世弦 week06

一、打光:

1. 打開上次的week05，並加上以下幾行 在程式中:

GLfloat pos[]={0.0, 0.0, -1.0, 0.0}; //偷來的打光(3)
glEnable(GL_DEPTH_TEST); //偷來的3D深度測試，打開Enable
glEnable(GL_LIGHTING); //偷來的打光(2)，打開Enable
glEnable(GL_LIGHT0); //偷來的打光(1)，打開Enable
glLightfv(GL_LIGHT0, GL_POSITION, pos);




2.並執行:





二、寫回家作業(keyboard、Mouse、轉動、移動):

1.加入keyboard、Mouse 函式讓他可以印滑鼠所在座標:

void keyboard(unsigned char key, int x, int y)
{
    printf("now %c (%d,%d)\n", key, x, y);
}
void mouse(int button, int state, int x, int y)
{

}

int main(...)
{
   .
   .
   .
   glutDisplayFunc(display);
   glutKeyboardFunc(keyboard);
   glutMouseFunc(mouse);

}

2. 並且執行，滑鼠一直在畫面移動，並按鍵盤:



3.鍵盤讓他轉動:

int rotateX, rotateY, rotateZ; //旋轉軸
void keyboard(unsigned char key, int x, int y)
{
    printf("now %c (%d,%d)\n", key, x, y);
    if(key=='1')rotateX++; //控制旋轉方向
    else if(key=='2')rotateY++;
    else if(key=='3')rotateZ++;
    glutPostRedisplay(); //把畫面重新re-display
}

void display()
{
    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
    glPushMatrix();
       glRotatef(rotateX, 1, 0, 0);
       glRotatef(rotateY, 0, 1, 0);
       glRotatef(rotateZ, 0, 0, 1);
       drawmodel();
    glPopMatrix();

    glutSwapBuffers();
}



4.滑鼠讓他轉動:

int OldX=0, OldY=0; //舊座標
void mouse(int button, int state, int x, int y)
{
    printf("button: %d  state: %d (%d %d)\n", button, state, x, y);
    if(state==GLUT_DOWN) //點下滑鼠
    {
        OldX=x, OldY=y; //
    }
}
void motion(int x, int y)
{
    rotateX+=-(y-OldY); //X方向轉動
    rotateY+=-(x-OldX); //Y 方向轉動
    OldX=x, OldY=y; //更新座標
    glutPostRedisplay();
}

glutMouseFunc(mouse);
glutMotionFunc(motion);