I am planning to develop a XY Plotter for my application. To give some basic idea, how it should look like (of course the implementation would be different), please refer here and here.
During the simulation (let's assume, it takes 4 hours to complete the simulation), on a fixed X axis, the new Y values should be (over)written.
But, the problem with Direct2D is that, every time pRenderTarget->BeginDraw() is called, the existing Drawing(/Plot/BitMap/Image, etc) is deleted and a new image is being drawn. Therefore I would lose the old values.
Of course, I can always buffer the old Y values in a buffer/variable and use it in the next drawing. But, the simulation runs for 4 hours and unfortunately I can't afford to save all the Y values. That's why, I need to render/draw the new Y values on the existing target-image/plot/etc.
And, If don't call pRenderTarget->EndDraw() within a definite amount of time, my application would crash due to resource constraints.
How do I prevent this problem and achieve the requirement?
