areachart.java

jCharts是一个100％基于Java的制图工具

/***********************************************************************************************
 * File Info: $Id: AreaChart.java,v 1.7 2003/02/11 03:17:23 nathaniel_auvil Exp $
 * Copyright (C) 2000
 * Author: Nathaniel G. Auvil
 * Contributor(s):
 *
 * Copyright 2002 (C) Nathaniel G. Auvil. All Rights Reserved.
 *
 * Redistribution and use of this software and associated documentation ("Software"), with or
 * without modification, are permitted provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain copyright statements and notices.
 * 	Redistributions must also contain a copy of this document.
 *
 * 2. Redistributions in binary form must reproduce the above copyright notice, this list of
 * 	conditions and the following disclaimer in the documentation and/or other materials
 * 	provided with the distribution.
 *
 * 3. The name "jCharts" or "Nathaniel G. Auvil" must not be used to endorse or promote
 * 	products derived from this Software without prior written permission of Nathaniel G.
 * 	Auvil.  For written permission, please contact [e-mail]
 *
 * 4. Products derived from this Software may not be called "jCharts" nor may "jCharts" appear
 * 	in their names without prior written permission of Nathaniel G. Auvil. jCharts is a
 * 	registered trademark of Nathaniel G. Auvil.
 *
 * 5. Due credit should be given to the jCharts Project (http://jcharts.sourceforge.net/).
 *
 * THIS SOFTWARE IS PROVIDED BY Nathaniel G. Auvil AND CONTRIBUTORS ``AS IS'' AND ANY
 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL
 * jCharts OR ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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 * IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE
 ************************************************************************************************/

package org.jCharts.axisChart;


import org.jCharts.chartData.interfaces.IAxisChartDataSet;
import org.jCharts.imageMap.ImageMapNotSupportedException;
import org.jCharts.properties.DataAxisProperties;

import java.awt.*;
import java.awt.geom.Area;
import java.awt.geom.GeneralPath;


abstract class AreaChart
{

	/********************************************************************************************
	 * Draws the chart
	 *
	 * @param axisChart
	 * @param iAxisChartDataSet
	 *********************************************************************************************/
	static void render( AxisChart axisChart, IAxisChartDataSet iAxisChartDataSet )
	{
		//---hopefully eliminate support requests asking about this...
		if( axisChart.getImageMap() != null )
		{
//todo should we do a point image map?
			throw new ImageMapNotSupportedException( "HTML client-side image maps are not supported on Area Charts." );
		}


		//AreaChartProperties areaChartProperties=(AreaChartProperties) iAxisChartDataSet.getChartTypeProperties();
		float xPosition=axisChart.getXAxis().getTickStart();

		GeneralPath generalPaths[]=new GeneralPath[ iAxisChartDataSet.getNumberOfDataSets() ];


		//---AreaCharts can not be drawn on a horizontal axis so y-axis will always be the data axis
		DataAxisProperties dataAxisProperties= (DataAxisProperties) axisChart.getAxisProperties().getYAxisProperties();


		//LOOP
		//---initial postion of each line must be set with call to moveTo()
		//---Do this here so every point does not have to check....if( i == 0 )... in loop
		for( int i=0; i < generalPaths.length; i++ )
		{
			generalPaths[ i ]=new GeneralPath();
			generalPaths[ i ].moveTo( xPosition, axisChart.getYAxis().getZeroLineCoordinate() );
			generalPaths[ i ].lineTo( xPosition, axisChart.getYAxis().computeAxisCoordinate( axisChart.getYAxis().getOrigin(),
																														iAxisChartDataSet.getValue( i, 0 ),
																														axisChart.getYAxis().getScaleCalculator().getMinValue() ) );
		}

		//LOOP
		for( int j=1; j < iAxisChartDataSet.getNumberOfDataItems(); j++ )
		{
			xPosition+=axisChart.getXAxis().getScalePixelWidth();

			//LOOP
			for( int i=0; i < generalPaths.length; i++ )
			{
				generalPaths[ i ].lineTo( xPosition, axisChart.getYAxis().computeAxisCoordinate( axisChart.getYAxis().getOrigin(),
																															iAxisChartDataSet.getValue( i, j ),
																															axisChart.getYAxis().getScaleCalculator().getMinValue() ) );
			}
		}


		Area[] areas=new Area[ generalPaths.length ];


		//LOOP
		//---close the path. Do this here so do not have to check if last every pass through above loop.
		for( int i=0; i < generalPaths.length; i++ )
		{
			generalPaths[ i ].lineTo( xPosition, axisChart.getYAxis().getZeroLineCoordinate() );
			generalPaths[ i ].closePath();

			areas[ i ]=new Area( generalPaths[ i ] );
		}

		Graphics2D g2d=axisChart.getGraphics2D();

		//LOOP
		//---draw each path to the image
		for( int i=0; i < areas.length; i++ )
		{
			g2d.setPaint( iAxisChartDataSet.getPaint( i ) );
			g2d.fill( areas[ i ] );
		}
	}

}