TB爱JN
2016-03-22 20:24
function canvas () { var canvas=document.getElementById('canvas'); var ctx=canvas.getContext("2d"); canvas.width=800; canvas.height=800; for (var j = 0; j < 4; j++) { for (var i = 0; i < 4; i++) { fillRoundRect(ctx,170+i*120,170+j*120,100,100,6,"#ccc0b3"); } } } function fillRoundRect(ctx,x,y,width,height,r,fillColor) { if (2*r>width || 2*r>height ) { return } ctx.save(); ctx.translate(x, y); pathRoundRect(ctx,width,height,r) ctx.fillStyle = fillColor || "black"; ctx.fill(); ctx.restore(); } function pathRoundRect(ctx,width,height,r) { ctx.arc(width-r, r, r, 1.5*Math.PI,2*Math.PI ,false); ctx.lineTo(width, height-r); ctx.arc(width-r, height-r, r, 0, 0.5*Math.PI); ctx.lineTo(r, height); ctx.arc(r, height-r, r, 0.5*Math.PI, 1*Math.PI); ctx.lineTo(0, r); ctx.arc(r, r, r, Math.PI, 1.5*Math.PI); ctx.closePath(); ctx.restore(); } addOnload(canvas);
function pathRoundRect(ctx,width,height,r) { ctx.beginPath(); //少了一个 }
Canvas绘图详解
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