電腦圖學week06

(1)特定軸轉動
先做一個對中心軸旋轉的藍色小棒子。 

程式碼如下

#include <GL/glut.h>

float angle=0;

void display()

{

    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

    glPushMatrix();

    glRotatef(angle, 0, 0, 1);///對中心轉動

    glTranslatef(0.25,0,0);///把關節移道中間

    glScalef(0.5,0.1,0.1);///細長的

    glColor3f(0,0,1);///藍色的

    glutSolidCube(1);

    glPopMatrix();

    glutSwapBuffers();

    angle++;

}

int main(int argc, char**argv)

{

    glutInit( &argc, argv);

    glutInitDisplayMode(GLUT_DOUBLE | GLUT_DEPTH);

    glutCreateWindow("08160935");

    glutDisplayFunc(display);

    glutIdleFunc(display);

    glutMainLoop();

}

然後做個身體讓他移到右上角當成手臂旋轉。

程式碼如下

#include <GL/glut.h>

float angle=0;

void hand()

{

    glPushMatrix();

    glScalef(0.5,0.1,0.1);

    glColor3f(0,0,1);

    glutSolidCube(1);///方塊

    glPopMatrix();

}

void display()

{

    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

    glColor3f(1,1,1); glutSolidCube(1);///大身體

    glPushMatrix();

    glTranslatef(0.5,0.5,0);///整個移到右上掛著

    glRotatef(angle, 0, 0, 1);///對中心轉動

    glTranslatef(0.25,0,0);///把關節移道中間

    hand();

    glPopMatrix();

    glutSwapBuffers();

    angle++;

}

int main(int argc, char**argv)

{

    glutInit( &argc, argv);

    glutInitDisplayMode(GLUT_DOUBLE | GLUT_DEPTH);

    glutCreateWindow("08160935");

    glutDisplayFunc(display);

    glutIdleFunc(display);

    glutMainLoop();

}

(2)階層性轉動

做完上手臂，現在做下手臂。

程式碼如下

#include <GL/glut.h>

float angle=0;

void hand()

{

    glPushMatrix();

    glScalef(0.5,0.1,0.1);

    glColor3f(0,0,1);

    glutSolidCube(1);///方塊

    glPopMatrix();

}

void display()

{

    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

    glColor3f(1,1,1); glutSolidCube(0.5);///大身體

    glPushMatrix();

    glTranslatef(0.25,0.25,0);///整個移到右上掛著

    glRotatef(angle, 0, 0, 1);///對中心轉動

    glTranslatef(0.25,0,0);///把關節移道中間

    hand();///上手臂

    glPushMatrix();///新東西，glPushMatrix() & glPopMatrix()容易錯

        glTranslatef(0.25,0,0);

        glRotatef(angle,0,0,1);

        glTranslatef(0.25,0,0);

        hand();///下手臂

    glPopMatrix();

    glPopMatrix();

    glutSwapBuffers();

    angle++;

}

int main(int argc, char**argv)

{

    glutInit( &argc, argv);

    glutInitDisplayMode(GLUT_DOUBLE | GLUT_DEPTH);

    glutCreateWindow("08160935");

    glutDisplayFunc(display);

    glutIdleFunc(display);

    glutMainLoop();

}

左手臂

程式碼如下

#include <GL/glut.h>

float angle=0;

void hand()

{

    glPushMatrix();

    glScalef(0.5,0.1,0.1);

    glColor3f(0,0,1);

    glutSolidCube(1);///方塊

    glPopMatrix();

}

void display()

{

    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

    glColor3f(1,1,1); glutSolidCube(0.5);///大身體

    glPushMatrix();

    glTranslatef(0.25,0.25,0);///整個移到右上掛著

    glRotatef(angle, 0, 0, 1);///對中心轉動

    glTranslatef(0.25,0,0);///把關節移道中間

    hand();///上手臂

        glPushMatrix();

            glTranslatef(0.25,0,0);

            glRotatef(angle,0,0,1);

            glTranslatef(0.25,0,0);

            hand();///下手臂

        glPopMatrix();

    glPopMatrix();

    glPushMatrix();

    glTranslatef(-0.25,0.25,0);///整個移到左上掛著

    glRotatef(angle, 0, 0, 1);///對中心轉動

    glTranslatef(-0.25,0,0);///把關節移道中間

    hand();///上手臂

        glPushMatrix();

            glTranslatef(-0.25,0,0);///只位移不改角度

            glRotatef(angle,0,0,1);

            glTranslatef(-0.25,0,0);

            hand();///下手臂

        glPopMatrix();

    glPopMatrix();

    glutSwapBuffers();

    angle++;

}

int main(int argc, char**argv)

{

    glutInit( &argc, argv);

    glutInitDisplayMode(GLUT_DOUBLE | GLUT_DEPTH);

    glutCreateWindow("08160935");

    glutDisplayFunc(display);

    glutIdleFunc(display);

    glutMainLoop();

}