net.sourceforge.plantuml.activitydiagram3.ftile.FtileMinWidthCentered Maven / Gradle / Ivy

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/* ========================================================================
 * PlantUML : a free UML diagram generator
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 * (C) Copyright 2009-2024, Arnaud Roques
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 * Project Info:  https://plantuml.com
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 * under the terms of the GNU General Public License as published by
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 * PlantUML distributed in the hope that it will be useful, but
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 * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
 * License for more details.
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 * You should have received a copy of the GNU General Public
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 * Original Author:  Arnaud Roques
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package net.sourceforge.plantuml.activitydiagram3.ftile;

import net.sourceforge.plantuml.activitydiagram3.ftile.vertical.FtileDecorate;
import net.sourceforge.plantuml.klimt.UTranslate;
import net.sourceforge.plantuml.klimt.drawing.UGraphic;
import net.sourceforge.plantuml.klimt.font.StringBounder;
import net.sourceforge.plantuml.klimt.geom.XDimension2D;

public class FtileMinWidthCentered extends FtileDecorate {

	private final double minWidth;
	private FtileGeometry calculateDimensionInternal;

	public FtileMinWidthCentered(Ftile tile, double minWidth) {
		super(tile);
		this.minWidth = minWidth;
	}

	public void drawU(UGraphic ug) {
		final StringBounder stringBounder = ug.getStringBounder();
		final UTranslate change = getUTranslateInternal(stringBounder);
		super.drawU(ug.apply(change));
	}

	@Override
	public FtileGeometry calculateDimension(StringBounder stringBounder) {
		if (calculateDimensionInternal == null) 
			calculateDimensionInternal = calculateDimensionSlow(stringBounder);
		
		return calculateDimensionInternal;
	}

	private FtileGeometry calculateDimensionSlow(StringBounder stringBounder) {
		final FtileGeometry geo = super.calculateDimension(stringBounder);
		final double left = getPoint2(geo.getLeft(), stringBounder);
		if (geo.hasPointOut() == false) 
			return new FtileGeometry(getDimensionInternal(stringBounder), left, geo.getInY());
		
		return new FtileGeometry(getDimensionInternal(stringBounder), left, geo.getInY(), geo.getOutY());
	}

	private XDimension2D getDimensionInternal(StringBounder stringBounder) {
		final XDimension2D dim = getFtileDelegated().calculateDimension(stringBounder);
		if (dim.getWidth() < minWidth) 
			return new XDimension2D(minWidth, dim.getHeight());
		
		return dim;
	}

	private UTranslate getUTranslateInternal(final StringBounder stringBounder) {
		final XDimension2D dimTile = getFtileDelegated().calculateDimension(stringBounder);
		final XDimension2D dimTotal = getDimensionInternal(stringBounder);
		final UTranslate change = UTranslate.dx((dimTotal.getWidth() - dimTile.getWidth()) / 2);
		return change;
	}

	public UTranslate getTranslateFor(Ftile child, StringBounder stringBounder) {
		if (child == getFtileDelegated()) 
			return getUTranslateInternal(stringBounder);
		
		return null;
	}

	private double getPoint2(double x, StringBounder stringBounder) {
		final XDimension2D dim = getFtileDelegated().calculateDimension(stringBounder);
		if (dim.getWidth() < minWidth) {
			final double diff = minWidth - dim.getWidth();
			return x + diff / 2;
		}
		return x;
	}

}