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I am trying to simply write anything on the screen. Drawing rectangles is easy enough. I am trying to place a text string sideways superimposed on a "book". It seems very simple and yet...

Just as a note, I tried to take advice from these forums so glDisable(GL_DEPTH_TEST); and glDisable(GL_LIGHTING); are probably not necessary. Additionally, is there a way to enable debugging myself? I am usually a fan of adding cout << "i reached this far yay" << endl; but it doesn't seem to like me when I place it in void Bookshelf()... it gives me a C2381 error ('function' : redefinition; __declspec(noreturn) differs)

main.cpp

#include "bookshelf.h" void Initialize() { glClearColor (1.0, 1.0, 1.0, 0.0 ); glMatrixMode( GL_PROJECTION ); glOrtho(0,899,899,0,1,0); } void main( int argc, char *argv[] ) { glutInit( &argc, argv ); glutInitDisplayMode( GLUT_SINGLE | GLUT_RGB ); glutInitWindowSize( 900, 900 ); glutInitWindowPosition( 510, 100 ); glutCreateWindow("Bookshelf - Ankit Ahuja"); Initialize(); glutDisplayFunc(Bookshelf); glutMainLoop(); }

bookshelf.h

#include <GL/glut.h> void Bookshelf() { glClear( GL_COLOR_BUFFER_BIT ); glColor3f( 0.0, 0.0, 0.0 ); glBegin( GL_QUADS ); //Code that draws a bookshelf //Book1 glColor3f( 1.0, 0.25, 0.25 ); glVertex3i(240,70,0.5); glVertex3i(260,70,0.5); glVertex3i(260,180,0.5); glVertex3i(240,180,0.5); //BookTitle1 glPushMatrix(); glLoadIdentity(); glDisable(GL_DEPTH_TEST); glRotatef(90f,0.0f,0.0f,0.0f); glColor3f( 0.0, 1.0, 0.0 ); glDisable(GL_LIGHTING); glRasterPos3i(100,100,1); char text[50]="Alphabet Soup is the best guys"; for(int i=0; i<50; i++) { glutBitmapCharacter(GLUT_BITMAP_9_BY_15,(int)text[i]); } glPopMatrix(); //Book2 glColor3f( 0.8, 0.8, 0.0 ); glVertex2i(270,70); glVertex2i(290,70); glVertex2i(290,180); glVertex2i(270,180); //More books and shelves glEnd(); glFlush(); }
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  • Please properly format your code Commented Sep 25, 2012 at 22:04
  • What have you been able to draw to the screen? What exactly do you want drawn? If you provide some small thumbnails (even hand-drawn) of what is drawing and what isn't, it will better indicate the problems you are having. Commented Sep 25, 2012 at 22:56
  • I can draw all the rectangles without a problem, and have them filled in as intended, I just get stuck on the text part. Commented Sep 26, 2012 at 3:02
  • i47.tinypic.com/8zl95e.png is the portion of the project I can successfully create Commented Sep 26, 2012 at 4:12
  • update: text shows up but it is still not rotated properly Commented Sep 26, 2012 at 4:45

1 Answer 1

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You should set-up an orthographic projection by using the glOrtho before displaying your text.

Make sure you correctly push/pop the projection and modelview matrix before writing ur text so you are looking at something like:

glMatrixMode(GL_PROJECTION); //Select projection matrix glPushMatrix(); //save it glLoadIdentity(); glMatrixMode(GL_MODELVIEW); //Select modelview matrix glPushMatrix(); //save it glLoadIdentity(); // set up ur glOrtho glOrtho(...); glutBitmapCharacter(...) glMatrixMode(GL_PROJECTION); glPopMatrix(); //Restore your old projection matrix glMatrixMode(GL_MODELVIEW); glPopMatrix(); //Restore old modelview matrix
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4 Comments

this worked. However, do you have any idea how I can now rotate the text string?
use the glRotatef around your view axis if u want in 2d
unfortunately, glRotatef in any form is not working. after doing more research, i'm not sure it's possible. is there an alternative to glutBitmapCharacter that will rotate?
ok i find out it is not possible; try to use free font instead. There is a tut on nehe about this nehe.gamedev.net/tutorial/2d_texture_font/18002 you might find some more recent tut on google about this

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