如何使用phonegap在图像中添加水印 [英] How to add watermark in image using phonegap
本文介绍了如何使用phonegap在图像中添加水印的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
Iam试图在我的图片上添加水印。我使用下面但是我刚接触到phonegap.Please帮我在图像上添加水印...
Hi,
Iam trying to add watermark on my image.I have using below but iam new to phonegap.Please help me to add watermark on images...
<!DOCTYPE html>
<html>
<head>
<title>Capture Photo</title>
<script type="text/javascript" charset="utf-8" src="phonegap-1.2.0.js"></script>
<script type="text/javascript" charset="utf-8">
var pictureSource; // picture source
var destinationType; // sets the format of returned value
// Wait for PhoneGap to connect with the device
//
document.addEventListener("deviceready",onDeviceReady,false);
// PhoneGap is ready to be used!
//
function onDeviceReady() {
pictureSource=navigator.camera.PictureSourceType;
destinationType=navigator.camera.DestinationType;
}
// Called when a photo is successfully retrieved
//
function onPhotoDataSuccess(imageData) {
// Uncomment to view the base64 encoded image data
// console.log(imageData);
// Get image handle
//
var smallImage = document.getElementById('smallImage');
// Unhide image elements
//
smallImage.style.display = 'block';
// Show the captured photo
// The inline CSS rules are used to resize the image
//
smallImage.src = "data:image/jpeg;base64," + imageData;
}
// Called when a photo is successfully retrieved
//
function onPhotoURISuccess(imageURI) {
// Uncomment to view the image file URI
// console.log(imageURI);
// Get image handle
//
var largeImage = document.getElementById('largeImage');
// Unhide image elements
//
largeImage.style.display = 'block';
// Show the captured photo
// The inline CSS rules are used to resize the image
//
largeImage.src = imageURI;
}
// A button will call this function
//
function capturePhoto() {
// Take picture using device camera and retrieve image as base64-encoded string
navigator.camera.getPicture(onPhotoDataSuccess, onFail, { quality: 50 });
}
// A button will call this function
//
function capturePhotoEdit() {
// Take picture using device camera, allow edit, and retrieve image as base64-encoded string
navigator.camera.getPicture(onPhotoDataSuccess, onFail, { quality: 20, allowEdit: true });
}
// A button will call this function
//
function getPhoto(source) {
// Retrieve image file location from specified source
navigator.camera.getPicture(onPhotoURISuccess, onFail, { quality: 50,
destinationType: destinationType.FILE_URI,
sourceType: source });
}
// Called if something bad happens.
//
function onFail(message) {
alert('Failed because: ' + message);
}
var button = document.getElementById('capture');
button.addEventListener('click', camera);
var canvas = document.getElementById('myCanvas');
var context = canvas.getContext('2d');
function camera() {
function onSuccess(imageData) {
var image = new Image();
image.src = "data:image/jpeg;base64," + imageData;
img.onload = function(e) {
canvasDom.width=2048;
canvasDom.height=1536;
canvas.drawImage(img,0,0);
canvas.drawImage(watermark, canvasDom.width-watermark.width, canvasDom.height-watermark.height);
}
}
function onFail(message) {
console.log('Failed because: ' + message);
}
navigator.camera.getPicture(onSuccess, onFail, {
quality: 50,
destinationType: Camera.DestinationType.DATA_URL
});
}
</script>
</head>
<body>
<button onclick="capturePhoto();">Capture Photo</button> <br>
<button onclick="capturePhotoEdit();">Capture Editable Photo</button> <br>
<button onclick="getPhoto(pictureSource.PHOTOLIBRARY);">From Photo Library</button><br>
<button onclick="getPhoto(pictureSource.SAVEDPHOTOALBUM);">From Photo Album</button><br>
<img style="display:none;width:60px;height:60px;" id="smallImage" src="" />
<h1>Watermark Camera</h1>
<button id="capture" onclick="camera();">Capture Photo</button>
<br>
<p>Canvas:</p>
<canvas id="myCanvas">Your browser doesn't support me!</canvas>
<img style="display:none;" id="largeImage" src="" />
</body>
</html>
推荐答案
参考：创建水印图像-in-PhoneGap [ ^ ]
这篇关于如何使用phonegap在图像中添加水印的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
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