axischart.java

jCharts是一个100％基于Java的制图工具

			//---Determine how many labels will fit on the x-axis

			this.xAxis.computeScalePixelWidthDataAxis();

			this.yAxis.computeScalePixelWidth();
			this.xAxis.computeOneUnitPixelSize( this.xAxis.getScalePixelWidth(), this.xAxis.getScaleCalculator().getIncrement() );


			//---we ADD to the origin position when doing x-axis
			float zeroLineCoordinate = ( float ) ( this.xAxis.getOrigin() + ( this.xAxis.getScalePixelWidth() * ( -this.xAxis.getScaleCalculator().getMinValue() ) ) / this.xAxis.getScaleCalculator().getIncrement() );
			this.xAxis.setZeroLineCoordinate( zeroLineCoordinate );
		}
		else
		{
			//DataAxisProperties dataAxisProperties = ( DataAxisProperties ) this.axisProperties.getYAxisProperties();

			this.xAxis.computeScalePixelWidth();
			this.yAxis.computeScalePixelWidthDataAxis();
         this.yAxis.computeOneUnitPixelSize( this.yAxis.getScalePixelWidth(), this.yAxis.getScaleCalculator().getIncrement() );

			//---we SUBTRACT to the origin position when doing y-axis
			float zeroLineCoordinate = ( float ) ( this.yAxis.getOrigin() - ( this.yAxis.getScalePixelWidth() * ( -this.yAxis.getScaleCalculator().getMinValue() ) ) / this.yAxis.getScaleCalculator().getIncrement() );
			this.yAxis.setZeroLineCoordinate( zeroLineCoordinate );
		}

		this.xAxis.computeTickStart();
	}


	/********************************************************************************************
	 * Implement the method to render the Axis based chart
	 *
	 * @throws ChartDataException
	 * @throws PropertyException there are several validations done to aid in development of the
	 * 	charts.
	 ********************************************************************************************/
	protected void renderChart() throws ChartDataException, PropertyException
	{
		if( super.getChartProperties().validate() )
		{
			this.iAxisDataSeries.validate();
		}

		//---this is not an optional validation
		this.validateHorizontalPlot();


		Graphics2D g2d = super.getGraphics2D();
		g2d.setRenderingHint( RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON );

		FontRenderContext fontRenderContext = g2d.getFontRenderContext();


		//---cache calcs used more than once
		float edgePaddingTimesTwo = super.getChartProperties().getEdgePadding() * 2;


		//---start off with total image width and we will subtract components from that.
		float xAxisWidth = super.getImageWidth() - edgePaddingTimesTwo;
		float yAxisHeight = super.getImageHeight() - edgePaddingTimesTwo;


		//---render the TITLE. If no title, this will return zero.
		float chartTitleHeight = super.renderChartTitle( this.getIAxisDataSeries().getChartTitle(), fontRenderContext );
		yAxisHeight -= chartTitleHeight;


		//---if there is a legend...
		if( super.getLegend() != null )
		{
			//---PROCESS the size needed for drawing the legend.
			super.getLegend().computeLegendXY( this.iAxisDataSeries, chartTitleHeight );

			if( ( super.getLegend().getLegendProperties().getPlacement() == LegendAreaProperties.RIGHT )
				|| ( super.getLegend().getLegendProperties().getPlacement() == LegendAreaProperties.LEFT ) )
			{
				xAxisWidth -= super.getLegend().getLegendProperties().getChartPadding();
				xAxisWidth -= super.getLegend().getWidth();
			}
			else //LegendAreaProperties.BOTTOM, OR LegendAreaProperties.TOP
			{
				yAxisHeight -= this.getLegend().getLegendProperties().getChartPadding();
				yAxisHeight -= this.getLegend().getHeight();
			}

			super.getLegend().render();
		}


		AxisChartDataProcessor axisChartDataProcessor = this.createAxisChartDataProcessor();
		axisChartDataProcessor.processData( this, fontRenderContext );


		this.setupAxis( axisChartDataProcessor, fontRenderContext );
		this.sizeAndPositionAxis( xAxisWidth, yAxisHeight, chartTitleHeight );
		this.deriveAxisValues();



		//---PAINT THE BACKGROUND OF AXIS
		if( this.getAxisProperties().getBackgroundPaint() != null )
		{
			Rectangle2D.Float rectangle = new Rectangle2D.Float( this.xAxis.getOrigin() + 1,
																				  this.yAxis.getOrigin() - this.yAxis.getPixelLength(),
																				  this.xAxis.getPixelLength(),
																				  this.yAxis.getPixelLength() );
			g2d.setPaint( this.axisProperties.getBackgroundPaint() );
			g2d.fill( rectangle );
		}


		this.yAxis.render( g2d, this.getAxisProperties(), iAxisDataSeries.getYAxisTitle() );
		this.xAxis.render( g2d, this.getAxisProperties(), iAxisDataSeries.getXAxisTitle() );


		//---SCALE CLIPPING REGION
		//---if the user defined the scale, chart may be off the 'screen' so set a clipping region so only draw in the chart.
		Rectangle2D.Float rectangle = new Rectangle2D.Float( this.getXAxis().getOrigin(),
																				  this.getYAxis().getOrigin() - this.getYAxis().getPixelLength() + 1,
																				  this.xAxis.getPixelLength() + 1,
																				  this.yAxis.getPixelLength() - 2 );
		g2d.setClip( rectangle );


		//---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() )
		{
			//---pass the size to try and avoid having the expense of resizing the ArrayList
			ImageMap imageMap = new ImageMap( iAxisDataSeries.size() * iAxisDataSeries.getTotalNumberOfDataSets() );
			super.setImageMap( imageMap );
		}


		//---draw the charts over the axis...
		overlayCharts();
	}


	/********************************************************************************************
	 * Draws the charts over the axis.  We have to render in a specific order so combo charts
	 * 	get drawn correctly
	 *
	 * @throws PropertyException
	 ******************************************************************************************/
	protected void overlayCharts() throws PropertyException, ChartDataException
	{
		IAxisPlotDataSet iAxisPlotDataSet;

		iAxisPlotDataSet = this.iAxisDataSeries.getIAxisPlotDataSet( ChartType.AREA_STACKED );
		if( iAxisPlotDataSet != null )
		{
			StackedAreaChart.render( this, ( IAxisChartDataSet ) iAxisPlotDataSet );
		}
		iAxisPlotDataSet = this.iAxisDataSeries.getIAxisPlotDataSet( ChartType.AREA );
		if( iAxisPlotDataSet != null )
		{
			AreaChart.render( this, ( IAxisChartDataSet ) iAxisPlotDataSet );
		}


		iAxisPlotDataSet = this.iAxisDataSeries.getIAxisPlotDataSet( ChartType.BAR );
		if( iAxisPlotDataSet != null )
		{
			BarChart.render( this, ( IAxisChartDataSet ) iAxisPlotDataSet );
		}
		iAxisPlotDataSet = this.iAxisDataSeries.getIAxisPlotDataSet( ChartType.BAR_STACKED );
		if( iAxisPlotDataSet != null )
		{
			StackedBarChart.render( this, ( IAxisChartDataSet ) iAxisPlotDataSet );
		}
		iAxisPlotDataSet = this.iAxisDataSeries.getIAxisPlotDataSet( ChartType.BAR_CLUSTERED );
		if( iAxisPlotDataSet != null )
		{
			ClusteredBarChart.render( this, ( IAxisChartDataSet ) iAxisPlotDataSet );
		}


		iAxisPlotDataSet = this.iAxisDataSeries.getIAxisPlotDataSet( ChartType.STOCK );
		if( iAxisPlotDataSet != null )
		{
			StockChart.render( this, ( IStockChartDataSet ) iAxisPlotDataSet );
		}


		iAxisPlotDataSet = this.iAxisDataSeries.getIAxisPlotDataSet( ChartType.LINE );
		if( iAxisPlotDataSet != null )
		{
			LineChart.render( this, ( IAxisChartDataSet ) iAxisPlotDataSet );
		}

		iAxisPlotDataSet = this.iAxisDataSeries.getIAxisPlotDataSet( ChartType.POINT );
		if( iAxisPlotDataSet != null )
		{
			PointChart.render( this, ( IAxisChartDataSet ) iAxisPlotDataSet );
		}
	}


	/**********************************************************************************************
	 * Currently, we only support the bar chart types being horizontal, and you can not have a
	 * 	horizontally plotted bar chart in a combo chart.
	 *
	 * @throws PropertyException
	 **********************************************************************************************/
	private void validateHorizontalPlot() throws PropertyException
	{
		if( axisProperties.isPlotHorizontal() )
		{
			//---if there is only one data set, there is no need to do any validations.
			if( this.iAxisDataSeries.size() > 1 )
			{
				throw new PropertyException( "You can not have a combo chart on a horizontal plot." );
			}

			if( !this.allowHorizontalPlot() )
			{
				throw new PropertyException( "Horizontal plots are only supported in the Bar, Stacked Bar, and Clustered Bar Chart Types." );
			}
		}
	}


	/******************************************************************************************
	 * We only allow horizontal plots for the Bar Chart types in this release.
	 *
	 * @return boolean
	 ******************************************************************************************/
	private boolean allowHorizontalPlot()
	{
		if( this.iAxisDataSeries.getIAxisPlotDataSet( ChartType.BAR ) != null )
		{
			return true;
		}

		if( this.iAxisDataSeries.getIAxisPlotDataSet( ChartType.BAR_STACKED ) != null )
		{
			return true;
		}

		if( this.iAxisDataSeries.getIAxisPlotDataSet( ChartType.BAR_CLUSTERED ) != null )
		{
			return true;
		}

		return false;
	}


	/**************************************************************************************************
	 *
	 ***************************************************************************************************/
	public AxisProperties getAxisProperties()
	{
		return this.axisProperties;
	}


	/**************************************************************************************************
	 *
	 ***************************************************************************************************/
	public XAxis getXAxis()
	{
		return this.xAxis;
	}


	/**************************************************************************************************
	 *
	 ***************************************************************************************************/
	public YAxis getYAxis()
	{
		return this.yAxis;
	}


	/**********************************************************************************************
	 * 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
	 * @param imageMap if this is NULL we are not creating image map data in html
	 **********************************************************************************************/
	public void toHTML( HTMLGenerator htmlGenerator, String imageFileName, ImageMap imageMap )
	{
		htmlGenerator.chartTableStart( this.getClass().getName(), imageFileName, imageMap );

		if( this.iAxisDataSeries instanceof HTMLTestable )
		{
			( ( HTMLTestable ) this.iAxisDataSeries ).toHTML( htmlGenerator );
		}

		//---AxisProperties
		htmlGenerator.chartTableRowStart();
		this.axisProperties.toHTML( htmlGenerator );
		htmlGenerator.chartTableRowEnd();


		//---XAxis
		htmlGenerator.chartTableRowStart();
		this.xAxis.toHTML( htmlGenerator );
		htmlGenerator.chartTableRowEnd();

		//---YAxis
		htmlGenerator.chartTableRowStart();
		this.yAxis.toHTML( htmlGenerator );
		htmlGenerator.chartTableRowEnd();


		//---ChartProperties
		htmlGenerator.chartTableRowStart();
		super.getChartProperties().toHTML( htmlGenerator );
		htmlGenerator.chartTableRowEnd();


		if( super.getLegend() != null )
		{
			htmlGenerator.chartTableRowStart();
			this.getLegend().toHTML( htmlGenerator );
			htmlGenerator.chartTableRowEnd();
		}

		htmlGenerator.chartTableEnd();
	}

}