520表⽩html,html5canvas全屏的520爱⼼表⽩⽹页代码
特效描述：html5 canvas全屏 520爱⼼表⽩ ⽹页代码。html5 canvas制作520表⽩⽇，全屏的爱⼼和表⽩语⽹页动画代码，浪漫的520爱⼼表⽩动画特效。
代码结构
1. HTML代码
var hearts = [];
var canvas = ElementById('drawHeart');
var wW = window.innerWidth;
var wH = window.innerHeight;
// 创建画布
var ctx = Context('2d');
// 创建图⽚对象
var heartImage = new Image();
heartImage.src = 'img/heart.svg';
var num = 100;
init();
window.addEventListener('resize', function(){
wW = window.innerWidth;
wH = window.innerHeight;
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});
// 初始化画布⼤⼩
function init(){
canvas.width = wW;
canvas.height = wH;
for(var i = 0; i < num; i++){
hearts.push(new Heart(i%5));
}
requestAnimationFrame(render);
}
function getColor(){
var val = Math.random() * 10;
if(val > 0 && val <= 1){
return '#00f';
} else if(val > 1 && val <= 2){
return '#f00';
} else if(val > 2 && val <= 3){ return '#0f0';
} else if(val > 3 && val <= 4){ return '#368';
} else if(val > 4 && val <= 5){ return '#666';
} else if(val > 5 && val <= 6){ return '#333';
} else if(val > 6 && val <= 7){ return '#f50';
} else if(val > 7 && val <= 8){ return '#e96d5b';
} else if(val > 8 && val <= 9){ return '#5be9e9';
} else {
return '#d41d50';
}
}
function getText(){
var val = Math.random() * 10; if(val > 1 && val <= 3){
return '爱你⼀辈⼦';
} else if(val > 3 && val <= 5){ return '感谢你';
} else if(val > 5 && val <= 8){ return '喜欢你';
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return 'I Love You';
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}
function Heart(type){
// 初始化⽣成范围
this.x = Math.random() * wW;
this.y = Math.random() * wH;
this.opacity = Math.random() * .5 + .5;
// 偏移量
this.vel = {
x: (Math.random() - .5) * 5,
y: (Math.random() - .5) * 5
}
this.initialW = wW * .5;
this.initialH = wH * .5;
// 缩放⽐例
this.targetScale = Math.random() * .15 + .02; // 最⼩0.02
this.scale = Math.random() * this.targetScale;
// ⽂字位置
this.fx = Math.random() * wW;
this.fy = Math.random() * wH;
this.fs = Math.random() * 10;
< = getText();
this.fvel = {
x: (Math.random() - .5) * 5,
y: (Math.random() - .5) * 5,
f: (Math.random() - .5) * 2
}
}
Heart.prototype.draw = function(){
ctx.save();
ctx.globalAlpha = this.opacity;
ctx.drawImage(heartImage, this.x, this.y, this.width, this.height); ctx.scale(this.scale + 1, this.scale + 1);
if(!pe){
// 设置⽂字属性
ctx.fillStyle = getColor();
ctx.font = 'italic ' + this.fs + 'px sans-serif';
// 填充字符串
ctx., this.fx, this.fy);
}
}
Heart.prototype.update = function(){
this.x += this.vel.x;
this.y += this.vel.y;
if(this.x - this.width > wW || this.x + this.width < 0){ // 重新初始化位置
this.scale = 0;
this.x = Math.random() * wW;
this.y = Math.random() * wH;
}
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this.scale = 0;
this.x = Math.random() * wW;
this.y = Math.random() * wH;
}
// 放⼤
this.scale += (this.targetScale - this.scale) * .1; this.height = this.scale * this.initialH;
this.width = this.height * 1.4;
/
/ -----⽂字-----
this.fx += this.fvel.x;
this.fy += this.fvel.y;
this.fs += this.fvel.f;
if(this.fs > 50){
this.fs = 2;
}
if(this.fx - this.fs > wW || this.fx + this.fs < 0){
// 重新初始化位置
this.fx = Math.random() * wW;
this.fy = Math.random() * wH;
}
if(this.fy - this.fs > wH || this.fy + this.fs < 0){ // 重新初始化位置
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this.fy = Math.random() * wH;
}
}
function render(){
ctx.clearRect(0, 0, wW, wH);
for(var i = 0; i < hearts.length; i++){
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hearts[i].update();
}
requestAnimationFrame(render);
}