Java XYDataset.getY方法代码示例

import org.jfree.data.xy.XYDataset; //导入方法依赖的package包/类
/**
 * Calculates the stacked value of the all series up to, but not including <code>series</code>
 * for the specified category, <code>category</code>.  It returns 0.0 if <code>series</code>
 * is the first series, i.e. 0.
 *
 * @param data  the data.
 * @param series  the series.
 * @param index  the index.
 *
 * @return double returns a cumulative value for all series' values up to
 * but excluding <code>series</code> for <code>index</code>.
 */
protected double getPreviousHeight(XYDataset data, int series, int index) {

    double result = 0.0;

    Number tmp;
    for (int i = 0; i < series; i++) {
        tmp = data.getY(i, index);
        if (tmp != null) {
            result += tmp.doubleValue();
        }
    }

    return result;

}
 

import org.jfree.data.xy.XYDataset; //导入方法依赖的package包/类
/**
 * Calculates the stacked value of the all series up to, but not including <code>series</code>
 * for the specified category, <code>category</code>.  It returns 0.0 if <code>series</code>
 * is the first series, i.e. 0.
 *
 * @param dataset  the data.
 * @param series  the series.
 * @param index  the index.
 *
 * @return double returns a cumulative value for all series' values up to
 * but excluding <code>series</code> for <code>index</code>.
 */
private double[] getStackValues(XYDataset dataset, int series, int index) {
    double[] result = new double[2];
    for (int i = 0; i < series; i++) {
        Number n = dataset.getY(i, index);
        if (n != null) {
            double v = n.doubleValue();
            if (v >= 0.0) {
                result[1] += v;   
            }
            else {
                result[0] += v;   
            }
        }
    }
    return result;
}
 

import org.jfree.data.xy.XYDataset; //导入方法依赖的package包/类
/**
 * Creates the array of items that can be passed to the {@link MessageFormat} class
 * for creating labels.
 *
 * @param dataset  the dataset (<code>null</code> not permitted).
 * @param series  the series (zero-based index).
 * @param item  the item (zero-based index).
 *
 * @return The items (never <code>null</code>).
 */
protected Object[] createItemArray(XYDataset dataset, int series, int item) {
    Object[] result = new Object[3];
    result[0] = dataset.getSeriesName(series);
    Number x = dataset.getX(series, item);
    if (this.xDateFormat != null) {
        result[1] = this.xDateFormat.format(x);   
    }
    else {
        result[1] = this.xFormat.format(x);
    }
    Number y = dataset.getY(series, item);
    if (this.yDateFormat != null) {
        result[2] = this.yDateFormat.format(y);   
    }
    else {
        result[2] = this.yFormat.format(y);
    }
    return result;
}
 

import org.jfree.data.xy.XYDataset; //导入方法依赖的package包/类
/**
 * Draws the visual representation of a single data item.
 *
 * @param g2  the graphics device.
 * @param state  the renderer state.
 * @param dataArea  the area within which the data is being drawn.
 * @param info  collects information about the drawing.
 * @param plot  the plot (can be used to obtain standard color information etc).
 * @param domainAxis  the domain (horizontal) axis.
 * @param rangeAxis  the range (vertical) axis.
 * @param dataset  the dataset.
 * @param series  the series index (zero-based).
 * @param item  the item index (zero-based).
 * @param crosshairState  crosshair information for the plot (<code>null</code> permitted).
 * @param pass  the pass index.
 */
public void drawItem(Graphics2D g2,
                     XYItemRendererState state,
                     Rectangle2D dataArea,
                     PlotRenderingInfo info,
                     XYPlot plot,
                     ValueAxis domainAxis,
                     ValueAxis rangeAxis,
                     XYDataset dataset,
                     int series,
                     int item,
                     CrosshairState crosshairState,
                     int pass) {

    // get the data point...
    Number xn = dataset.getX(series, item);
    Number yn = dataset.getY(series, item);
    if (yn != null) {
        double x = xn.doubleValue();
        double y = yn.doubleValue();
        RectangleEdge xAxisLocation = plot.getDomainAxisEdge();
        RectangleEdge yAxisLocation = plot.getRangeAxisEdge();
        double transX = domainAxis.valueToJava2D(x, dataArea, xAxisLocation);
        double transY = rangeAxis.valueToJava2D(y, dataArea, yAxisLocation);

        g2.setPaint(this.getItemPaint(series, item));
        PlotOrientation orientation = plot.getOrientation();
        if (orientation == PlotOrientation.HORIZONTAL) {
            g2.drawRect((int) transY, (int) transX, 1, 1);
        }
        else if (orientation == PlotOrientation.VERTICAL) {
            g2.drawRect((int) transX, (int) transY, 1, 1);
        }

        updateCrosshairValues(crosshairState, x, y, transX, transY, orientation);
    }

}
 

import org.jfree.data.xy.XYDataset; //导入方法依赖的package包/类
/**
 * Creates the array of items that can be passed to the 
 * {@link MessageFormat} class for creating labels.
 *
 * @param dataset  the dataset (<code>null</code> not permitted).
 * @param series  the series (zero-based index).
 * @param item  the item (zero-based index).
 *
 * @return An array of three items from the dataset formatted as
 *         <code>String</code> objects (never <code>null</code>).
 */
protected Object[] createItemArray(XYDataset dataset, int series, 
                                   int item) {
    Object[] result = new Object[3];
    result[0] = dataset.getSeriesKey(series).toString();
    
    double x = dataset.getXValue(series, item);
    if (Double.isNaN(x) && dataset.getX(series, item) == null) {
        result[1] = this.nullXString;
    }
    else {
        if (this.xDateFormat != null) {
            result[1] = this.xDateFormat.format(new Date((long) x));   
        }
        else {
            result[1] = this.xFormat.format(x);
        }
    }
    
    double y = dataset.getYValue(series, item);
    if (Double.isNaN(y) && dataset.getY(series, item) == null) {
        result[2] = this.nullYString;
    }
    else {
        if (this.yDateFormat != null) {
            result[2] = this.yDateFormat.format(new Date((long) y));   
        }
        else {
            result[2] = this.yFormat.format(y);
        }
    }
    return result;
}