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How to compute mouse arrow coordinates to draw on picture? Please help

Hi!

I have main problem in application which draws shapes "by hand" on Pictue Box...

When I'm moving mouse arrow, coordinates of arrow have different values than coordinates of point on the picture box.

I tried to substract form position, substract form edges, divide...

Example: when I move mouse arrow right 20 pixels, coordinates to draw increases 30 pixels... and when I substract form position its near, but not at the same position like mouse arrow...

Please help me anybody, I'm thankful for all.

Miro
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