To change the X-axis starting value of graph in Jfreechart

Question

I am calculating histogram of red component of the image and stored it in redhisto[]. The index of the array represent the intensity(0 to 255) and the value represent the n

Answer 1

You can change the lower bound of the domain axis and set the series paint as shown below. The default XYBarPainter has a gradient color highlight, so I used a StandardXYBarPainter.

XYPlot plot = (XYPlot) chart.getPlot();
ValueAxis axis = plot.getDomainAxis();
axis.setLowerBound(0);
XYBarRenderer r = (XYBarRenderer) plot.getRenderer();
r.setBarPainter(new StandardXYBarPainter());
r.setSeriesPaint(0, Color.blue);

Answer 2

    XYPlot plot = (XYPlot) chart.getPlot();  

    //To change the lower bound of X-axis
    NumberAxis xAxis = (NumberAxis) plot.getDomainAxis();
    xAxis.setLowerBound(0);

    //To change the lower bound of Y-axis       
    NumberAxis yAxis = (NumberAxis) plot.getRangeAxis();
    yAxis.setLowerBound(0);

    // To change the color
    XYItemRenderer renderer = plot.getRenderer();
    renderer.setSeriesPaint(0, Color.green);