week 03 找飯店?trivago

week03

開起茶壺

點出座標

拖曳滑鼠變顏色

#include <math.h>
#include <stdio.h>
#include <GL/glut.h>
//#include <GLUT/glut.h>//Apple
void mouse(int button, int state,int x,int y)
{
    ///This is mouse function
    if(state=GLUT_DOWN) printf("glVertex2f( %.2f, %.2f);\n",(x-250)/250.0, -(y-250)/250.0);
}
void motion (int x, int y)
{


    glColor3f( 1,x/500.0, y/500.0);///500 for window size
    glutPostRedisplay(); ///display(); ///wrong!!!
}
void display()

{
    glBegin(GL_POLYGON);
    for(float angle=0;angle<3.14159*2;angle+=0.001)
    {
        glVertex2f(cos(angle),sin(angle));
        glEnd();
        glutSwapBuffers();
    }

}


 int main(int argc,char*argv[])
{
    glutInit( &argc, argv);
    glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH);
    glutInitWindowSize(500,500);
    glutCreateWindow("04160551 Number 1");

    glutDisplayFunc(display);
    glutMouseFunc(mouse);///test the mouse func
    glutMotionFunc(motion);
    glutMainLoop();

}