Gravity points
This commit is contained in:
Greg Shuflin
parent
9df26660b6
commit
4e718461bc
532
src/gravity-points/app.js
Normal file
532
src/gravity-points/app.js
Normal file
@ -0,0 +1,532 @@
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/**
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* requestAnimationFrame
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*/
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window.requestAnimationFrame = (function(){
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return window.requestAnimationFrame ||
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window.webkitRequestAnimationFrame ||
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window.mozRequestAnimationFrame ||
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window.oRequestAnimationFrame ||
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window.msRequestAnimationFrame ||
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function (callback) {
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window.setTimeout(callback, 1000 / 60);
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};
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})();
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/**
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* Vector
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*/
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function Vector(x, y) {
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this.x = x || 0;
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this.y = y || 0;
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}
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Vector.add = function(a, b) {
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return new Vector(a.x + b.x, a.y + b.y);
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};
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Vector.sub = function(a, b) {
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return new Vector(a.x - b.x, a.y - b.y);
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};
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Vector.scale = function(v, s) {
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return v.clone().scale(s);
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};
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Vector.random = function() {
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return new Vector(
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Math.random() * 2 - 1,
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Math.random() * 2 - 1
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);
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};
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Vector.prototype = {
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set: function(x, y) {
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if (typeof x === 'object') {
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y = x.y;
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x = x.x;
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}
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this.x = x || 0;
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this.y = y || 0;
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return this;
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},
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add: function(v) {
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this.x += v.x;
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this.y += v.y;
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return this;
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},
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sub: function(v) {
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this.x -= v.x;
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this.y -= v.y;
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return this;
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},
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scale: function(s) {
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this.x *= s;
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this.y *= s;
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return this;
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},
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length: function() {
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return Math.sqrt(this.x * this.x + this.y * this.y);
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},
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lengthSq: function() {
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return this.x * this.x + this.y * this.y;
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},
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normalize: function() {
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var m = Math.sqrt(this.x * this.x + this.y * this.y);
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if (m) {
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this.x /= m;
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this.y /= m;
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}
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return this;
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},
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angle: function() {
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return Math.atan2(this.y, this.x);
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},
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angleTo: function(v) {
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var dx = v.x - this.x,
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dy = v.y - this.y;
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return Math.atan2(dy, dx);
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},
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distanceTo: function(v) {
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var dx = v.x - this.x,
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dy = v.y - this.y;
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return Math.sqrt(dx * dx + dy * dy);
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},
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distanceToSq: function(v) {
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var dx = v.x - this.x,
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dy = v.y - this.y;
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return dx * dx + dy * dy;
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},
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lerp: function(v, t) {
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this.x += (v.x - this.x) * t;
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this.y += (v.y - this.y) * t;
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return this;
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},
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clone: function() {
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return new Vector(this.x, this.y);
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},
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toString: function() {
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return '(x:' + this.x + ', y:' + this.y + ')';
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}
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};
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/**
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* GravityPoint
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*/
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function GravityPoint(x, y, radius, targets) {
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Vector.call(this, x, y);
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this.radius = radius;
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this.currentRadius = radius * 0.5;
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this._targets = {
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particles: targets.particles || [],
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gravities: targets.gravities || []
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};
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this._speed = new Vector();
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}
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GravityPoint.RADIUS_LIMIT = 65;
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GravityPoint.interferenceToPoint = true;
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GravityPoint.prototype = (function(o) {
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var s = new Vector(0, 0), p;
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for (p in o) s[p] = o[p];
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return s;
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})({
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gravity: 0.05,
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isMouseOver: false,
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dragging: false,
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destroyed: false,
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_easeRadius: 0,
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_dragDistance: null,
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_collapsing: false,
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hitTest: function(p) {
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return this.distanceTo(p) < this.radius;
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},
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startDrag: function(dragStartPoint) {
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this._dragDistance = Vector.sub(dragStartPoint, this);
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this.dragging = true;
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},
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drag: function(dragToPoint) {
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this.x = dragToPoint.x - this._dragDistance.x;
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this.y = dragToPoint.y - this._dragDistance.y;
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},
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endDrag: function() {
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this._dragDistance = null;
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this.dragging = false;
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},
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addSpeed: function(d) {
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this._speed = this._speed.add(d);
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},
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collapse: function(e) {
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this.currentRadius *= 1.75;
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this._collapsing = true;
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},
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render: function(ctx) {
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if (this.destroyed) return;
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var particles = this._targets.particles,
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i, len;
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for (i = 0, len = particles.length; i < len; i++) {
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particles[i].addSpeed(Vector.sub(this, particles[i]).normalize().scale(this.gravity));
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}
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this._easeRadius = (this._easeRadius + (this.radius - this.currentRadius) * 0.07) * 0.95;
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this.currentRadius += this._easeRadius;
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if (this.currentRadius < 0) this.currentRadius = 0;
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if (this._collapsing) {
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this.radius *= 0.75;
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if (this.currentRadius < 1) this.destroyed = true;
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this._draw(ctx);
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return;
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}
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var gravities = this._targets.gravities,
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g, absorp,
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area = this.radius * this.radius * Math.PI, garea;
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for (i = 0, len = gravities.length; i < len; i++) {
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g = gravities[i];
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if (g === this || g.destroyed) continue;
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if (
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(this.currentRadius >= g.radius || this.dragging) &&
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this.distanceTo(g) < (this.currentRadius + g.radius) * 0.85
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) {
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g.destroyed = true;
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this.gravity += g.gravity;
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absorp = Vector.sub(g, this).scale(g.radius / this.radius * 0.5);
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this.addSpeed(absorp);
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garea = g.radius * g.radius * Math.PI;
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this.currentRadius = Math.sqrt((area + garea * 3) / Math.PI);
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this.radius = Math.sqrt((area + garea) / Math.PI);
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}
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g.addSpeed(Vector.sub(this, g).normalize().scale(this.gravity));
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}
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if (GravityPoint.interferenceToPoint && !this.dragging)
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this.add(this._speed);
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this._speed = new Vector();
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if (this.currentRadius > GravityPoint.RADIUS_LIMIT) this.collapse();
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this._draw(ctx);
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},
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_draw: function(ctx) {
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var grd, r;
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ctx.save();
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grd = ctx.createRadialGradient(this.x, this.y, this.radius, this.x, this.y, this.radius * 5);
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grd.addColorStop(0, 'rgba(0, 0, 0, 0.1)');
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grd.addColorStop(1, 'rgba(0, 0, 0, 0)');
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ctx.beginPath();
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ctx.arc(this.x, this.y, this.radius * 5, 0, Math.PI * 2, false);
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ctx.fillStyle = grd;
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ctx.fill();
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r = Math.random() * this.currentRadius * 0.7 + this.currentRadius * 0.3;
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grd = ctx.createRadialGradient(this.x, this.y, r, this.x, this.y, this.currentRadius);
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grd.addColorStop(0, 'rgba(0, 0, 0, 1)');
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grd.addColorStop(1, Math.random() < 0.2 ? 'rgba(255, 196, 0, 0.15)' : 'rgba(103, 181, 191, 0.75)');
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ctx.beginPath();
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ctx.arc(this.x, this.y, this.currentRadius, 0, Math.PI * 2, false);
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ctx.fillStyle = grd;
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ctx.fill();
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ctx.restore();
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}
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});
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/**
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* Particle
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*/
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function Particle(x, y, radius) {
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Vector.call(this, x, y);
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this.radius = radius;
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this._latest = new Vector();
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this._speed = new Vector();
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}
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Particle.prototype = (function(o) {
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var s = new Vector(0, 0), p;
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for (p in o) s[p] = o[p];
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return s;
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})({
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addSpeed: function(d) {
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this._speed.add(d);
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},
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update: function() {
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if (this._speed.length() > 12) this._speed.normalize().scale(12);
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this._latest.set(this);
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this.add(this._speed);
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}
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// render: function(ctx) {
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// if (this._speed.length() > 12) this._speed.normalize().scale(12);
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// this._latest.set(this);
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// this.add(this._speed);
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// ctx.save();
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// ctx.fillStyle = ctx.strokeStyle = '#fff';
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// ctx.lineCap = ctx.lineJoin = 'round';
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// ctx.lineWidth = this.radius * 2;
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// ctx.beginPath();
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// ctx.moveTo(this.x, this.y);
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// ctx.lineTo(this._latest.x, this._latest.y);
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// ctx.stroke();
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// ctx.beginPath();
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// ctx.arc(this.x, this.y, this.radius, 0, Math.PI * 2, false);
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// ctx.fill();
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// ctx.restore();
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// }
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});
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// Initialize
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(function() {
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// Configs
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var BACKGROUND_COLOR = 'rgba(11, 51, 56, 1)',
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PARTICLE_RADIUS = 1,
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G_POINT_RADIUS = 10,
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G_POINT_RADIUS_LIMITS = 65;
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// Vars
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var canvas, context,
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bufferCvs, bufferCtx,
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screenWidth, screenHeight,
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mouse = new Vector(),
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gravities = [],
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particles = [],
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grad,
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gui, control;
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// Event Listeners
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function resize(e) {
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screenWidth = canvas.width = window.innerWidth;
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screenHeight = canvas.height = window.innerHeight;
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bufferCvs.width = screenWidth;
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bufferCvs.height = screenHeight;
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context = canvas.getContext('2d');
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bufferCtx = bufferCvs.getContext('2d');
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var cx = canvas.width * 0.5,
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cy = canvas.height * 0.5;
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grad = context.createRadialGradient(cx, cy, 0, cx, cy, Math.sqrt(cx * cx + cy * cy));
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grad.addColorStop(0, 'rgba(0, 0, 0, 0)');
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grad.addColorStop(1, 'rgba(0, 0, 0, 0.35)');
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}
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function mouseMove(e) {
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mouse.set(e.clientX, e.clientY);
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var i, g, hit = false;
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for (i = gravities.length - 1; i >= 0; i--) {
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g = gravities[i];
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if ((!hit && g.hitTest(mouse)) || g.dragging)
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g.isMouseOver = hit = true;
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else
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g.isMouseOver = false;
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}
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canvas.style.cursor = hit ? 'pointer' : 'default';
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}
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function mouseDown(e) {
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for (var i = gravities.length - 1; i >= 0; i--) {
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if (gravities[i].isMouseOver) {
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gravities[i].startDrag(mouse);
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return;
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}
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}
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gravities.push(new GravityPoint(e.clientX, e.clientY, G_POINT_RADIUS, {
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particles: particles,
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gravities: gravities
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}));
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}
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function mouseUp(e) {
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for (var i = 0, len = gravities.length; i < len; i++) {
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if (gravities[i].dragging) {
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gravities[i].endDrag();
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break;
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}
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}
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}
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function doubleClick(e) {
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for (var i = gravities.length - 1; i >= 0; i--) {
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if (gravities[i].isMouseOver) {
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gravities[i].collapse();
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break;
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}
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}
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}
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// Functions
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function addParticle(num) {
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var i, p;
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for (i = 0; i < num; i++) {
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p = new Particle(
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Math.floor(Math.random() * screenWidth - PARTICLE_RADIUS * 2) + 1 + PARTICLE_RADIUS,
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Math.floor(Math.random() * screenHeight - PARTICLE_RADIUS * 2) + 1 + PARTICLE_RADIUS,
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PARTICLE_RADIUS
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);
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p.addSpeed(Vector.random());
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particles.push(p);
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}
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}
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function removeParticle(num) {
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if (particles.length < num) num = particles.length;
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for (var i = 0; i < num; i++) {
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particles.pop();
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}
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}
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// GUI Control
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control = {
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particleNum: 100
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};
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// Init
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canvas = document.getElementById('c');
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bufferCvs = document.createElement('canvas');
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window.addEventListener('resize', resize, false);
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resize(null);
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addParticle(control.particleNum);
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canvas.addEventListener('mousemove', mouseMove, false);
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canvas.addEventListener('mousedown', mouseDown, false);
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canvas.addEventListener('mouseup', mouseUp, false);
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canvas.addEventListener('dblclick', doubleClick, false);
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// GUI
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gui = new dat.GUI();
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gui.add(control, 'particleNum', 0, 500).step(1).name('Particle Num').onChange(function() {
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var n = (control.particleNum | 0) - particles.length;
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if (n > 0)
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addParticle(n);
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else if (n < 0)
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removeParticle(-n);
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});
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gui.add(GravityPoint, 'interferenceToPoint').name('Interference Between Point');
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gui.close();
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// Start Update
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var loop = function() {
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var i, len, g, p;
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context.save();
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context.fillStyle = BACKGROUND_COLOR;
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context.fillRect(0, 0, screenWidth, screenHeight);
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context.fillStyle = grad;
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context.fillRect(0, 0, screenWidth, screenHeight);
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context.restore();
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for (i = 0, len = gravities.length; i < len; i++) {
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g = gravities[i];
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if (g.dragging) g.drag(mouse);
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g.render(context);
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if (g.destroyed) {
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gravities.splice(i, 1);
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len--;
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i--;
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}
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}
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bufferCtx.save();
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bufferCtx.globalCompositeOperation = 'destination-out';
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bufferCtx.globalAlpha = 0.35;
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bufferCtx.fillRect(0, 0, screenWidth, screenHeight);
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bufferCtx.restore();
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// パーティクルをバッファに描画
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// for (i = 0, len = particles.length; i < len; i++) {
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// particles[i].render(bufferCtx);
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// }
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len = particles.length;
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bufferCtx.save();
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bufferCtx.fillStyle = bufferCtx.strokeStyle = '#fff';
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bufferCtx.lineCap = bufferCtx.lineJoin = 'round';
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bufferCtx.lineWidth = PARTICLE_RADIUS * 2;
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bufferCtx.beginPath();
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for (i = 0; i < len; i++) {
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p = particles[i];
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p.update();
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bufferCtx.moveTo(p.x, p.y);
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bufferCtx.lineTo(p._latest.x, p._latest.y);
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}
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bufferCtx.stroke();
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bufferCtx.beginPath();
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for (i = 0; i < len; i++) {
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p = particles[i];
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bufferCtx.moveTo(p.x, p.y);
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bufferCtx.arc(p.x, p.y, p.radius, 0, Math.PI * 2, false);
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}
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bufferCtx.fill();
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bufferCtx.restore();
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|
||||
// バッファをキャンバスに描画
|
||||
context.drawImage(bufferCvs, 0, 0);
|
||||
|
||||
requestAnimationFrame(loop);
|
||||
};
|
||||
loop();
|
||||
|
||||
})();
|
||||
|
||||
15
src/gravity-points/index.html
Normal file
15
src/gravity-points/index.html
Normal file
@ -0,0 +1,15 @@
|
||||
<!DOCTYPE html>
|
||||
<html>
|
||||
<head>
|
||||
<meta charset="utf-8"/>
|
||||
<title>Fizzy Sparks</title>
|
||||
<link href="style.css" rel="stylesheet" />
|
||||
<script src="https://cdnjs.cloudflare.com/ajax/libs/dat-gui/0.5/dat.gui.min.js"></script>
|
||||
<script type="module" src="app.js"></script>
|
||||
</head>
|
||||
<body>
|
||||
<canvas id="c"></canvas>
|
||||
<div class="info">Click to add gravity point.</div>
|
||||
</body>
|
||||
</html>
|
||||
|
||||
28
src/gravity-points/style.css
Normal file
28
src/gravity-points/style.css
Normal file
@ -0,0 +1,28 @@
|
||||
body {
|
||||
font-family: Helvetica sans-serif;
|
||||
padding: 0;
|
||||
margin: 0;
|
||||
background-color: #222;
|
||||
overflow: hidden;
|
||||
-webkit-user-select: none;
|
||||
-moz-user-select: none;
|
||||
-o-user-select: none;
|
||||
-ms-user-select: none;
|
||||
user-select: none;
|
||||
}
|
||||
|
||||
canvas {
|
||||
position: absolute;
|
||||
top: 0;
|
||||
left: 0;
|
||||
}
|
||||
|
||||
.info {
|
||||
position: absolute;
|
||||
top: 0;
|
||||
left: 0;
|
||||
padding: 5px 15px;
|
||||
color: #eee;
|
||||
font-size: 13px;
|
||||
background-color: rgba(0, 0, 0, .5);
|
||||
}
|
||||
@ -15,6 +15,7 @@
|
||||
<li> <a href="./orbital-trails/index.html">Orbital Trails (mine)</a>
|
||||
<li> <a href="./bokeh/index.html">Bokeh effect (their)</a>
|
||||
<li> <a href="./sparks/index.html">Sparks (theirs)</a>
|
||||
<li> <a href="./gravity-points/index.html">Gravity Points (theirs)</a>
|
||||
</ul>
|
||||
</body>
|
||||
</html>
|
||||
|
||||
Loading…
Reference in New Issue
Block a user