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Doing a loop with Lines

Started by porra May 18, 2003 at 10:03 PM 1 reply 300+ views

Original Post

porra

May 18, 2003 at 10:03 PM

hi there, firstly, sorry ''bout my english eheeh

i''m new trying to learn how opengl works.. i''m trying to make a tunnel.. made of lines... i made 4 quads with lines and i want to those quads to come closer, incrementing a variable but there is one problem, when those quads come closer, i don''t know how to make new ones appear starting from the center of the screen and moving like others.. i''ll post my code here int DrawGLScene(GLvoid) { glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); glLoadIdentity(); glTranslatef(0.0f,0.0f,zoom); glColor3f(1.0f,0.0f,0.0f); glBegin(GL_LINES); glVertex3f(-u+2.0f,-u+2.0f,0.0f); glVertex3f( u-2.0f,-u+2.0f,0.0f); glVertex3f( u-2.0f, u-2.0f,0.0f); glVertex3f(-u+2.0f, u-2.0f,0.0f); glVertex3f( u-2.0f,-u+2.0f,0.0f); glVertex3f( u-2.0f, u-2.0f,0.0f); glVertex3f(-u+2.0f, u-2.0f,0.0f); glVertex3f(-u+2.0f,-u+2.0f,0.0f); glVertex3f(-u+4.0f,-u+4.0f,0.0f); glVertex3f( u-4.0f,-u+4.0f,0.0f); glVertex3f( u-4.0f, u-4.0f,0.0f); glVertex3f(-u+4.0f, u-4.0f,0.0f); glVertex3f( u-4.0f,-u+4.0f,0.0f); glVertex3f( u-4.0f, u-4.0f,0.0f); glVertex3f(-u+4.0f, u-4.0f,0.0f); glVertex3f(-u+4.0f,-u+4.0f,0.0f); glVertex3f(-u+6.0f,-u+6.0f,0.0f); glVertex3f( u-6.0f,-u+6.0f,0.0f); glVertex3f( u-6.0f, u-6.0f,0.0f); glVertex3f(-u+6.0f, u-6.0f,0.0f); glVertex3f( u-6.0f,-u+6.0f,0.0f); glVertex3f( u-6.0f, u-6.0f,0.0f); glVertex3f(-u+6.0f, u-6.0f,0.0f); glVertex3f(-u+6.0f,-u+6.0f,0.0f); glVertex3f(-u+7.9f,-u+7.9f,0.0f); glVertex3f( u-7.9f,-u+7.9f,0.0f); glVertex3f( u-7.9f, u-7.9f,0.0f); glVertex3f(-u+7.9f, u-7.9f,0.0f); glVertex3f( u-7.9f,-u+7.9f,0.0f); glVertex3f( u-7.9f, u-7.9f,0.0f); glVertex3f(-u+7.9f, u-7.9f,0.0f); glVertex3f(-u+7.9f,-u+7.9f,0.0f); glVertex3f( 0.1f, 0.1f,0.0f); glVertex3f( 8.0f, 8.0f,0.0f); glVertex3f(-0.1f,-0.1f,0.0f); glVertex3f(-8.0f,-8.0f,0.0f); glVertex3f( 0.1f,-0.1f,0.0f); glVertex3f( 8.0f,-8.0f,0.0f); glVertex3f(-0.1f, 0.1f,0.0f); glVertex3f(-8.0f, 8.0f,0.0f); glEnd(); u+=0.01f; return TRUE; } i think it''s quite simple, but i didn''t get

thanks

dede

May 19, 2003 at 12:07 AM

This is one way to do it.

Do this, it will be much simpler


place = 0;
While(1)
{
place++;

drawQuads();

if(place > overlapped)
   place = 0;
}

So you have to think about your quads as "blinking" christmas tree lights. they repeat the same frames over and over again, but because they are turning on and off, it looks as if they are traveling.

porra

Author

porra

May 20, 2003 at 8:58 PM

but where can i put the swapbuffer(hdc); command?

at nehe''s tutorial it comes after drawglscene();

how can i do it with this loop?

thanks

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