1. CSC 307 1.0 Graphics Programming
Budditha Hettige
Department of Statistics and Computer Science

2. Graphics Programming Viewing07
Graphics Programming Viewing

3. Translate
void glTranslate{fd}(TYPE x, TYPE y, TYPE z);

4. Rotate
void glRotate{fd}(TYPE angle, TYPE x, TYPE y, TYPE z); glRotatef(45.0, 0.0, 0.0, 1.0) - rotation of 45 degrees about the z-axis

5. Scale
void glScale{fd}(TYPE x, TYPE y, TYPE z); Example: glScalef(2.0, –0.5, 1.0)

6. Viewing and Modeling Transformations
Rotating First or Translating First

7. Viewpoint
Object and Viewpoint at the Origin

8. Viewpoint and the Object
Separating the Viewpoint and the Object
glTranslatef(0.0, 0.0, -5.0);

9. Using the gluLookAt() void gluLookAt (
GLdouble eyex, GLdouble eyey, GLdouble eyez,
GLdouble centerx, GLdouble centery, GLdouble centerz,
GLdouble upx, GLdouble upy, GLdouble upz );

10. Default Camera Position
gluLookAt(0.0, 0.0, 0.0, 0.0, 0.0, , 0.0, 1.0, 0.0);

11. Using gluLookAt()
gluLookAt(4.0, 2.0, 1.0, 2.0, 4.0, -3.0, 2.0, 2.0, -1.0);

12. Projection Transformations
Perspective Projection
void glFrustum(GLdouble left, GLdouble right,
GLdouble bottom, GLdouble top,
GLdouble near, GLdouble far);

13. Orthographic Projection
void glOrtho(GLdouble left, GLdouble right, GLdouble bottom, GLdouble top, GLdouble near, GLdouble far);

14. Viewport Transformation
Defining the Viewport
void glViewport(GLint x, GLint y, GLsizei width, GLsizei height);

15. The Transformed Depth Coordinate
void glDepthRange(GLclampd near, GLclampd far);

16. Animation Is an important part of computer graphics
Taking a sequence of pictures and projecting them at 24 frames per second on the screen
void glutSwapBuffers(void);

17. Example # include <windows.h> #include <GL/glut.h>
void display(void) {
glClear(GL_COLOR_BUFFER_BIT);
glPushMatrix();
glRotatef(spin, 0.0, 0.0, 1.0);
glColor3f(1.0, 1.0, 1.0);
glRectf(-25.0, -25.0, 25.0, 25.0);
glPopMatrix();
glutSwapBuffers();
spinDisplay(); }
void reshape(int w, int h)
glViewport(0, 0, (GLsizei) w, (GLsizei) h);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
glOrtho(-50.0, 50.0, -50.0, 50.0, -1.0, 1.0);
glMatrixMode(GL_MODELVIEW);
# include <windows.h>
#include <GL/glut.h>
#include <stdlib.h>
static GLfloat spin = 0.0;
void spinDisplay(void) {
spin = spin ;
if (spin > 360.0)
spin = spin ;
glutPostRedisplay(); }

18. Example
int main(int argc, char** argv) { glutInit(&argc, argv); glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGB); glutInitWindowSize(250, 250); glutInitWindowPosition(100, 100); glutCreateWindow(argv[0]); glClearColor(0.0, 0.0, 0.0, 0.0); glShadeModel(GL_FLAT); glutDisplayFunc(display); glutReshapeFunc(reshape); glutMainLoop(); return 0; }

19. Building a Solar System
planet example (planet.cpp)

20. Building an Articulated Robot Arm
robotArm.cpp