wk6

一開始我們先複習上禮拜的打光

讓茶壺可以移動

#include <GL/glut.h>

const GLfloat light_ambient[]  = { 0.0f, 0.0f, 0.0f, 1.0f };

const GLfloat light_diffuse[]  = { 1.0f, 1.0f, 1.0f, 1.0f };

const GLfloat light_specular[] = { 1.0f, 1.0f, 1.0f, 1.0f };

const GLfloat light_position[] = { 2.0f, 5.0f, -5.0f, 0.0f };

const GLfloat mat_ambient[]    = { 0.7f, 0.7f, 0.7f, 1.0f };

const GLfloat mat_diffuse[]    = { 0.8f, 0.8f, 0.8f, 1.0f };

const GLfloat mat_specular[]   = { 1.0f, 1.0f, 1.0f, 1.0f };

const GLfloat high_shininess[] = { 100.0f };

float teapotX=0, teapotY=0;

int oldX=0,oldY=0;

void mouse(int button,int state, int x, int y){

    ///要讓滑鼠可以移動茶壺 第一步: 按下去

    oldX=x;

    oldY=y;

}

void motion(int x, int y){///第二步: motion 動

    teapotX += x-oldX;

    teapotY += y-oldY;

    oldX=x;

    oldY=y;

    glutPostRedisplay();///更新畫面

}

void display(){

    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

    glPushMatrix();

        glTranslatef( teapotX/250.0,-teapotY/250.0,0);

        glutSolidTeapot(0.3);

    glPopMatrix();

    glutSwapBuffers();

}

int main(int argc, char *argv[])

{

    glutInit(&argc, argv);

    glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH);

    glutCreateWindow("GLUT Shapes");

    glutDisplayFunc(display);

    glutMouseFunc(mouse);

    glutMotionFunc(motion);

    glEnable(GL_DEPTH_TEST);

    glDepthFunc(GL_LESS);

    glEnable(GL_LIGHT0);

    glEnable(GL_NORMALIZE);

    glEnable(GL_COLOR_MATERIAL);

    glEnable(GL_LIGHTING);

    glLightfv(GL_LIGHT0, GL_AMBIENT,  light_ambient);

    glLightfv(GL_LIGHT0, GL_DIFFUSE,  light_diffuse);

    glLightfv(GL_LIGHT0, GL_SPECULAR, light_specular);

    glLightfv(GL_LIGHT0, GL_POSITION, light_position);

    glMaterialfv(GL_FRONT, GL_AMBIENT,   mat_ambient);

    glMaterialfv(GL_FRONT, GL_DIFFUSE,   mat_diffuse);

    glMaterialfv(GL_FRONT, GL_SPECULAR,  mat_specular);

    glMaterialfv(GL_FRONT, GL_SHININESS, high_shininess);

    glutMainLoop();

    return EXIT_SUCCESS;

}

讓茶壺可以移動並且旋轉

float teapotX=0, teapotY=0;

int oldX=0,oldY=0;

float teapotRotY=0;

int type=1;///1=Rotate 旋轉, 2=Translate 移動

void mouse(int button,int state, int x, int y){

    oldX=x;

    oldY=y;

}

void motion(int x, int y){

    if (type==1){///轉動 Rotate

        teapotRotY += x-oldX;///轉動的變數

    }else if(type==2){///移動 Translate

        teapotX += x-oldX;

        teapotY += y-oldY;

    }

    oldX=x;

    oldY=y;

    glutPostRedisplay();

}

void display(){

    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

    glPushMatrix();

        glTranslatef( teapotX/150.0,-teapotY/150.0,0);

        glRotatef(teapotRotY,0,-1,0);///x方向的動 vs. Y軸

        glutSolidTeapot(0.3);

    glPopMatrix();

    glutSwapBuffers();

}

void keybord(unsigned char key,int x,int y)///按E旋轉茶壺，按W移動茶壺

{

    if (key=='e' || key=='E') type=1;

    if (key=='w' || key=='W') type=2;

}

    glutKeyboardFunc(keybaord);///keyboard

讓茶壺在閒置的時候旋轉

void display(){

    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

    glPushMatrix();

        glTranslatef( teapotX/150.0,-teapotY/150.0,0);

        glRotatef(teapotRotY,0,-1,0);///x方向的動 vs. Y軸

        glutSolidTeapot(0.3);

    glPopMatrix();

    glutSwapBuffers();

    teapotRotY++;///每次多轉1次

}

    glutIdleFunc(display);///Idle=閒置

解釋旋轉和移動

1. 一台車子 

2.改變車子的大小

3."旋轉"改變大小的車子

4."移動"已經改變大小並且"旋轉"過的車子

1. 一台車子 

2.改變車子的大小

3."移動"改變大小的車子

4."旋轉"已經改變大小並且"移動"過的車子