2022年3月28日 星期一

09160473-week06

電腦圖學之父 Ivan Sutherland 






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與前幾周一樣
去這個網址(https://jsyeh.org/3dcg10/)下載windows跟data這2個檔案




***鍵盤記錄座標***


1.將下列程式碼打上

#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();

    return 0;

}


2.執行結果


先用滑鼠點擊視窗任一處，再敲擊鍵盤英文字母可得出座標



***鍵盤紀錄座標+滑鼠拖曳***

1.將下列程式碼打上

#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);///Maya:w
        ///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,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("week06 keyboard");

    glutDisplayFunc(display);
    glutKeyboardFunc(keyboard);
    glutMouseFunc(mouse);
    glutMotionFunc(motion);


    glutMainLoop();

    return 0;

}

2.執行程式



3.將程式修改一下，讓茶壺可以根據滑鼠移動來縮放大小

#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();
        //glTranslatef((x-150)/150.0,-(y-150)/150.0,z);///Maya:w
        ///glRotatef(angle,0,0,1);
    glScalef(scale,scale,scale);///Maya r
    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,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);
    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");

    glutDisplayFunc(display);
    glutKeyboardFunc(keyboard);
    glutMouseFunc(mouse);
    glutMotionFunc(motion);


    glutMainLoop();

    return 0;

}


接著執行



4.設定w,e,r3鍵來進行茶壺的移動、旋轉、縮放的動作

#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;///1:移動,2:旋轉,3:縮放
void display()

{

    glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);
    glPushMatrix();
    glTranslatef((x-150)/150.0,-(y-150)/150.0,z);///Maya:w
    glRotatef(angle,0,0,1);
    glScalef(scale,scale,scale);///Maya r
    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,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)///移動
    {
        x+=(mouseX-oldX);
        y+=(mouseY-oldY);
    }else if(now==3){///縮放
        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");

    glutDisplayFunc(display);
    glutKeyboardFunc(keyboard);
    glutMouseFunc(mouse);
    glutMotionFunc(motion);


    glutMainLoop();

    return 0;

}

執行結果



6.新增旋轉動作
#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;///1:移動,2:旋轉,3:縮放
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);///Maya:w
    glRotatef(angle,0,0,1);///Maya:e
    glScalef(scale,scale,scale);///Maya r
    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,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)///移動
    {
        x+=(mouseX-oldX);
        y+=(mouseY-oldY);
    }else if(now==2){///旋轉
        angle+=(mouseX-oldX);
    }else if(now==3){///縮放
        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");

    glutDisplayFunc(display);
    glutKeyboardFunc(keyboard);
    glutMouseFunc(mouse);
    glutMotionFunc(motion);


    glutMainLoop();

    return 0;

}

執行結果





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