draw

I have 2 questions 1)I am trying to draw an arc on an XYplot using the shape annotation. I used the XYLine annotation to draw a line and I want the arc to start where the line ends. I am having some issues with the parameters.I want the arc to have a height of 17, width 44, and start at the point(3.0, 17) of the plot(this is where the line ends). But the code below does not work. Can someone please tell me what is wrong with the code? Arc2D.Double arc = new Arc2D.Double(3.0, 16.9, 44.0, 17.04, 180.0, 180.0, Arc2D.OPEN ); plot.addAnnotation(new XYShapeAnnotation(arc, new BasicStroke(2.0f),

Does anyone know how I can get started to draw a polar graph in java and plot some points on this graph? I mean the circles and lines, I wish to do this with something like swing, and not use any library like Jfreechart Thanks You might like to look at Lissajous curves ; an example of a = 5, b = 4 (5:4) is shown below. Addendum: Once you see how to plot points in xy coordinates, then you should look at converting between polar and Cartesian coordinates . public class LissajousPanel extends JPanel { private static final int SIZE = 400; private GeneralPath path = new GeneralPath(); @Override

In the image the red trail is a trail that pygame is creating when I have a bounding rectangle added around sprites. The sprite also does it and the simplest solution was to just clear the surface to black after each redraw. However attempting to do so on the entire main surface is not such a good idea. How can I fix this? ninMonkey Normally you will do: def draw(): # fill screen with solid color. # draw, and flip/update screen. But, you can update just dirty portions of the screen. See pygame.display.update() : pygame.display.update() Update portions of the screen for software displays update