Cancel the effects of the zoom on a particular Stroke : Stroke « 2D Graphics GUI « Java

Cancel the effects of the zoom on a particular Stroke

 * Created on Aug 30, 2007, 11:40:18 AM
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//Revised from jaspersoft ireport designer

import java.awt.BasicStroke;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Rectangle;
import java.awt.Shape;
import java.awt.Stroke;
import java.awt.geom.AffineTransform;
import java.util.Stack;

 * @author gtoffoli
public class Java2DUtils

   * This function provides a way to cancel the effects of the zoom on a particular Stroke.
   * All the stroke values (as line width, dashes, etc...) are divided by the zoom factor.
   * This allow to have essentially a fixed Stroke independent by the zoom.
   * The returned Stroke is a copy.
   * Remember to restore the right stroke in the graphics when done.
   * It works only with instances of BasicStroke
   * zoom is the zoom factor.
  public static Stroke getInvertedZoomedStroke(Stroke stroke, double zoom)
            if (stroke == null || !(stroke instanceof BasicStroke )) return stroke;
            BasicStroke bs = (BasicStroke)stroke;
            float[] dashArray = bs.getDashArray();
            float[] newDashArray = null;
            if (dashArray != null)
                newDashArray = new float[dashArray.length];
                for (int i=0; i<newDashArray.length; ++i)
                    newDashArray[i] = (float)(dashArray[i] / zoom);
            BasicStroke newStroke = new BasicStroke(       
                            (float)(bs.getLineWidth() / zoom),
                            //(float)(bs.getMiterLimit() / zoom),
                            (float)(bs.getDashPhase() / zoom)
            return newStroke;


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