Canvas放置反弹效果随机图形(实例)
var raf; var arror = []; var running = false; //绘制圆形 function createBall() { return { x: 0, y: 0, vx: 10-Math.random()*10, vy: 10-Math.random()*10, radius: 25, color:"red", draw: function() { ctx.beginPath(); ctx.arc(this.x, this.y, this.radius, 0, Math.PI * 2, true); ctx.closePath(); ctx.fillStyle = this.color; ctx.fill(); } } } //绘制正方形 function createSquare() { return { x: 0, y: 0, vx: 10-Math.random()*10, vy: 10-Math.random()*10, color:"red", draw: function() { ctx.beginPath(); ctx.fillStyle = this.color; ctx.fillRect(this.x, this.y,30, 30); ctx.closePath(); } } } //绘制五角星 function createStar() { return { x: 0, y: 0, vx: 10-Math.random()*10, vy: 10-Math.random()*10, color:"red", draw: function() { ctx.font = "24px serif"; ctx.textBaseline = "hanging"; ctx.fillStyle=this.color; ctx.fillText("五角星",this.x, this.y); } } } //绘制三角形 function createTriangle() { return { x: 0, y: 0, vx: 10-Math.random()*10, vy: 10-Math.random()*10, color:"red", draw: function() { ctx.beginPath(); ctx.moveTo(this.x,this.y); ctx.lineTo(this.x+25,this.y+25); ctx.lineTo(this.x+25,this.y-25); ctx.fillStyle=this.color; ctx.fill(); } } } //清除 function clear() { ctx.fillStyle = 'rgba(255,255,255,0.3)'; ctx.fillRect(0,0,canvas.width,canvas.height); } //判断图形坐标是否超出画布范围 function draw() { clear(); arror.forEach(function(ball, i){ ball.draw(); ball.x += ball.vx; ball.y += ball.vy; if (ball.y + ball.vy > canvas.height || ball.y + ball.vy < 0) { ball.vy = -ball.vy; } if (ball.x + ball.vx > canvas.width || ball.x + ball.vx < 0) { ball.vx = -ball.vx; } }); raf = window.requestAnimationFrame(draw); } canvas.addEventListener('click',function(e){ if (!running) { raf = window.requestAnimationFrame(draw); running = true; } var colorarr=["#000000","#7F7F7F","#880015","#ED1C24","#FF7F27","#FFF200","#22B14C","#00A2E8","#3F48CC","#A349A4","#B97A57","#FFAEC9","#B5E61D"]; var Graphics = ["Round","Square","Star","Triangle"]; var typexz=Graphics[Math.floor(Math.random()*4)]; var ball; switch(typexz){ case "Round": ball = createBall(); break; case "Square": ball = createSquare(); break; case "Star": ball = createStar(); break; case "Triangle": ball = createTriangle(); break; } ball.x = e.clientX; ball.y = e.clientY; ball.color = colorarr[Math.floor(Math.random() * 10 + 3)]; arror.push(ball); }); draw(); document.addEventListener('keydown',function (e) { if(e.keyCode==32){ event.preventDefault(); window.cancelAnimationFrame(raf); running = false; } })
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