test/CubeView.cxx

   1 //
   2 // "$Id: CubeView.cxx 7903 2010-11-28 21:06:39Z matt $"
   3 //
   4 // CubeView class implementation for the Fast Light Tool Kit (FLTK).
   5 //
   6 // Copyright 1998-2010 by Bill Spitzak and others.
   7 //
   8 // This library is free software; you can redistribute it and/or
   9 // modify it under the terms of the GNU Library General Public
  10 // License as published by the Free Software Foundation; either
  11 // version 2 of the License, or (at your option) any later version.
  12 //
  13 // This library is distributed in the hope that it will be useful,
  14 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  15 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16 // Library General Public License for more details.
  17 //
  18 // You should have received a copy of the GNU Library General Public
  19 // License along with this library; if not, write to the Free Software
  20 // Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
  21 // USA.
  22 //
  23 // Please report all bugs and problems on the following page:
  24 //
  25 //     http://www.fltk.org/str.php
  26 //
  27
  28 #include "CubeView.h"
  29 #include <math.h>
  30
  31
  32 #if HAVE_GL
  33 CubeView::CubeView(int x,int y,int w,int h,const char *l)
  34             : Fl_Gl_Window(x,y,w,h,l)
  35 #else
  36 CubeView::CubeView(int x,int y,int w,int h,const char *l)
  37             : Fl_Box(x,y,w,h,l)
  38 #endif /* HAVE_GL */
  39 {
  40     vAng = 0.0;
  41     hAng=0.0;
  42     size=10.0;
  43     xshift=0.0;
  44     yshift=0.0;
  45
  46     /* The cube definition. These are the vertices of a unit cube
  47      * centered on the origin.*/
  48
  49     boxv0[0] = -0.5; boxv0[1] = -0.5; boxv0[2] = -0.5;
  50     boxv1[0] =  0.5; boxv1[1] = -0.5; boxv1[2] = -0.5;
  51     boxv2[0] =  0.5; boxv2[1] =  0.5; boxv2[2] = -0.5;
  52     boxv3[0] = -0.5; boxv3[1] =  0.5; boxv3[2] = -0.5;
  53     boxv4[0] = -0.5; boxv4[1] = -0.5; boxv4[2] =  0.5;
  54     boxv5[0] =  0.5; boxv5[1] = -0.5; boxv5[2] =  0.5;
  55     boxv6[0] =  0.5; boxv6[1] =  0.5; boxv6[2] =  0.5;
  56     boxv7[0] = -0.5; boxv7[1] =  0.5; boxv7[2] =  0.5;
  57
  58 #if !HAVE_GL
  59     label("OpenGL is required for this demo to operate.");
  60     align(FL_ALIGN_WRAP | FL_ALIGN_INSIDE);
  61 #endif /* !HAVE_GL */
  62 }
  63
  64 #if HAVE_GL
  65 void CubeView::drawCube() {
  66 /* Draw a colored cube */
  67 #define ALPHA 0.5
  68     glShadeModel(GL_FLAT);
  69
  70     glBegin(GL_QUADS);
  71       glColor4f(0.0, 0.0, 1.0, ALPHA);
  72       glVertex3fv(boxv0);
  73       glVertex3fv(boxv1);
  74       glVertex3fv(boxv2);
  75       glVertex3fv(boxv3);
  76
  77       glColor4f(1.0, 1.0, 0.0, ALPHA);
  78       glVertex3fv(boxv0);
  79       glVertex3fv(boxv4);
  80       glVertex3fv(boxv5);
  81       glVertex3fv(boxv1);
  82
  83       glColor4f(0.0, 1.0, 1.0, ALPHA);
  84       glVertex3fv(boxv2);
  85       glVertex3fv(boxv6);
  86       glVertex3fv(boxv7);
  87       glVertex3fv(boxv3);
  88
  89       glColor4f(1.0, 0.0, 0.0, ALPHA);
  90       glVertex3fv(boxv4);
  91       glVertex3fv(boxv5);
  92       glVertex3fv(boxv6);
  93       glVertex3fv(boxv7);
  94
  95       glColor4f(1.0, 0.0, 1.0, ALPHA);
  96       glVertex3fv(boxv0);
  97       glVertex3fv(boxv3);
  98       glVertex3fv(boxv7);
  99       glVertex3fv(boxv4);
 100
 101       glColor4f(0.0, 1.0, 0.0, ALPHA);
 102       glVertex3fv(boxv1);
 103       glVertex3fv(boxv5);
 104       glVertex3fv(boxv6);
 105       glVertex3fv(boxv2);
 106     glEnd();
 107
 108     glColor3f(1.0, 1.0, 1.0);
 109     glBegin(GL_LINES);
 110       glVertex3fv(boxv0);
 111       glVertex3fv(boxv1);
 112
 113       glVertex3fv(boxv1);
 114       glVertex3fv(boxv2);
 115
 116       glVertex3fv(boxv2);
 117       glVertex3fv(boxv3);
 118
 119       glVertex3fv(boxv3);
 120       glVertex3fv(boxv0);
 121
 122       glVertex3fv(boxv4);
 123       glVertex3fv(boxv5);
 124
 125       glVertex3fv(boxv5);
 126       glVertex3fv(boxv6);
 127
 128       glVertex3fv(boxv6);
 129       glVertex3fv(boxv7);
 130
 131       glVertex3fv(boxv7);
 132       glVertex3fv(boxv4);
 133
 134       glVertex3fv(boxv0);
 135       glVertex3fv(boxv4);
 136
 137       glVertex3fv(boxv1);
 138       glVertex3fv(boxv5);
 139
 140       glVertex3fv(boxv2);
 141       glVertex3fv(boxv6);
 142
 143       glVertex3fv(boxv3);
 144       glVertex3fv(boxv7);
 145     glEnd();
 146 }//drawCube
 147
 148 void CubeView::draw() {
 149     if (!valid()) {
 150         glLoadIdentity();
 151         glViewport(0,0,w(),h());
 152         glOrtho(-10,10,-10,10,-20050,10000);
 153         glEnable(GL_BLEND);
 154         glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
 155     }
 156
 157     glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
 158
 159     glPushMatrix();
 160
 161     glTranslatef(xshift, yshift, 0);
 162     glRotatef(hAng,0,1,0); glRotatef(vAng,1,0,0);
 163     glScalef(float(size),float(size),float(size));
 164
 165     drawCube();
 166
 167     glPopMatrix();
 168 }
 169 #endif /* HAVE_GL */
 170
 171 //
 172 // End of "$Id: CubeView.cxx 7903 2010-11-28 21:06:39Z matt $".
 173 //