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Java > Open Source Codes > org > ejtools > graph > renderer > DefaultGraphRenderer


1 /*
2  * EJTools, the Enterprise Java Tools
3  *
4  * Distributable under LGPL license.
5  * See terms of license at www.gnu.org.
6  */
7 package org.ejtools.graph.renderer;
8
9 import java.awt.Graphics JavaDoc;
10 import java.awt.Insets JavaDoc;
11
12 import org.ejtools.graph.GraphRenderer;
13
14 /**
15  * @author Laurent Etiemble
16  * @version $Revision: 1.8 $
17  * @todo Javadoc to complete
18  */
19 public class DefaultGraphRenderer extends AbstractGraphRenderer
20 {
21    /** Constructor for TrackRenderer. */
22    public DefaultGraphRenderer()
23    {
24       super();
25    }
26
27
28    /**
29     * @param graphics Description of the Parameter
30     */
31    protected void paintComponent(Graphics JavaDoc graphics)
32    {
33       double minX = element.getXRange().getMin();
34       double maxX = element.getXRange().getMax();
35       double minY = element.getYRange().getMin();
36       double maxY = element.getYRange().getMax();
37
38       Insets JavaDoc insets = this.getInsets();
39       int x = insets.left;
40       int y = insets.top;
41       double width = (double) this.getWidth() - 1 - insets.left - insets.right;
42       double height = (double) this.getHeight() - 1 - insets.top - insets.bottom;
43
44       double scaleX = width / (maxX - minX);
45       double scaleY = -height / (maxY - minY);
46       double offsetX = x - scaleX * minX;
47       double offsetY = y - scaleY * maxY;
48
49       if (this.horizontalScaling == GraphRenderer.ALIGN_LEFT)
50       {
51          scaleX = 1.0d;
52          offsetX = -minX;
53       }
54       if (this.horizontalScaling == GraphRenderer.ALIGN_RIGHT)
55       {
56          scaleX = 1.0d;
57          offsetX = width - maxX;
58       }
59
60       this.element.draw(graphics, scaleX, offsetX, scaleY, offsetY);
61    }
62 }
63
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