是否有可能在客户端PC上使用由客户选择的图像而无需将图像上传到服务器。
如果是,哪种Web编程语言可以做到这一点?
是否有可能在客户端PC上使用由客户选择的图像而无需将图像上传到服务器。
如果是,哪种Web编程语言可以做到这一点?
<!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>
所有信用归属于:
http://www.html5canvastutorials.com/tutorials/html5-canvas-image-crop/
这也可以使用JavaScript库,如jQuery、MooTools、Prototype和script.aculo.us来完成:
http://www.bitrepository.com/image-cropping-with-jquery-mootools-prototype-scriptaculous.html
Flash
、Silverlight
或者一个自定义的 Plugin/ActiveX
来完成,具体取决于目标浏览器。