web前端|js教程
Javascript,HTML5,Canvas,画板
web前端-js教程
本文实例为大家分享了HTML5 Canvas实现的一个画板代码，供大家参考，具体内容如下
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var canvas = document.getElementById(canvas); //获取标签 var ctx = canvas.getContext("2d"); var fillStyle = "black"; ctx.fillRect(0,0,600,300); var onoff = false; //按下标记 var oldx = -10; var oldy = -10; //设置颜色 var linecolor = "white"; var linw = 4; canvas.addEventListener("mousemove",draw,true); //鼠标移动事件 canvas.addEventListener("mousedown",down,false); //鼠标按下事件 canvas.addEventListener("mouseup",up,false); //鼠标弹起事件 function down(event){ onoff = true; oldx = event.pageX - 10; oldy = event.pageY - 10; } function up(){ onoff = false; } function draw(event){ if (onoff==true) {var newx = event.pageX - 10;var newy = event.pageY - 10ctx.beginPath();ctx.moveTo(oldx,oldy);ctx.lineTo(newx,newy);ctx.strokeStyle = linecolor;ctx.lineWidth = linw;ctx.lineCap = "round";ctx.stroke(); oldx = newx;oldy = newy; } } function copyimage(event) { var img_png_src = canvas.toDataURL("image/png"); //将画板保存为图片格式的函数 document.getElementById("image_png").src = img_png_src; }
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