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GDI+ Finding Fourth Rotation-Matrix-Point

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RMS001

RMS001

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Nov 12, 2002
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Hi

Has anyone had to find the fourth point in a rotation matrix given: x1 and y1, x2 and y2, x3 and y3. GDI+ provides DrawImagePoints which is passed an array of three points. Does anyone know the formula to find the fourth point's x and y at any angle in the rotation?

Thanks - Ron
 
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