Viewing
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This document discusses graphics programming and concepts such as viewing, transformations, projection, animation, and examples. It covers translation, rotation, and scaling transformations, as well as viewing transformations like gluLookAt. It also discusses projection transformations including perspective and orthographic projection. Finally, it provides examples of animating a spinning rectangle and building a solar system and robot arm.
![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;
}
18Budditha Hettige](https://image.slidesharecdn.com/vew-170814145157/85/Viewing-18-320.jpg)
Viewing
- 1. CSC 307 1.0 Graphics Programming Budditha Hettige Department of Statistics and Computer Science
- 3. Translate • void glTranslate{fd}(TYPE x, TYPE y, TYPE z); 3Budditha Hettige
- 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 4Budditha Hettige
- 5. Scale void glScale{fd}(TYPE x, TYPE y, TYPE z); Example: glScalef(2.0, –0.5, 1.0) 5Budditha Hettige
- 6. Viewing and Modeling Transformations • Rotating First or Translating First 6Budditha Hettige
- 7. Viewpoint • Object and Viewpoint at the Origin 7Budditha Hettige
- 8. Viewpoint and the Object • Separating the Viewpoint and the Object • glTranslatef(0.0, 0.0, -5.0); 8Budditha Hettige
- 9. Using the gluLookAt() void gluLookAt ( GLdouble eyex, GLdouble eyey, GLdouble eyez, GLdouble centerx, GLdouble centery, GLdouble centerz, GLdouble upx, GLdouble upy, GLdouble upz ); 9Budditha Hettige
- 10. Default Camera Position 10 gluLookAt(0.0, 0.0, 0.0, 0.0, 0.0, -100.0, 0.0, 1.0, 0.0); Budditha Hettige
- 11. Using gluLookAt() gluLookAt(4.0, 2.0, 1.0, 2.0, 4.0, -3.0, 2.0, 2.0, -1.0); 11Budditha Hettige
- 12. Projection Transformations • Perspective Projection void glFrustum(GLdouble left, GLdouble right, GLdouble bottom, GLdouble top, GLdouble near, GLdouble far); 12Budditha Hettige
- 13. Orthographic Projection void glOrtho(GLdouble left, GLdouble right, GLdouble bottom, GLdouble top, GLdouble near, GLdouble far); 13Budditha Hettige
- 14. Viewport Transformation • Defining the Viewport • void glViewport(GLint x, GLint y, GLsizei width, GLsizei height); 14Budditha Hettige
- 15. The Transformed Depth Coordinate • void glDepthRange(GLclampd near, GLclampd far); 15Budditha Hettige
- 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); 16Budditha Hettige
- 17. Example # include <windows.h> #include <GL/glut.h> #include <stdlib.h> static GLfloat spin = 0.0; void spinDisplay(void) { spin = spin + 0.05; if (spin > 360.0) spin = spin - 360.0; glutPostRedisplay(); } 17 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); glLoadIdentity(); }Budditha Hettige
- 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; } 18Budditha Hettige
- 19. Building a Solar System • planet example (planet.cpp) 19Budditha Hettige
- 20. Building an Articulated Robot Arm • robotArm.cpp 20Budditha Hettige