@prasath.t - It certainly looks like this is possible. To get you started, below is an example of how to extend the BarRenderer class using the configureChart extension function. In the example, I use a variable called barStartingLocation to set the beginning point of each bar, and then I use a barScaleParameter to adjust the width of the bar. For both variables, I have just stuck in numbers to illustrate the effect, but it shouldn't be too difficult to develop a way to loop through each row in the chart's dataset and dynamically adjust these variables. I have also added code to change the color of each bar to make it easier to see what is actually being accomplished.
Here is the code:
from org.jfree.chart.renderer.category import BarRenderer, StandardBarPainter
from java.awt import Color
chart.setTitle("Histogram")
class DynamicWidthRenderer(BarRenderer):
def calculateBarW0(BarRenderer, plot, orientation, dataArea, domainAxis, state, row, column):
if column == 0:
barStartingLocation = 82
barScaleParameter = 100
dataArea.width = barScaleParameter
BarRenderer.calculateBarWidth(plot, dataArea, 0, state)
return barStartingLocation
elif column == 1:
barStartingLocation = 100
barScaleParameter = 600
dataArea.width = barScaleParameter
BarRenderer.calculateBarWidth(plot, dataArea, 0, state)
return barStartingLocation
elif column == 2:
barStartingLocation = 212
barScaleParameter = 2600
dataArea.width = barScaleParameter
BarRenderer.calculateBarWidth(plot, dataArea, 0, state)
return barStartingLocation
else:
barStartingLocation = 699
barScaleParameter = 867.030849457
dataArea.width = barScaleParameter
BarRenderer.calculateBarWidth(plot, dataArea, 0, state)
return barStartingLocation
def getItemPaint(BarRenderer, row, column):
if column == 0:
return Color.orange
elif column == 1:
return Color.gray
elif column == 2:
return Color.red
else:
return Color.blue
chart.getCategoryPlot().setRenderer(DynamicWidthRenderer())
chart.getCategoryPlot().getRenderer().setBarPainter(StandardBarPainter())
chart.getCategoryPlot().getRenderer().setShadowVisible(False)
The preceding code produces the following result:
