Package org.jCharts

Class Chart

java.lang.Object
org.jCharts.Chart
All Implemented Interfaces:
Serializable
Direct Known Subclasses:
AxisChart, PieChart2D
public abstract class Chart extends Object implements Serializable
Base class of all charts.
See Also:

  • Field Details

    • graphics2D

      private Graphics2D graphics2D

    • width

      private int width

    • height

      private int height

    • legend

      private Legend legend

    • chartProperties

      private ChartProperties chartProperties

    • generateImageMap

      private boolean generateImageMap

    • imageMap

      private ImageMap imageMap

    • bufferedImage

      private BufferedImage bufferedImage

  • Constructor Details

    • Chart

      public Chart(LegendProperties legendProperties, ChartProperties chartProperties, int pixelWidth, int pixelHeight)
      Constructor
      Parameters:
      legendProperties -
      chartProperties -
      pixelWidth -
      pixelHeight -

  • Method Details

    • getGenerateImageMapFlag

      public boolean getGenerateImageMapFlag()
      Returns flag indicating whether to generate an ImageMap
      Returns:
      boolean

    • getBufferedImage

      public BufferedImage getBufferedImage()
      Returns the BufferedImage used to generate the ImageMap. Only should be called on binary format images, such as PNG and JPG, as it will not work on SVG. This is a HACK and the design of jCharts should do better than this!!!!!!
      Returns:
      BufferedImage

    • renderWithImageMap

      public void renderWithImageMap() throws ChartDataException, PropertyException
      Renders the chart into a BufferedImage so that we can calculate all the Image Map coordinates.
      Throws:
      ChartDataException
      PropertyException

    • render

      public void render() throws ChartDataException, PropertyException
      Call this to kick off rendering of the chart
      Throws:
      ChartDataException
      PropertyException

    • renderChartTitle

      protected float renderChartTitle(String chartTitle, FontRenderContext fontRenderContext)
      Displays the chart title and returns the height of the title PLUS title padding.
      Parameters:
      chartTitle -
      fontRenderContext -
      Returns:
      float the height required by the title. If no title is displayed, zero is returned.

    • renderChart

      protected abstract void renderChart() throws ChartDataException, PropertyException
      Throws:
      ChartDataException
      PropertyException

    • getImageWidth

      public final int getImageWidth()
      Returns the BufferedImage width
      Returns:
      int

    • getImageHeight

      public final int getImageHeight()
      Returns the BufferedImage height
      Returns:
      int

    • getChartProperties

      public final ChartProperties getChartProperties()
      Returns the general properties Object.
      Returns:
      ChartProperties

    • getLegend

      protected final Legend getLegend()
      Returns the Legend. Will be NULL if no Legend is desired.
      Returns:
      Legend

    • hasLegend

      public final boolean hasLegend()
      Returns flag indicating if there is a Legend.
      Returns:
      boolean

    • setGraphics2D

      public final void setGraphics2D(Graphics2D graphics2D)
      Sets the graphics object to render the chart on by the encoder.
      Parameters:
      graphics2D -

    • getGraphics2D

      public final Graphics2D getGraphics2D()
      Shortcut method to get Graphics2D. Be aware that the call BufferedImage.getGraphics() and BufferedImage.createGraphics(), actually create a new Grpahics2D Object on each invocation. This returns the member reference so calls to this are not creating a new Object each time.
      Returns:
      Graphics2D

    • setImageMap

      public final void setImageMap(ImageMap imageMap)
      To optimze performance of the ImageMap Object, we create it once we know how many data elements are in the chart which is dependent on the AxisChart or PieChart2D
      Parameters:
      imageMap -

    • getImageMap

      public final ImageMap getImageMap()
      Returns:
      imageMap

    • toHTML

      public void toHTML(HTMLGenerator htmlGenerator, String imageFileName, ImageMap imageMap)
      Enables the testing routines to display the contents of this Object.
      Parameters:
      htmlGenerator -
      imageFileName -
      imageMap - if this is NULL we are not creating image map data in html