chart size params

[june]

I use writeChartAsJPEG(java.io.OutputStream out,
JFreeChart chart,
int width,
int height)
to write the chart onto a output stream.

I wonder what the int width, and height stand for, do they define the size of the image of the chart, and are they in pixels?

thanks

[david.gilbert]

If you follow through the source code, you'll see that the 'height' and 'width' are ultimately used in this method (belonging to the JFreeChart class):

Code: Select all

public BufferedImage createBufferedImage(int width, int height, ChartRenderingInfo info) {

        BufferedImage image = new BufferedImage(width , height, BufferedImage.TYPE_INT_RGB);
        Graphics2D g2 = image.createGraphics();
        draw(g2, new Rectangle2D.Double(0, 0, width, height), info);
        g2.dispose();
        return image;

    }

So it controls the width and height of the image.

[june]

Thanks.

But I still don't know whether the height and width are pixels or not.

I use other tools to draw a same chart with same height and width, I found that the chart drawn with JFreeChart is wider than the one drawn with ChartDirector, a chart api compatible with asp.

thank you.

[david.gilbert]

What values did you use for the width and height, and what is the size of the image (in pixels) generated by JFreeChart?

[june]

I am convinced that the width and height are pixels.
The reason that I thought it is different from the chart drawn with ChartDirector is that I compared the JFreeChart image with a image constrained inside a html td tag.

But do you know how to set a border around the whole chart image?

Thank you.