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package net.sourceforge.plantuml.klimt.compress;

import net.sourceforge.plantuml.activitydiagram3.ftile.CenteredText;
import net.sourceforge.plantuml.klimt.UBackground;
import net.sourceforge.plantuml.klimt.UChange;
import net.sourceforge.plantuml.klimt.UShape;
import net.sourceforge.plantuml.klimt.UStroke;
import net.sourceforge.plantuml.klimt.UTranslate;
import net.sourceforge.plantuml.klimt.color.HColor;
import net.sourceforge.plantuml.klimt.drawing.UGraphic;
import net.sourceforge.plantuml.klimt.drawing.UGraphicDelegator;
import net.sourceforge.plantuml.klimt.shape.TextBlock;
import net.sourceforge.plantuml.klimt.shape.ULine;
import net.sourceforge.plantuml.klimt.shape.URectangle;

public class UGraphicCompressOnXorY extends UGraphicDelegator {
    // ::remove file when __HAXE__

	public UGraphic apply(UChange change) {
		if (change instanceof UTranslate)
			return new UGraphicCompressOnXorY(mode, getUg(), compressionTransform,
					translate.compose((UTranslate) change));
		else if (change instanceof UStroke || change instanceof UBackground || change instanceof HColor)
			return new UGraphicCompressOnXorY(mode, getUg().apply(change), compressionTransform, translate);

		throw new UnsupportedOperationException();
	}

	private final CompressionMode mode;
	private final PiecewiseAffineTransform compressionTransform;
	private final UTranslate translate;

	@Override
	public String toString() {
		return "UGraphicCompressOnXorY " + mode;
	}

	public static UGraphicCompressOnXorY create(CompressionMode mode, UGraphic ug,
			PiecewiseAffineTransform compressionTransform) {
		return new UGraphicCompressOnXorY(mode, ug, compressionTransform, UTranslate.none());
	}

	private UGraphicCompressOnXorY(CompressionMode mode, UGraphic ug, PiecewiseAffineTransform compressionTransform,
			UTranslate translate) {
		super(ug);
		this.mode = mode;
		this.compressionTransform = compressionTransform;
		this.translate = translate;
	}

	public void draw(UShape shape) {
		final double x = translate.getDx();
		final double y = translate.getDy();
		if (shape instanceof URectangle) {
			final URectangle rect = (URectangle) shape;
			if (mode == CompressionMode.ON_X) {
				final double x2 = ct(x + rect.getWidth());
				shape = rect.withWidth(x2 - ct(x));
			} else {
				final double y2 = ct(y + rect.getHeight());
				shape = rect.withHeight(y2 - ct(y));
			}
		}
		if (shape instanceof CenteredText) {
			final CenteredText centeredText = (CenteredText) shape;
			final TextBlock text = centeredText.getText();
			final double totalWidth = centeredText.getTotalWidth();
			final double realSpaceWidth;
			if (mode == CompressionMode.ON_X)
				realSpaceWidth = ct(x + totalWidth) - ct(x);
			else
				realSpaceWidth = totalWidth;

			final double textWidth = text.calculateDimension(getStringBounder()).getWidth();
			final double pos = (realSpaceWidth - textWidth) / 2;
			text.drawU(getUg().apply(getTranslate(x, y)).apply(UTranslate.dx(pos)));
			return;
		}
		if (shape instanceof ULine)
			drawLine(x, y, (ULine) shape);
		else
			getUg().apply(getTranslate(x, y)).draw(shape);

	}

	private UTranslate getTranslate(final double x, final double y) {
		if (mode == CompressionMode.ON_X)
			return new UTranslate(ct(x), y);
		else
			return new UTranslate(x, ct(y));

	}

	private void drawLine(double x, double y, ULine shape) {
		if (mode == CompressionMode.ON_X)
			drawLine(ct(x), y, ct(x + shape.getDX()), y + shape.getDY());
		else
			drawLine(x, ct(y), x + shape.getDX(), ct(y + shape.getDY()));

	}

	private double ct(double v) {
		return compressionTransform.transform(v);
	}

	private void drawLine(double x1, double y1, double x2, double y2) {
		if (y1 > y2) {
			drawLine(x2, y2, x1, y1);
			return;
		}
		assert y1 <= y2;
		getUg().apply(new UTranslate(x1, y1)).draw(new ULine(x2 - x1, y2 - y1));
	}

}




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