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c++graphicsplotrenderdirect2d

Direct2D overwrite on existing content

I am developing a "Plot XY" (like in MatLAB) using Direct2D, where my requirement is, during the simulation (take about 5 - 10 minutes) I need to plot Y Values in a fixed X-axis. Since the X-Axis doesn't change, I need to plot the new Y-values on the fixed X-Axis without deleting the old Y-Values on the screen (BitMap or so).

The problem with the Direct2D is, every time
Before drawing one dot, I need to

pRenderTarget->BeginDraw();

and After plotting the dot, I need to 

hr = pRenderTarget->EndDraw();

Because of this, I'm losing the old values. Any suggestions how to approach this situation?

Solution

  • I don't know how to close this question, as the answer can be found here: Direct2D - preserve the existing content and overwrite the new values