Tool to aid the placement of structures on sites such as r/place. Syntax: `java CoordinatesProcessor.java <inputFile> <leftX> <upperY>`

CoordinatesProcessor.java

import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics2D;
import java.awt.font.GlyphVector;
import java.awt.image.BufferedImage;
import java.io.File;

import javax.imageio.ImageIO;

public class CoordinatesProcessor {

    private static final int gridMargin = 1;
    private static final int gridZoom = 40;
    private static final int pixelSize = gridZoom + gridMargin * 2;
    private static final int writeOffset = 2;

    public static void main(String[] args) throws Exception {
        BufferedImage image = ImageIO.read(new File(args[0]));
        int xb = Integer.valueOf(args[1]);
        int yb = Integer.valueOf(args[2]);

        BufferedImage out = new BufferedImage(image.getWidth() * pixelSize, image.getHeight() * pixelSize, image.getType());
        Font font = Font.decode("SansSerif");

        Graphics2D g2d = out.createGraphics();
        for (int x = 0; x < image.getWidth(); x++) {
            for (int y = 0; y < image.getHeight(); y++) {
                if (image.getColorModel().getAlpha(image.getRaster().getDataElements(x, y, null)) > 127) {
                    g2d.setPaint(Color.GREEN);
                    g2d.fillRect(x * pixelSize, y * pixelSize, pixelSize, pixelSize);
                    int colorRGB = image.getRGB(x, y);
                    Color color = new Color(colorRGB);
                    g2d.setPaint(color);
                    g2d.fillRect(x * pixelSize + gridMargin, y * pixelSize + gridMargin, gridZoom, gridZoom);
                    if (color.getBlue() < 25 && color.getRed() < 25 && color.getGreen() < 25) {
                        g2d.setPaint(Color.WHITE);
                    } else {
                        g2d.setPaint(Color.BLACK);
                    }
                    GlyphVector xString = font.createGlyphVector(g2d.getFontRenderContext(), Integer.toString(xb + x));
                    g2d.drawGlyphVector(xString, x * pixelSize + gridMargin + writeOffset, y * pixelSize + gridMargin + writeOffset + (int) xString.getLogicalBounds().getHeight());
                    GlyphVector yString = font.createGlyphVector(g2d.getFontRenderContext(), Integer.toString(yb + y));
                    g2d.drawGlyphVector(yString, x * pixelSize + gridMargin + writeOffset, y * pixelSize + gridMargin + 2 * writeOffset + (int) xString.getLogicalBounds().getHeight() + (int) yString.getLogicalBounds().getHeight());
                } else {
                    g2d.setPaint(new Color(0, 0, 0, 0));
                    g2d.fillRect(x * pixelSize, y * pixelSize, pixelSize, pixelSize);
                }
            }
        }

        ImageIO.write(out, "png", new File("output.png"));
    }
}