鹿的電腦圖學筆記week13

 Step01:

1.先寫入

void display(){

    glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);

    glutSwapBuffers();

}

int main(int argc,char** argv){

    glutInit(&argc,argv);

    glutInitDisplayMode(GLUT_DOUBLE|GLUT_DEPTH);

    glutInitWindowSize(600,600);

    glutCreateWindow("week13_RECT_TRT");

    glutDisplayFunc(display);

    glutMainLoop();

}

2.在display()加    glRectf(0.3,0.5,-0.3,-0.5);//矩形

3.再加(畫手臂)

 glPushMatrix();

        glColor3f(1,0,0);///紅

        glRectf(0.3,0.5,0.7,0.3);///手臂

    glPopMatrix();

4.把手臂旋轉中心放到身體中心

glTranslatef(-0.3,-0.4,0);///把手臂旋轉中心放到中心

5.旋轉手臂角度

float angle=45;

glRotatef(angle,0,0,1);///旋轉

6.手臂掛回身體(右上)

glTranslatef(0.3,0.4,0);///手臂掛到身體

7.讓手臂可以轉動(滑鼠控制)

float 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();///重畫畫面

}

main加入

glutMouseFunc(mouse);

glutMotionFunc(motion);

Step02:再加上手臂

1.加在上個glutPushMatrix()裡

glPushMatrix();

            glRotatef(angle,0,0,1);///旋轉

            glTranslatef(-0.3,-0.4,0);///把手臂旋轉中心放到中心

            glColor3f(0,1,0);

            glRectf(0.7,0.5,1.0,0.3);///手臂

glPopMatrix();

(要先把上面Rotate註解)

2.加入glTranslatef(0.7,.4,0);(取消紅手臂Rotate註解)

Step03:加入左手

1.複製glPushMatrix()程式，把X值數值設為負數(因為對稱在反方向)

glPushMatrix();

        glTranslatef(-0.3,0.4,0);///手臂掛到身體

        glRotatef(angle,0,0,1);///旋轉

        glTranslatef(0.3,-0.4,0);///把手臂旋轉中心放到中心

        glColor3f(1,0,0);///紅

        glRectf(-0.3,0.5,-0.7,0.3);///上手臂

        glPushMatrix();

            glTranslatef(-0.7,.4,0);

            glRotatef(angle,0,0,1);///旋轉

            glTranslatef(0.7,-0.4,0);///把手臂旋轉中心放到中心

            glColor3f(0,1,0);///紅

            glRectf(-0.7,0.5,-1.0,0.3);///下手臂

        glPopMatrix();

    glPopMatrix();

2.利用鍵盤和滑鼠搭配指定關節

float angle[20];

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;

}

0對應上右臂;1對應下右臂;2對應上左臂;3對應下左臂;

motion裡面angle+=(x-oldX);改成angle[angleID]+=(x-oldX);

glPushMatrix()的angle改成angle[0],angle[1],angle[2],angle[3]

main()加入glutKeyboardFunc(keyboard);