131 lines
3.3 KiB
C++
131 lines
3.3 KiB
C++
/*
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* tutorial2.cpp: Tutorial for the OGLFT library
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* Copyright (C) 2002 lignum Computing, Inc. <oglft@lignumcomputing.com>
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* $Id: tutorial2.cpp,v 1.5 2003/10/01 14:09:12 allen Exp $
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <iostream>
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using namespace std;
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#include <GL/glut.h>
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#include <config.h>
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#include <OGLFT.h> // Note: this will depend on where you've installed OGLFT
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#define USE_BITMAP_FACE
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// Declare a Face variable of the desired style
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#if defined( USE_BITMAP_FACE )
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OGLFT::Monochrome* face;
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#else
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OGLFT::Filled* face;
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#endif
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void init ( const char* filename )
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{
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// Create a new face given the font filename and a size
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#if defined( USE_BITMAP_FACE )
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face = new OGLFT::Monochrome( filename, 36 );
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#else
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face = new OGLFT::Filled( filename, 36 );
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#endif
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// Always check to make sure the face was properly constructed
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if ( face == 0 || !face->isValid() ) {
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std::cerr << "Could not construct face from " << filename << std::endl;
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return;
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}
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// Set the face color to red
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face->setForegroundColor( 1., 0., 0. );
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// Use centered justification
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face->setHorizontalJustification( OGLFT::Face::CENTER );
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// For the raster styles, it is essential that the pixel store
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// unpacking alignment be set to 1
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glPixelStorei( GL_UNPACK_ALIGNMENT, 1 );
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// Set the window's background color
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glClearColor( .75, .75, .75, 1. );
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}
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static void display ( void )
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{
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// First clear the window ...
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glClear( GL_COLOR_BUFFER_BIT );
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// ... then draw the string
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face->draw( 250., 250., "Hello, World!" );
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glutSwapBuffers();
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}
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static void reshape ( int width, int height )
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{
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glViewport( 0, 0, width, height );
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glMatrixMode( GL_PROJECTION );
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glLoadIdentity();
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glOrtho( 0, width, 0, height, -1, 1 );
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glMatrixMode( GL_MODELVIEW );
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glLoadIdentity();
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}
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static void idle ( void )
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{
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// Retrieve the current value of the string's rotation and increment
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// it by 4 degrees
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face->setStringRotation( face->stringRotation() + 4 );
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// Too fast even without acceleration
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struct timespec request = { 0, 40000000 };
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nanosleep( &request, 0 );
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glutPostRedisplay();
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}
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int main ( int argc, char* argv[] )
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{
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// Check to be sure the user specified something as a font file name
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if ( argc != 2 ) {
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std::cerr << "usage: " << argv[0] << " fontfile" << std::endl;
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return 1;
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}
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// Standard GLUT setup commands
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glutInit( &argc, argv );
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glutInitWindowSize( 500, 500 );
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glutInitDisplayMode( GLUT_RGB | GLUT_DOUBLE ); // Note: OGLFT really only works in RGB mode
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glutCreateWindow( argv[0] );
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init( argv[1] );
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glutReshapeFunc( reshape );
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glutDisplayFunc( display );
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glutIdleFunc( idle );
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glutMainLoop();
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return 0;
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}
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