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remove useless code

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tengge 2020-08-04 20:14:51 +08:00
parent d74418023f
commit fc44c31f2f
1 changed files with 0 additions and 45 deletions
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45
web/src/gis/layer/MercatorTiledImageLayer.js
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@ -47,20 +47,6 @@ function MercatorTiledImageLayer(sector, levelZeroDelta, numLevels, imageFormat,
tileWidth, tileHeight) {
TiledImageLayer.call(this,
sector, levelZeroDelta, numLevels, imageFormat, cachePath, tileWidth, tileHeight);
this.detectBlankImages = false;
// These pixels are tested in retrieved images to determine whether the image is blank.
this.testPixels = [
new Vec2(20, 20),
new Vec2(235, 20),
new Vec2(20, 235),
new Vec2(235, 235)
];
// Create a canvas we can use when unprojecting retrieved images.
this.destCanvas = document.createElement("canvas");
this.destContext = this.destCanvas.getContext("2d");
}
MercatorTiledImageLayer.prototype = Object.create(TiledImageLayer.prototype);
@ -78,35 +64,4 @@ MercatorTiledImageLayer.prototype.createTile = function (sector, level, row, col
return TiledImageLayer.prototype.createTile.call(this, sector, level, row, column);
};
// Overridden from TiledImageLayer to unproject the retrieved image prior to creating a texture for it.
MercatorTiledImageLayer.prototype.createTexture = function (dc, tile, image) {
return TiledImageLayer.prototype.createTexture.call(this, dc, tile, image);
};
// Determines whether a retrieved image is blank.
MercatorTiledImageLayer.prototype.isBlankImage = function (image, srcImageData) {
var pixel, k, pixelValue = null;
for (var i = 0, len = this.testPixels.length; i < len; i++) {
pixel = this.testPixels[i];
k = 4 * (pixel[0] + pixel[1] * image.width);
if (!pixelValue) {
pixelValue = [
srcImageData.data[k],
srcImageData.data[k + 1],
srcImageData.data[k + 2]
];
} else {
if (srcImageData.data[k] != pixelValue[0]
|| srcImageData.data[k + 1] != pixelValue[1]
|| srcImageData.data[k + 2] != pixelValue[2]) {
return false;
}
}
}
return true;
};
export default MercatorTiledImageLayer;