git.mutantstargoat.com Git - freeglut/blob - progs/demos/Resizer/Resizer.cpp

   1 #include <stdio.h>\r
   2 \r
   3 #include <GL/freeglut.h>\r
   4 \r
   5 int nWindow, nChildWindow = -1;\r
   6 int nLoopMain = 0;\r
   7 \r
   8 int nPosX,  nPosY;\r
   9 int nWidth, nHeight;\r
  10 \r
  11 GLboolean bChildPosDone = GL_FALSE, bChildSizeDone = GL_FALSE;\r
  12 \r
  13 void SampleKeyboard( unsigned char cChar, int nMouseX, int nMouseY );\r
  14 void Redisplay();\r
  15 void Reshape(int x, int y);\r
  16 \r
  17 \r
  18 \r
  19 \r
  20 void DrawQuad()\r
  21 {\r
  22     nWidth  = glutGet(GLUT_WINDOW_WIDTH);\r
  23     nHeight = glutGet(GLUT_WINDOW_HEIGHT);\r
  24 \r
  25     glBegin(GL_QUADS);\r
  26         glVertex2d(nWidth*.25, nHeight*.75);\r
  27         glVertex2d(nWidth*.75, nHeight*.75);\r
  28         glVertex2d(nWidth*.75, nHeight*.25);\r
  29         glVertex2d(nWidth*.25, nHeight*.25);\r
  30     glEnd();\r
  31 }\r
  32 \r
  33 void SampleKeyboard( unsigned char cChar, int nMouseX, int nMouseY )\r
  34 {\r
  35     switch (cChar)\r
  36     {\r
  37     case 27:\r
  38         glutLeaveMainLoop();\r
  39 \r
  40         break;\r
  41 \r
  42 \r
  43     case 'f':\r
  44     case 'F':\r
  45         printf("main window toggle fullscreen\n");\r
  46         glutFullScreenToggle();\r
  47 \r
  48         break;\r
  49 \r
  50 \r
  51     case 'r':\r
  52     case 'R':\r
  53         if (nChildWindow!=-1)\r
  54         {\r
  55             glutSetWindow(nChildWindow);\r
  56             printf("child window resize\n");\r
  57             if (!bChildSizeDone)\r
  58                 glutReshapeWindow(glutGet(GLUT_WINDOW_WIDTH)+50,glutGet(GLUT_WINDOW_HEIGHT)+50);\r
  59             else\r
  60                 glutReshapeWindow(glutGet(GLUT_WINDOW_WIDTH)-50,glutGet(GLUT_WINDOW_HEIGHT)-50);\r
  61             bChildSizeDone = !bChildSizeDone;\r
  62         }\r
  63         else\r
  64         {\r
  65             printf("main window resize\n");\r
  66             if (nWidth<400)\r
  67                 glutReshapeWindow(600,300);\r
  68             else\r
  69                 glutReshapeWindow(300,300);\r
  70         }\r
  71 \r
  72         break;\r
  73 \r
  74 \r
  75     case 'm':\r
  76     case 'M':\r
  77         if (nChildWindow!=-1)\r
  78         {\r
  79             glutSetWindow(nChildWindow);\r
  80 \r
  81             /* The window position you request is relative to the top-left\r
  82              * corner of the client area of the parent window.\r
  83              */\r
  84             if (!bChildPosDone)\r
  85                 glutPositionWindow(glutGet(GLUT_WINDOW_X)+50,glutGet(GLUT_WINDOW_Y)+50);\r
  86             else\r
  87                 glutPositionWindow(glutGet(GLUT_WINDOW_X)-50,glutGet(GLUT_WINDOW_Y)-50);\r
  88             bChildPosDone = !bChildPosDone;\r
  89         }\r
  90         else\r
  91         {\r
  92             printf("main window position\n");\r
  93 \r
  94             /* The window position you request is the outer top-left of the window,\r
  95              * the client area is at a different position if the window has borders\r
  96              * and/or a title bar.\r
  97              */\r
  98             if (nPosX<400)\r
  99                 glutPositionWindow(600,300);\r
 100             else\r
 101                 glutPositionWindow(300,300);\r
 102         }\r
 103 \r
 104         break;\r
 105 \r
 106 \r
 107     case 'c':\r
 108     case 'C':\r
 109         if (nChildWindow==-1)\r
 110         {\r
 111             /* open child window */\r
 112             printf("open child window\n");\r
 113             nWidth  = glutGet(GLUT_WINDOW_WIDTH);\r
 114             nHeight = glutGet(GLUT_WINDOW_HEIGHT);\r
 115 \r
 116             nChildWindow = glutCreateSubWindow(nWindow,(int)(nWidth*.35),(int)(nHeight*.35),(int)(nWidth*.3),(int)(nHeight*.3));\r
 117             glutKeyboardFunc( SampleKeyboard );\r
 118             glutDisplayFunc( Redisplay );\r
 119             glutReshapeFunc( Reshape );\r
 120         }\r
 121         else\r
 122         {\r
 123             /* close child window */\r
 124             printf("close child window\n");\r
 125             glutSetWindow(nWindow);\r
 126             glutDestroyWindow(nChildWindow);\r
 127             nChildWindow = -1;\r
 128             bChildSizeDone = GL_FALSE;\r
 129             bChildPosDone  = GL_FALSE;\r
 130         }\r
 131         break;\r
 132 \r
 133 \r
 134     default:\r
 135         break;\r
 136     }\r
 137 }\r
 138 \r
 139 void Idle(void)\r
 140 {\r
 141     glutPostRedisplay();\r
 142 }\r
 143 \r
 144 void Reshape(int width, int height)\r
 145 {\r
 146     int win = glutGetWindow();\r
 147 \r
 148     printf("reshape %s, %dx%d\n",win==nWindow?"main":"child",\r
 149         width, height);\r
 150 \r
 151     glViewport(0,0,width,height);\r
 152     glMatrixMode(GL_PROJECTION);\r
 153     glLoadIdentity();\r
 154     gluOrtho2D(0,width,0,height);\r
 155 \r
 156     if (win==nWindow && nChildWindow!=-1)\r
 157     {\r
 158         glutSetWindow(nChildWindow);\r
 159         glutPositionWindow((int)(width*.35),(int)(height*.35));\r
 160         glutReshapeWindow((int)(width*.3),(int)(height*.3));\r
 161         glutSetWindow(nWindow);\r
 162     }\r
 163 }\r
 164 \r
 165 void Position(int x, int y)\r
 166 {\r
 167     int win = glutGetWindow();\r
 168 \r
 169     printf("position %s, %dx%d\n",win==nWindow?"main":"child",\r
 170         x, y);\r
 171 }\r
 172 \r
 173 void Redisplay(void)\r
 174 {\r
 175     int win = glutGetWindow();\r
 176 \r
 177     if (nLoopMain++%20==0)\r
 178     {\r
 179         int border, caption;\r
 180 \r
 181         nPosX   = glutGet(GLUT_WINDOW_X);\r
 182         nPosY   = glutGet(GLUT_WINDOW_Y);\r
 183         nWidth  = glutGet(GLUT_WINDOW_WIDTH);\r
 184         nHeight = glutGet(GLUT_WINDOW_HEIGHT);\r
 185         border  = glutGet(GLUT_WINDOW_BORDER_WIDTH);\r
 186         caption = glutGet(GLUT_WINDOW_HEADER_HEIGHT);\r
 187         /* returned position is top-left of client area, to get top-left of\r
 188          * of window you'll need to add the size of the border and caption\r
 189          * of the current window (can be 0).\r
 190          * Note that the window position is not necessarily positive (e.g.\r
 191          * when the window is on a monitor to the left of the primary monitor\r
 192          * or simply when maximized--try pressing the maximize button).\r
 193          * the returned size is the size of the client area\r
 194          * Note that the top-left of a child window is relative to the\r
 195          * top-left of the client area of the parent.\r
 196          */\r
 197         /* printf("window border: %dpx, caption: %dpx\n",border,caption); */\r
 198         if (win==nWindow)\r
 199             printf("main  window %dx%d, top-left of client at: (%d,%d), of window at: (%d,%d)\n",\r
 200                 nWidth, nHeight,\r
 201                 nPosX ,nPosY,\r
 202                 nPosX-border,\r
 203                 nPosY-border-caption);\r
 204         else\r
 205             printf("child window %dx%d, top-left of client at: (%d,%d), relative to parent\n",\r
 206             nWidth, nHeight,\r
 207             nPosX ,nPosY);\r
 208     }\r
 209 \r
 210     if (win==nWindow)\r
 211     {\r
 212         glClearColor(.2f,0.f,0.f,0.f);\r
 213         glColor3f(1,1,1);\r
 214     }\r
 215     else\r
 216     {\r
 217         /* child window */\r
 218         glClearColor(.0f,.2f,0.f,0.f);\r
 219         glColor3f(.5,.5,.5);\r
 220         glutPostWindowRedisplay(nWindow);\r
 221     }\r
 222     glClear(GL_COLOR_BUFFER_BIT);\r
 223     DrawQuad();\r
 224 \r
 225     glutSwapBuffers();\r
 226     glutPostWindowRedisplay(win);\r
 227 }\r
 228 \r
 229 \r
 230 int main(int argc, char* argv[])\r
 231 {\r
 232     int border, caption;\r
 233     glutInit( &argc, argv );\r
 234     glutInitDisplayMode( GLUT_RGB | GLUT_DOUBLE /*| GLUT_BORDERLESS*/); // do try as well with GLUT_BORDERLESS and GLUT_CAPTIONLESS\r
 235     glutSetOption(GLUT_ACTION_ON_WINDOW_CLOSE,GLUT_ACTION_GLUTMAINLOOP_RETURNS);\r
 236     \r
 237     /* Get border and caption size of default window style */\r
 238     border  = glutGet(GLUT_WINDOW_BORDER_WIDTH);\r
 239     caption = glutGet(GLUT_WINDOW_HEADER_HEIGHT);\r
 240     printf("default window style border: %dpx, caption: %dpx\n",border,caption);\r
 241 \r
 242     /* NB: The window position you request is the outer top-left of the\r
 243      * window, the client area is at a different position if the window has\r
 244      * borders and/or a title bar.\r
 245      */\r
 246     glutInitWindowPosition(150,250);\r
 247     glutInitWindowSize(200,200);\r
 248 \r
 249     nWindow = glutCreateWindow("test");\r
 250     printf("main window id: %d\n", nWindow);\r
 251 \r
 252     glutKeyboardFunc( SampleKeyboard );\r
 253     glutDisplayFunc( Redisplay );\r
 254     glutReshapeFunc( Reshape );\r
 255     glutPositionFunc( Position );\r
 256 \r
 257     glutMainLoop();\r
 258     printf("glutMainLoop returned\n");\r
 259 \r
 260     return EXIT_SUCCESS;\r
 261 }