Comp. Grahics 3

#include<windows.h> #include<gl/glut.h> #define RED 1 #define GREEN 2 #define BLUE 3 #define WHITE 4 float angle = 0.0; float red=1.0, blue=1.0, green=1.0; void renderScene(void) { glClearColor(0.0,0.0,0.0,0.0); glClear(GL_COLOR_BUFFER_BIT); glColor3f(red,green,blue); glBegin(GL_TRIANGLES); glVertex3f(-0.5,-0.5,0.0); glVertex3f(0.5,0.0,0.0); glVertex3f(0.0,0.5,0.0); glEnd(); glFlush(); } void processMenuEvents(int option) { switch (option) { case RED : red = 1.0; green = 0.0; blue = 0.0; break; case GREEN : red = 0.0; green = 1.0; blue = 0.0; break; case BLUE : red = 0.0; green = 0.0; blue = 1.0; break; case WHITE : red = 1.0; green = 1.0; blue = 1.0; break; } glutPostRedisplay(); } int main(int argc, char **argv) { glutInit(&argc, argv); glutInitDisplayMode(GLUT_SINGLE | GLUT_RGB); glutInitWindowPosition(100,100); glutInitWindowSize(320,320); glutCreateWindow("Menu Test"); glutDisplayFunc(renderScene); //glutIdleFunc(renderScene); //call our function to create the menu glutCreateMenu(processMenuEvents); glutAddMenuEntry("Red",RED); glutAddMenuEntry("Blue",BLUE); glutAddMenuEntry("Green",GREEN); glutAddMenuEntry("White",WHITE); glutAttachMenu(GLUT_RIGHT_BUTTON); glutMainLoop(); }