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按1234可以改變關節移動

#include <GL/glut.h>
#include <stdio.h>
FILE *fout=NULL;
FILE * fin=NULL;
float oldX=0, oldY=0;
void drawBody()
{
    glPushMatrix();
    glScalef(1, 0.5, 0.5);
    glutSolidCube(1);
    glPopMatrix();
}
void drawArm()
{
    glPushMatrix();
    glScalef(0.6, 0.3, 0.3);
    glutSolidCube(1);
    glPopMatrix();
}
float angle[10];
int angleID=1, playing=0;
void display()
{
    {
        ///Lighting
        glColor3ub(166,132,100);
        GLfloat pos[]= {0, 0, -1, 0};
        glLightfv(GL_LIGHT0, GL_POSITION, pos);
        glEnable(GL_LIGHT0);
        //glEnable(GL_LIGHTING);
        glEnable(GL_DEPTH_TEST);
        glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
    }
    glPushMatrix();
    glTranslatef(0.5, 0, 0);///最後一步, 把樓下的 "會對Arm Joint做旋轉的東西" 再移到右上 掛上去 ver 4
    glRotatef(angle[1], 0,0,1);///把下面整團, 都對中間做旋轉 ver 3
    glTranslatef(0.25, 0,0);///這是把它往右移, Arm Joint在中間 ver 2
    drawArm();///這是個Arm ver 1  Right Upper Arm
    glPushMatrix();
    glTranslatef(0.25, 0, 0);///最後一步, 把樓下的 "會對Arm Joint做旋轉的東西" 再移到右上 掛上去 ver 4
    glRotatef(angle[2], 0,0,1);///把下面整團, 都對中間做旋轉 ver 3
    glTranslatef(0.25, 0,0);///這是把它往右移, Arm Joint在中間 ver 2
    drawArm(); ///Right Lower Arm
    glPopMatrix();
    glPopMatrix();
    glPushMatrix();
    glTranslatef(-0.5, 0, 0);///最後一步, 把樓下的 "會對Arm Joint做旋轉的東西" 再移到右上 掛上去 ver 4
    glRotatef(-angle[3], 0,0,1);///把下面整團, 都對中間做旋轉 ver 3
    glTranslatef(-0.25, 0,0);///這是把它往右移, Arm Joint在中間 ver 2
    drawArm();///這是個Arm ver 1  Left Upper Arm
    glPushMatrix();
    glTranslatef(-0.25, 0, 0);///最後一步, 把樓下的 "會對Arm Joint做旋轉的東西" 再移到右上 掛上去 ver 4
    glRotatef(-angle[4], 0,0,1);///把下面整團, 都對中間做旋轉 ver 3
    glTranslatef(-0.25, 0,0);///這是把它往右移, Arm Joint在中間 ver 2
    drawArm(); ///Left Lower Arm
    glPopMatrix();
    glPopMatrix();
    drawBody();
    glFlush();
}
void keyboard(unsigned char key,int x,int y)
{
    if(key=='1') angleID=1;
    if(key=='2') angleID=2;
    if(key=='3') angleID=3;
    if(key=='4') angleID=4;
    if(key=='p') playing=1;

}
void motion(int x, int y)
{
    angle[angleID] -= y - oldY;
    oldY=y;
    oldX=x;

    if(fout==NULL)fout=fopen("a.txt","w+");
    for(int i=0;i<10;i++){
    printf("%.1f ",angle[i]);
    fprintf(fout,"%.1f ",angle[i]);
    }
    printf("\n");fprintf(fout, "\n");
}
void mouse(int button, int state, int x, int y)
{
    if(state==GLUT_DOWN)
    {
        oldX=x;
        oldY=y;
    }
}
void timer(int t)
{
    glutTimerFunc(20, timer, t+1);
    //angle++;
    if(playing==1){
        if(fin==NULL) fin=fopen("a.txt","r");
        for(int i=0;i<10;i++){
            fscanf(fin, "%f", &angle[i]);
        }
    }
    glutPostRedisplay();
}
int main(int argc, char**argv)
{
    glutInit(&argc, argv);
    glutCreateWindow("T-R-T test");
    glutDisplayFunc(display);
    glutTimerFunc(20, timer, 0);
    glutMouseFunc(mouse);
    glutMotionFunc(motion);
    glutKeyboardFunc(keyboard);
    glutMainLoop();
}