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1a2ec17275
...
4e718461bc
@ -9,7 +9,6 @@
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"parcel": "^2.9.3"
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},
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"dependencies": {
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"konva": "^9.2.1",
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"victor": "^1.1.0"
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"konva": "^9.2.1"
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}
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}
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@ -8,9 +8,6 @@ dependencies:
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konva:
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specifier: ^9.2.1
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version: 9.2.1
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victor:
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specifier: ^1.1.0
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version: 1.1.0
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devDependencies:
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parcel:
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@ -1878,10 +1875,6 @@ packages:
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engines: {node: '>= 4'}
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dev: true
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/victor@1.1.0:
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resolution: {integrity: sha512-s+EQHqIs5TNgLa3HHPr8oCpWFulQZzDX/PLaskVDeWXqEW12l54H5XD+cZ3gXrgvdOscqEcdAMXgEUZlJckQ4w==}
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dev: false
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/weak-lru-cache@1.2.2:
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resolution: {integrity: sha512-DEAoo25RfSYMuTGc9vPJzZcZullwIqRDSI9LOy+fkCJPi6hykCnfKaXTuPBDuXAUcqHXyOgFtHNp/kB2FjYHbw==}
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dev: true
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@ -1,532 +0,0 @@
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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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||||
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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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||||
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||||
// this._latest.set(this);
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// this.add(this._speed);
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||||
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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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||||
});
|
||||
|
||||
|
||||
|
||||
// Initialize
|
||||
|
||||
(function() {
|
||||
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||||
// Configs
|
||||
|
||||
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
|
||||
|
||||
var canvas, context,
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bufferCvs, bufferCtx,
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||||
screenWidth, screenHeight,
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||||
mouse = new Vector(),
|
||||
gravities = [],
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||||
particles = [],
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||||
grad,
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||||
gui, control;
|
||||
|
||||
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||||
// Event Listeners
|
||||
|
||||
function resize(e) {
|
||||
screenWidth = canvas.width = window.innerWidth;
|
||||
screenHeight = canvas.height = window.innerHeight;
|
||||
bufferCvs.width = screenWidth;
|
||||
bufferCvs.height = screenHeight;
|
||||
context = canvas.getContext('2d');
|
||||
bufferCtx = bufferCvs.getContext('2d');
|
||||
|
||||
var cx = canvas.width * 0.5,
|
||||
cy = canvas.height * 0.5;
|
||||
|
||||
grad = context.createRadialGradient(cx, cy, 0, cx, cy, Math.sqrt(cx * cx + cy * cy));
|
||||
grad.addColorStop(0, 'rgba(0, 0, 0, 0)');
|
||||
grad.addColorStop(1, 'rgba(0, 0, 0, 0.35)');
|
||||
}
|
||||
|
||||
function mouseMove(e) {
|
||||
mouse.set(e.clientX, e.clientY);
|
||||
|
||||
var i, g, hit = false;
|
||||
for (i = gravities.length - 1; i >= 0; i--) {
|
||||
g = gravities[i];
|
||||
if ((!hit && g.hitTest(mouse)) || g.dragging)
|
||||
g.isMouseOver = hit = true;
|
||||
else
|
||||
g.isMouseOver = false;
|
||||
}
|
||||
|
||||
canvas.style.cursor = hit ? 'pointer' : 'default';
|
||||
}
|
||||
|
||||
function mouseDown(e) {
|
||||
for (var i = gravities.length - 1; i >= 0; i--) {
|
||||
if (gravities[i].isMouseOver) {
|
||||
gravities[i].startDrag(mouse);
|
||||
return;
|
||||
}
|
||||
}
|
||||
gravities.push(new GravityPoint(e.clientX, e.clientY, G_POINT_RADIUS, {
|
||||
particles: particles,
|
||||
gravities: gravities
|
||||
}));
|
||||
}
|
||||
|
||||
function mouseUp(e) {
|
||||
for (var i = 0, len = gravities.length; i < len; i++) {
|
||||
if (gravities[i].dragging) {
|
||||
gravities[i].endDrag();
|
||||
break;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
function doubleClick(e) {
|
||||
for (var i = gravities.length - 1; i >= 0; i--) {
|
||||
if (gravities[i].isMouseOver) {
|
||||
gravities[i].collapse();
|
||||
break;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
// Functions
|
||||
|
||||
function addParticle(num) {
|
||||
var i, p;
|
||||
for (i = 0; i < num; i++) {
|
||||
p = new Particle(
|
||||
Math.floor(Math.random() * screenWidth - PARTICLE_RADIUS * 2) + 1 + PARTICLE_RADIUS,
|
||||
Math.floor(Math.random() * screenHeight - PARTICLE_RADIUS * 2) + 1 + PARTICLE_RADIUS,
|
||||
PARTICLE_RADIUS
|
||||
);
|
||||
p.addSpeed(Vector.random());
|
||||
particles.push(p);
|
||||
}
|
||||
}
|
||||
|
||||
function removeParticle(num) {
|
||||
if (particles.length < num) num = particles.length;
|
||||
for (var i = 0; i < num; i++) {
|
||||
particles.pop();
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
// GUI Control
|
||||
|
||||
control = {
|
||||
particleNum: 100
|
||||
};
|
||||
|
||||
|
||||
// Init
|
||||
|
||||
canvas = document.getElementById('c');
|
||||
bufferCvs = document.createElement('canvas');
|
||||
|
||||
window.addEventListener('resize', resize, false);
|
||||
resize(null);
|
||||
|
||||
addParticle(control.particleNum);
|
||||
|
||||
canvas.addEventListener('mousemove', mouseMove, false);
|
||||
canvas.addEventListener('mousedown', mouseDown, false);
|
||||
canvas.addEventListener('mouseup', mouseUp, false);
|
||||
canvas.addEventListener('dblclick', doubleClick, false);
|
||||
|
||||
|
||||
// GUI
|
||||
|
||||
gui = new dat.GUI();
|
||||
gui.add(control, 'particleNum', 0, 500).step(1).name('Particle Num').onChange(function() {
|
||||
var n = (control.particleNum | 0) - particles.length;
|
||||
if (n > 0)
|
||||
addParticle(n);
|
||||
else if (n < 0)
|
||||
removeParticle(-n);
|
||||
});
|
||||
gui.add(GravityPoint, 'interferenceToPoint').name('Interference Between Point');
|
||||
gui.close();
|
||||
|
||||
|
||||
// Start Update
|
||||
|
||||
var loop = function() {
|
||||
var i, len, g, p;
|
||||
|
||||
context.save();
|
||||
context.fillStyle = BACKGROUND_COLOR;
|
||||
context.fillRect(0, 0, screenWidth, screenHeight);
|
||||
context.fillStyle = grad;
|
||||
context.fillRect(0, 0, screenWidth, screenHeight);
|
||||
context.restore();
|
||||
|
||||
for (i = 0, len = gravities.length; i < len; i++) {
|
||||
g = gravities[i];
|
||||
if (g.dragging) g.drag(mouse);
|
||||
g.render(context);
|
||||
if (g.destroyed) {
|
||||
gravities.splice(i, 1);
|
||||
len--;
|
||||
i--;
|
||||
}
|
||||
}
|
||||
|
||||
bufferCtx.save();
|
||||
bufferCtx.globalCompositeOperation = 'destination-out';
|
||||
bufferCtx.globalAlpha = 0.35;
|
||||
bufferCtx.fillRect(0, 0, screenWidth, screenHeight);
|
||||
bufferCtx.restore();
|
||||
|
||||
// パーティクルをバッファに描画
|
||||
// for (i = 0, len = particles.length; i < len; i++) {
|
||||
// particles[i].render(bufferCtx);
|
||||
// }
|
||||
len = particles.length;
|
||||
bufferCtx.save();
|
||||
bufferCtx.fillStyle = bufferCtx.strokeStyle = '#fff';
|
||||
bufferCtx.lineCap = bufferCtx.lineJoin = 'round';
|
||||
bufferCtx.lineWidth = PARTICLE_RADIUS * 2;
|
||||
bufferCtx.beginPath();
|
||||
for (i = 0; i < len; i++) {
|
||||
p = particles[i];
|
||||
p.update();
|
||||
bufferCtx.moveTo(p.x, p.y);
|
||||
bufferCtx.lineTo(p._latest.x, p._latest.y);
|
||||
}
|
||||
bufferCtx.stroke();
|
||||
bufferCtx.beginPath();
|
||||
for (i = 0; i < len; i++) {
|
||||
p = particles[i];
|
||||
bufferCtx.moveTo(p.x, p.y);
|
||||
bufferCtx.arc(p.x, p.y, p.radius, 0, Math.PI * 2, false);
|
||||
}
|
||||
bufferCtx.fill();
|
||||
bufferCtx.restore();
|
||||
|
||||
// バッファをキャンバスに描画
|
||||
context.drawImage(bufferCvs, 0, 0);
|
||||
|
||||
requestAnimationFrame(loop);
|
||||
};
|
||||
loop();
|
||||
|
||||
})();
|
||||
|
||||
@ -1,15 +0,0 @@
|
||||
<!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="mainCanvas"></canvas>
|
||||
<div class="info">Click to add gravity point.</div>
|
||||
</body>
|
||||
</html>
|
||||
|
||||
@ -1,28 +0,0 @@
|
||||
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);
|
||||
}
|
||||
@ -1,40 +1,532 @@
|
||||
const Victor = require("victor");
|
||||
/**
|
||||
* requestAnimationFrame
|
||||
*/
|
||||
window.requestAnimationFrame = (function(){
|
||||
return window.requestAnimationFrame ||
|
||||
window.webkitRequestAnimationFrame ||
|
||||
window.mozRequestAnimationFrame ||
|
||||
window.oRequestAnimationFrame ||
|
||||
window.msRequestAnimationFrame ||
|
||||
function (callback) {
|
||||
window.setTimeout(callback, 1000 / 60);
|
||||
};
|
||||
})();
|
||||
|
||||
// TODO cycle this bkg color
|
||||
const BACKGROUND_COLOR = 'rgba(11, 51, 56, 1)';
|
||||
const PARTICLE_RADIUS = 1;
|
||||
const G_POINT_RADIUS = 10;
|
||||
const G_POINT_RADIUS_LIMITS = 65;
|
||||
|
||||
const canvas = document.getElementById("mainCanvas");
|
||||
const bufferCvs = document.createElement("canvas");
|
||||
const context = canvas.getContext('2d');
|
||||
const bufferCtx = bufferCvs.getContext('2d');
|
||||
/**
|
||||
* Vector
|
||||
*/
|
||||
function Vector(x, y) {
|
||||
this.x = x || 0;
|
||||
this.y = y || 0;
|
||||
}
|
||||
|
||||
const screenWidth = canvas.width = window.innerWidth;
|
||||
const screenHeight = canvas.height = window.innerHeight;
|
||||
Vector.add = function(a, b) {
|
||||
return new Vector(a.x + b.x, a.y + b.y);
|
||||
};
|
||||
|
||||
console.log("Finished initting");
|
||||
Vector.sub = function(a, b) {
|
||||
return new Vector(a.x - b.x, a.y - b.y);
|
||||
};
|
||||
|
||||
const loop = (timestamp) => {
|
||||
window.requestAnimationFrame(loop);
|
||||
Vector.scale = function(v, s) {
|
||||
return v.clone().scale(s);
|
||||
};
|
||||
|
||||
const cx = canvas.width / 2;
|
||||
const cy = canvas.height / 2;
|
||||
Vector.random = function() {
|
||||
return new Vector(
|
||||
Math.random() * 2 - 1,
|
||||
Math.random() * 2 - 1
|
||||
);
|
||||
};
|
||||
|
||||
Vector.prototype = {
|
||||
set: function(x, y) {
|
||||
if (typeof x === 'object') {
|
||||
y = x.y;
|
||||
x = x.x;
|
||||
}
|
||||
this.x = x || 0;
|
||||
this.y = y || 0;
|
||||
return this;
|
||||
},
|
||||
|
||||
add: function(v) {
|
||||
this.x += v.x;
|
||||
this.y += v.y;
|
||||
return this;
|
||||
},
|
||||
|
||||
sub: function(v) {
|
||||
this.x -= v.x;
|
||||
this.y -= v.y;
|
||||
return this;
|
||||
},
|
||||
|
||||
scale: function(s) {
|
||||
this.x *= s;
|
||||
this.y *= s;
|
||||
return this;
|
||||
},
|
||||
|
||||
length: function() {
|
||||
return Math.sqrt(this.x * this.x + this.y * this.y);
|
||||
},
|
||||
|
||||
lengthSq: function() {
|
||||
return this.x * this.x + this.y * this.y;
|
||||
},
|
||||
|
||||
normalize: function() {
|
||||
var m = Math.sqrt(this.x * this.x + this.y * this.y);
|
||||
if (m) {
|
||||
this.x /= m;
|
||||
this.y /= m;
|
||||
}
|
||||
return this;
|
||||
},
|
||||
|
||||
angle: function() {
|
||||
return Math.atan2(this.y, this.x);
|
||||
},
|
||||
|
||||
angleTo: function(v) {
|
||||
var dx = v.x - this.x,
|
||||
dy = v.y - this.y;
|
||||
return Math.atan2(dy, dx);
|
||||
},
|
||||
|
||||
distanceTo: function(v) {
|
||||
var dx = v.x - this.x,
|
||||
dy = v.y - this.y;
|
||||
return Math.sqrt(dx * dx + dy * dy);
|
||||
},
|
||||
|
||||
distanceToSq: function(v) {
|
||||
var dx = v.x - this.x,
|
||||
dy = v.y - this.y;
|
||||
return dx * dx + dy * dy;
|
||||
},
|
||||
|
||||
lerp: function(v, t) {
|
||||
this.x += (v.x - this.x) * t;
|
||||
this.y += (v.y - this.y) * t;
|
||||
return this;
|
||||
},
|
||||
|
||||
clone: function() {
|
||||
return new Vector(this.x, this.y);
|
||||
},
|
||||
|
||||
toString: function() {
|
||||
return '(x:' + this.x + ', y:' + this.y + ')';
|
||||
}
|
||||
};
|
||||
|
||||
|
||||
/**
|
||||
* GravityPoint
|
||||
*/
|
||||
function GravityPoint(x, y, radius, targets) {
|
||||
Vector.call(this, x, y);
|
||||
this.radius = radius;
|
||||
this.currentRadius = radius * 0.5;
|
||||
|
||||
this._targets = {
|
||||
particles: targets.particles || [],
|
||||
gravities: targets.gravities || []
|
||||
};
|
||||
this._speed = new Vector();
|
||||
}
|
||||
|
||||
GravityPoint.RADIUS_LIMIT = 65;
|
||||
GravityPoint.interferenceToPoint = true;
|
||||
|
||||
GravityPoint.prototype = (function(o) {
|
||||
var s = new Vector(0, 0), p;
|
||||
for (p in o) s[p] = o[p];
|
||||
return s;
|
||||
})({
|
||||
gravity: 0.05,
|
||||
isMouseOver: false,
|
||||
dragging: false,
|
||||
destroyed: false,
|
||||
_easeRadius: 0,
|
||||
_dragDistance: null,
|
||||
_collapsing: false,
|
||||
|
||||
hitTest: function(p) {
|
||||
return this.distanceTo(p) < this.radius;
|
||||
},
|
||||
|
||||
startDrag: function(dragStartPoint) {
|
||||
this._dragDistance = Vector.sub(dragStartPoint, this);
|
||||
this.dragging = true;
|
||||
},
|
||||
|
||||
drag: function(dragToPoint) {
|
||||
this.x = dragToPoint.x - this._dragDistance.x;
|
||||
this.y = dragToPoint.y - this._dragDistance.y;
|
||||
},
|
||||
|
||||
endDrag: function() {
|
||||
this._dragDistance = null;
|
||||
this.dragging = false;
|
||||
},
|
||||
|
||||
addSpeed: function(d) {
|
||||
this._speed = this._speed.add(d);
|
||||
},
|
||||
|
||||
collapse: function(e) {
|
||||
this.currentRadius *= 1.75;
|
||||
this._collapsing = true;
|
||||
},
|
||||
|
||||
render: function(ctx) {
|
||||
if (this.destroyed) return;
|
||||
|
||||
var particles = this._targets.particles,
|
||||
i, len;
|
||||
|
||||
for (i = 0, len = particles.length; i < len; i++) {
|
||||
particles[i].addSpeed(Vector.sub(this, particles[i]).normalize().scale(this.gravity));
|
||||
}
|
||||
|
||||
this._easeRadius = (this._easeRadius + (this.radius - this.currentRadius) * 0.07) * 0.95;
|
||||
this.currentRadius += this._easeRadius;
|
||||
if (this.currentRadius < 0) this.currentRadius = 0;
|
||||
|
||||
if (this._collapsing) {
|
||||
this.radius *= 0.75;
|
||||
if (this.currentRadius < 1) this.destroyed = true;
|
||||
this._draw(ctx);
|
||||
return;
|
||||
}
|
||||
|
||||
var gravities = this._targets.gravities,
|
||||
g, absorp,
|
||||
area = this.radius * this.radius * Math.PI, garea;
|
||||
|
||||
for (i = 0, len = gravities.length; i < len; i++) {
|
||||
g = gravities[i];
|
||||
|
||||
if (g === this || g.destroyed) continue;
|
||||
|
||||
if (
|
||||
(this.currentRadius >= g.radius || this.dragging) &&
|
||||
this.distanceTo(g) < (this.currentRadius + g.radius) * 0.85
|
||||
) {
|
||||
g.destroyed = true;
|
||||
this.gravity += g.gravity;
|
||||
|
||||
absorp = Vector.sub(g, this).scale(g.radius / this.radius * 0.5);
|
||||
this.addSpeed(absorp);
|
||||
|
||||
garea = g.radius * g.radius * Math.PI;
|
||||
this.currentRadius = Math.sqrt((area + garea * 3) / Math.PI);
|
||||
this.radius = Math.sqrt((area + garea) / Math.PI);
|
||||
}
|
||||
|
||||
g.addSpeed(Vector.sub(this, g).normalize().scale(this.gravity));
|
||||
}
|
||||
|
||||
if (GravityPoint.interferenceToPoint && !this.dragging)
|
||||
this.add(this._speed);
|
||||
|
||||
this._speed = new Vector();
|
||||
|
||||
if (this.currentRadius > GravityPoint.RADIUS_LIMIT) this.collapse();
|
||||
|
||||
this._draw(ctx);
|
||||
},
|
||||
|
||||
_draw: function(ctx) {
|
||||
var grd, r;
|
||||
|
||||
ctx.save();
|
||||
|
||||
grd = ctx.createRadialGradient(this.x, this.y, this.radius, this.x, this.y, this.radius * 5);
|
||||
grd.addColorStop(0, 'rgba(0, 0, 0, 0.1)');
|
||||
grd.addColorStop(1, 'rgba(0, 0, 0, 0)');
|
||||
ctx.beginPath();
|
||||
ctx.arc(this.x, this.y, this.radius * 5, 0, Math.PI * 2, false);
|
||||
ctx.fillStyle = grd;
|
||||
ctx.fill();
|
||||
|
||||
r = Math.random() * this.currentRadius * 0.7 + this.currentRadius * 0.3;
|
||||
grd = ctx.createRadialGradient(this.x, this.y, r, this.x, this.y, this.currentRadius);
|
||||
grd.addColorStop(0, 'rgba(0, 0, 0, 1)');
|
||||
grd.addColorStop(1, Math.random() < 0.2 ? 'rgba(255, 196, 0, 0.15)' : 'rgba(103, 181, 191, 0.75)');
|
||||
ctx.beginPath();
|
||||
ctx.arc(this.x, this.y, this.currentRadius, 0, Math.PI * 2, false);
|
||||
ctx.fillStyle = grd;
|
||||
ctx.fill();
|
||||
ctx.restore();
|
||||
}
|
||||
});
|
||||
|
||||
|
||||
/**
|
||||
* Particle
|
||||
*/
|
||||
function Particle(x, y, radius) {
|
||||
Vector.call(this, x, y);
|
||||
this.radius = radius;
|
||||
|
||||
this._latest = new Vector();
|
||||
this._speed = new Vector();
|
||||
}
|
||||
|
||||
Particle.prototype = (function(o) {
|
||||
var s = new Vector(0, 0), p;
|
||||
for (p in o) s[p] = o[p];
|
||||
return s;
|
||||
})({
|
||||
addSpeed: function(d) {
|
||||
this._speed.add(d);
|
||||
},
|
||||
|
||||
update: function() {
|
||||
if (this._speed.length() > 12) this._speed.normalize().scale(12);
|
||||
|
||||
this._latest.set(this);
|
||||
this.add(this._speed);
|
||||
}
|
||||
|
||||
// render: function(ctx) {
|
||||
// if (this._speed.length() > 12) this._speed.normalize().scale(12);
|
||||
|
||||
// this._latest.set(this);
|
||||
// this.add(this._speed);
|
||||
|
||||
// ctx.save();
|
||||
// ctx.fillStyle = ctx.strokeStyle = '#fff';
|
||||
// ctx.lineCap = ctx.lineJoin = 'round';
|
||||
// ctx.lineWidth = this.radius * 2;
|
||||
// ctx.beginPath();
|
||||
// ctx.moveTo(this.x, this.y);
|
||||
// ctx.lineTo(this._latest.x, this._latest.y);
|
||||
// ctx.stroke();
|
||||
// ctx.beginPath();
|
||||
// ctx.arc(this.x, this.y, this.radius, 0, Math.PI * 2, false);
|
||||
// ctx.fill();
|
||||
// ctx.restore();
|
||||
// }
|
||||
});
|
||||
|
||||
|
||||
|
||||
// Initialize
|
||||
|
||||
(function() {
|
||||
|
||||
// Configs
|
||||
|
||||
var BACKGROUND_COLOR = 'rgba(11, 51, 56, 1)',
|
||||
PARTICLE_RADIUS = 1,
|
||||
G_POINT_RADIUS = 10,
|
||||
G_POINT_RADIUS_LIMITS = 65;
|
||||
|
||||
|
||||
// Vars
|
||||
|
||||
var canvas, context,
|
||||
bufferCvs, bufferCtx,
|
||||
screenWidth, screenHeight,
|
||||
mouse = new Vector(),
|
||||
gravities = [],
|
||||
particles = [],
|
||||
grad,
|
||||
gui, control;
|
||||
|
||||
|
||||
// Event Listeners
|
||||
|
||||
function resize(e) {
|
||||
screenWidth = canvas.width = window.innerWidth;
|
||||
screenHeight = canvas.height = window.innerHeight;
|
||||
bufferCvs.width = screenWidth;
|
||||
bufferCvs.height = screenHeight;
|
||||
context = canvas.getContext('2d');
|
||||
bufferCtx = bufferCvs.getContext('2d');
|
||||
|
||||
var cx = canvas.width * 0.5,
|
||||
cy = canvas.height * 0.5;
|
||||
|
||||
grad = context.createRadialGradient(cx, cy, 0, cx, cy, Math.sqrt(cx * cx + cy * cy));
|
||||
grad.addColorStop(0, 'rgba(0, 0, 0, 0)');
|
||||
grad.addColorStop(1, 'rgba(0, 0, 0, 0.35)');
|
||||
}
|
||||
|
||||
function mouseMove(e) {
|
||||
mouse.set(e.clientX, e.clientY);
|
||||
|
||||
var i, g, hit = false;
|
||||
for (i = gravities.length - 1; i >= 0; i--) {
|
||||
g = gravities[i];
|
||||
if ((!hit && g.hitTest(mouse)) || g.dragging)
|
||||
g.isMouseOver = hit = true;
|
||||
else
|
||||
g.isMouseOver = false;
|
||||
}
|
||||
|
||||
canvas.style.cursor = hit ? 'pointer' : 'default';
|
||||
}
|
||||
|
||||
function mouseDown(e) {
|
||||
for (var i = gravities.length - 1; i >= 0; i--) {
|
||||
if (gravities[i].isMouseOver) {
|
||||
gravities[i].startDrag(mouse);
|
||||
return;
|
||||
}
|
||||
}
|
||||
gravities.push(new GravityPoint(e.clientX, e.clientY, G_POINT_RADIUS, {
|
||||
particles: particles,
|
||||
gravities: gravities
|
||||
}));
|
||||
}
|
||||
|
||||
function mouseUp(e) {
|
||||
for (var i = 0, len = gravities.length; i < len; i++) {
|
||||
if (gravities[i].dragging) {
|
||||
gravities[i].endDrag();
|
||||
break;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
function doubleClick(e) {
|
||||
for (var i = gravities.length - 1; i >= 0; i--) {
|
||||
if (gravities[i].isMouseOver) {
|
||||
gravities[i].collapse();
|
||||
break;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
// Functions
|
||||
|
||||
function addParticle(num) {
|
||||
var i, p;
|
||||
for (i = 0; i < num; i++) {
|
||||
p = new Particle(
|
||||
Math.floor(Math.random() * screenWidth - PARTICLE_RADIUS * 2) + 1 + PARTICLE_RADIUS,
|
||||
Math.floor(Math.random() * screenHeight - PARTICLE_RADIUS * 2) + 1 + PARTICLE_RADIUS,
|
||||
PARTICLE_RADIUS
|
||||
);
|
||||
p.addSpeed(Vector.random());
|
||||
particles.push(p);
|
||||
}
|
||||
}
|
||||
|
||||
function removeParticle(num) {
|
||||
if (particles.length < num) num = particles.length;
|
||||
for (var i = 0; i < num; i++) {
|
||||
particles.pop();
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
// GUI Control
|
||||
|
||||
control = {
|
||||
particleNum: 100
|
||||
};
|
||||
|
||||
|
||||
// Init
|
||||
|
||||
canvas = document.getElementById('c');
|
||||
bufferCvs = document.createElement('canvas');
|
||||
|
||||
window.addEventListener('resize', resize, false);
|
||||
resize(null);
|
||||
|
||||
addParticle(control.particleNum);
|
||||
|
||||
canvas.addEventListener('mousemove', mouseMove, false);
|
||||
canvas.addEventListener('mousedown', mouseDown, false);
|
||||
canvas.addEventListener('mouseup', mouseUp, false);
|
||||
canvas.addEventListener('dblclick', doubleClick, false);
|
||||
|
||||
|
||||
// GUI
|
||||
|
||||
gui = new dat.GUI();
|
||||
gui.add(control, 'particleNum', 0, 500).step(1).name('Particle Num').onChange(function() {
|
||||
var n = (control.particleNum | 0) - particles.length;
|
||||
if (n > 0)
|
||||
addParticle(n);
|
||||
else if (n < 0)
|
||||
removeParticle(-n);
|
||||
});
|
||||
gui.add(GravityPoint, 'interferenceToPoint').name('Interference Between Point');
|
||||
gui.close();
|
||||
|
||||
|
||||
// Start Update
|
||||
|
||||
var loop = function() {
|
||||
var i, len, g, p;
|
||||
|
||||
context.save();
|
||||
context.fillStyle = BACKGROUND_COLOR;
|
||||
context.fillRect(0, 0, screenWidth, screenHeight);
|
||||
|
||||
// create circular gradient that fills the screen
|
||||
const grad = context.createRadialGradient(cx, cy, 0, cx, cy, Math.sqrt(cx * cx + cy * cy));
|
||||
grad.addColorStop(0, 'rgba(0, 0, 0, 0)');
|
||||
grad.addColorStop(1, 'rgba(0, 0, 0, 0.35)');
|
||||
|
||||
context.fillStyle = grad;
|
||||
context.fillRect(0, 0, screenWidth, screenHeight);
|
||||
context.restore();
|
||||
};
|
||||
|
||||
for (i = 0, len = gravities.length; i < len; i++) {
|
||||
g = gravities[i];
|
||||
if (g.dragging) g.drag(mouse);
|
||||
g.render(context);
|
||||
if (g.destroyed) {
|
||||
gravities.splice(i, 1);
|
||||
len--;
|
||||
i--;
|
||||
}
|
||||
}
|
||||
|
||||
bufferCtx.save();
|
||||
bufferCtx.globalCompositeOperation = 'destination-out';
|
||||
bufferCtx.globalAlpha = 0.35;
|
||||
bufferCtx.fillRect(0, 0, screenWidth, screenHeight);
|
||||
bufferCtx.restore();
|
||||
|
||||
// パーティクルをバッファに描画
|
||||
// for (i = 0, len = particles.length; i < len; i++) {
|
||||
// particles[i].render(bufferCtx);
|
||||
// }
|
||||
len = particles.length;
|
||||
bufferCtx.save();
|
||||
bufferCtx.fillStyle = bufferCtx.strokeStyle = '#fff';
|
||||
bufferCtx.lineCap = bufferCtx.lineJoin = 'round';
|
||||
bufferCtx.lineWidth = PARTICLE_RADIUS * 2;
|
||||
bufferCtx.beginPath();
|
||||
for (i = 0; i < len; i++) {
|
||||
p = particles[i];
|
||||
p.update();
|
||||
bufferCtx.moveTo(p.x, p.y);
|
||||
bufferCtx.lineTo(p._latest.x, p._latest.y);
|
||||
}
|
||||
bufferCtx.stroke();
|
||||
bufferCtx.beginPath();
|
||||
for (i = 0; i < len; i++) {
|
||||
p = particles[i];
|
||||
bufferCtx.moveTo(p.x, p.y);
|
||||
bufferCtx.arc(p.x, p.y, p.radius, 0, Math.PI * 2, false);
|
||||
}
|
||||
bufferCtx.fill();
|
||||
bufferCtx.restore();
|
||||
|
||||
// バッファをキャンバスに描画
|
||||
context.drawImage(bufferCvs, 0, 0);
|
||||
|
||||
requestAnimationFrame(loop);
|
||||
};
|
||||
loop();
|
||||
|
||||
})();
|
||||
|
||||
loop();
|
||||
|
||||
@ -8,7 +8,7 @@
|
||||
<script type="module" src="app.js"></script>
|
||||
</head>
|
||||
<body>
|
||||
<canvas id="mainCanvas"></canvas>
|
||||
<canvas id="c"></canvas>
|
||||
<div class="info">Click to add gravity point.</div>
|
||||
</body>
|
||||
</html>
|
||||
|
||||
@ -1,15 +1,20 @@
|
||||
body {
|
||||
font-family: "Fira Sans", Helvetica, sans-serif;
|
||||
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: 10;
|
||||
left: 10;
|
||||
top: 0;
|
||||
left: 0;
|
||||
}
|
||||
|
||||
.info {
|
||||
|
||||
@ -15,8 +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-extern/index.html">Gravity Points (theirs)</a>
|
||||
<li> <a href="./gravity-points/index.html">Gravity Points (mine)</a>
|
||||
<li> <a href="./gravity-points/index.html">Gravity Points (theirs)</a>
|
||||
</ul>
|
||||
</body>
|
||||
</html>
|
||||
|
||||
Loading…
Reference in New Issue
Block a user