Comp. Grahics 3

#include <windows.h> #include <gl/Gl.h> #include <gl/glut.h> struct GLintPoint{ GLfloat x,y; }; GLintPoint P; int screenheight = 600; int screenwidth = 800; void myMouse(int button, int state, int x, int y) { if(state == GLUT_DOWN) { if(button == GLUT_LEFT_BUTTON) { P.x=x; P.y=screenheight-y; glutPostRedisplay(); } else if (button == GLUT_RIGHT_BUTTON) { glClearColor(1.0f, 0.0f, 0.0f, 0.0f); // Red glClear(GL_COLOR_BUFFER_BIT); glFlush(); } } } void myDisplay() { glClearColor(0.3f, 1.0f, 0.7f, 0.0f); //teal glClear(GL_COLOR_BUFFER_BIT); glPointSize(5.0); glBegin(GL_POINTS);{ //glVertex2i(screenwidth - x, y); //glVertex2i(x, y); glVertex2i(P.x, P.y); } glEnd(); glFlush(); } int main( int argc, char ** argv ) { glutInit( &argc, argv ); glutInitWindowPosition( 0, 0 ); glutInitWindowSize( 800, 600 ); //glutInitDisplayMode( GLUT_RGB | GLUT_DOUBLE ); P.x=100; P.y=100; // create window glutCreateWindow( "Draw Dots" ); // set the view frustum glMatrixMode( GL_PROJECTION ); glLoadIdentity(); gluOrtho2D( 0, 800, 0, 600 ); //glMatrixMode( GL_MODELVIEW ); // clear rendering surface //glClearColor(0.0f, 0.0f, 0.0f, 0.0f); // background is black glViewport(0, 0, 800, 600); glutMouseFunc( myMouse ); glutDisplayFunc( myDisplay ); glutMainLoop(); }