0
我的畫布中有多個圖像。我有一個大的形象,在這個我有其他的圖像。我拿着這個fiddle example。Canvas HTML5在多個圖像上單擊事件
var canvas = document.getElementById("canvas");
var ctx = canvas.getContext("2d");
var img1 = loadImage('http://upload.wikimedia.org/wikipedia/en/2/24/Lenna.png', main);
var img2 = loadImage('http://introcs.cs.princeton.edu/java/31datatype/peppers.jpg', main);
var imagesLoaded = 0;
function main() {
imagesLoaded += 1;
if(imagesLoaded == 2) {
// composite now
ctx.drawImage(img1, 0, 0);
ctx.globalAlpha = 0.5;
ctx.drawImage(img2, 0, 0);
}
}
function loadImage(src, onload) {
// http://www.thefutureoftheweb.com/blog/image-onload-isnt-being- called
var img = new Image();
img.onload = onload;
img.src = src;
return img;
}
畫布HTML5對我來說是全新的。那麼如何在畫布中的每個圖像上設置點擊事件?