week 06電腦圖學之父

今天 小葉上課開頭所要介紹的是一位電腦圖學之父

名為Ivan Sutherland

到https://jsyeh.org/3dcg10/download

windows.zip.data.zip

然後至windows.zip download/windows\Transformation.exe.

data.zip至 download\windows\data\3D模型

如圖

           

接下來打開後可以看到一台車的畫面

點一下下方黑色的框框案右鍵的

[s]Swap translate/rotate

如下圖

車子移動可以有公轉和自轉的功能

打開CODEBLOCKS將上禮拜的程式碼複製貼上到今天的內容

#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("現在按下:%c 座標在:%d %d\n", key, x ,y);

}

int main(int argc, char**argv)

{

    glutInit(&argc, argv);

    glutInitDisplayMode(GLUT_DOUBLE | GLUT_DEPTH);

    glutCreateWindow("week06 keyboard");

    glutDisplayFunc(display);

    glutKeyboardFunc(keyboard);

    glutMainLoop();

}

如圖下

在茶壺上面按下A到Z的任何一個字母就會產生不同的座標出來

在新創一個freeglut:

將剛剛的程式碼複製過來做修改:

#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("現在按下:%c 座標在:%d %d\n", key, x ,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("week06 keyboard mouse motion");

    glutDisplayFunc(display);

    glutKeyboardFunc(keyboard);

    glutMouseFunc(mouse);

    glutMotionFunc(motion);

    glutMainLoop();

}

接下來再修改一些數值 讓茶壺的位置改變

#include <GL/glut.h>

#include <stdio.h>

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

void display()

{

    glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);

    glPushMatrix();

        glTranslatef( (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 )

{

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

}

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("week06 keyboard mouse motion");

    glutDisplayFunc(display);

    glutKeyboardFunc(keyboard);

    glutMouseFunc(mouse);

    glutMotionFunc(motion);

    glutMainLoop();

}

此圖為茶壺的變更位置

將屬標點至茶壺可以拉到不同的位置

另一種程式碼可以讓茶壺變大變小

#include <GL/glut.h>

#include <stdio.h>

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

void display()

{

    glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);

    glPushMatrix();

        glScalef( scale, scale, scale);

        glColor3f(1, 1 ,0);

        glutSolidTeapot(0.3);

    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 ,mouseX);

}

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

{

    oldX =  mouseX; oldY = mouseY;

}

void motion( int mouseX, int mouseY)

{

    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);

    glutCreateWindow("week06 keyboard mouse motion");

    glutDisplayFunc(display);

    glutKeyboardFunc(keyboard);

    glutMouseFunc(mouse);

    glutMotionFunc(motion);

    glutMainLoop();

}

大的茶壺

小的茶壺

other else:

#include <GL/glut.h>

#include <stdio.h>

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

int now=1;

void display()

{

    glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);

    glPushMatrix();

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

        glRotatef( angle, 0, 0, 1);

        glScalef( scale, scale, scale);

        glColor3f(1, 1 ,0);

        glutSolidTeapot(0.3);

    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 ,mouseX);

    if(key=='w' || key=='W') now=1;

    if(key=='e' || key=='E') now=2;

    if(key=='r' || key=='R') now=3;

}

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==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);

    glutCreateWindow("week06 keyboard mouse motion");

    glutDisplayFunc(display);

    glutKeyboardFunc(keyboard);

    glutMouseFunc(mouse);

    glutMotionFunc(motion);

    glutMainLoop();

}

茶壺最後的程式碼:

#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);

        glutSolidTeapot(0.3);

    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 ,mouseX);

    if(key=='w' || key=='W') now=1;

    if(key=='e' || key=='E') now=2;

    if(key=='r' || key=='R') now=3;

}

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;

    dispaly();

}

int main(int argc, char**argv)

{

    glutInit(&argc, argv);

    glutInitDisplayMode(GLUT_DOUBLE || GLUT_DEPTH);

    glutInitWindowSize(500, 500);

    glutCreateWindow("week06 keyboard mouse motion");

    glutDisplayFunc(display);

    glutKeyboardFunc(display);

    glutMouseFunc(mouse);

    glutMotionFunc(motion);

    glutMainLoop();

}