2D proportional point plots

Math and Physics Programming

Started by Wizumwalt February 26, 2011 09:35 PM

0 comments, last by Buckeye 13 years, 1 month ago

161

Author

February 26, 2011 09:35 PM

Hi,

I have a set of 2D points to plot. Each set can contain any range of values. The bounds of my window can be resized to change also.

My problem is that I can't find a formula that will proportionally plot my points in the canvas space correctly no matter what the window size or range of values are.

Can anyone help w/ this formula?

Buckeye

10,754

February 26, 2011 10:28 PM

Determine the minimum and maximum X values and Y values of your 2D points. Calculate 2 ratios like so:



float xratio = float(windowWidth)/(pt2DmaxX - pt2DminX);

float yratio = float(windowHeight)/(pt2DmaxY - pt2DminY);



// plot each point pt( x, y )

int windowX = int( (pt.x - pt2DminX) * xratio );

int windowY = int( (pt.y - pt2DminY) * yratio );

That's off the top of my head so look it over.

Please don't PM me with questions. Post them in the forums for everyone's benefit, and I can embarrass myself publicly.

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2D proportional point plots

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