CSBoundingBoxCollector.java :  » PDF » jPod » de » intarsys » pdf » content » common » Java Open Source

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

package de.intarsys.pdf.content.common;

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

import de.intarsys.pdf.content.CSException;
import de.intarsys.pdf.content.CSShapeDevice;
import de.intarsys.pdf.content.ICSInterpreter;
import de.intarsys.pdf.cos.COSName;
import de.intarsys.pdf.pd.PDImage;
import de.intarsys.tools.geometry.GeometryTools;

/**
 * Determine the bounding box of the content streams graphic primitives.
 * <p>
 * Usage <br>
 * <code>
 CSBoundingBoxCollector bbCollector = new CSBoundingBoxCollector();
 CSDeviceBasedInterpreter interpreter = new CSDeviceBasedInterpreter(null, bbCollector);
 interpreter.process(content, getResources());
 if (bbCollector.getBoundingBox() != null) {
 ...
 }
 * </code>
 * </p>
 * ATTENTION: The {@link CSBoundingBoxCollector} does not take care of text yet !!
 * 
 */
public class CSBoundingBoxCollector extends CSShapeDevice {

  private Rectangle2D boundingBox;

  private Area clip;

  public CSBoundingBoxCollector() {
    super();
  }

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

  protected void doImage(COSName name, PDImage image) throws CSException {
    Area shapeArea = new Area(new Rectangle2D.Double(0, 0, 1, 1));
    shapeArea.transform(graphicsState.getTransform());
    addBoundingBox(shapeArea.getBounds2D(), false);
  }

  protected void basicClip(Shape shape) {
    Area tempArea = new Area(shape.getBounds2D());
    tempArea.transform(graphicsState.getTransform());
    if (clip == null) {
      clip = tempArea;
    } else {
      clip.intersect(tempArea);
    }
  }

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

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

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

  /*
   * (non-Javadoc)
   * 
   * @see de.intarsys.pdf.content.CSDeviceAdapter#open(de.intarsys.pdf.content.ICSInterpreter)
   */
  public void open(ICSInterpreter pInterpreter) {
    super.open(pInterpreter);
    graphicsState.setTransform(new AffineTransform());
  }

  public void saveState() {
    if (clip != null) {
      graphicsState.setClip((Area) clip.clone());
    }
    super.saveState();
  }

  public void restoreState() {
    super.restoreState();
    clip = (Area) graphicsState.getClip();
  }

  public void transform(float a, float b, float c, float d, float e, float f) {
    AffineTransform transform = new AffineTransform(a, b, c, d, e, f);
    transform.preConcatenate(graphicsState.getTransform());
    graphicsState.setTransform(transform);
  }
}