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Rotating Vector

Started by NoNseNse Oct 20, 2000 at 8:12 AM 0 replies 400+ views

Original Post

Oct 20, 2000 at 8:12 AM

I''m using a 2d-vector to do my colision detection in my game, so it''s ellipses which I collide. Works great, but only if the objects are on 0 or 180 degrees rotation. I lack the code to rotate the vector around the z-axis. I know the respective 4x4-matrix, but don''t know what to multiply with what. So any help is appreciated, THX,, NoNseNse

acw83

Oct 20, 2000 at 5:07 PM

You don''t really need matrices for a 2d rotation.

new_x = old_x * cos(angle*180/3.14159) - old_y * sin(angle*180/3.14159);
new_y = old_x * sin(angle*180/3,14159) + old_y * cos(angle*180/3.14159);

Hope that helps.

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