OpenGL yoyo程序麻烦

Question

我无法让我的yoyo计划工作;随着yoyo移动和旋转，我有一条不断增长和缩小的弦乐，但是我的琴弦随着yoyo一起移动。当yoyo上下旋转时，我需要让弦保持静止。我必须将琴弦和yoyo的动作分配到一个按钮上。介意帮我处理我的代码？ （也请原谅愚蠢的yoyo;我想在设计之前完成编程）

#include "stdafx.h"
#include <GL/glut.h>
#include <GL/gl.h>
#include <math.h>

void firstDisplay();
void secondDisplay();
void movement();
void init();
void drawButton();
void handleButton(int button, int state, int x, int y);

const int Width=720;
const int Height = 480;

static float PI = 3.14159;
static float radius = 25;
static float INC= (PI/30);
static GLfloat spin = 0.0;
static GLfloat deltaz = .001;
static GLfloat deltax = 0.0;
static GLfloat deltay = 0.0;

//######################################################### Main #########################################################
void main(int argc, char** argv)

{
    glutInit(&argc, argv);

    glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGB | GLUT_MULTISAMPLE | GLUT_DEPTH);
    glutInitWindowSize(Width,Height);
    glutInitWindowPosition(0,0);

    glutCreateWindow("Yoyo");

    glutDisplayFunc(firstDisplay);
    glutMouseFunc(handleButton);
    init();
    glutMainLoop();

    return;
}
//######################################################### Draw Button #########################################################
void drawButton()
{
glBegin(GL_POLYGON); 
float theta;
    for (theta = 0.0; theta <= 2 * PI; theta += INC)
    {
        glColor3f(1,0,1);
        glVertex2f(40 + radius * cos(theta), 40 + radius*sin(theta));
    }
glEnd();
}
//######################################################### Second Display #########################################################
void secondDisplay()
{
float theta;

glClear(GL_COLOR_BUFFER_BIT);

glBegin(GL_POLYGON); //Here is the yoyo
    for (theta = 0.0; theta <= 2 * PI; theta += INC)
    {
        glColor3f(1,1,1);
        float radius1 = 75;
        glVertex2f(360 + radius1 * cos(theta), 80 + radius1*sin(theta));
    }
glEnd();

glBegin(GL_POLYGON); //Here is the yoyo design
    for (theta = 0.0; theta <= 2 * PI; theta += INC)
    {
        glColor3f(0,1,1);
        float radius1 = 55;
        glVertex2f(350 + radius1 * cos(theta), 90 + radius1*sin(theta));
    }
glEnd();

glFlush();

return;
}
//######################################################### First Display #########################################################
void firstDisplay()
{
glClear(GL_COLOR_BUFFER_BIT);

float theta;
glBegin(GL_POLYGON); //Here is the yoyo
    for (theta = 0.0; theta <= 2 * PI; theta += INC)
    {
        glColor3f(1,1,1);
        float radius1 = 75;
        glVertex2f(360 + radius1 * cos(theta), 80 + radius1*sin(theta));
    }
glEnd();

glBegin(GL_POLYGON); //Here is the yoyo
    for (theta = 0.0; theta <= 2 * PI; theta += INC)
    {
        glColor3f(0,1,1);
        float radius1 = 55;
        glVertex2f(350 + radius1 * cos(theta), 90 + radius1*sin(theta));
    }
glEnd();

drawButton();
glutSwapBuffers();
glFlush();
return;
}
//######################################################### Draw String #########################################################
void draw_string()
{ 
glColor3f(1.0, 0.0, 0.0); 
glBegin(GL_POLYGON);
glVertex3f(363, 8.25 - deltay, 0.0);
glVertex3f(357, 8.25 - deltay, 0);
glVertex3f(357, 6, 0);
glVertex3f(363, 6, 0);
glEnd();
}
//######################################################### Button Controls #########################################################
void handleButton(int button, int state, int x, int y)
{
    static int index =-1;

    if(button == GLUT_LEFT_BUTTON)
    {
        if(y>= 10 && y<= 100)
        {
            if (state == GLUT_DOWN)
            {
                glutIdleFunc(movement);
            }
            if (state == GLUT_UP)
            {
                glutIdleFunc(NULL);
            }
        }

        glutSwapBuffers();
    }
}
//######################################################### Yoyo Movement #########################################################
void movement()
{
    static int goingup = 0;

glClear(GL_COLOR_BUFFER_BIT);

if(goingup==1)
{
    deltay -= 6;

    if(deltay <= 0)
    {
        goingup = 0;
    }

    spin = spin -5;
    if(spin < 360)
    {
        spin = spin + 360;
    }
}
if(goingup == 0)
{
    deltay += 6;

    if (deltay >= 315)
    {
        goingup = 1;
    }

    spin = spin +5;
    if(spin < 360)
    {
        spin = spin + 360;
    }
}

glPushMatrix();
glTranslatef(360+deltax, 80+deltay, 0.0);
glRotatef(spin,0.0,0.0,1.0);
glTranslatef(-360,-80, 0.0);
secondDisplay();
draw_string();
glPopMatrix();
drawButton();
glutSwapBuffers();
}

//######################################################### Init #########################################################
void init()
{
    glClearColor(0, 0, 0, 0.0);
    glColor3f(1, 1, 1);

    glMatrixMode(GL_PROJECTION);
    glLoadIdentity();
    gluOrtho2D(0,Width,Height,0);

    return;
}