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