linetask1.c

图形学课件 图形学课件 图形学课件

/*  lineTask1.c    */
/* illustrates rubberband line drawing */


#include <GL/glut.h>

/* attention 1-3
/* attention 1  Please add your global variables here! */
	/* ...*/



void init()
{

	glMatrixMode(GL_PROJECTION);
	glLoadIdentity();
	gluOrtho2D (0.0,  1.0, 0.0,  1.0);
	glMatrixMode(GL_MODELVIEW);
	glLoadIdentity();

/* attention 2  Please finish initialization here! */
/* 1. to set the background color */
/* 2. to enable color logic operation */
/* 3. to set the mode to COPY mode*/
	/* ...*/

}


void display()
{
	glClear(GL_COLOR_BUFFER_BIT);
	glColor3f(1.0, 0.0, 0.0);
	glRectf(0.25, 0.25, 0.75, 0.75);

	glLogicOp(GL_XOR);
	glColor3f(1.0, 1.0, 0.0);
	glFlush();
}



void mouse(int btn, int state, int x, int y)
{
	/* attention 3 Please add your code here! */
	/* ...*/

}



int main(int argc, char** argv)
{
	glutInit(&argc,argv); 
	glutInitDisplayMode (GLUT_SINGLE | GLUT_RGB);
	glutInitWindowSize(500,500);
	glutInitWindowPosition(0,0); 
	glutCreateWindow("rubberband");
	glutDisplayFunc(display);
	glutMouseFunc(mouse);
	init();
	glutMainLoop();
}