(圖學筆記)電腦圖學Week05

  Week 05

Step01 介紹電腦圖學之父 Ivan Sutherland Sketchpad 並嘗試再現其研究

Step02-1 打開網頁https://jsyeh.org/3dcg10/ 下載win32.zip 以及data.zip

step02-2 解壓縮 windows至windows資料夾並且將data資料夾放入windows資料夾

step02-3 打開Tranformation.exe 嘗試使用，下面區域可試交換兩行程式碼(移動，轉動)會有自轉，公轉效果。

Step 03-1 將程式碼key入

#include <GL/glut.h>

#include <stdio.h>

void display()

{

    glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);

    glColor3f(1,1,0);

    glutSolidTeapot(0.3);

    glutSwapBuffers();

}

void keyboard(unsigned char key,int x,int y)

{

    printf("你按了 %c 在 %d %d坐標\n",key,x,y);

}

int main(int argc,char** argv)

{

    glutInit(&argc,argv);

    glutInitDisplayMode(GLUT_DOUBLE | GLUT_DEPTH);

    glutCreateWindow("Week05 keyboard");

    glutDisplayFunc(display);

    glutKeyboardFunc(keyboard);

    glutMainLoop();

}

可得到成果

            

Step 03-2將程式碼改為

#include <GL/glut.h>

#include <stdio.h>

void display()

{

    glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);

    glColor3f(1,1,0);

    glutSolidTeapot(0.3);

    glutSwapBuffers();

}

void keyboard(unsigned char key,int x,int y)

{

}

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

{

}

void motion(int x,int y)

{

}

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();

}

Step 03-3將程式碼改為

#include <GL/glut.h>

#include <stdio.h>

float x=0,y=0,z=0;

int oldx=0,oldy=0;

void display()

{

    glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);

    glPushMatrix();

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

        glColor3f(1,1,0);

        glutSolidTeapot(0.3);

    glPopMatrix();

    glutSwapBuffers();

}

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

{

}

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

{

}

void motion(int mousex,int mousey)

{

    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();

}

可以用滑鼠拉茶壺了

Step 03-4將程式碼改為

#include <GL/glut.h>

#include <stdio.h>

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

int oldx=0,oldy=0;

void display()

{

    glClearColor(0.5,0.5,0.5,1);

    glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);

    glPushMatrix();

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

        glColor3f(1,1,0);

        glutSolidTeapot(0.3);

    glPopMatrix();

    glutSwapBuffers();

}

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

{

}

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

{

    oldx=mousex;oldy=mousey;

}

void motion(int mousex,int mousey)

{

    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();

}

解決瞬間移動的問題

Step 03-5將程式碼改為

#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);

    glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);

    glPushMatrix();

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

        glScalef(scale,scale,scale);

        glColor3f(1,1,0);

        glutSolidTeapot(0.3);

    glPopMatrix();

    glutSwapBuffers();

}

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

{

}

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

{

    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();

}

可放大縮小