StringBounderFromWidthTable.java

/* ========================================================================
 * PlantUML : a free UML diagram generator
 * ========================================================================
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 * (C) Copyright 2009-2024, Arnaud Roques
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package net.sourceforge.plantuml.klimt.drawing.font;

import net.sourceforge.plantuml.FileFormat;
import net.sourceforge.plantuml.klimt.font.StringBounder;
import net.sourceforge.plantuml.klimt.font.UFont;
import net.sourceforge.plantuml.klimt.font.UFontContext;
import net.sourceforge.plantuml.klimt.geom.XDimension2D;

public class StringBounderFromWidthTable implements StringBounder {

	private static final UnicodeBlock[] BLOCKS = new UnicodeBlock[UnicodeFontWidthSansSerif.SANS_SERIF.length];

	private final FileFormat fileFormat;

	public StringBounderFromWidthTable(FileFormat fileFormat) {
		this.fileFormat = fileFormat;
	}

	private static UnicodeBlock getBlock(int block) {
		if (BLOCKS[block] == null)
			BLOCKS[block] = new UnicodeBlock(UnicodeFontWidthSansSerif.SANS_SERIF[block]);
		return BLOCKS[block];
	}

	@Override
	public FileFormat getFileFormat() {
		return fileFormat;
	}

	private static final double REFERENCE_SIZE = 16.0;

	@Override
	public XDimension2D calculateDimension(UFont font, String text) {
		final String family = font.getFamily(text, UFontContext.SVG);
		final double size = font.getSize2D();
		final double factor = size / REFERENCE_SIZE;
		final double height = size;
		double width = 0;
		for (int i = 0; i < text.length();) {
			final int cp = text.codePointAt(i);
			width += getCharWidth(font, cp);
			i += Character.charCount(cp);
		}

		return new XDimension2D(width * factor, height);
	}

	private double getCharWidth(UFont font, int cp) {
		if (cp >= 0xFFFF)
			return 16;
		final int block = (cp >> 8) & 0xFF;
		if (block >= BLOCKS.length)
			return 13;
		return getBlock(block).getWidth((char) cp);
	}

}