Download OU BE (B-Tech) CSE Mini Projects Code Programs on Logical operations in GLUT

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#include<windows.h>
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#include<GL/glut.h>
float xm,ym,xmm,ymm;
void display()
{
}
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/* Program to draw erasable rectangle */
{
glClearColor(1.0,1.0,1.0,1.0);
glClear(GL_COLOR_BUFFER_BIT);
glEnable(GL_COLOR_LOGIC_OP);
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void myMouse(int btn, int state, int x, int y)
{
if(btn==GLUT_LEFT_BUTTON && state==GLUT_DOWN)
{
xm=x;
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ym=(500-y);
glColor3f(0.0,0.0,1.0);
glLogicOp(GL_XOR);
}
if(btn==GLUT_LEFT_BUTTON && state==GLUT_UP)
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{
xmm=x;
ymm=(500-y);
glLogicOp(GL_XOR);
glRectf(xm,ym,xmm,ymm);
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glFlush();
}
}
void reshape(GLsizei w, GLsizei h)
{
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}
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
gluOrtho2D(0,500,0,500);
glMatrixMode(GL_MODELVIEW);
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int main(int argc, char **argv)
{
glutInit(&argc, argv);
glutInitDisplayMode(GLUT_SINGLE|GLUT_DEPTH|GLUT_RGB);
glutInitWindowSize(500,500);
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glutInitWindowPosition(100,100);
glutCreateWindow("erasable lines");
glutDisplayFunc(display);
glutReshapeFunc(reshape);
glutMouseFunc(myMouse);
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glutMainLoop();
} 

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