Week09 - 07161045

期中考

• 照老師上課教的主題, 把 OpenGL必背10函式(其實是11個函式) 寫出來

• 老師很貼心的花了兩天時間趕出一個模擬測驗網址，老師辛苦了!

GLUT函式

• 先開啟GLUT Project

• 老師先帶我們認識裡面glutSolid的程式碼

• 接下來，利用程式碼做出一個長方形

• 做出一個長方形程式碼如下:

#include <GL/glut.h>
void display()

{

    glClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

    glPushMatrix();

        glColor3f(0.2,0.3,0.6);

        glScalef(0.5,0.2,0.2);

        glutSolidCube(1);

    glPopMatrix();

    glutSwapBuffers();

}

int main(int argc, char *argv[])

{

    glutInit(&argc, argv);

    glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH);

    glutCreateWindow("Week09");

    glutDisplayFunc(display);

    glutMainLoop();

}

     

• 利用Cube程式碼做出其他長方形

• 做出兩個長方形程式碼如下:

#include <GL/glut.h>

void myCube()

{

    glPushMatrix();

        glScalef(0.5,0.2,0.2);

        glutSolidCube(1);

    glPopMatrix();

}

void display()

{

    glClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

    glPushMatrix();

        glColor3f(0.9,0.2,0.6);

        myCube();

        glTranslatef(0.4,0.1,0);

        glColor3f(0.6,0.9,0.3);

        myCube();

    glPopMatrix();

    glutSwapBuffers();

}

int main(int argc, char *argv[])

{

    glutInit(&argc, argv);

    glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH);

    glutCreateWindow("Week09");

    glutDisplayFunc(display);

    glutMainLoop();

}

     

T-R-T 轉動

• 利用angel程式碼讓長方形旋轉

• 旋轉長方形程式碼如下:

#include <GL/glut.h>

void myCube()

{

    glPushMatrix();

        glColor3f(0.9,0.2,0.6);

        glScalef(0.5,0.2,0.2);

        glutSolidCube(1);

    glPopMatrix();

}

float angel=0;

void display()

{

    glClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

    glPushMatrix();

        glRotatef(angel,0,0,1);

        myCube();

    glPopMatrix();

    angel++;

    glutSwapBuffers();

}

int main(int argc, char *argv[])

{

    glutInit(&argc, argv);

    glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH);

    glutCreateWindow("Week09");

    glutIdleFunc(display);

    glutDisplayFunc(display);

    glutMainLoop();

}

     

• 將轉動的中心點固定在畫面中心

• 程式碼如下:

#include <GL/glut.h>

void myCube()

{

    glPushMatrix();

        glColor3f(0.9,0.5,0.4);

        glScalef(0.5,0.2,0.2);

        glutSolidCube(1);

    glPopMatrix();

}

float angel=0;

void display()

{

    glClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

    glPushMatrix();

        glRotatef(angel,0,0,1);

        glTranslatef(0.22,0,0);(新增一行程式碼)

        myCube();

    glPopMatrix();

    angel++;

    glutSwapBuffers();

}

int main(int argc, char *argv[])

{

    glutInit(&argc, argv);

    glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH);

    glutCreateWindow("Week09");

    glutIdleFunc(display);

    glutDisplayFunc(display);

    glutMainLoop();

}

      

階層轉動

• 增加一個身體，順序不能錯!
• 程式碼如下:

#include <GL/glut.h>
void myCube()

{

    glPushMatrix();

        glColor3f(0.9,0.5,0.4);

        glScalef(0.5,0.2,0.2);

        glutSolidCube(1);

    glPopMatrix();

}

float angel=0;

void display()

{

    glClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

    glColor3f(0.5,0.6,0.);(新增一行程式碼)

    glutSolidCube(0.6);(新增一行程式碼)

 

    glPushMatrix();

        glTranslatef(0.3,0.3,0.3);(新增一行程式碼)

        glRotatef(angel,0,0,1);

        glTranslatef(0.22,0,0);

        myCube();

    glPopMatrix();

    angel++;

    glutSwapBuffers();

}

int main(int argc, char *argv[])

{

    glutInit(&argc, argv);

    glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH);

    glutCreateWindow("Week09");

    glutIdleFunc(display);

    glutDisplayFunc(display);

    glutMainLoop();

}