使用 HTML5 检测单击贝塞尔曲线路径形状
要在单击时检测Bezier路径形状，请尝试以下代码-
示例
var l = boxes.length;
for (var i = l-1; i >= 0; i--) {
drawshape(gctx, boxes[i], 'black', 'black');
var imgData = gctx.getImageData(mx, my, 1, 1);
var index = (mx + my * imgData.width) * 4;
if (imgData.data[3] > 0) {
mySel = boxes[i];
offsetx = mx - mySel.x;
offsety = my - mySel.y;
mySel.x= mx - offsetx;
mySel.y= my - offsety;
isDrag = true;
canvas.onmousemove= myMove;
invalidate();
clear(gctx);
return;
}
}