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rotateBevel3.html
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<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width,initial-scale=1,minimum-scale=1,maximum-scale=1,user-scalable=no" />
<title></title>
<style id="stylesheet">
</style>
</head>
<body>
<div id="content">
<div class="point">
<button id="add">碰撞一下</button>
</div>
<canvas id="canvas" width="400" height="300" style="background:#333"></canvas>
</div>
<script src="scripts/tool.js?id=1"></script>
<script id="scripts">
var canvas = document.getElementById('canvas');
var ctx = canvas.getContext('2d');
var centerX = Math.floor(canvas.width / 2);
var centerY = Math.floor(canvas.height / 2);
var requestID = null;
var balles = []; //存放页面上的球
var ball = null;
var gravity = 0.2;
var bounce = -0.6;
var lines = [];
var line = null;
var sin = null;
var cos = null;
var bounds = null;
document.getElementById('add').addEventListener('click', function() {
ball = new Ball(50, 0,10);
animation();
});
// 球函数
function Ball(x, y, radius) {
this.x = x;
this.y = y;
this.radius = radius;
this.angle = 0;
this.vx = 0;
this.vy = 0;
};
Ball.prototype.draw = function(context) {
context.beginPath();
context.arc(this.x, this.y, this.radius, 0, 2 * Math.PI, true);
context.fill();
context.closePath();
};
function Line(x1, y1, x2, y2) {
this.x = 0;
this.y = 0;
this.x1 = (x1 === undefined) ? 0 : x1;
this.y1 = (y1 === undefined) ? 0 : y1;
this.x2 = (x2 === undefined) ? 0 : x2;
this.y2 = (y2 === undefined) ? 0 : y2;
this.rotation = 0;
this.scaleX = 1;
this.scaleY = 1;
this.lineWidth = 1;
};
Line.prototype.draw = function(context) {
context.save();
context.translate(this.x, this.y); //平移
context.rotate(this.rotation); // 旋转
context.scale(this.scaleX, this.scaleY);
context.lineWidth = this.lineWidth;
context.beginPath();
context.moveTo(this.x1, this.y1);
context.lineTo(this.x2, this.y2);
context.closePath();
context.stroke();
context.restore();
};
Line.prototype.getBound = function() {
if(this.rotation === 0) {
var minX = Math.min(this.x1, this.x2);
var minY = Math.min(this.y1, this.y2);
var maxX = Math.max(this.x1, this.x2);
var maxY = Math.max(this.y1, this.y2);
return {
x: this.x + minX,
y: this.y + minY,
width: maxX - minX,
height: maxY - minY
};
} else {
//基于坐标系原点旋转
var sin = Math.sin(this.rotation);
var cos = Math.cos(this.rotation);
var x1r = cos * this.x1 + sin * this.y1;
var x2r = cos * this.x2 + sin * this.y2;
var y1r = cos * this.y1 + sin * this.x1;
var y2r = cos * this.y2 + sin * this.x2;
return {
x: this.x + Math.min(x1r, x2r),
y: this.y + Math.min(y1r, y2r),
width: Math.max(x1r, x2r) - Math.min(x1r, x2r),
height: Math.max(y1r, y2r) - Math.min(y1r, y2r)
};
}
};
function checkLine(line) {
bounds = line.getBound();
if(ball.x + ball.radius > bounds.x && ball.x - ball.radius < bounds.x + bounds.width) {
cos = Math.cos(line.rotation);
sin = Math.sin(line.rotation);
//旋转后的坐标和速度
var x1 = ball.x - line.x;
var y1 = ball.y - line.y;
var y2 = y1 * cos - x1 * sin;
var vy1 = ball.vy * cos - ball.vx * sin;
if(y2 > -ball.radius && y2 < vy1) {
var x2 = x1 * cos + y1 * sin;
var vx1 = ball.vx * cos + ball.vy * sin;
y2 = -ball.radius;
vy1 *= bounce;
//旋转回来，计算坐标和速度
x1 = x2 * cos - y2 * sin;
y1 = y2 * cos + x2 * sin;
ball.vx = vx1 * cos - vy1 * sin;
ball.vy = vy1 * cos + vx1 * sin;
ball.x = line.x + x1;
ball.y = line.y + y1;
};
};
};
function drawLine(line){
checkLine(line);
line.draw(ctx);
};
function animation() {
ctx.clearRect(0, 0, canvas.width, canvas.height);
ctx.fillStyle = '#fff';
ctx.strokeStyle = '#fff';
ball.vy += gravity;
ball.x += ball.vx;
ball.y += ball.vy;
if(ball.x + ball.radius > canvas.width) {
ball.x = canvas.width - ball.radius;
ball.vx *= bounce;
}else if(ball.x - ball.radius < 0){
ball.x = ball.radius;
ball.vx *= bounce;
};
if(ball.y + ball.radius > canvas.height){
ball.y = canvas.height - ball.radius;
ball.vy *= bounce;
}else if(ball.y - ball.radius < 0){
ball.y = ball.radius;
ball.vy *= bounce;
};
lines.forEach(drawLine);
ball.draw(ctx);
requestID = requestAnimationFrame(animation);
};
window.onload = function() {
line = new Line(-50, 0, 50, 0);
line.x = 100;
line.y = 100;
line.rotation = (30 * Math.PI / 180); //设置线的倾斜角度
lines.push(line);
line = new Line(-50, 0, 50, 0);
line.x = 100;
line.y = 200;
line.rotation = (45 * Math.PI / 180); //设置线的倾斜角度
lines.push(line);
line = new Line(-50, 0, 50, 0);
line.x = 250;
line.y = 150;
line.rotation = (-20 * Math.PI / 180); //设置线的倾斜角度
lines.push(line);
line = new Line(-50, 0, 50, 0);
line.x = 150;
line.y = 330;
line.rotation = (10 * Math.PI / 180); //设置线的倾斜角度
lines.push(line);
line = new Line(-50, 0, 50, 0);
line.x = 230;
line.y = 250;
line.rotation = (-30 * Math.PI / 180); //设置线的倾斜角度
lines.push(line);
}
</script>
</body>
</html>