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add example

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michuNEEO 2015-09-13 14:56:07 +02:00
parent 4428bba483
commit 780a796de3
1 changed files with 43 additions and 0 deletions
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examples/writePng.js Normal file
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var fs = require('fs');
var PNG = require("../lib/png").PNG;
var w = 320;
var h = 200;
var bitmapWithoutAlpha = new Buffer(w * h * 3);
var ofs=0;
for (var i = 0; i < bitmapWithoutAlpha.length; i+=3) {
bitmapWithoutAlpha[ofs++] = 0xff;
bitmapWithoutAlpha[ofs++] = i % 0xff;
bitmapWithoutAlpha[ofs++] = (i/3) % 0xff;
}
var png = new PNG({
width: w,
height:h,
bitDepth: 8,
colorType: 2
});
png.data = bitmapWithoutAlpha;
png.pack().pipe(fs.createWriteStream('colortype2.png'));
bitmapWithoutAlpha = new Buffer(w * h * 4);
ofs=0;
for (var i = 0; i < bitmapWithoutAlpha.length; i+=4) {
bitmapWithoutAlpha[ofs++] = 0xff;
bitmapWithoutAlpha[ofs++] = i % 0xff;
bitmapWithoutAlpha[ofs++] = (i/4) % 0xff;
bitmapWithoutAlpha[ofs++] = 0xff;
}
var png = new PNG({
width: w,
height:h,
bitDepth: 8,
colorType: 6
});
png.data = bitmapWithoutAlpha;
png.pack().pipe(fs.createWriteStream('colortype6.png'));