A

WEEK06

https://jsyeh.org/3dcg10/下載 data win32

windows.zip => 下載 \windows\Light Material.exe

(左上)右鍵，換模型

(左下)右鍵，換Meterial

(左下)右鍵，換模型
 

實作

freeglut裝好，改lib

Ctrl-F找 light

偷程式碼

#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};

void display()

{

    glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);

    glColor3f(1,1,0);

    glutSolidTeapot(0.3);

    glutSwapBuffers();

}

int main(int argc,char** argv)

{

    glutInit(&argc,argv);

    glutInitDisplayMode(GLUT_DOUBLE|GLUT_DEPTH);

    glutCreateWindow("week06 light");

    glutDisplayFunc(display);

    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();

}

了解打光的作法

#include <GL/glut.h>

#include <stdio.h>

float x=150,y=150,z=0,scale=1.0,angle=0.0;

    ///使茶壺在正中央

int oldX=0,oldY=0,now=1;///預設為移動

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 };

void display()

{

    glClearColor(0.5,0.5,0.5,1);///R G B A(為半透明，目前沒開)

    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

    glPushMatrix();///備分矩陣

        glTranslatef((x-150)/150.0,-(y-150)/150.0,z);

        glRotatef(angle,0,1,0);///對y軸轉動

        glScalef(scale,scale,scale);///都縮放成scale倍

        glColor3f(1,1,0);

        glutSolidTeapot(0.3);

    glPopMatrix();///還原矩陣

    glutSwapBuffers();

}

void keyboard(unsigned char key,int mousex,int mousey)

{

    if(key=='1' || key=='w' || key=='W')now=1;///移動

    if(key=='2' || key=='e' || key=='E')now=2;///轉動

    if(key=='3' || key=='r' || key=='R')now=3;///縮放

}

void mouse(int botton,int state,int mousex,int mousey)

{

    oldX=mousex; oldY=mousey;

}

void motion(int mousex,int mousey)///用滑鼠移動茶壺

{

    if(now==1){///移動

        x+=(mousex-oldX); y+=(mousey-oldY);

    }

    else if(now==2){///轉動

        angle+=(mousex-oldX);///轉動

    }

    else if(now==3){///縮放

        if((mousex-oldX)>0)scale*=1.01;

        if((mousex-oldX)<0)scale*=0.99;

    }

    oldX=mousex; oldY=mousey;

    display();

}

int main(int argc, char**argv)

{

    glutInit(&argc, argv);

    glutInitDisplayMode(GLUT_DOUBLE | GLUT_DEPTH);

    glutCreateWindow("week06-light");

    glutDisplayFunc(display);

    glutMouseFunc(mouse);

    glutMotionFunc(motion);

    glutKeyboardFunc(keyboard);

    ///偷來的程式要放在glutCreateWindow 之後，才會有效

    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);

    ///放在glutMainLoop之前

    glutMainLoop();///卡在這裡，之後的程式，都不會執行到

}

整合打光+上周交的

圖學筆記week06

 開啟glut專案

不用像往常一樣刪掉，按ctrl+F，搜尋light

就會跳出以下結果

把程式碼成下列:

///#include <GL/glut.h>

const GLfloat light_ambient[]  = { 0.0f, 0.0f, 0.0f, 1.0f };///這之前的程式都刪掉

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 };

void display()

{

    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

        glColor3f(1,1,0);

        glutSolidTeapot(0.3);

    glutSwapBuffers();

}

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

{

    glutInit(&argc, argv);

    glutInitDisplayMode(GLUT_DOUBLE | GLUT_DEPTH);

    glutCreateWindow("week06 light");

    glutDisplayFunc(display);

    ///引用來的程式，要放glutCreateWindow之後，才會有效

    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);

///放glutMainloop()之前

    glutMainLoop();///卡在這裡，之前的程式都不會執行到

}

///

變成下列結果

把上週keyboard_mouse_motion拿出來

///

#include <GL/glut.h>

#include <stdio.h>

float x=150, y=150, z=0, scale=1.0;

int oldX=0, oldY=0;

void display()

{

    glClearColor(0.5, 0.5, 0.5, 1);///R, G, B, A其中A半透明功能,目前沒開

    glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);

    glPushMatrix();///備份矩陣

        glTranslatef( (x-150)/150.0 , -(y-150)/150.0, z);

        glScalef(scale, scale, scale);

        glColor3f(1,1,0);

        glutSolidTeapot(0.3);

    glPopMatrix();///還原矩陣

    glutSwapBuffers();

}

void keyboard(unsigned char key, int mouseX, int mouseY)

{

}

void mouse(int button, int state, int mouseX, int mouseY)

{///為了修飾瞬間移動的錯誤，改加了這條程式碼

    oldX =mouseX; oldY =mouseY;

}

void motion(int mouseX, int mouseY)

{

    if(mouseX - oldX > 0) scale *=1.01;

    if(mouseX - oldX < 0) scale *=0.99;

    ///x += (mouseX-oldX); y += (mouseY - oldY);

    oldX = mouseX;  oldY = mouseY;

    display();

}

int main(int argc, char**argv)

{

    glutInit( &argc, argv);

    glutInitDisplayMode(GLUT_DOUBLE | GLUT_DEPTH);

    glutCreateWindow("Week05 keyboard");

    glutDisplayFunc(display);

    glutKeyboardFunc(keyboard);

    glutMouseFunc(mouse);

    glutMotionFunc(motion);

    glutMainLoop();

}

///

改成下列程式，加入打光

///

#include <GL/glut.h>

#include <stdio.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 x=150, y=150, z=0, scale=1.0;

int oldX=0, oldY=0;

void display()

{

    glClearColor(0.5, 0.5, 0.5, 1);///R, G, B, A其中A半透明功能,目前沒開

    glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);

    glPushMatrix();///備份矩陣

        glTranslatef( (x-150)/150.0 , -(y-150)/150.0, z);

        glScalef(scale, scale, scale);

        glColor3f(1,1,0);

        glutSolidTeapot(0.3);

    glPopMatrix();///還原矩陣

    glutSwapBuffers();

}

void keyboard(unsigned char key, int mouseX, int mouseY)

{

}

void mouse(int button, int state, int mouseX, int mouseY)

{///為了修飾瞬間移動的錯誤，改加了這條程式碼

    oldX =mouseX; oldY =mouseY;

}

void motion(int mouseX, int mouseY)

{

    if(mouseX - oldX > 0) scale *=1.01;

    if(mouseX - oldX < 0) scale *=0.99;

    ///x += (mouseX-oldX); y += (mouseY - oldY);

    oldX = mouseX;  oldY = mouseY;

    display();

}

int main(int argc, char**argv)

{

    glutInit( &argc, argv);

    glutInitDisplayMode(GLUT_DOUBLE | GLUT_DEPTH);

    glutCreateWindow("Week05 keyboard");

    glutDisplayFunc(display);

    glutKeyboardFunc(keyboard);

    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();

}

///

打出下列程式碼，使其可以用鍵盤按鍵執行移動、縮放和轉動的指令:

///

#include <GL/glut.h>

#include <stdio.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 x=150, y=150, z=0, scale=1.0, angle=0.0;

int oldX=0, oldY=0, now=1;///now: 1移動, 2轉動, 3縮放

void display()

{

    glClearColor(0.5, 0.5, 0.5, 1);///R, G, B, A其中A半透明功能,目前沒開

    glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);

    glPushMatrix();///備份矩陣

        glTranslatef( (x-150)/150.0 , -(y-150)/150.0, z);

        glRotatef(angle, 0,1,0);///對Y軸轉動

        glScalef(scale, scale, scale);///縮放成scale倍

        glColor3f(1,1,0);

        glutSolidTeapot(0.3);

    glPopMatrix();///還原矩陣

    glutSwapBuffers();

}

void keyboard(unsigned char key, int mouseX, int mouseY)

{

    if(key=='1' || key=='w' || key=='W') now=1;///移動

    if(key=='2' || key=='e' || key=='E') now=2;///轉動

    if(key=='3' || key=='r' || key=='R') now=3;///縮放

}

void mouse(int button, int state, int mouseX, int mouseY)

{///為了修飾瞬間移動的錯誤，改加了這條程式碼

    oldX =mouseX; oldY =mouseY;

}

void motion(int mouseX, int mouseY)

{

     if(now==1){///移動

        x += (mouseX - oldX);

        y += (mouseY - oldY);///移動

    }else if(now==2){///轉動

        angle += (mouseX - oldX);///轉動

    }else if(now==3){

        if( mouseX - oldX > 0) scale *= 1.01;///縮放

        if( mouseX - oldX < 0) scale *= 0.99;

    }

    oldX = mouseX;  oldY = mouseY;

    display();

}

int main(int argc, char**argv)

{

    glutInit( &argc, argv);

    glutInitDisplayMode(GLUT_DOUBLE | GLUT_DEPTH);

    glutCreateWindow("Week05 keyboard");

    glutDisplayFunc(display);

    glutKeyboardFunc(keyboard);

    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();

}

///

Ru的電腦圖學筆記>

 

💩Step1 主題是打光

    1.下載模型

        -下載 Windows.zip、Data.zip

        -將 Windows.zip解壓縮至 Windows 

        -將 Data.zip 裡的 Data 檔案丟到 Windows 資料夾

        -把裡面 Light Materal 打開：左上(左鍵旋轉、右鍵換模型)、左下(右鍵換Material)

    2.觀察模型

    3.偷程式碼時間

        -打開 codeblocks 建立新的 GLUT 檔案 

        -檔名：week06_light

        -點開 main.cpp 按 Ctrl+F 搜尋 light

💩Step2 自己做模型！

    1.將上衣步驟查到的程式碼下來，其他刪掉，保留下面兩個部分

    2.建立一個茶壺的模型

        -結合之前茶壺的程式，配合打光的程式碼，做出打光的茶壺

        -偷來的程式要放glutCreateWindow()之後、glutMainLoop()之前才會有效！

    3.完成後 Build&Run 可以看到一個暗暗的茶壺

        -也可以將 const GLfloat light_position[] = { 2.0f, 5.0f, -5.0f, 0.0f }; 這行的第三項改成 -5.0f

💩Step3 製作可以縮放、旋轉的茶壺

    1.建立新的 GLUT 檔案，檔名：week06_light_mouse_motin_rotate

    2.將打光程式、呼叫函式植入上週的程式碼

    3.執行，可以用滑鼠左右拖曳，茶壺會放大縮小

    4.在程式碼中加入旋轉值 angel，glRotatef(angle,0,1,0); 對Y軸轉動，執行茶壺會旋轉

    5.新增新的 GLUT 檔案，檔名：week06_keyboard_mouse_motion_all

        -讓移動、轉動、縮放同時存在(按鍵盤w/W/1顯示移動，按e/E/2顯示轉動，按r/R/3顯示縮放)

完成！！💖💖💖💖💖💖💖

烏鴉寫筆記 week06

6-1. jsyeh.org/3dcg10 下載 data 以及 win32

        解壓縮後打開 win32 中的 Light Material . exe 

        左上視窗：(拖曳)旋轉、(右鍵)換模型

        左下視窗：(右鍵)換材質

        右邊的參數：glLightfv(．．．)的 fv 是 float vector (陣列)

                                GLfloat light_pos (陣列)：代表光源位置

6-2. 打開範例GLUT程式後從其中傑出以下兩段程式碼後貼在茶壺GLUT專案

6-3. 將打光程式植入上週程式中

6-4. 在上周的程式(滑鼠拖曳移動和縮放)中加入鍵盤動作(W、Ｅ、Ｒ)和旋轉的程式碼

爆肝week06

Week06：打光

範例 http://jsyeh.org/3dcg10

1. 下載網頁中的data, win32

2. 將windows解壓縮, data.zip/data丟進解壓縮後的windows資料夾

 3.開啟Light Material.exe
    左上視窗點擊滑鼠右鍵：變更模型
    右邊視窗點擊滑鼠右鍵：變更調整參數
    左下視窗點擊滑鼠右鍵：變更模型的材質(Materials)

    右方函式glLightfv()：
    fv = float vector (浮點數陣列)

    glLightfv(GL_LIGHT0，GL_POSITION，light_pos)

                    　第0道光　　　位置                    陣列

打光Light

開啟OpenGL新專案，按下Ctrl+f搜尋light

複製light陣列宣告與函式呼叫，並加上之前的茶壺程式碼

```

#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 };

///以上是複製的程式碼(陣列宣告)

void display()

{

    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

        glColor3f(1, 1, 0);

        glutSolidTeapot(0.3);

    glutSwapBuffers();

}

int main(int argc, char** argv)

{

    glutInit( &argc, argv );

    glutInitDisplayMode( GLUT_DOUBLE | GLUT_DEPTH );

    glutCreateWindow("week06_light");

    glutDisplayFunc(display);

    ///以下是複製的程式碼(函式呼叫)

    ///複製的程式碼要放在glutCreateWindow()之後才有效

    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();ˇ一

}

```

或是將複製的陣列宣告與函式呼叫植入上週的程式碼

```

#include <stdio.h>///印出用

#include <GL/glut.h>

///打光陣列

/*這裡放陣列宣告*/

float x=150, y=150, z=0, scale=1.0;///座標設定為150, 150在視窗正中央

int oldX=0, oldY=0;

void display()

{

    glClearColor(0.5, 0.5, 0.5, 1);///灰色背景R,G,B,A 其中A為半透明Alpha值

    glClear(GL_COLOR_BUFFER_BIT |GL_DEPTH_BUFFER_BIT);

    glPushMatrix();///備分矩陣

        glTranslatef((x-150)/150.0, -(y-150)/150.0, z);

        glScalef(scale, scale, scale);///x,y,z縮放為 scale倍，維持原有比例

        glColor3f(1, 1, 0);

        glutSolidTeapot(0.3);

    glPopMatrix();///還原矩陣

    glutSwapBuffers();

}

void mouse(int button, int state, int mouseX, int mouseY)

{///重設圖案位置，避免瞬間移動的問題

    oldX = mouseX; oldY = mouseY;

}

void motion(int mouseX, int mouseY)

{

    if(mouseX-oldX >0) scale *=1.01;

    if(mouseX-oldX <0) scale *=0.99;///+-百分之一

    oldX = mouseX;

    oldY = mouseY;

    display();

}

void keyboard( unsigned char key, int mouseX, int mouseY )

{

}

int main(int argc, char** argv)

{

    glutInit( &argc, argv);

    glutInitDisplayMode( GLUT_DOUBLE | GLUT_DEPTH );

    glutCreateWindow("week05 keyboard");

    glutDisplayFunc(display);

    glutKeyboardFunc(keyboard);///鍵盤事件函式

    glutMouseFunc(mouse);

    glutMotionFunc(motion);

/*這裡放函式呼叫*/

    glutMainLoop();

}

```

續上週：旋轉

加上新的變數(angle)與glRoataef()函式

```

#include <stdio.h>///印出用

#include <GL/glut.h>

///打光陣列

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 x=150, y=150, z=0, scale=1.0, angle=0.0;///座標設定為150, 150在視窗正中央

int oldX=0, oldY=0;

void display()

{

    glClearColor(0.5, 0.5, 0.5, 1);///灰色背景R,G,B,A 其中A為半透明Alpha值

    glClear(GL_COLOR_BUFFER_BIT |GL_DEPTH_BUFFER_BIT);

    glPushMatrix();///備分矩陣

        glTranslatef((x-150)/150.0, -(y-150)/150.0, z);

        glRotatef(angle, 0, 1, 0);///對Y軸轉動

        glScalef(scale, scale, scale);///x,y,z縮放為 scale倍，維持原有比例

        glColor3f(1, 1, 0);

        glutSolidTeapot(0.3);

    glPopMatrix();///還原矩陣

    glutSwapBuffers();

}

void mouse(int button, int state, int mouseX, int mouseY)

{///重設圖案位置，避免瞬間移動的問題

    oldX = mouseX; oldY = mouseY;

}

void motion(int mouseX, int mouseY)

{

    

    angle += (mouseX-oldX);///轉動

    

    ///if(mouseX-oldX >0) scale *=1.01;///縮放

    ///if(mouseX-oldX <0) scale *=0.99;///+-百分之一

    ///oldX = mouseX;///移動

    ///oldY = mouseY;

    display();

}

void keyboard( unsigned char key, int mouseX, int mouseY )

{

}

int main(int argc, char** argv)

{

    glutInit( &argc, argv);

    glutInitDisplayMode( GLUT_DOUBLE | GLUT_DEPTH );

    glutCreateWindow("week05 keyboard");

    glutDisplayFunc(display);

    glutKeyboardFunc(keyboard);///鍵盤事件函式

    glutMouseFunc(mouse);

    glutMotionFunc(motion);

    ///打光函式

    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();

}

```

Keybaord()函式輸入切換功能

```

#include <stdio.h>///印出用

#include <GL/glut.h>

///打光陣列

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 x=150, y=150, z=0, scale=1.0, angle=0.0;///座標設定為150, 150在視窗正中央

int oldX=0, oldY=0, now=1;///設定now變數切換功能

void display()

{

    glClearColor(0.5, 0.5, 0.5, 1);///灰色背景R,G,B,A 其中A為半透明Alpha值

    glClear(GL_COLOR_BUFFER_BIT |GL_DEPTH_BUFFER_BIT);

    glPushMatrix();///備分矩陣

        glTranslatef((x-150)/150.0, -(y-150)/150.0, z);

        glRotatef(angle, 0, 1, 0);///對Y軸轉動

        glScalef(scale, scale, scale);///x,y,z縮放為 scale倍，維持原有比例

        glColor3f(1, 1, 0);

        glutSolidTeapot(0.3);

    glPopMatrix();///還原矩陣

    glutSwapBuffers();

}

void keyboard( unsigned char key, int mouseX, int mouseY )

{

    if(key=='1' || key=='w' || key=='W') now=1;///移動

    if(key=='2' || key=='e' || key=='E') now=2;///轉動

    if(key=='3' || key=='r' || key=='R') now=3;///縮放

}

void mouse(int button, int state, int mouseX, int mouseY)

{///重設圖案位置，避免瞬間移動的問題

    oldX = mouseX; oldY = mouseY;

}

void motion(int mouseX, int mouseY)

{

    if(now==1)

    {

        x += (mouseX-oldX);///移動

        y += (mouseY-oldY);

    }

    else if(now==2)

    {

        angle += (mouseX-oldX);///轉動

    }

    else if(now==3)

    {

        if(mouseX-oldX >0) scale *=1.01;///縮放

        if(mouseX-oldX <0) scale *=0.99;///+-百分之一

    }

    display();

}

int main(int argc, char** argv)

{

    glutInit( &argc, argv);

    glutInitDisplayMode( GLUT_DOUBLE | GLUT_DEPTH );

    glutCreateWindow("week05 keyboard");

    glutDisplayFunc(display);

    glutKeyboardFunc(keyboard);///鍵盤事件函式

    glutMouseFunc(mouse);

    glutMotionFunc(motion);

    ///打光函式

    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();

}

```