de.intarsys.pdf.content.common.CSBoundingBoxCollector Maven / Gradle / Ivy

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/*
 * intarsys consulting gmbh
 * all rights reserved
 *
 */

package de.intarsys.pdf.content.common;

import java.awt.Shape;
import java.awt.geom.Area;
import java.awt.geom.Rectangle2D;

import de.intarsys.pdf.content.CSBasicDevice;
import de.intarsys.pdf.content.CSException;
import de.intarsys.pdf.cos.COSName;
import de.intarsys.pdf.font.PDGlyphs;
import de.intarsys.pdf.pd.PDImage;
import de.intarsys.tools.geometry.GeometryTools;

/**
 * Determine the bounding box of the content streams graphic primitives.
 * 
 * Usage 

 * 
 CSBoundingBoxCollector bbCollector = new CSBoundingBoxCollector();
 CSDeviceBasedInterpreter interpreter = new CSDeviceBasedInterpreter(null, bbCollector);
 interpreter.process(content, getResources());
 if (bbCollector.getBoundingBox() != null) {
 ...
 }
 * 
 * 
 * ATTENTION: The {@link CSBoundingBoxCollector} does not take care of text yet !!
 * 
 */
public class CSBoundingBoxCollector extends CSBasicDevice {

	private Rectangle2D boundingBox;

	public CSBoundingBoxCollector() {
		super();
	}

	protected void addBoundingBox(Rectangle2D rect, boolean addLineWidth) {
		GeometryTools.normalizeRect(rect);
		if (addLineWidth) {
			double factor;
			factor = graphicsState.transform.getScaleX();
			factor = Math.max(graphicsState.transform.getScaleY(), factor);
			double border = graphicsState.lineWidth * factor + 5;
			rect.add(rect.getMinX() - border, rect.getMinY() - border);
			rect.add(rect.getMaxX() + border, rect.getMaxY() + border);
		}
		if (graphicsState.clip != null) {
			Area rectArea = new Area(rect);
			Area tempArea = new Area(graphicsState.clip);
			rectArea.intersect(tempArea);
			if (rectArea.isEmpty()) {
				return;
			}
			rect = rectArea.getBounds2D();
		}
		if (boundingBox == null) {
			boundingBox = (Rectangle2D) rect.clone();
		} else {
			boundingBox.add(rect);
		}
	}

	@Override
	protected void basicDraw(Shape shape) {
		Area area = new Area(shape.getBounds2D());
		area.transform(graphicsState.transform);
		addBoundingBox(area.getBounds2D(), true);
	}

	@Override
	protected void basicFill(Shape shape) {
		Area area = new Area(shape.getBounds2D());
		area.transform(graphicsState.transform);
		addBoundingBox(area.getBounds2D(), true);
	}

	@Override
	protected void basicTextShowGlyphs(PDGlyphs glyphs, float advance)
			throws CSException {
		double factor = textState.fontSize / 1000f;
		float x = 0;
		float y = (float) (glyphs.getDescent() * factor);
		float width = (float) (glyphs.getWidth() * factor);
		float height = (float) (glyphs.getAscent() * factor);
		Rectangle2D rect = new Rectangle2D.Float(x, y, width, height);
		Area area = new Area(rect);
		area.transform(textState.globalTransform);
		addBoundingBox(area.getBounds2D(), true);
		super.basicTextShowGlyphs(glyphs, advance);
	}

	@Override
	protected void doImage(COSName name, PDImage image) throws CSException {
		Area area = new Area(new Rectangle2D.Float(0, 0, 1, 1));
		area.transform(graphicsState.transform);
		addBoundingBox(area.getBounds2D(), false);
	}

	/**
	 * The bounding box containing all graphics artifacts stemming from
	 * operations in the content stream processed.
	 * 
	 * The result may be null.
	 * 
	 * @return The bounding box containing all graphics artifacts stemming from
	 *         operations in the content stream processed.
	 */
	public Rectangle2D getBoundingBox() {
		return boundingBox;
	}

}