通过Javascript将图像切割成碎片

Question

我正在创建一个简单的拼图游戏.为了做到这一点,我需要将我使用的图片切成20块.有没有办法在Javascript中将图片分割成20个相等的部分,并将它们保存为网页中的20个不同的对象？或者我是否只需要进入photoshop并自己剪切每张照片并将其调用？

Answer 1

这对Canvas来说很容易.一般的想法是:

var image = new Image();
image.onload = cutImageUp;
image.src = 'myimage.png';

function cutImageUp() {
    var imagePieces = [];
    for(var x = 0; x < numColsToCut; ++x) {
        for(var y = 0; y < numRowsToCut; ++y) {
            var canvas = document.createElement('canvas');
            canvas.width = widthOfOnePiece;
            canvas.height = heightOfOnePiece;
            var context = canvas.getContext('2d');
            context.drawImage(image, x * widthOfOnePiece, y * heightOfOnePiece, widthOfOnePiece, heightOfOnePiece, 0, 0, canvas.width, canvas.height);
            imagePieces.push(canvas.toDataURL());
        }
    }

    // imagePieces now contains data urls of all the pieces of the image

    // load one piece onto the page
    var anImageElement = document.getElementById('myImageElementInTheDom');
    anImageElement.src = imagePieces[0];
}

Answer 2

您可以通过将图像设置为div上的背景,然后设置其背景位置来完成此操作.这与使用CSS Sprites基本相同.

(假设件数为100 x 100px)

<div class="puzzle piece1"></div>
<div class="puzzle piece2"></div>

CSS:

.puzzle {
   background-image:url(/images/puzzle.jpg);
   width:100px;
   height:100px;
}

.piece1 {
   background-position:0 0
}

.piece2 {
   background-position:-100px -100px
}