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Java > Open Source Codes > org > krysalis > jcharts > axisChart > customRenderers > axisValue > renderers > BackgroundRenderer


1 /***********************************************************************************************
2  * File Info: $Id: BackgroundRenderer.java,v 1.1 2003/05/17 16:56:18 nathaniel_auvil Exp $
3  * Copyright (C) 2002
4  * Author: Nathaniel G. Auvil
5  * Contributor(s):
6  *
7  * Copyright 2002 (C) Nathaniel G. Auvil. All Rights Reserved.
8  *
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10  * without modification, are permitted provided that the following conditions are met:
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12  * 1. Redistributions of source code must retain copyright statements and notices.
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15  * 2. Redistributions in binary form must reproduce the above copyright notice, this list of
16  * conditions and the following disclaimer in the documentation and/or other materials
17  * provided with the distribution.
18  *
19  * 3. The name "jCharts" or "Nathaniel G. Auvil" must not be used to endorse or promote
20  * products derived from this Software without prior written permission of Nathaniel G.
21  * Auvil. For written permission, please contact nathaniel_auvil@users.sourceforge.net
22  *
23  * 4. Products derived from this Software may not be called "jCharts" nor may "jCharts" appear
24  * in their names without prior written permission of Nathaniel G. Auvil. jCharts is a
25  * registered trademark of Nathaniel G. Auvil.
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39
40 package org.krysalis.jcharts.axisChart.customRenderers.axisValue.renderers;
41
42
43 import org.krysalis.jcharts.axisChart.customRenderers.axisValue.AxisValueRenderEvent;
44 import org.krysalis.jcharts.axisChart.customRenderers.axisValue.PreAxisValueRenderListener;
45
46 import java.awt.*;
47
48
49 public class BackgroundRenderer implements PreAxisValueRenderListener
50 {
51     private Paint paint;
52     private boolean draw= false;
53
54
55    /********************************************************************************
56      *
57      * @param paint the paint to do the background in. You might want to use an
58      * alpha less than 255 (as in 'new Color( 20, 20, 20, 50 )' ) as this gets
59      * plotted over top of the axis grid lines.
60      ********************************************************************************/

61     public BackgroundRenderer( Paint paint )
62     {
63         this.paint= paint;
64     }
65
66
67     /*********************************************************************************
68      *
69      * @param axisValueRenderEvent
70      *********************************************************************************/

71     public void preRender( AxisValueRenderEvent axisValueRenderEvent )
72     {
73         if( this.draw )
74         {
75             //---keep the current paint around
76
Paint currentPaint= axisValueRenderEvent.getGraphics2D().getPaint();
77
78             axisValueRenderEvent.getGraphics2D().setPaint( this.paint );
79             axisValueRenderEvent.getGraphics2D().fill( axisValueRenderEvent.getTotalItemAxisArea() );
80
81             //---reset the current Paint
82
axisValueRenderEvent.getGraphics2D().setPaint( currentPaint );
83         }
84 //todo this is not going to work for clustered bar, stacked bar, etc... as it is called each time
85
//---fill the background of every other item
86
this.draw= ! this.draw;
87     }
88
89 }
90
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