalar. * * @public * @chainable * @param {number} scalar The scalar to divide both x and y by * @return {Vector} Returns the clone of itself, modified */ divideScalarNew(scalar) { let v = this.clone(); return v.divideScalar(scalar); } /** * Multiplies one vector by another. * * @public * @chainable * @param {Vector} vector The vector to multiply this by * @return {Vector} Returns itself, modified */ multiply(vector) { this.x *= vector.x; this.y *= vector.y; return this; } /** * Clones the vector and multiplies it by the vector instead * * @public * @chainable * @param {Vector} vector The vector to multiply the clone by * @return {Vector} Returns the clone of itself, modified */ multiplyNew(vector) { let v = this.clone(); return v.multiply(vector); } /** * Multiplies the vector by a scalar. * * @public * @chainable * @param {number} scalar The scalar to multiply both x and y by * @return {Vector} Returns itself, modified */ multiplyScalar(scalar) { var v = new Vector(scalar, scalar); return this.multiply(v); } /** * Clones the vector and multiplies it by the provided scalar. * * @public * @chainable * @param {number} scalar The scalar to multiply both x and y by * @return {Vector} Returns the clone of itself, modified */ multiplyScalarNew(scalar) { let v = this.clone(); return v.multiplyScalar(scalar); } /** * Alias of {@link Vector#multiplyScalar__anchor multiplyScalar} */ scale(scalar) { return this.multiplyScalar(scalar); } /** * Alias of {@link Vector#multiplyScalarNew__anchor multiplyScalarNew} */ scaleNew(scalar) { return this.multiplyScalarNew(scalar); } /** * Rotates a vecor by a given amount, provided in radians. * * @public * @chainable * @param {number} radian The angle, in radians, to rotate the vector by * @return {Vector} Returns itself, modified */ rotate(radian) { var x = (this.x * Math.cos(radian)) - (this.y * Math.sin(radian)); var y = (this.x * Math.sin(radian)) + (this.y * Math.cos(radian)); this.x = x; this.y = y; return this; } /** * Clones the vector and rotates it by the supplied radian value * * @public * @chainable * @param {number} radian The angle, in radians, to rotate the vector by * @return {Vector} Returns the clone of itself, modified */ rotateNew(radian) { let v = this.clone(); return v.rotate(radian); } /** * Rotates a vecor by a given amount, provided in degrees. Converts the degree * value to radians and runs the rotaet method. * * @public * @chainable * @param {number} degrees The angle, in degrees, to rotate the vector by * @return {Vector} Returns itself, modified */ rotateDeg(degrees) { return this.rotate(degreesToRadian(degrees)); } /** * Clones the vector and rotates it by the supplied degree value * * @public * @chainable * @param {number} degrees The angle, in degrees, to rotate the vector by * @return {Vector} Returns the clone of itself, modified */ rotateDegNew(degrees) { return this.rotateNew(degreesToRadian(degrees)); } /** * Alias of {@link Vector#rotate__anchor rotate} */ rotateBy(radian) { return this.rotate(radian); } /** * Alias of {@link Vector#rotateNew__anchor rotateNew} */ rotateByNew(radian) { return this.rotateNew(radian); } /** * Alias of {@link Vector#rotateDeg__anchor rotateDeg} */ rotateDegBy(degrees) { return this.rotateDeg(degrees); } /** * Alias of {@link Vector#rotateDegNew__anchor rotateDegNew} */ rotateDegByNew(radian) { return tjos.rotateDegNew(radian); } /** * Rotates a vector to a specific angle * * @public * @chainable * @param {number} radian The angle, in radians, to rotate the vector to * @return {Vector} Returns itself, modified */ rotateTo(radian) { return this.rotate(radian-this.angle); }; /** * Clones the vector and rotates it to the supplied radian value * * @public * @chainable * @param {number} radian The angle, in radians, to rotate the vector to * @return {Vector} Returns the clone of itself, modified */ rotateToNew(radian) { let v = this.clone(); return v.rotateTo(radian); }; /** * Rotates a vecor to a given amount, provided in degrees. Converts the degree * value to radians and runs the rotateTo method. * * @public * @chainable * @param {number} degrees The angle, in degrees, to rotate the vector to * @return {Vector} Returns itself, modified */ rotateToDeg(degrees) { return this.rotateTo(degreesToRadian(degrees)); } /** * Clones the vector and rotates it to the supplied degree value * * @public * @chainable * @param {number} degrees The angle, in degrees, to rotate the vector to * @return {Vector} Returns the clone of itself, modified */ rotateToDegNew(degrees) { return this.rotateToNew(degreesToRadian(degrees)); } /** * Normalises the vector down to a length of 1 unit * * @public * @chainable * @return {Vector} Returns itself, modified */ normalise() { return this.divideScalar(this.length); } /** * Clones the vector and normalises it * * @public * @chainable * @return {Vector} Returns a clone of itself, modified */ normaliseNew() { return this.divideScalarNew(this.length); } /** * Calculates the distance between this and the supplied vector * * @param {Vector} vector The vector to calculate the distance from * @return {number} The distance between this and the supplied vector */ distance(vector) { return this.subtractNew(vector).length; } /** * Calculates the distance on the X axis between this and the supplied vector * * @param {Vector} vector The vector to calculate the distance from * @return {number} The distance, along the x axis, between this and the supplied vector */ distanceX(vector) { return this.x - vector.x; } /** * Calculated the distance on the Y axis between this and the supplied vector * * @param {Vector} vector The vector to calculate the distance from * @return {number} The distance, along the y axis, between this and the supplied vector */ distanceY(vector) { return this.y - vector.y; } /** * Calculates the dot product between this and a supplied vector * * @example * // returns -14 * new Vector(2, -3).dot(new Vector(-4, 2)) * new Vector(-4, 2).dot(new Vector(2, -3)) * new Vector(2, -4).dot(new Vector(-3, 2)) * * @param {Vector} vector The vector object against which to calculate the dot product * @return {number} The dot product of the two vectors */ dot(vector) { return (this.x * vector.x) + (this.y * vector.y); } /** * Calculates the cross product between this and the supplied vector. * * @example * // returns -2 * new Vector(2, -3).cross(new Vector(-4, 2)) * new Vector(-4, 2).cross(new Vector(2, -3)) * // returns 2 * new Vector(2, -4).cross(new Vector(-3, 2)) * * @param {Vector} vector The vector object against which to calculate the cross product * @return {number} The cross product of the two vectors */ cross(vector) { return (this.x * vector.x) - (this.y * vector.y); } /** * Getters and setters */ /** * (getter/setter) The x value of the vector. * * @type {number} * @default 0 */ set x(x) { if(typeof x == 'number') { this._x = x; } else { throw new TypeError('X should be a number'); } } get x() { return this._x || 0; } /** * (getter/setter) The y value of the vector. * * @type {number} * @default 0 */ set y(y) { if(typeof y == 'number') { this._y = y; } else { throw new TypeError('Y should be a number'); } } get y() { return this._y || 0; } /** * (getter/setter) The length of the vector presented as a square. If you're using * length for comparison, this is quicker. * * @type {number} * @default 0 */ set lengthSquared(length) { var factor; if(typeof length == 'number') { factor = length / this.lengthSquared; this.multiplyScalar(factor); } else { throw new TypeError('length should be a number'); } } get lengthSquared() { return (this.x * this.x) + (this.y * this.y); } /** * (getter/setter) The length of the vector * * @type {number} * @default 0 */ set length(length) { var factor; if(typeof length == 'number') { factor = length / this.length; this.multiplyScalar(factor); } else { throw new TypeError('length should be a number'); } } get length() { return Math.sqrt(this.lengthSquared); } /** * (getter/setter) The angle of the vector, in radians * * @type {number} * @default 0 */ set angle(radian) { if(typeof radian == 'number') { this.rotateTo(radian); } else { throw new TypeError('angle should be a number'); } } get angle() { return Math.atan2(this.y, this.x); } /** * (getter/setter) The angle of the vector, in radians * * @type {number} * @default 0 */ set angleInDegrees(degrees) { if(typeof degrees == 'number') { this.rotateToDeg(degrees); } else { throw new TypeError('angle should be a number'); } } get angleInDegrees() { return radianToDegrees(Math.atan2(this.y, this.x)); } /** * (getter/setter) Vector width. * Alias of {@link Vector#x x} * * @type {number} */ set width(w) { this.x = w; } get width() { return this.x; } /** * (getter/setter) Vector height. * Alias of {@link Vector#x x} * * @type {number} */ set height(h) { this.y = h; } get height() { return this.y; } /** * (getter/setter) Vector area. * @readonly * * @type {number} */ get area() { return this.x * this.y; } } initialise();

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