Week 05 彣禎的上課筆記

1.主題:移動Translate.旋轉Rotate.縮放Scale

(1)先到http://www.cmlab.csie.ntu.edu.tw/~jsyeh/3dcg10/ 下載3個檔案

(2)把windows.data解壓縮，再把data資料夾和glut32.dull放到windows資料裡

(3)再打開Transformation檔案

2.會移動的茶壺(用座標移動)

(1)用Code Blocks開啟GLUT方案(freeglut)，再修改程式碼

多加glPushMatrix(); ///備份起來       

glTranslatef(0,1,0);
        glutSolidTeapot(0.3);
    glPopMatrix(); ///還原回去

3.會移動的茶壺(用滑鼠拖移移動)

#include <GL/glut.h>
float mouseX=0,mouseY=0;static void display(void)
{
    glClear(GL_COLOR_BUFFER_BIT| GL_DEPTH_BUFFER_BIT);   

    glPushMatrix(); ///備份起來       

    glTranslatef(mouseX,mouseY,0);
    glutSolidTeapot(0.3);
    glPopMatrix(); ///還原回去

    glutSwapBuffers();
}
void motion(int x,int y)
{
    mouseX=(x-150)/150.0;
    mouseY=-(y-150)/150.0;
    glutPostRedisplay();
}

int main(int argc, char *argv[])
{
    glutInit(&argc, argv);

    glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH);

    glutCreateWindow("GLUT Shapes");

    glutDisplayFunc(display);

    glutMotionFunc(motion);

    glutMainLoop();

    return EXIT_SUCCESS;
}

 4.會縮放的茶壺

把glTranslatef(mouseX,mouseY,0); 改成glScalef(mouseX,mouseY,0);

#include <GL/glut.h>
float mouseX=0,mouseY=0;
static void display(void)
{
    glClear(GL_COLOR_BUFFER_BIT| GL_DEPTH_BUFFER_BIT); ///清除舊的畫面   

    glPushMatrix(); ///備份起來
        glScalef(mouseX,mouseY,0); ///改Size縮放
        glutSolidTeapot(0.3);
    glPopMatrix(); ///還原回去

    glutSwapBuffers(); ///交換繪圖的memory buffer,才能畫出來
}
void motion(int x,int y)
{
    mouseX=(x-150)/150.0;
    mouseY=-(y-150)/150.0;
    glutPostRedisplay(); ///貼一張3M Post便利貼，告訴電腦的GLUT要重畫畫面Re display

}

int main(int argc, char *argv[])
{
    glutInit(&argc, argv);

    glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH);

    glutCreateWindow("GLUT Shapes");

    glutDisplayFunc(display);

    glutMotionFunc(motion);

    glutMainLoop();

    return EXIT_SUCCESS;
}

5.會旋轉的茶壺

滑鼠沿著X軸旋轉

#include <GL/glut.h>
float mouseX=0,mouseY=0,rotX=0;
static void display(void)
{
    glClear(GL_COLOR_BUFFER_BIT| GL_DEPTH_BUFFER_BIT); ///清除舊的畫面   

    glPushMatrix(); ///備份起來
        //glScalef(mouseX,mouseY,0); ///改Size縮放

        glRotatef(rotX,0,0,1);       

    glutSolidTeapot(0.3);
    glPopMatrix(); ///還原回去

    glutSwapBuffers(); ///交換繪圖的memory buffer,才能畫出來
}
void motion(int x,int y)
{
    mouseX=(x-150)/150.0;
    mouseY=-(y-150)/150.0;

    rotX=x;
    glutPostRedisplay(); ///貼一張3M Post便利貼，告訴電腦的GLUT要重畫畫面Re display

}

int main(int argc, char *argv[])
{
    glutInit(&argc, argv);

    glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH);

    glutCreateWindow("GLUT Shapes");

    glutDisplayFunc(display);

    glutMotionFunc(motion);

    glutMainLoop();

    return EXIT_SUCCESS;
}

 6.去試Transformation.exe改軸(x,y,z)，並猜測會往哪邊轉