?? 前言?
“這個世界亂糟糟的而你干干凈凈可以懸在我心上做太陽和月亮?！保呦?jié)表白日，你要錯過嗎？如果你言辭不善，羞于開口的話，可以使用 html5 canvas 制作浪漫的七夕愛心表白動畫特效，全屏的愛心和表白語，了解一下！?
?? 效果圖
?? 代碼實現(xiàn)
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>七夕520愛心表白</title>
<style>
*{margin:0; padding:0;}
body{ background-color: #1E1E1E; }
</style>
</head>
<body>
<canvas id="drawHeart"></canvas>
<script>
var hearts = [];
var canvas = document.getElementById('drawHeart');
var wW = window.innerWidth;
var wH = window.innerHeight;
// 創(chuàng)建畫布
var ctx = canvas.getContext('2d');
// 創(chuàng)建圖片對象
var heartImage = new Image();
heartImage.src = 'img/heart.svg';
var num = 100;
init();
window.addEventListener('resize', function(){
wW = window.innerWidth;
wH = window.innerHeight;
});
// 初始化畫布大小
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 '愛你一輩子';
} else if(val > 3 && val <= 5){
return '感謝你';
} else if(val > 5 && val <= 8){
return '喜歡你';
} else{
return 'I Love You';
}
}
function Heart(type){
this.type = type;
// 初始化生成范圍
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;
// 縮放比例
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;
this.text = 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(!this.type){
// 設置文字屬性
ctx.fillStyle = getColor();
ctx.font = 'italic ' + this.fs + 'px sans-serif';
// 填充字符串
ctx.fillText(this.text, this.fx, this.fy);
}
ctx.restore();
}
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;
}
if(this.y - this.height > wH || this.y + this.height < 0){
// 重新初始化位置
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
this.fx = Math.random() * wW;
this.fy = Math.random() * wH;
}
}
function render(){
ctx.clearRect(0, 0, wW, wH);
for(var i = 0; i < hearts.length; i++){
hearts[i].draw();
hearts[i].update();
}
requestAnimationFrame(render);
}
</script>
</body>
</html>?? 最后，祝天下有情人終成眷屬 ??文章來源：http://www.zghlxwxcb.cn/news/detail-665697.html
文章來源地址http://www.zghlxwxcb.cn/news/detail-665697.html
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