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| public class MyItemRenderer extends StandardXYItemRenderer{
private Rectangle2D dataArea;
/**
* 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 axis.
* @param rangeAxis the range 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) {
this.dataArea = dataArea;
boolean itemVisible = getItemVisible(series, item);
// setup for collecting optional entity info...
Shape entityArea = null;
EntityCollection entities = null;
if (info != null) {
entities = info.getOwner().getEntityCollection();
}
PlotOrientation orientation = plot.getOrientation();
Paint paint = getItemPaint(series, item);
Stroke seriesStroke = getItemStroke(series, item);
g2.setPaint(paint);
g2.setStroke(seriesStroke);
// get the data point...
double x1 = dataset.getXValue(series, item);
double y1 = dataset.getYValue(series, item);
if (Double.isNaN(x1) || Double.isNaN(y1)) {
itemVisible = false;
}
RectangleEdge xAxisLocation = plot.getDomainAxisEdge();
RectangleEdge yAxisLocation = plot.getRangeAxisEdge();
double transX1 = domainAxis.valueToJava2D(x1, dataArea, xAxisLocation);
double transY1 = rangeAxis.valueToJava2D(y1, dataArea, yAxisLocation);
// chart.setDataArea(dataArea);
if (false){
System.out.println("X : " + x1 + " > " + transX1 + " Y : " + y1 + " > " + transY1);
}
if (getPlotLines()) {
if (this.getDrawSeriesLineAsPath()) {
State s = (State) state;
if (s.getSeriesIndex() != series) {
// we are starting a new series path
s.seriesPath.reset();
s.setLastPointGood(false);
s.setSeriesIndex(series);
}
// update path to reflect latest point
if (itemVisible && !Double.isNaN(transX1)
&& !Double.isNaN(transY1)) {
float x = (float) transX1;
float y = (float) transY1;
if (orientation == PlotOrientation.HORIZONTAL) {
x = (float) transY1;
y = (float) transX1;
}
if (s.isLastPointGood()) {
// TODO: check threshold
s.seriesPath.lineTo(x, y);
}
else {
s.seriesPath.moveTo(x, y);
}
s.setLastPointGood(true);
}
else {
s.setLastPointGood(false);
}
if (item == dataset.getItemCount(series) - 1) {
if (s.getSeriesIndex() == series) {
// draw path
g2.setStroke(getSeriesStroke(series));
g2.setPaint(getSeriesPaint(series));
g2.draw(s.seriesPath);
}
}
}
else if (item != 0 && itemVisible) {
// get the previous data point...
double x0 = dataset.getXValue(series, item - 1);
double y0 = dataset.getYValue(series, item - 1);
if (!Double.isNaN(x0) && !Double.isNaN(y0)) {
boolean drawLine = true;
if (getPlotDiscontinuous()) {
// only draw a line if the gap between the current and
// previous data point is within the threshold
int numX = dataset.getItemCount(series);
double minX = dataset.getXValue(series, 0);
double maxX = dataset.getXValue(series, numX - 1);
if (this.getGapThresholdType() == UnitType.ABSOLUTE) {
drawLine = Math.abs(x1 - x0) <= this.getGapThreshold();
}
else {
drawLine = Math.abs(x1 - x0) <= ((maxX - minX)
/ numX * getGapThreshold());
}
}
if (drawLine) {
double transX0 = domainAxis.valueToJava2D(x0, dataArea,
xAxisLocation);
double transY0 = rangeAxis.valueToJava2D(y0, dataArea,
yAxisLocation);
// only draw if we have good values
if (Double.isNaN(transX0) || Double.isNaN(transY0)
|| Double.isNaN(transX1) || Double.isNaN(transY1)) {
return;
}
if (orientation == PlotOrientation.HORIZONTAL) {
state.workingLine.setLine(transY0, transX0,
transY1, transX1);
}
else if (orientation == PlotOrientation.VERTICAL) {
state.workingLine.setLine(transX0, transY0,
transX1, transY1);
}
if (state.workingLine.intersects(dataArea)) {
g2.draw(state.workingLine);
}
}
}
}
}
// we needed to get this far even for invisible items, to ensure that
// seriesPath updates happened, but now there is nothing more we need
// to do for non-visible items...
if (!itemVisible) {
return;
}
}
public Rectangle2D getDataArea() {
return dataArea;
}
public void setDataArea(Rectangle2D dataArea) {
this.dataArea = dataArea;
}
} |
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