I will do a small software that plot a 2D function curve use openGL , feasible ?

[cnchip]

1,  I have a lot of sample data, it can be plot a 2D dot distribution map.

2, then, I need fit a function curve,such as:

3,then , I need got the point of intersection coordinate (x0, y0)

4,then if I can create a vertical line on X axis what it can to left or right free move by mouse,

then I can got other point coordinate,such as (x1,y1) and (x1,y2)

5, even  I can also get a function formula ,such as f1(x) and f2(x).

Would you please give me a little suggest ?

Thanks a lot !

[RobertoBozzolo · Accepted solution]

CVI can use OpenGL functions: there is a specific OpenGL instrument located in <CVIfolder>\toolslib\custctrl\cviogl.fp. There is also an example program that makes use of OGL functions to plot 3D sufraces: see the code in <CVISampleFolder>\apps\oglscxi fodler.

Having said this, since you are dealing with 2D plots, do you really need OpenGL? All the steps you have listed above could be addressed with standard CVI functions: as an example you can use a properly formatted PlotXY () call to plot curves as in step #1, PolyFit () to calculate the interpolant in step #2 (which also goves you the formula as in step #5) and cursors to do plot searching as in step #4.

[cnchip]

Thank you very much for your suggest and reply. If use PlotXY() to plot curves, it can free move and zoom in and out based mouse ? I have been looking for some example. Thank you again.

[cnchip]

Thank you again.

I will give up openGL, that is too complicated.

Would you please help me on the other question ?

http://forums.ni.com/t5/LabWindows-CVI/%E4%B8%BA%E4%BB%80%E4%B9%88%E6%88%91%E4%B8%8D%E8%83%BD%E7%BC%...

[RobertoBozzolo]

Yes, I have just answered there 

[cnchip]

Thank you again. Exhilarating...