first commit

CS4451/oglexamples/3d.c

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+#ifdef _WIN32
+#include <windows.h>
+#endif
+#include <GL/glut.h> // glut.h already includes GL/gl.h and GL/glu.h
+#include <stdlib.h>
+#include <stdio.h>
+
+/* you may need to locate glut.h on your computer and change the path accordingly.
+ * It is most likely in ~/include or ~include/GL.
+ */
+
+/* the viewport is 500x500 with the origin at (0,0) */
+int Vx_min=0, Vx_max=500, Vy_min=0, Vy_max=500, Vz_min=0, Vz_max=0;
+
+int frame_width, frame_height;
+
+
+void init(void) 
+{
+   glClearColor (0.0, 0.0, 0.0, 0.0);
+}
+
+void display(void)
+{
+	glClear (GL_COLOR_BUFFER_BIT);   
+
+	/* green */
+	glColor3f(0.0,1.0,0.0); /* params are floats in range [0.0,1.0] */
+
+	/* draws one or more lines */
+	glBegin(GL_LINES);
+		/* params are floats */
+		glVertex2f(-150.0, -150.0); /* 2d floats (z=0) */
+		glVertex2f( 150.0, -150.0);
+
+		/* params are integers */
+		glVertex2i(150, -150); 
+		glVertex2i(150, 150);
+	
+		/* params are doubles */
+		glVertex2d(150.0, 150.0); 
+		glVertex2d(-150.0, 150.0);
+	
+		/* params are floats */
+		glVertex2f(-150.0, 150.0);
+		glVertex2f(-150.0, -150.0);
+	glEnd();
+
+	/* blue */
+	glColor3ub(0,0,255); /* params are unsigned bytes in range [0,255] */
+
+	/* draws one polygon */
+	glBegin(GL_POLYGON);
+		glVertex2i(-125, -125);
+		glVertex2i(125, -125);
+		glVertex2i(125, 125);
+		glVertex2i(-125, 125);
+	glEnd();
+
+
+	/* black */
+	glColor3f(0.0,0.0,0.0); /* params are floats in range [0.0,1.0] */
+
+	/* draws one or more triangles */
+	glBegin(GL_TRIANGLES);
+		glVertex2i(-100, -100);
+		glVertex2i(100, -100);
+		glVertex2i(0, 100);
+
+	glEnd();		
+	glColor3f(1.0,0.0,0.0);
+	glBegin(GL_TRIANGLES);
+		glVertex2i(-100, -100);
+		glVertex2i(-100, 100);
+		glVertex2i(100, 0);
+	glEnd();		
+
+	glFlush ();
+}
+
+void reshape (int w, int h)
+{
+   frame_width = w;
+   frame_height = h;
+   
+   glViewport (0, 0, (GLsizei) w, (GLsizei) h); 
+   glMatrixMode (GL_PROJECTION);
+   glLoadIdentity ();
+
+//   gluOrtho2D(Vx_min, Vx_max, Vy_min, Vy_max); // 2d
+   glFrustum (-1.0, 1.0, -1.0, 1.0, 1.5, 500.0); // 3d
+
+   glMatrixMode (GL_MODELVIEW);
+   glLoadIdentity(); // 3d
+   gluLookAt (0.0, 0.0, 375.0, 0.0, 0.0, 0.0, 0.0, 1.0, 0.0); // 3d
+
+
+}
+void mouse(int button, int state, int x, int y)
+{
+
+   switch (button) {
+      case GLUT_LEFT_BUTTON:
+		  if (state == GLUT_DOWN) {
+			printf("left mouse click\n");
+			glutPostRedisplay();
+		  }
+         break;
+      default:
+         break;
+   }
+}
+
+int main(int argc, char** argv)
+{
+   glutInit(&argc, argv);
+   glutInitDisplayMode (GLUT_SINGLE | GLUT_RGB);
+   glutInitWindowSize (Vx_max-Vx_min, Vy_max-Vy_min); 
+   glutInitWindowPosition (100, 100);
+   glutCreateWindow (argv[0]);
+   
+   init ();
+
+   glutDisplayFunc(display); 
+   glutReshapeFunc(reshape);
+   glutMouseFunc(mouse);
+   glutMainLoop();
+   return EXIT_SUCCESS;
+}