Som*_*ody 3 crop image-processing
是否可以在客户端PC上使用客户端选择的图像而无需将图像上载到服务器.
如果是,那么哪种Web编程语言可以做到这一点？
您可以使用HTML5 Canvas,无需使用插件等.
加载图像,更改画布大小和绘制图像.也可以将结果提取为dataUrl.
<!DOCTYPE HTML>
<html>
<head>
<style>
body { margin: 0px; padding: 0px; }
</style>
</head>
<body>
<canvas id="myCanvas" width="578" height="200"></canvas>
<script>
var canvas = document.getElementById('myCanvas');
var context = canvas.getContext('2d');
var imageObj = new Image();
imageObj.onload = function() {
// draw cropped image
var sourceX = 150;
var sourceY = 0;
var sourceWidth = 150;
var sourceHeight = 150;
var destWidth = sourceWidth;
var destHeight = sourceHeight;
var destX = canvas.width / 2 - destWidth / 2;
var destY = canvas.height / 2 - destHeight / 2;
context.drawImage(imageObj, sourceX, sourceY, sourceWidth, sourceHeight, destX, destY, destWidth, destHeight);
};
imageObj.src = 'http://www.html5canvastutorials.com/demos/assets/darth-vader.jpg';
</script>
</body>
</html>
所有功劳归功于:
http://www.html5canvastutorials.com/tutorials/html5-canvas-image-crop/