Continuously scrolling line graph - how do you do this?

Question

I am trying to create a line graph that scrolls to the left over time; just like a resource monitor available on the Linux platform. The graph is long and flat (horizonally) and as system resources are either used or released the graph contiuously displays this with a continuous line that moves from right to left.
Has anyone done something like this before or seen an example of something similar?
So far I have a graph displayed on a panel, but I cannot figure out how to retain the current points plotted, transform the graph to the left and continue the line from that point. I do not want to have to store all the points in an array (or Vector) and plot the entire graph each pass.
Any clues?
thanks,
Lon Allen
Message was edited by:
LonAllen

Answer 1

I went ahead and just set up Arrays to cover the points on the graph and am using drawPolyline(int xpoints[], int ypoints[], int npoints) to do this. I initialized the arrays at the far right bottom point (650, 100) and increment (actually decrement) the x values each pass that I want an update. The y values actually contain useful information so that the graph changes in the vertical as well. I also increment the npoints value to make the graph creep across the graph until all points are filled. I had to delete the amount I wanted the y to change from the initial values since the far right bottom corner is (650, 100). I shift the previous plotted points in the arrays over to the left to get the graph to travel to the left.
Unless you have a better way to do this I guess I've solved my problem.
Lon Allen