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test.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>Document</title>
</head>
<style>
html,
body {
width: 100%;
height: 100%;
}
body {
margin: 0;
padding: 0;
background-color: blue;
/*background: url("images/starry_sky_1.jpg");*/
background-size: cover;
background-repeat: no-repeat;
background-position: center center;
overflow: hidden;
}
</style>
<body>
<script>
var canvasResult = document.createElement('canvas')
canvasResult.width = 1024
canvasResult.height = 512
var contextResult = canvasResult.getContext('2d')
document.body.appendChild(canvasResult);
var imageMap = new Image();
imageMap.addEventListener("load", function () {
// create dataMap ImageData for earthcloudmap
var canvasMap = document.createElement('canvas')
canvasMap.width = imageMap.width
canvasMap.height = imageMap.height
var contextMap = canvasMap.getContext('2d')
contextMap.drawImage(imageMap, 0, 0)
var dataMap = contextMap.getImageData(0, 0, canvasMap.width, canvasMap.height)
console.log(dataMap);
contextResult.putImageData(dataMap, 0, 0)
// load earthcloudmaptrans
var imageTrans = new Image();
imageTrans.addEventListener("load", function () {
// create dataTrans ImageData for earthcloudmaptrans
var canvasTrans = document.createElement('canvas')
canvasTrans.width = imageTrans.width
canvasTrans.height = imageTrans.height
var contextTrans = canvasTrans.getContext('2d')
contextTrans.drawImage(imageTrans, 0, 0)
var dataTrans = contextTrans.getImageData(0, 0, canvasTrans.width, canvasTrans.height)
// merge dataMap + dataTrans into dataResult
var dataResult = contextMap.createImageData(canvasMap.width, canvasMap.height)
for (var y = 0, offset = 0; y < imageMap.height; y++) {
for (var x = 0; x < imageMap.width; x++, offset += 4) {
dataResult.data[offset + 0] = dataMap.data[offset + 0]
dataResult.data[offset + 1] = dataMap.data[offset + 1]
dataResult.data[offset + 2] = dataMap.data[offset + 2]
dataResult.data[offset + 3] = 255 - dataTrans.data[offset + 0]
}
}
// update texture with result
contextResult.putImageData(dataResult, 0, 0)
})
imageTrans.src = 'images/earthcloudmaptrans.jpg';
}, false);
imageMap.src = 'images/earthcloudmap.jpg';
</script>
</body>
</html>