ander week06

 電腦圖學之父youtube 影片

介紹他的故事，如何在上課發表有關第一篇電腦圖學的論文。

https://www.youtube.com/watch?v=6orsmFndx_o

下載window.zip data.zip 下載 window transformation .exe

自轉 vs 公轉

鍵盤函式glut keyboard

    輸入顯示座標

讓茶壺能用滑鼠拖曳，更換座標，

利用滑鼠左右移動，縮放茶壺大小，一次縮0.0.1 一次放大0.01

可以用滑鼠移動，按下R鍵，放大縮小按下E鍵可以旋轉

程式碼:

    #include <GL/glut.h>

#include <stdio.h>

float x=250, y=250, z=0, scale=1.0,angle=0.0,oldX, oldY;

int now=1;

void display()

{

    glClearColor(0.5,0.5,0.5,1);

    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

    glPushMatrix();

        glTranslatef((x-250)/250.0,-(y-250)/250.0,z);

        glRotatef(angle, 0,0,1);

        glScalef(scale,scale,scale);

    glColor3f(1,1,0);///黃色的

        glutSolidTeapot(0.3);///茶壼

        glPopMatrix();

    glutSwapBuffers();

}

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

{

   // printf("現在按下:%c 座標在: %d %d\n",key,mouseX,mouseY);

   if(key=='w'|| key=='W')now=1;//移動

   if(key=='e'|| key=='E')now=2;//旋轉

    if(key=='r'|| key=='R')now=3;//縮放

   }

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

{

    oldX=mouseX; oldY=mouseY;

}

void motion (int mouseX, int mouseY)

{

    if(now==1){

    x+=(mouseX-oldX);

    y+=(mouseY-oldY);

    }else if(now==2){

    angle+=(mouseX-oldX);

    }else if(now==3){

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

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

    }

    oldX =mouseX; oldY=mouseY;

    display();

}

int main( int argc, char**argv )

{

    glutInit( &argc, argv);

    glutInitDisplayMode( GLUT_DOUBLE | GLUT_DEPTH );

    glutInitWindowSize(500,500);

    glutCreateWindow("week05=6 keyboard");

    glutDisplayFunc(display);///Display顯示

    glutKeyboardFunc(keyboard);

    glutMouseFunc(mouse);

    glutMotionFunc(motion);

    glutMainLoop();

}