羅浩倫的學習筆記 Week06

本週學習重點

1.複習上週進度

2.編譯上週Transformation程式(小心compiler設定 v.s. strdup() )

3.作業2 : Keyboard, Mouse, 轉動, 移動

4.主軸: 打光 Lighting

上課紀錄:

1.首先把Setting-Compiler設定的C++11選項取消掉 (和strdup() 衝突)

2.接著到老師網頁下來的source code的projection.c找和 light 相關的程式碼，複製貼上到上禮拜未完成的專案

 總共有以下5行

GLfloat light_pos[] = { 0.0, 0.0, 1.0, 0.0 };

glEnable(GL_DEPTH_TEST); /// 此行是為了讓光線有錢後深淺的效果，否則會糊成一團

glEnable(GL_LIGHT0);

glEnable(GL_LIGHTING);

glLightfv(GL_LIGHT0, GL_POSITION, light_pos);

3.其中因為因為我們的程式相機的位置不一樣，要把GLfloat light_pos[] = { 0.0, 0.0, 1.0, 0.0 };改成

GLfloat light_pos[] = { 0.0, 0.0, -1.0, 0.0 };

然後試著執行看看

4.接下來試著練習看看作業的內容(keyboard和mouse等等函式)

GLfloat light_pos[] = { 0.0, 0.0, -1.0, 0.0 };
int oldX, oldY;
int rotateX=0, rotateY=0, rotateZ=0;
double scale = 1.0;

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);
        glScalef(scale, scale, scale);
        drawmodel();
    glPopMatrix();
    glutSwapBuffers();
}

void keyboard(unsigned char key, int x, int y){
    static int d = 1, direction = 1;
    if (key == 'q'){
        direction = (direction== 1?-1:1);
        printf("change direction: %d\n", direction);
    }

    if (key == '1')
        rotateX += d*direction;
    else if (key == '2')
        rotateY += d*direction;
    else if (key == '3')
        rotateZ += d*direction;

    if (key == '+' && d<10){
        d++;
    }
    else if (key == '-' && d>1){
        d--;
    }
}

void mouse(int botton, int state, int x, int y){
    if (botton == GLUT_LEFT_BUTTON){
        if (state == GLUT_DOWN){
            oldX = x;
            oldY = y;
        }
    }
    else if (botton == 3 && scale > 0){
        scale -= 0.05;
    }
    else if (botton == 4 && scale < 3){
        scale += 0.05;
    }
    printf("%d", botton);
}

void motion(int x, int y){
    rotateX += (oldY-y);
    rotateY += (oldX-x);
    oldX = x;
    oldY = y;
}

void idle(){
    glutPostRedisplay();
}

記得要在main函式裡面註冊這些函式
glutKeyboardFunc(keyboard);
glutMouseFunc(mouse);
glutMotionFunc(motion);
glutIdleFunc(idle);