電腦圖學作業_week13

先畫長方形

用glRectf加上座標來畫出長方形

#include <GL/glut.h>

void display()

{

     glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

     glRectf(0.3,0.5,-0.3,-0.5);

     glutSwapBuffers();

}

int main(int argc,char**argv)

{

    glutInit(&argc,argv);

    glutInitDisplayMode(GLUT_DOUBLE | GLUT_DEPTH);

    glutInitWindowSize(600,600);

    glutCreateWindow("week13 rect");

    glutDisplayFunc(display);

    glutMainLoop();

}

把手臂的旋轉中心放在正中心

手臂位置跑到中心點

加上rotate讓手臂旋轉

再加上Translatef讓手臂回到原來的位置

#include <GL/glut.h>

float angle=45;

void display()

{

     glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

     glColor3f(1,1,1);

     glRectf(0.3,0.5,-0.3,-0.5);

     glPushMatrix();

        glTranslatef(0.3,0.4,0);

        glRotatef(angle,0,0,1);

        glTranslatef(-0.3,-0.4,0);

        glColor3f(1,0,0);

        glRectf(0.3,0.5,0.7,0.3);

     glPopMatrix();

     glutSwapBuffers();

}

int main(int argc,char**argv)

{

    glutInit(&argc,argv);

    glutInitDisplayMode(GLUT_DOUBLE | GLUT_DEPTH);

    ///glutInitWindowSize(600,600);

    glutCreateWindow("week13 rect");

    glutDisplayFunc(display);

    glutMainLoop();

}

我們加上mouse motion

讓手臂能在滑鼠按住時跟著轉動

然後我們要畫第二個關節

如果要畫左手臂把X座標的正負顛倒就可以了

#include <GL/glut.h>

float angle=0,oldX=0;

void mouse(int button,int state,int x,int y )

{

    oldX=x;

}

void motion(int x,int y)

{

    angle += (x-oldX);

    oldX=x;

    glutPostRedisplay();

}

void display()

{

     glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

     glColor3f(1,1,1);

     glRectf(0.3,0.5,-0.3,-0.5);

     glPushMatrix();

        glTranslatef(0.3,0.4,0);

        glRotatef(angle,0,0,1);

        glTranslatef(-0.3,-0.4,0);

        glColor3f(1,0,0);

        glRectf(0.3,0.5,0.7,0.3);

        glPushMatrix();

            glTranslatef(0.7,0.4,0);

            glRotatef(angle,0,0,1);

            glTranslatef(-0.7,-0.4,0);

            glColor3f(0,1,0);

            glRectf(0.7,0.5,1.0,0.3);

        glPopMatrix();

     glPopMatrix();

     glPushMatrix();

        glTranslatef(-0.3,0.4,0);

        glRotatef(angle,0,0,1);

        glTranslatef(+0.3,-0.4,0);

        glColor3f(1,0,0);

        glRectf(-0.3,0.5,-0.7,0.3);

        glPushMatrix();

            glTranslatef(-0.7,0.4,0);

            glRotatef(angle,0,0,1);

            glTranslatef(+0.7,-0.4,0);

            glColor3f(0,1,0);

            glRectf(-0.7,0.5,-1.0,0.3);

        glPopMatrix();

     glPopMatrix();

     glutSwapBuffers();

}

int main(int argc,char**argv)

{

    glutInit(&argc,argv);

    glutInitDisplayMode(GLUT_DOUBLE | GLUT_DEPTH);

    ///glutInitWindowSize(600,600);

    glutCreateWindow("week13 rect new");

    glutMouseFunc(mouse);

    glutMotionFunc(motion);

    glutDisplayFunc(display);

    glutMainLoop();

}

我們可以用keyboard函式當按下鍵盤就可以旋轉對應的關節

#include <GL/glut.h>

float angle[20],oldX=0;

int angleID=0;

void keyboard(unsigned char key,int x, int y)

{

    if(key=='0')angleID=0;

    if(key=='1')angleID=1;

    if(key=='2')angleID=2;

    if(key=='3')angleID=3;

}

void mouse(int button,int state,int x,int y )

{

    oldX=x;

}

void motion(int x,int y)

{

    angle[angleID] += (x-oldX);

    oldX=x;

    glutPostRedisplay();

}

void display()

{

     glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

     glColor3f(1,1,1);

     glRectf(0.3,0.5,-0.3,-0.5);

     glPushMatrix();

        glTranslatef(0.3,0.4,0);

        glRotatef(angle[0],0,0,1);

        glTranslatef(-0.3,-0.4,0);

        glColor3f(1,0,0);

        glRectf(0.3,0.5,0.7,0.3);

        glPushMatrix();

            glTranslatef(0.7,0.4,0);

            glRotatef(angle[1],0,0,1);

            glTranslatef(-0.7,-0.4,0);

            glColor3f(0,1,0);

            glRectf(0.7,0.5,1.0,0.3);

        glPopMatrix();

     glPopMatrix();

     glPushMatrix();

        glTranslatef(-0.3,0.4,0);

        glRotatef(angle[2],0,0,1);

        glTranslatef(+0.3,-0.4,0);

        glColor3f(1,0,0);

        glRectf(-0.3,0.5,-0.7,0.3);

        glPushMatrix();

            glTranslatef(-0.7,0.4,0);

            glRotatef(angle[3],0,0,1);

            glTranslatef(+0.7,-0.4,0);

            glColor3f(0,1,0);

            glRectf(-0.7,0.5,-1.0,0.3);

        glPopMatrix();

     glPopMatrix();

     glutSwapBuffers();

}

int main(int argc,char**argv)

{

    glutInit(&argc,argv);

    glutInitDisplayMode(GLUT_DOUBLE | GLUT_DEPTH);

    ///glutInitWindowSize(600,600);

    glutCreateWindow("week13 rect new");

    glutKeyboardFunc(keyboard);

    glutMouseFunc(mouse);

    glutMotionFunc(motion);

    glutDisplayFunc(display);

    glutMainLoop();

}