534 lines
16 KiB
JavaScript
534 lines
16 KiB
JavaScript
(function(window){
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function random(min, max) {
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return min + Math.floor(Math.random() * (max - min + 1));
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}
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function bezier(cp, t) {
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var p1 = cp[0].mul((1 - t) * (1 - t));
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var p2 = cp[1].mul(2 * t * (1 - t));
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var p3 = cp[2].mul(t * t);
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return p1.add(p2).add(p3);
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}
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function inheart(x, y, r) {
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// x^2+(y-(x^2)^(1/3))^2 = 1
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// http://www.wolframalpha.com/input/?i=x%5E2%2B%28y-%28x%5E2%29%5E%281%2F3%29%29%5E2+%3D+1
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var z = ((x / r) * (x / r) + (y / r) * (y / r) - 1) * ((x / r) * (x / r) + (y / r) * (y / r) - 1) * ((x / r) * (x / r) + (y / r) * (y / r) - 1) - (x / r) * (x / r) * (y / r) * (y / r) * (y / r);
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return z < 0;
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}
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Point = function(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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Point.prototype = {
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clone: function() {
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return new Point(this.x, this.y);
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},
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add: function(o) {
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p = this.clone();
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p.x += o.x;
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p.y += o.y;
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return p;
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},
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sub: function(o) {
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p = this.clone();
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p.x -= o.x;
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p.y -= o.y;
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return p;
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},
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div: function(n) {
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p = this.clone();
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p.x /= n;
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p.y /= n;
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return p;
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},
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mul: function(n) {
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p = this.clone();
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p.x *= n;
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p.y *= n;
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return p;
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}
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}
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Heart = function() {
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// x = 16 sin^3 t
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// y = 13 cos t - 5 cos 2t - 2 cos 3t - cos 4t
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// http://www.wolframalpha.com/input/?i=x+%3D+16+sin%5E3+t%2C+y+%3D+(13+cos+t+-+5+cos+2t+-+2+cos+3t+-+cos+4t)
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var points = [], x, y, t;
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for (var i = 10; i < 30; i += 0.2) {
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t = i / Math.PI;
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x = 16 * Math.pow(Math.sin(t), 3);
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y = 13 * Math.cos(t) - 5 * Math.cos(2 * t) - 2 * Math.cos(3 * t) - Math.cos(4 * t);
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points.push(new Point(x, y));
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}
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this.points = points;
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this.length = points.length;
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}
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Heart.prototype = {
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get: function(i, scale) {
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return this.points[i].mul(scale || 1);
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}
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}
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Seed = function(tree, point, scale, color) {
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this.tree = tree;
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var scale = scale || 1
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var color = color || '#FF0000';
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this.heart = {
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point : point,
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scale : scale,
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color : color,
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figure : new Heart(),
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}
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this.cirle = {
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point : point,
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scale : scale,
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color : color,
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radius : 5,
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}
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}
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Seed.prototype = {
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draw: function() {
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this.drawHeart();
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this.drawText();
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},
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addPosition: function(x, y) {
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this.cirle.point = this.cirle.point.add(new Point(x, y));
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},
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canMove: function() {
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return this.cirle.point.y < (this.tree.height + 20);
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},
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move: function(x, y) {
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this.clear();
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this.drawCirle();
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this.addPosition(x, y);
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},
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canScale: function() {
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return this.heart.scale > 0.2;
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},
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setHeartScale: function(scale) {
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this.heart.scale *= scale;
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},
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scale: function(scale) {
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this.clear();
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this.drawCirle();
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this.drawHeart();
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this.setHeartScale(scale);
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},
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drawHeart: function() {
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var ctx = this.tree.ctx, heart = this.heart;
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var point = heart.point, color = heart.color,
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scale = heart.scale;
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ctx.save();
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ctx.fillStyle = color;
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ctx.translate(point.x, point.y);
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ctx.beginPath();
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ctx.moveTo(0, 0);
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for (var i = 0; i < heart.figure.length; i++) {
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var p = heart.figure.get(i, scale);
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ctx.lineTo(p.x, -p.y);
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}
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ctx.closePath();
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ctx.fill();
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ctx.restore();
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},
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drawCirle: function() {
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var ctx = this.tree.ctx, cirle = this.cirle;
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var point = cirle.point, color = cirle.color,
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scale = cirle.scale, radius = cirle.radius;
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ctx.save();
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ctx.fillStyle = color;
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ctx.translate(point.x, point.y);
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ctx.scale(scale, scale);
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ctx.beginPath();
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ctx.moveTo(0, 0);
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ctx.arc(0, 0, radius, 0, 2 * Math.PI);
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ctx.closePath();
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ctx.fill();
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ctx.restore();
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},
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drawText: function() {
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var ctx = this.tree.ctx, heart = this.heart;
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var point = heart.point, color = heart.color,
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scale = heart.scale;
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ctx.save();
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ctx.strokeStyle = color;
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ctx.fillStyle = color;
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ctx.translate(point.x, point.y);
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ctx.scale(scale, scale);
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ctx.moveTo(0, 0);
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ctx.lineTo(15, 15);
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ctx.lineTo(60, 15);
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ctx.stroke();
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ctx.moveTo(0, 0);
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ctx.scale(0.75, 0.75);
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ctx.font = "12px 微软雅黑,Verdana"; // 字号肿么没有用? (ˉ(∞)ˉ)
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ctx.fillText("Come Baby", 23, 10);
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ctx.restore();
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},
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clear: function() {
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var ctx = this.tree.ctx, cirle = this.cirle;
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var point = cirle.point, scale = cirle.scale, radius = 26;
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var w = h = (radius * scale);
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ctx.clearRect(point.x - w, point.y - h, 4 * w, 4 * h);
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},
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hover: function(x, y) {
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var ctx = this.tree.ctx;
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var pixel = ctx.getImageData(x, y, 1, 1);
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return pixel.data[3] == 255
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}
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}
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Footer = function(tree, width, height, speed) {
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this.tree = tree;
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this.point = new Point(tree.seed.heart.point.x, tree.height - height / 2);
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this.width = width;
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this.height = height;
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this.speed = speed || 2;
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this.length = 0;
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}
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Footer.prototype = {
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draw: function() {
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var ctx = this.tree.ctx, point = this.point;
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var len = this.length / 2;
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ctx.save();
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ctx.strokeStyle = 'rgb(35, 31, 32)';
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ctx.lineWidth = this.height;
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ctx.lineCap = 'round';
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ctx.lineJoin = 'round';
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ctx.translate(point.x, point.y);
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ctx.beginPath();
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ctx.moveTo(0, 0);
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ctx.lineTo(len, 0);
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ctx.lineTo(-len, 0);
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ctx.stroke();
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ctx.restore();
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if (this.length < this.width) {
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this.length += this.speed;
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}
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}
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}
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Tree = function(canvas, width, height, opt) {
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this.canvas = canvas;
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this.ctx = canvas.getContext('2d');
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this.width = width;
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this.height = height;
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this.opt = opt || {};
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this.record = {};
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this.initSeed();
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this.initFooter();
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this.initBranch();
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this.initBloom();
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}
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Tree.prototype = {
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initSeed: function() {
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var seed = this.opt.seed || {};
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var x = seed.x || this.width / 2;
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var y = seed.y || this.height / 2;
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var point = new Point(x, y);
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var color = seed.color || '#FF0000';
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var scale = seed.scale || 1;
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this.seed = new Seed(this, point, scale, color);
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},
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initFooter: function() {
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var footer = this.opt.footer || {};
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var width = footer.width || this.width;
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var height = footer.height || 5;
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var speed = footer.speed || 2;
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this.footer = new Footer(this, width, height, speed);
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},
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initBranch: function() {
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var branchs = this.opt.branch || []
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this.branchs = [];
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this.addBranchs(branchs);
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},
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initBloom: function() {
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var bloom = this.opt.bloom || {};
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var cache = [],
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num = bloom.num || 500,
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width = bloom.width || this.width,
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height = bloom.height || this.height,
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figure = this.seed.heart.figure;
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var r = 240, x, y;
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for (var i = 0; i < num; i++) {
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cache.push(this.createBloom(width, height, r, figure));
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}
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this.blooms = [];
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this.bloomsCache = cache;
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},
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toDataURL: function(type) {
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return this.canvas.toDataURL(type);
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},
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draw: function(k) {
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var s = this, ctx = s.ctx;
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var rec = s.record[k];
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if (!rec) {
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return ;
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}
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var point = rec.point,
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image = rec.image;
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ctx.save();
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ctx.putImageData(image, point.x, point.y);
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ctx.restore();
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},
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addBranch: function(branch) {
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this.branchs.push(branch);
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},
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addBranchs: function(branchs){
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var s = this, b, p1, p2, p3, r, l, c;
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for (var i = 0; i < branchs.length; i++) {
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b = branchs[i];
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p1 = new Point(b[0], b[1]);
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p2 = new Point(b[2], b[3]);
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p3 = new Point(b[4], b[5]);
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r = b[6];
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l = b[7];
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c = b[8]
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s.addBranch(new Branch(s, p1, p2, p3, r, l, c));
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}
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},
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removeBranch: function(branch) {
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var branchs = this.branchs;
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for (var i = 0; i < branchs.length; i++) {
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if (branchs[i] === branch) {
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branchs.splice(i, 1);
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}
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}
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},
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canGrow: function() {
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return !!this.branchs.length;
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},
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grow: function() {
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var branchs = this.branchs;
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for (var i = 0; i < branchs.length; i++) {
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var branch = branchs[i];
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if (branch) {
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branch.grow();
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}
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}
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},
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addBloom: function (bloom) {
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this.blooms.push(bloom);
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},
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removeBloom: function (bloom) {
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var blooms = this.blooms;
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for (var i = 0; i < blooms.length; i++) {
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if (blooms[i] === bloom) {
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blooms.splice(i, 1);
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}
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}
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},
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createBloom: function(width, height, radius, figure, color, alpha, angle, scale, place, speed) {
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var x, y;
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while (true) {
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x = random(20, width - 20);
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y = random(20, height - 20);
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if (inheart(x - width / 2, height - (height - 40) / 2 - y, radius)) {
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return new Bloom(this, new Point(x, y), figure, color, alpha, angle, scale, place, speed);
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}
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}
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},
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canFlower: function() {
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return !!this.blooms.length;
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},
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flower: function(num) {
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var s = this, blooms = s.bloomsCache.splice(0, num);
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for (var i = 0; i < blooms.length; i++) {
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s.addBloom(blooms[i]);
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}
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blooms = s.blooms;
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for (var j = 0; j < blooms.length; j++) {
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blooms[j].flower();
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}
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},
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snapshot: function(k, x, y, width, height) {
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var ctx = this.ctx;
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var image = ctx.getImageData(x, y, width, height);
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this.record[k] = {
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image: image,
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point: new Point(x, y),
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width: width,
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height: height
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}
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},
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setSpeed: function(k, speed) {
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this.record[k || "move"].speed = speed;
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},
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move: function(k, x, y) {
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var s = this, ctx = s.ctx;
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var rec = s.record[k || "move"];
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var point = rec.point,
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image = rec.image,
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speed = rec.speed || 10,
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width = rec.width,
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height = rec.height;
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i = point.x + speed < x ? point.x + speed : x;
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j = point.y + speed < y ? point.y + speed : y;
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ctx.save();
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ctx.clearRect(point.x, point.y, width, height);
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ctx.putImageData(image, i, j);
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ctx.restore();
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rec.point = new Point(i, j);
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rec.speed = speed * 0.95;
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if (rec.speed < 2) {
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rec.speed = 2;
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}
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return i < x || j < y;
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},
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jump: function() {
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var s = this, blooms = s.blooms;
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if (blooms.length) {
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for (var i = 0; i < blooms.length; i++) {
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blooms[i].jump();
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}
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}
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if ((blooms.length && blooms.length < 3) || !blooms.length) {
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var bloom = this.opt.bloom || {},
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width = bloom.width || this.width,
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height = bloom.height || this.height,
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figure = this.seed.heart.figure;
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var r = 240, x, y;
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for (var i = 0; i < random(1,2); i++) {
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blooms.push(this.createBloom(width / 2 + width, height, r, figure, null, 1, null, 1, new Point(random(-100,600), 720), random(200,300)));
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}
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}
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}
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}
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Branch = function(tree, point1, point2, point3, radius, length, branchs) {
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this.tree = tree;
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this.point1 = point1;
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this.point2 = point2;
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this.point3 = point3;
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this.radius = radius;
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this.length = length || 100;
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this.len = 0;
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this.t = 1 / (this.length - 1);
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this.branchs = branchs || [];
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}
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Branch.prototype = {
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grow: function() {
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var s = this, p;
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if (s.len <= s.length) {
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p = bezier([s.point1, s.point2, s.point3], s.len * s.t);
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s.draw(p);
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s.len += 1;
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s.radius *= 0.97;
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} else {
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s.tree.removeBranch(s);
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s.tree.addBranchs(s.branchs);
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}
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},
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draw: function(p) {
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var s = this;
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var ctx = s.tree.ctx;
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ctx.save();
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ctx.beginPath();
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ctx.fillStyle = 'rgb(35, 31, 32)';
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ctx.shadowColor = 'rgb(35, 31, 32)';
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ctx.shadowBlur = 2;
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ctx.moveTo(p.x, p.y);
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ctx.arc(p.x, p.y, s.radius, 0, 2 * Math.PI);
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ctx.closePath();
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ctx.fill();
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ctx.restore();
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}
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}
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Bloom = function(tree, point, figure, color, alpha, angle, scale, place, speed) {
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this.tree = tree;
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this.point = point;
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this.color = color || 'rgb(255,' + random(0, 255) + ',' + random(0, 255) + ')';
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this.alpha = alpha || random(0.3, 1);
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this.angle = angle || random(0, 360);
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this.scale = scale || 0.1;
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this.place = place;
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this.speed = speed;
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this.figure = figure;
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}
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Bloom.prototype = {
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setFigure: function(figure) {
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this.figure = figure;
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},
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flower: function() {
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var s = this;
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s.draw();
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s.scale += 0.1;
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if (s.scale > 1) {
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s.tree.removeBloom(s);
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}
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},
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draw: function() {
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var s = this, ctx = s.tree.ctx, figure = s.figure;
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ctx.save();
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ctx.fillStyle = s.color;
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ctx.globalAlpha = s.alpha;
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ctx.translate(s.point.x, s.point.y);
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ctx.scale(s.scale, s.scale);
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ctx.rotate(s.angle);
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ctx.beginPath();
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ctx.moveTo(0, 0);
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for (var i = 0; i < figure.length; i++) {
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var p = figure.get(i);
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ctx.lineTo(p.x, -p.y);
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}
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ctx.closePath();
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ctx.fill();
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ctx.restore();
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},
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jump: function() {
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var s = this, height = s.tree.height;
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if (s.point.x < -20 || s.point.y > height + 20) {
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s.tree.removeBloom(s);
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} else {
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s.draw();
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s.point = s.place.sub(s.point).div(s.speed).add(s.point);
|
|
s.angle += 0.05;
|
|
s.speed -= 1;
|
|
}
|
|
}
|
|
}
|
|
|
|
window.random = random;
|
|
window.bezier = bezier;
|
|
window.Point = Point;
|
|
window.Tree = Tree;
|
|
|
|
})(window);
|