Example usage for org.jfree.chart.renderer.xy XYItemRendererState XYItemRendererState

Introduction

In this page you can find the example usage for org.jfree.chart.renderer.xy XYItemRendererState XYItemRendererState.

Prototype

public XYItemRendererState(PlotRenderingInfo info) 

Source Link

Document

Creates a new state.

Usage

From source file:org.trade.ui.chart.renderer.HeikinAshiRenderer.java

/**
 * Method initialise.//from   w w  w. j  a v a 2  s  .c  o m
 * 
 * @param g2
 *            Graphics2D
 * @param dataArea
 *            Rectangle2D
 * @param plot
 *            XYPlot
 * @param dataset
 *            XYDataset
 * @param info
 *            PlotRenderingInfo
 * @return XYItemRendererState
 * @see org.jfree.chart.renderer.xy.XYItemRenderer#initialise(Graphics2D,
 *      Rectangle2D, XYPlot, XYDataset, PlotRenderingInfo)
 */
public XYItemRendererState initialise(Graphics2D g2, Rectangle2D dataArea, XYPlot plot, XYDataset dataset,
        PlotRenderingInfo info) {

    ValueAxis axis = plot.getDomainAxis();
    double x1 = axis.getLowerBound();
    double x2 = x1 + getMaxCandleWidthInMilliseconds();
    RectangleEdge edge = plot.getDomainAxisEdge();
    double xx1 = axis.valueToJava2D(x1, dataArea, edge);
    double xx2 = axis.valueToJava2D(x2, dataArea, edge);
    maxCandleWidth = Math.abs(xx2 - xx1);
    return new XYItemRendererState(info);
}

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From source file:edu.dlnu.liuwenpeng.render.CandlestickRenderer.java

/**    
* Initialises the renderer then returns the number of 'passes' through the    
* data that the renderer will require (usually just one).  This method    
* will be called before the first item is rendered, giving the renderer    
* an opportunity to initialise any state information it wants to maintain.    
* The renderer can do nothing if it chooses.    
*    //from   w  w w .ja  v a  2  s  .c  o  m
* @param g2  the graphics device.    
* @param dataArea  the area inside the axes.    
* @param plot  the plot.    
* @param dataset  the data.    
* @param info  an optional info collection object to return data back to    
*              the caller.    
*    
* @return The number of passes the renderer requires.    
*/
public XYItemRendererState initialise(Graphics2D g2, Rectangle2D dataArea, XYPlot plot, XYDataset dataset,
        PlotRenderingInfo info) {

    // calculate the maximum allowed candle width from the axis...    
    ValueAxis axis = plot.getDomainAxis();
    double x1 = axis.getLowerBound();
    double x2 = x1 + this.maxCandleWidthInMilliseconds;
    RectangleEdge edge = plot.getDomainAxisEdge();
    double xx1 = axis.valueToJava2D(x1, dataArea, edge);
    double xx2 = axis.valueToJava2D(x2, dataArea, edge);
    this.maxCandleWidth = Math.abs(xx2 - xx1);
    // Absolute value, since the relative x    
    // positions are reversed for horizontal orientation    

    // calculate the highest volume in the dataset...    
    if (this.drawVolume) {
        OHLCDataset highLowDataset = (OHLCDataset) dataset;
        this.maxVolume = 0.0;
        for (int series = 0; series < highLowDataset.getSeriesCount(); series++) {
            for (int item = 0; item < highLowDataset.getItemCount(series); item++) {
                double volume = highLowDataset.getVolumeValue(series, item);
                if (volume > this.maxVolume) {
                    this.maxVolume = volume;
                }

            }
        }
    }

    return new XYItemRendererState(info);
}

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