image mapping(square to circle)

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Does anybody have any idea about how to map a square image into a circle in visual c++?

basicaly i want to transform whole image

supose there is control point on midddle top edge of image when i moves that control point upward my upper part of image should transform in circular upward direction. and if i moves downward then vice versa!!!!!!

i think its lke cylindrical mapping........

Posted 8-Nov-11 19:36pm

pranav_30

Updated 8-Nov-11 20:14pm

v3

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Andrew Brock 9-Nov-11 1:57am

Be more specific. Are you trying to draw a circle region of a square image to the screen, or are you trying to do a 3D projection to make the square image look like it is a sphere, such as a map of the earth projected into a sphere?

Sergey Alexandrovich Kryukov 9-Nov-11 2:17am

What mapping do you need, exactly?
--SA

pranav_30 9-Nov-11 2:19am

cylindical mapping as well spherical mapping

pranav_30 9-Nov-11 3:08am

plz let me nknow cylindrical mappinng in visual c
++

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Sergey Alexandrovich Kryukov · Answer 1 · 2011-11-08T20:19:00

Solution 1

Seriously? See this: http://en.wikipedia.org/wiki/Squaring_the_circle[^].

—SA

Posted 8-Nov-11 20:19pm

Sergey Alexandrovich Kryukov

Comments

Sergey Alexandrovich Kryukov 9-Nov-11 2:20am

A note for those who was trying to take this seriously: a computer is not a compass with a straightedge. :-)
--SA

pranav_30 9-Nov-11 2:25am

u r not getting i want mapping function for square image to cylindrical and sphericxal

JackDingler · Answer 2 · 2011-11-09T04:26:00

Solution 2

A sphere or cylinder is usually represented as a mesh. To map a square texture to it, you would associate the 3D coordinates of the points of each element in the mesh, with a 2D coordinate in the texture.

There are many ways to create this mapping. Others have provided you with good information on how to do this.

This is an advanced topic, so don't expect a simple answer.

Posted 9-Nov-11 4:26am

JackDingler

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pranav_30 10-Nov-11 0:19am

ok could u provide me any ref abt this mesh mappng

JackDingler 10-Nov-11 8:41am

Several people have already done so.

Here's another.
http://www.opengl.org/code/