piechart2d.java

jCharts是一个100％基于Java的制图工具

			//---center the pie vertically
			this.pieY = halfImageHeight - halfDiameter;

			this.pieY += chartTitleHeight / 2;
		}


		//---IMAGE MAP setup
		//---if we are saving all the coordinates for an ImageMap, create the ImageMap Object as we
		//---	know how many area elements there are.
		if( super.getGenerateImageMapFlag() )
		{
			ImageMap imageMap = new ImageMap( iPieChartDataSet.getNumberOfDataItems() );
			super.setImageMap( imageMap );
		}


		PieChart2D.render( this );
	}


	/************************************************************************************************
	 * Implement the method to render the Chart.
	 *
	 * @param pieChart2D
	 ************************************************************************************************/
	static void render( PieChart2D pieChart2D )
	{
		Graphics2D g2d = pieChart2D.getGraphics2D();
		PieChart2DProperties properties = (PieChart2DProperties) pieChart2D.iPieChartDataSet.getChartTypeProperties();

		//---turn anti-aliasing on!
		g2d.setRenderingHint( RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON );

		//---set the border Stroke
		g2d.setStroke( properties.getBorderStroke() );


		//---the following only for Image Map-----------------------------
		//---IMAGE MAP
		//---number of subdivisions to break each slice into to 'fill' slice
		int subdivisions = 3;
		float halfDiameter = 0;
		float xPieMiddle = 0;
		float yPieMiddle = 0;
		float imageMapPoints[][] = null;
		if( pieChart2D.getImageMap() != null )
		{
			halfDiameter = (float) (pieChart2D.diameter / 2.0);
			xPieMiddle = halfDiameter + pieChart2D.pieX;
			yPieMiddle = halfDiameter + pieChart2D.pieY;
			imageMapPoints = new float[ pieChart2D.iPieChartDataSet.getNumberOfDataItems() * (subdivisions + 1) ][ 2 ];
		}


		//---get the starting degree
		float currentDegrees = properties.getZeroDegreeOffset();

		double percentageOfPie = 0;



		//---if only one item in chart, just draw border around outside.
		//---if do a draw of the arc, will get a line in the pie as arc has a start and end.
		if( pieChart2D.iPieChartDataSet.getNumberOfDataItems() == 1 )
		{
			Arc2D.Double arc = new Arc2D.Double( pieChart2D.pieX,
															 pieChart2D.pieY,
															 pieChart2D.diameter,
															 pieChart2D.diameter,
															 currentDegrees,
															 360,
															 Arc2D.OPEN );

			g2d.setPaint( pieChart2D.iPieChartDataSet.getPaint( 0 ) );
			g2d.fill( arc );

			g2d.setPaint( properties.getBorderPaint() );
			g2d.draw( arc );

			//---if only a single value use a circle map
			//---IMAGE MAP
			if( pieChart2D.getImageMap() != null )
			{
				CircleMapArea circleMapArea = new CircleMapArea( xPieMiddle, yPieMiddle, pieChart2D.iPieChartDataSet.getValue( 0 ), null, pieChart2D.iPieChartDataSet.getLegendLabel( 0 ) );
				circleMapArea.setRadius( (int) pieChart2D.diameter );
				pieChart2D.getImageMap().addImageMapArea( circleMapArea );
			}
		}
		else
		{
			Arc2D.Double arc = new Arc2D.Double( pieChart2D.pieX,
															 pieChart2D.pieY,
															 pieChart2D.diameter,
															 pieChart2D.diameter,
															 currentDegrees,
															 360,
															 Arc2D.PIE );
			//---IMAGE MAP
			int mapCounter = 0;

			for( int i = 0; i < pieChart2D.iPieChartDataSet.getNumberOfDataItems(); i++ )
			{
				percentageOfPie = pieChart2D.pieChartDataProcessor.getPercentageOfPie( i );

				arc.setAngleStart( currentDegrees );
				arc.setAngleExtent( percentageOfPie );

				//---set the color, and fill the pie piece.
				g2d.setPaint( pieChart2D.iPieChartDataSet.getPaint( i ) );
				g2d.fill( arc );

				g2d.setPaint( properties.getBorderPaint() );
				g2d.draw( arc );


				//---if we are going to display labels
				if( pieChart2D.textTagGroup != null )
				{
					//---get the angle the center of slice
					double sliceCenterDegrees = (currentDegrees) + percentageOfPie / 2;

					if( sliceCenterDegrees > 360 )
					{
						sliceCenterDegrees -= 360;
					}


					double sliceCenterRadians = Math.toRadians( sliceCenterDegrees );

					//---compute the cos and sin of the label angle.
					double cosOfLabel = Math.cos( sliceCenterRadians );
					double sinOfLabel = Math.sin( sliceCenterRadians );

					halfDiameter = (float) (pieChart2D.diameter / 2.0);


					//---end point of the label border line.
					float borderXstart = (float) (cosOfLabel * halfDiameter);
					float borderYstart = (float) -(sinOfLabel * halfDiameter);

					//---end point of the label border line.
					float borderXend = (float) (cosOfLabel * (halfDiameter + properties.getTickLength()));
					float borderYend = (float) -(sinOfLabel * (halfDiameter + properties.getTickLength()));


					xPieMiddle = halfDiameter + pieChart2D.pieX;
					yPieMiddle = halfDiameter + pieChart2D.pieY;

					properties.getValueLabelFont().setupGraphics2D( g2d );

					g2d.draw( new Line2D.Double( xPieMiddle + borderXstart,
														  yPieMiddle + borderYstart,
														  xPieMiddle + borderXend,
														  yPieMiddle + borderYend ) );

//System.out.println( pieChart2D.textTagGroup.getTextTag( i ).getText() + "  sliceCenterDegrees= " + sliceCenterDegrees );

					float labelY = yPieMiddle + borderYend;
					if( sliceCenterDegrees > 60 && sliceCenterDegrees < 120 )
					{
						labelY -= pieChart2D.textTagGroup.getTextTag( i ).getFontDescent();
					}
					else if( sliceCenterDegrees > 240 && sliceCenterDegrees < 300 )
					{
						labelY += pieChart2D.textTagGroup.getTextTag( i ).getFontAscent();
					}


					if( sliceCenterDegrees > 90 && sliceCenterDegrees < 270 )
					{
						g2d.drawString( pieChart2D.textTagGroup.getTextTag( i ).getText(),
											 xPieMiddle + borderXend - pieChart2D.textTagGroup.getTextTag( i ).getWidth() - properties.getTickLength(),
											 labelY );
					}
					else
					{
						g2d.drawString( pieChart2D.textTagGroup.getTextTag( i ).getText(),
											 xPieMiddle + borderXend + properties.getTickLength(),
											 labelY );
					}
				}





				//---if we are generating an image map...
				//---IMAGE MAP
				if( pieChart2D.getImageMap() != null )
				{
					//---increment a separate amount to minimize rounding errors.
					double workDegrees = currentDegrees;

					//---get the angle the bodrder of slice.
					//double sliceBorderDegree = currentDegrees;


					//---compute the cos and sin of the bodrder angle.
					double cosOfBorder;
					double sinOfBorder;

					/*
					//---compute the cos and sin of the bodrder angle.
					double cosOfBorder= Math.cos( Math.toRadians( sliceBorderDegree ) );
					double sinOfBorder= Math.sin( Math.toRadians( sliceBorderDegree ) );

					//---end point of the slice border line.
					imageMapPoints[ i ][ 0 ]= xPieMiddle + (float) ( cosOfBorder * halfDiameter ) ;
					imageMapPoints[ i ][ 1 ]= yPieMiddle + (float) -( sinOfBorder * halfDiameter );
					*/


					double splitDegree = percentageOfPie / subdivisions;
					for( int j = 0; j <= subdivisions; j++ )
					{
						cosOfBorder = Math.cos( Math.toRadians( workDegrees ) );
						sinOfBorder = Math.sin( Math.toRadians( workDegrees ) );

						//---end point of the slice border line.
						imageMapPoints[ mapCounter ][ 0 ] = xPieMiddle + (float) (cosOfBorder * halfDiameter);
						imageMapPoints[ mapCounter ][ 1 ] = yPieMiddle + (float) -(sinOfBorder * halfDiameter);

						//DEBUG to make sure calculating points correctly
						//g2d.setPaint( Color.red );
						//g2d.fillRect( (int) imageMapPoints[ mapCounter ][ 0 ], (int) imageMapPoints[ mapCounter ][ 1 ], 6, 6 );

						mapCounter++;
						workDegrees += splitDegree;
					}
				}

				currentDegrees += percentageOfPie;
			}


			//---if we are generating an image map...
			//---IMAGE MAP
			if( pieChart2D.getImageMap() != null )
			{
				//---each slice has 3 + subdivision slices...
				//int counter= pieChart2D.iPieChartDataSet.getNumberOfDataItems() * ( 3 + subdivisions );
				int counter = 0;

				//---for each data item
				for( int i = 0; i < pieChart2D.iPieChartDataSet.getNumberOfDataItems(); i++ )
				{
					int coordinateCounter = 0;

					//---there are three points plus some number of subdivisions...
					PolyMapArea polyMapArea = new PolyMapArea( 3 + subdivisions, pieChart2D.iPieChartDataSet.getValue( i ), null, pieChart2D.iPieChartDataSet.getLegendLabel( i ) );
					polyMapArea.addCoordinate( coordinateCounter++, xPieMiddle, yPieMiddle );

					//polyMapArea.addCoordinate( 1, imageMapPoints[ i ][ 0 ], imageMapPoints[ i ][ 1 ] );

					//---include the first border point, plus the subdivisions
					for( int h = 0; h <= subdivisions; h++ )
					{
						polyMapArea.addCoordinate( coordinateCounter++, imageMapPoints[ counter ][ 0 ], imageMapPoints[ counter ][ 1 ] );
						counter++;
					}

					//---if this is the last slice, add the first calculated map point
					if( (i + 1) == pieChart2D.iPieChartDataSet.getNumberOfDataItems() )
					{
						polyMapArea.addCoordinate( coordinateCounter, imageMapPoints[ 0 ][ 0 ], imageMapPoints[ 0 ][ 1 ] );
					}
					//---else add the next calculated point
					else
					{
						//---increment counter which takes us to the first calculated point on the next slice
						//counter++;
						polyMapArea.addCoordinate( coordinateCounter, imageMapPoints[ counter ][ 0 ], imageMapPoints[ counter ][ 1 ] );
					}

					pieChart2D.getImageMap().addImageMapArea( polyMapArea );
				}
			}

		}
	}


	/**********************************************************************************************
	 * Enables the testing routines to display the contents of this Object. Override Chart
	 *  implementation as PieCharts use AreaProperties directly rather than a child.
	 *
	 * @param htmlGenerator
	 * @param imageFileName
	 **********************************************************************************************/
	public void toHTML( HTMLGenerator htmlGenerator, String imageFileName )
	{
		if( this.getLegend() != null )
		{
			htmlGenerator.chartTableRowStart();
			this.getLegend().toHTML( htmlGenerator );
			htmlGenerator.chartTableRowEnd();
		}

		htmlGenerator.chartTableEnd();
	}

}