In Bar chart can I put any image in place of Item label.

[ashish_sriv]

Hi,
I want to put some colored image like filled circle on the top of every bar chart item. Can we do that in JFreeChart?

Thanks

[david.gilbert]

If you need this for every data item, then I'd suggest a customised version of the BarRenderer.

[pin2]

Hi Ashish,
We are stucked to the same kind of problem. If you would have found the solution using BarRenderer. I would really appreciate if you could post the code which will help us for our assignment.
Thanks in advance
Pin2

[ashish_sriv]

I am still in the process, I will surly be sharing the code once it is done.
Thanks,

[ashish_sriv]

Hi Pin,

As suggested by Gilbert I extended the BarRenderer and overridden the method "drawItem".

Here is the overridden code.... Hoping this would work for you too.

public void drawItem(Graphics2D g2, CategoryItemRendererState state, Rectangle2D dataArea, CategoryPlot plot, CategoryAxis domainAxis, ValueAxis rangeAxis, CategoryDataset dataset, int row, int column, int pass)
{


// Thread.dumpStack();
// nothing is drawn for null values...
Number dataValue = dataset.getValue(row, column);
if (dataValue == null) {
return;
}

double value = dataValue.doubleValue();

Paint circleColor = getCircleColor(value);

PlotOrientation orientation = plot.getOrientation();
double barW0 = calculateBarW0(plot, orientation, dataArea, domainAxis,
state, row, column);
double[] barL0L1 = calculateBarL0L1(value);
if (barL0L1 == null) {
return; // the bar is not visible
}

RectangleEdge edge = plot.getRangeAxisEdge();
double transL0 = rangeAxis.valueToJava2D(barL0L1[0], dataArea, edge);
double transL1 = rangeAxis.valueToJava2D(barL0L1[1], dataArea, edge);
double barL0 = Math.min(transL0, transL1);
double barLength = Math.max(Math.abs(transL1 - transL0),
getMinimumBarLength());

// draw the bar...
Rectangle2D bar = null;
Shape indicatorShape = null;
if (orientation == PlotOrientation.HORIZONTAL) {
bar = new Rectangle2D.Double(barL0, barW0, barLength,
state.getBarWidth());
indicatorShape = new Ellipse2D.Double(barL0+barLength-state.getBarWidth(), barW0, state.getBarWidth(),state.getBarWidth());

}
else {
bar = new Rectangle2D.Double(barW0, barL0, state.getBarWidth(),
barLength);
indicatorShape = new Ellipse2D.Double(barW0,barL0, state.getBarWidth(),state.getBarWidth());
}

Paint itemPaint = getItemPaint(row, column);
GradientPaintTransformer t = getGradientPaintTransformer();
if (t != null && itemPaint instanceof GradientPaint) {
itemPaint = t.transform((GradientPaint) itemPaint, bar);
}

g2.setPaint(itemPaint);
g2.fill(bar);
g2.setPaint(circleColor);

g2.fill(indicatorShape);

// draw the outline...
if (isDrawBarOutline()
&& state.getBarWidth() > BAR_OUTLINE_WIDTH_THRESHOLD) {
Stroke stroke = getItemOutlineStroke(row, column);
Paint paint = getItemOutlinePaint(row, column);
if (stroke != null && paint != null) {
g2.setStroke(stroke);
g2.setPaint(paint);
g2.draw(bar);
}
}

CategoryItemLabelGenerator generator
= getItemLabelGenerator(row, column);
if (generator != null && isItemLabelVisible(row, column)) {
drawItemLabel(g2, dataset, row, column, plot, generator, bar,
(value < 0.0));
}

// add an item entity, if this information is being collected
EntityCollection entities = state.getEntityCollection();
if (entities != null) {
addItemEntity(entities, dataset, row, column, bar);
}

}

private Paint getCircleColor(double value)
{
if (value <= 20)
return Color.red;
if (value<=35)
return Color.yellow;
return Color.green;
}


Thanks,
Ashish