Rotate shape

How can you after you place a shape (a rectangle in this case)on a form when designing the form and rotate it by 45 degrees and then 90 degrees at run time?
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Check out this microsoft article:

HOWTO: Rotate a Bitmap Image in 90-Degree Increments 


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If you need to rotate a shape by an arbitrary angle, you are probably better off using the Polygon API and translating the points according to the angle.

From your other question you can glean how you can actually create the polygon with the API, so I assume that is a known quantity.

Simply refer to the points of the polygon with their carthesian coordinates wrt an origin. Each point has coordinates (x, y)

If you rotate a point through an angle Alpha wrt the origin, its new coordinates will become
(x*cos(Alpha) - y*sin(Alpha), x*sin(Alpha) + y*cos(Alpha))

(I think - check it)

Simply re-calculate all the POINTs in your polygon and redraw.
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Visual Basic Classic

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