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newbee questions about GLortho

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Hi... i''m new in OpenGL I''m trying to do a simple 2D math equation editor... It must have the posibility of doing ZOOMs I thinks it must be done changing coords of GLOrtho2D... but I''m not sure... I don''t know so well the structure that must be done... load which matrix, etc :S Some one can help me ?? thanxs

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Guest Anonymous Poster
First of all, there is no glOrtho2D().
However, there are glOrtho() and gluOrtho2D().
gluOrtho2D() is the same thing as calling glOrtho() with near=0 and far=1.

glMatrixMode( GL_PROJECTION );
glOrtho( GLdouble left,
GLdouble right,
GLdouble bottom,
GLdouble top,
GLdouble near,
GLdouble far );
// make the values of left-right and top-bottom farther away
// from eachother to zoom out
// (e.g. left = bottom = -100.0; right = top = 100.0)

// closer values will zoom in
// (e.g. left = bottom = -1.0; right = top = 1.0)

// don''t forget to go back to the modelview matrix when you are done:
glMatrixMode( GL_MODELVIEW );

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