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Thread: Map Screen coordinates to 4 sided polygon

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  1. Mar 19th, 2005, 10:19 AM #1
    SLH
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    Map Screen coordinates to 4 sided polygon

    I have a 4 sided polygon on which the user will be able to draw (lines).

    I also want to allow the user to move the vertices of this polygon, and have the drawing alter accordingly. Importantly, i need to know the new position of all the lines once the user has moved the polygon.

    I am thinking that i can use a similar formula to texture mapping, although i'm not very familiar with these.


    Does anyone know what the formulas (sp?) would be for translating a screen coordinate into a 'polygon' coordinate and back again?
    I don't care how the polygon coordinate is stored (2 doubles etc.), as long as i can get back to a screen position.

    Thanks for any help.
    Last edited by SLH; Mar 20th, 2005 at 08:41 AM.
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