我想知道是否可以在画布上添加/删除带有鼠标事件的圆圈,例如mousedown . 能够移动画布上绘制的棋子的主要观点 . 在这里我的代码绘制了各个部分,我添加了事件监听器,但我不知道如何绘制另一个部分,而是单击画布上的某个位置 .
<script type="text/javascript">
var canvas=document.getElementById("checkerboard");
var context2d=canvas.getContext("2d");
canvas.addEventListener("mousedown", moveP, false);
function play(){
context2d.fillStyle="red";
for(var x=0; x<8; x++){
for(var y=0; y<3; y++){
if(((x+y)%2)==1){
context2d.beginPath();
context2d.moveTo(x*80+5, y*80+40);
context2d.arc(x*80+40, y*80+40, 30, 0, 2*Math.PI);
context2d.lineWidth=15;
context2d.strokeStyle="#9F000F";
context2d.stroke();
context2d.fill();
}
}
}
context2d.fillStyle="grey";
for(var x=0; x<8; x++){
for(var y=5; y<8; y++){
if(((x+y)%2)==1){
context2d.beginPath();
context2d.moveTo(x*80+5, y*80+40);
context2d.arc(x*80+40, y*80+40, 30, 0, 2*Math.PI);
context2d.lineWidth=15;
context2d.strokeStyle="#B6B6B4";
context2d.stroke();
context2d.fill();
}
}
}
}
</script>
谢谢你的帮助
1 回答
You can listen for mousedown and mouseup events on the canvas like this:
And you can respond to mouse events like this:
Here's a Demo: http://jsfiddle.net/m1erickson/tP3m4/