我正在尝试绘制不同颜色的6X6正方形.但新颜色压倒了旧颜色.我想为每个广场添加eventhandler.
<canvas id="myCanvas" width="3000" height="1500" style="border:1px solid #d3d3d3;">
Your browser does not support the HTML5 canvas tag.</canvas>
JavaScript的:
var xPoint = 30;
var yPoint = 30;
var c = document.getElementsByTagName('canvas')[0];
var ctx = c.getContext("2d");
for(var i =1; i<=6;i++)
{
var tyPoint = yPoint * i;
for(var j=1;j<=6;j++)
{
var txPoint = xPoint * j;
var colorcode = CalculateHEX();
ctx.beginPath();
ctx.fillStyle = colorcode ;
ctx.rect(20, 20, txPoint , tyPoint );
ctx.fill();
ctx.stroke();
ctx.closePath();
}
}
function CalculateHEX()
{
alert('HEX');
var rgbCode ="#";
for(var c = 0;c< 3;c++)
{
var y = Math.floor((Math.random() * 255) + 1);
rgbCode = rgbCode + Number(y).toString(16);
}
return rgbCode;
}
这是fiddle.
最佳答案 您混淆了
rect
方法中参数的顺序.它应该是:
ctx.rect(txPoint, tyPoint, 20, 20);
前两个参数是矩形左上角的x和y坐标,其余是矩形宽度和高度.