Jimmy Johnson wrote:
> I know this is an openGL question, but the openGL newgroup has very little
> activity. I was hoping someone here might be able to shed some light on this
> problem.
>
> I am trying to determine how to draw a dot in openGL (for a class project).
>
> This code will draw a triangle, but why does the for loop not draw a green
> diagonal line? What state in openGL would do that?
>
> int i;
> // float c[] = {(float)$r, (float)$g, (float)$b};
> float c[3];
> c[0] = 0.0;
> c[1] = 1.0;
> c[2] = 0.0;
> for (i = 1; i < 100; i++) {
> glRasterPos2i (i, i);
> glDrawPixels(1, 1, GL_RGB, GL_FLOAT, c);
> };
> glRotatef( 1.0f, 0.0f, 0.0f, 1.0f );
> glBegin( GL_TRIANGLES );
> glColor3f( 1.0f, 0.0f, 0.0f ); glVertex2f( 0.0f, 1.0f );
> glColor3f( 0.0f, 1.0f, 0.0f ); glVertex2f( 0.87f, -0.5f );
> glColor3f( 0.0f, 0.0f, 1.0f ); glVertex2f( -0.87f, -0.5f );
> glEnd();
> glPopMatrix();
>
>
> Thanks and best regards,
>
> Jimmy J. Johnson
I'm not sure, but when working with 3D, it is best to stick to 3D - you
can supposedly simulate 2D sprites in 3D by taking two triangles to make
a square/rectangle and then putting the texture on that. I digress. A
quick Google search turned up:
http://www.c-sharpcorner.com/UploadFile/jeradus/OpenGLBasics11172005014307AM/OpenGLBasics.aspx
While that is for C#, it should be easy to translate to C/C++.
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