week08

[做一個以正中心為原點旋轉的長方形]

--------程式碼--------------------------------------------------------------------------------------------------------
#include <Gl/glut.h>
void upper_arm()
{
glPushMatrix();
glScalef(1,0.3,0.3);
glutSolidCube(0.5);
glPopMatrix();
}
float angle=0;
void display()
{
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glPushMatrix();
glRotatef(angle,0,0,1);
upper_arm();
glPopMatrix();
angle++;
glutSwapBuffers();
}
int main(int argc, char**argv)
{
glutInit(&argc,argv);
glutInitDisplayMode(GLUT_DOUBLE | GLUT_DEPTH);
glutCreateWindow("week08");
glutIdleFunc(display);
glutDisplayFunc(display);
glutMainLoop();
}

選某短邊為中心旋轉

-----程式碼------------------------------------------------------------------------------------------------
在display下加上兩行
glRotatef(angle,0,0,1);
glTranslatef(0.25,0,0);