C++:GLUT

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Links for tutorial One SET09115

OpenGL is an API to drive graphics cards. The glut library provides a convenient interface to the OpenGL commands. Links for the Week 5 Tutorial

Sadly you cannot compile GLUT programs from ProgZoo at present. However you can copy and paste the examples into your own development environment.

This example shows a green triangle in front of a red square:

Create a project (using visual studio or otherwise) and copy in this code.

Change the code so that the triangle is a Right angled triangle with side length 1.0

the triangle colour should be Napier red with glColor3ub(189,41,50)
the triangle should be rotated at a jaunty 30° angle.
the square behind should be a corporate gray glColor3ub(128,128,128)

Hint

#include <GL/glut.h>
#include <math.h>
void drawFigure(void)
{
  glColor3ub(255,0,0);
  glBegin(GL_QUADS);
  glVertex3f( 1.0, 1.0,-1.0);
  glVertex3f(-1.0, 1.0,-1.0);
  glVertex3f(-1.0,-1.0,-1.0);
  glVertex3f( 1.0,-1.0,-1.0);
  glEnd();

glColor3ub(0,255,0);
  glBegin(GL_TRIANGLES);
  glVertex3f( 0.0, 1.0,0.0);
  glVertex3f( 1.0,-1.0,0.0);
  glVertex3f(-1.0,-1.0,0.0);
  glEnd();
}

void
display(void)
{
  glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
  drawFigure();
  glutSwapBuffers();
}

void
init(void)
{
  glEnable(GL_DEPTH_TEST);
  glMatrixMode(GL_PROJECTION);
  gluPerspective(  40, /* field of view in degree */
		  1.0, /* aspect ratio */
		  1.0, /* Z near */ 
		 10.0  /* Z far */);
  glMatrixMode(GL_MODELVIEW);
  gluLookAt(0.0, 0.0, 5.0,  /* eye */
	    0.0, 0.0, 0.0,  /* center */
	    0.0, 1.0, 0.0)  /* up */; 
}

int
main(int argc, char **argv)
{
  glutInit(&argc, argv);
  glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGB | GLUT_DEPTH);
  glutCreateWindow("Triangle");
  glClearColor(1,1,1,0);
  glutDisplayFunc(display);
  glutIdleFunc(display);
  init();
  glutMainLoop();
  return 0;
}

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C++:GLUT

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