轉動的茶壺

程式碼：

#include<GL/glut.h>
float angleX=0;    //轉動角度變數
void keyboard(unsigned char key, int x, int y)   //鍵盤控制
{
if(key=='a') angleX+=3;
if(key=='b') angleX-=3;
glutPostRedisplay();
}
void display()
{
glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);
glPushMatrix();
glRotatef(angleX, 0, 1, 0);
glutSolidTeapot(0.3);
glPopMatrix();
glutSwapBuffers();
}
int main()
{
glutInitDisplayMode(GLUT_DOUBLE|GLUT_DEPTH);
glutCreateWindow("week10");
glutDisplayFunc(display);
glutKeyboardFunc(keyboard);
glutMainLoop();
}

新增：開黑色視窗
#include<stdio.h>
void keyboard(unsigned char key, int x, int y)
{
printf("%c %d %d\n",key,x,y);
if(key=='a') angleX+=3;
if(key=='b') angleX-=3;
glutPostRedisplay();
}

新增：打光
void myLight()  
{
const GLfloat light_position[] = { 2.0f, 5.0f, -5.0f, 0.0f };
glEnable(GL_LIGHT0);
    glEnable(GL_NORMALIZE);
    glEnable(GL_COLOR_MATERIAL);
    glEnable(GL_LIGHTING);
    glLightfv(GL_LIGHT0, GL_POSITION, light_position);
}
void display()
{
glEnable(GL_DEPTH_TEST);
glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);
glPushMatrix();
glRotatef(angleX, 0, 1, 0);
glutSolidTeapot(0.3);
glPopMatrix();
glutSwapBuffers();
}
int main()
{
glutInitDisplayMode(GLUT_DOUBLE|GLUT_DEPTH);
glutCreateWindow("week10");
glutDisplayFunc(display);
glutKeyboardFunc(keyboard);
myLight();
glutMainLoop();
}

新增：滑鼠控制 x軸左右
float angleX=0,startX=0;
void mouse(int button, int state, int x, int y)
{
printf("%d %d %d\n", button, state, x, y);
startX=x;
}
void motion(int x, int y)
{
printf("%d %d\n",x, y);
angleX=x-startX;
glutPostRedisplay();
}
void display()
{
glEnable(GL_DEPTH_TEST);
glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);
glPushMatrix();
glRotatef(angleX, 0, -1, 0);
glutSolidTeapot(0.3);
glPopMatrix();
glutSwapBuffers();

}
int main()
{
glutInitDisplayMode(GLUT_DOUBLE|GLUT_DEPTH);
glutCreateWindow("week10");
glutDisplayFunc(display);
glutKeyboardFunc(keyboard);
myLight();
glutMouseFunc(mouse);
glutMotionFunc(motion);
glutMainLoop();
}

新增：y軸旋轉
float angleY=0,startY=0;
void mouse(int button, int state, int x, int y)
{
printf("%d %d %d\n", button, state, x, y);
startX=x;
startY=y;
}
void motion(int x, int y)
{
printf("%d %d\n",x, y);
angleX+=x-startX; startX=x;
angleY+=y-startY; startY=y;
glutPostRedisplay();
}
void display()
{
glEnable(GL_DEPTH_TEST);
glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);
glPushMatrix();
glRotatef(angleX, 0, -1, 0);
glRotatef(angleY, -1, 0, 0);
glutSolidTeapot(0.3);
glPopMatrix();
glutSwapBuffers();
}

新增：轉動
#include<math.h>
float m[16]={1,0,0,0, 0,1,0,0, 0,0,1,0, 0,0,0,1};
void motion(int x, int y)
{
printf("%d %d\n",x, y);
angleX=x-startX; startX=x;
angleY=y-startY; startY=y;
glutPostRedisplay();
}
void display()
{
glEnable(GL_DEPTH_TEST);
glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);
glPushMatrix();
float dist=sqrt(angleX*angleX+angleY*angleY);
glRotatef(dist,-angleY,-angleX,0);
glMultMatrixf(m);
glGetFloatv(GL_MODELVIEW_MATRIX,m);
glutSolidTeapot(0.3);
glPopMatrix();
glutSwapBuffers();
}


最後程式碼：
#include<GL/glut.h>
#include<stdio.h>
#include<math.h>
float angleX=0,startX=0;
float angleY=0,startY=0;
float m[16]={1,0,0,0, 0,1,0,0, 0,0,1,0, 0,0,0,1};
void mouse(int button, int state, int x, int y)
{
printf("%d %d %d\n", button, state, x, y);
startX=x;
startY=y;
}
void motion(int x, int y)
{
printf("%d %d\n",x, y);
angleX=x-startX; startX=x;
angleY=y-startY; startY=y;
glutPostRedisplay();
}
void keyboard(unsigned char key, int x, int y)
{
printf("%c %d %d\n",key,x,y);
if(key=='a') angleX+=3;
if(key=='b') angleX-=3;
glutPostRedisplay();
}
void myLight()
{
const GLfloat light_position[] = { 2.0f, 5.0f, -5.0f, 0.0f };
glEnable(GL_LIGHT0);
    glEnable(GL_NORMALIZE);
    glEnable(GL_COLOR_MATERIAL);
    glEnable(GL_LIGHTING);
    glLightfv(GL_LIGHT0, GL_POSITION, light_position);
}
void display()
{
glEnable(GL_DEPTH_TEST);
glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);
glPushMatrix();
float dist=sqrt(angleX*angleX+angleY*angleY);
glRotatef(dist,-angleY,-angleX,0);
glMultMatrixf(m);
glGetFloatv(GL_MODELVIEW_MATRIX,m);
glutSolidTeapot(0.3);
glPopMatrix();
glutSwapBuffers();
}
int main()
{
glutInitDisplayMode(GLUT_DOUBLE|GLUT_DEPTH);
glutCreateWindow("week10");
glutDisplayFunc(display);
glutKeyboardFunc(keyboard);
myLight();
glutMouseFunc(mouse);
glutMotionFunc(motion);
glutMainLoop();
}