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https://github.com/csharpee/Map-Projections.git
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81 lines
2.3 KiB
Java
81 lines
2.3 KiB
Java
/**
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* MIT License
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*
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* Copyright (c) 2017 Justin Kunimune
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in all
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* copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*/
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package image;
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import java.awt.Transparency;
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import java.awt.image.BufferedImage;
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import java.awt.image.WritableRaster;
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import java.io.File;
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import java.io.IOException;
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import javax.imageio.ImageIO;
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/**
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* An input equirectangular map based on a raster image file
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*
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* @author jkunimune
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*/
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public class PixelMap {
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private final BufferedImage pixels;
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private final WritableRaster alphaPixels;
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public PixelMap(File f) throws IOException {
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pixels = ImageIO.read(f);
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alphaPixels = pixels.getAlphaRaster();
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}
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public int getWidth() {
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return this.pixels.getWidth();
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}
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public int getHeight() {
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return this.pixels.getHeight();
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}
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public int getArgb(double lat, double lon) {
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double x = 0.5 + lon/(2*Math.PI);
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x = (x - Math.floor(x)) * pixels.getWidth();
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double y = pixels.getHeight()*(.5 - lat/Math.PI);
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if (y < 0)
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y = 0;
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else if (y >= pixels.getHeight())
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y = pixels.getHeight() - 1;
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int alpha;
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if (pixels.getTransparency() != Transparency.OPAQUE)
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alpha = alphaPixels.getPixel((int) x, (int) y, new int[1])[0];
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else
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alpha = 0xFF;
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int rgb = pixels.getRGB((int) x, (int) y);
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return (alpha << 24) | rgb;
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}
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}
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