DriverCenteredCharacterRaster.java

/* ========================================================================
 * PlantUML : a free UML diagram generator
 * ========================================================================
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 * (C) Copyright 2009-2025, Arnaud Roques
 *
 * Project Info:  https://plantuml.com
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 * Original Author:  Arnaud Roques
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package net.sourceforge.plantuml.klimt.drawing.raster;

import net.sourceforge.plantuml.klimt.UParam;
import net.sourceforge.plantuml.klimt.color.ColorMapper;
import net.sourceforge.plantuml.klimt.drawing.UDriver;
import net.sourceforge.plantuml.klimt.font.UFont;
import net.sourceforge.plantuml.klimt.shape.UCenteredCharacter;

/**
 * As {@code DriverCenteredCharacterG2d}, without {@code UnusedSpace} (which
 * needs AWT to rasterize the glyph): the glyph is centered on the box of its
 * ink, given by the canvas.
 *
 * <p>
 * UnusedSpace centers the smallest circle around the ink pixels of the glyph
 * drawn at integer coordinates: for one glyph, that is about the center of its
 * ink box minus half a pixel. Then DriverCenteredCharacterG2d draws at (x -
 * centerX, y - centerY - 0.5), that is (x - boxCenterX + 0.5, y - boxCenterY).
 */
public class DriverCenteredCharacterRaster implements UDriver<UCenteredCharacter, RasterCanvas> {

	@Override
	public void draw(UCenteredCharacter shape, double x, double y, ColorMapper mapper, UParam param,
			RasterCanvas canvas) {
		final String text = "" + shape.getChar();
		final UFont font = shape.getFont();
		final double[] ink = canvas.getInkBounds(text, font);
		final double centerX = ink[0] + ink[2] / 2;
		final double centerY = ink[1] + ink[3] / 2;

		canvas.setColor(RasterPaints.argb(param.getColor(), mapper));
		canvas.drawString(text, font, x - centerX + 0.5, y - centerY, 0);
	}

}