我最近一直与HTML 5和具体画布对象经历过了第一时间后的HTML 5画布的缓慢更新。问题与鼠标移动/鼠标点击事件
我似乎有与鼠标事件的一些问题。
该方案是具有不同颜色的背景面的网格随机变化。上面有一个云形状,我用它作为剪辑区域,只能看到云下的网格部分。 (想想形状奇特炬光)
的问题是,我试图用鼠标移动云区,它不与任何鼠标移动或鼠标点击事件顺利更新。似乎需要一两个框架才能跟上,而单车颜色似乎还在继续。
我曾尝试:
- 取出随机颜色的加速。
- 仅使用简单的形状进行裁剪。
- 设置setInterval函数来更新每1ms
可以看出这里运行 - http://jsfiddle.net/mXrNk/14/
任何帮助,将不胜感激。可能丢失了一些明显的东西。
<script>
const FPS = 60;
var myimg = new Image();
window.addEventListener('click', clicked, true);
var mouseX = 170;
var mouseY = 80;
window.onload = init;
function init() {
canvas = document.getElementById('myCanvas');
context = canvas.getContext('2d');
myimg.src = "smile.png";
setInterval(draw, 1000/FPS);
}
function draw() {
context.clearRect(0,0,canvas.width,canvas.height);
// draw cloud
context.beginPath(); // begin custom shape
context.moveTo(mouseX, mouseY);
context.bezierCurveTo(mouseX-40, mouseY+20, mouseX-40, mouseY+70, mouseX+60, mouseY+70);
context.bezierCurveTo(mouseX+80, mouseY+100, mouseX+150, mouseY+100, mouseX+170, mouseY+70);
context.bezierCurveTo(mouseX+250, mouseY+70, mouseX+250, mouseY+40, mouseX+220, mouseY+20);
context.bezierCurveTo(mouseX+260, mouseY-40, mouseX+200, mouseY-50, mouseX+170, mouseY-30);
context.bezierCurveTo(mouseX+150, mouseY-75, mouseX+80, mouseY-60, mouseX+80, mouseY-30);
context.bezierCurveTo(mouseX+30, mouseY-75, mouseX-20, mouseY-60, mouseX, mouseY);
context.closePath(); // complete custom shape
context.lineWidth = 5;
context.strokeStyle = "#0000ff";
context.stroke();
context.save();
context.clip();
for (i = 0; i<7; i++) {
for (j = 0; j < 13; j++) {
context.strokeRect(j*myimg.width, i*myimg.height, myimg.width, myimg.height);
context.fillStyle = rndColor();
context.fillRect(j*myimg.width, i*myimg.height, myimg.width, myimg.height);
context.drawImage(myimg, j*myimg.width, i*myimg.height);
context.fillStyle = "black";
context.font = "italic 10pt Arial ";
context.fillText((i*13)+j, j*myimg.width+5,i*myimg.width+15);
}
}
context.restore();
}
function rndColor() {
return '#' + ('00000' + (Math.random() * 16777216 << 0).toString(16)).substr(-6);
}
function clicked(e) {
mouseX = e.pageX;
mouseY = e.pageY;
}
</script>
小提琴杀死铬糟糕! – Loktar