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

package de.intarsys.pdf.content.common;

import java.awt.geom.Rectangle2D;

import de.intarsys.pdf.cds.CDSMatrix;
import de.intarsys.pdf.cds.CDSRectangle;
import de.intarsys.pdf.content.CSContent;
import de.intarsys.pdf.content.CSDeviceBasedInterpreter;
import de.intarsys.pdf.cos.COSObject;
import de.intarsys.pdf.pd.PDForm;
import de.intarsys.pdf.pd.PDPage;
import de.intarsys.pdf.pd.PDResources;

/**
 * A collection of tools to work with page content.
 */
public class CSContentTools {

  /**
   * Get the rectangle containing all graphics artifacts on the page (stemming
   * from the content stream).
   * 
   * @param page
   *            The page whose content is evaluated.
   * @param border
   *            A border width to be added to the clipping rectangle.
   * 
   * @return Get the rectangle containing all graphics artifacts on the page
   *         (stemming from the content stream).
   */
  public static Rectangle2D getBoundingBoxClipped(PDPage page, double border) {
    CSBoundingBoxCollector bbCollector = new CSBoundingBoxCollector();
    CSDeviceBasedInterpreter interpreter = new CSDeviceBasedInterpreter(
        null, bbCollector);
    CSContent content = page.getContentStream();
    interpreter.process(content, page.getResources());
    if (bbCollector.getBoundingBox() != null) {
      return bbCollector.getBoundingBox();
    } else {
      return page.getCropBox().toNormalizedRectangle();
    }
  }

  /**
   * Get a {@link PDForm} containing all graphics artifacts on the page
   * (stemming from the content stream).
   * 
   * @param page
   *            The page whose content is evaluated.
   * @param border
   *            A border width to be added to the clipping rectangle.
   * 
   * @return Get a {@link PDForm} containing all graphics artifacts on the
   *         page (stemming from the content stream).
   */
  public static PDForm getFormClipped(PDPage page, double border) {
    COSObject cosResources = page.getResources().cosGetObject().copyDeep();
    PDResources resources = (PDResources) PDResources.META
        .createFromCos(cosResources);
    CSContent content = page.getContentStream();
    PDForm form = (PDForm) PDForm.META.createNew();
    form.setBytes(content.toByteArray());
    form.setResources(resources);
    Rectangle2D rect = CSContentTools.getBoundingBoxClipped(page, border);
    CDSRectangle bbox = new CDSRectangle(rect);
    form.setBoundingBox(bbox);
    CDSMatrix matrix = new CDSMatrix();
    matrix.translate(-bbox.getLowerLeftX(), -bbox.getLowerLeftY());
    // int rotation = PDFGeometryTools.normalizeRotation(page.getRotate());
    // if (rotation == 0) {
    // } else if (rotation == 90) {
    // matrix.rotate(Math.toRadians(-90));
    // } else if (rotation == 180) {
    // matrix.rotate(Math.toRadians(-180));
    // } else if (rotation == 270) {
    // matrix.rotate(Math.toRadians(-270));
    // } else {
    // }
    form.setMatrix(matrix);
    return form;
  }
}