旋轉角度01160581

#include<GL/glut.h>
#include<stdio.h>
float angleX=0,startX=0;
void keyboard(unsigned char key, int x, int y)
{
printf("%c %d %d\n",key,x,y);//KEY鍵 滑鼠的x,y座標 
if(key=='a') angleX+=3;
if(key=='b') angleX-=3;
glutPostRedisplay();//改變角度後，重新re-display    
}
void mouse(int button, int state, int x, int y)
{
printf("%d %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;
//angleY= y - startY;這兩行如果滑鼠放掉又會變成圓點開始。
angleX += x - startX; startX=x;
angleY += y - startY; startY=y;//這樣才可以累加
glutPostRedisplay();
}
void display()
{
glEnable(GL_DEPTH_TEST);//多加一行深度測試，不然水壺會變透明的 
 glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT); glPushMatrix(); float dist = sqrt (angleX*angleX + angleY*angleY);//運算距離 glRotatef(dist, -angleY, -angleX, 0); glMultMatrixf(m); glGetFloatv(GL_MODELVIEW_MATRIX,m); glutSolidTeapot(0.3); glPopMatrix(); glutSwapBuffers();
}
void myLight()
{
const GLfloat light_position[] = { 2.0f, 5.0f, -5.0f, 0.0f };//用專案複製就好
glEnable(GL_LIGHT0);
    glEnable(GL_NORMALIZE);
    glEnable(GL_COLOR_MATERIAL);
    glEnable(GL_LIGHTING);
    glLightfv(GL_LIGHT0, GL_POSITION, light_position);
}

int main()
{
glutInitDisplayMode(GLUT_DOUBLE | GLUT_DEPTH);
glutInitWindowSize(600,600);//修改視窗大小 
glutCreateWindow("week10");

glutDisplayFunc(display);
//glutKeyboardFunc(keyboard);
glutMouseFunc(mouse);
glutMotionFunc(motion);
myLight();
glutMainLoop();
}