我在进行这种修改时遇到了困难。我想将 2 个实体（此处称为手指）放在一起，以便在按下“o”或“c”键时它们可以打开和关闭。我无法获得正确的坐标，因此它们可以靠近绿色物体。所以它看起来像一只有 2 个手指的手。
这是所需输出的链接http://www.tinyuploads.com/gallery/view/zO6rYg
#include <cstdlib>
#include <cmath>
#include <vector>
#include <iostream>
#ifdef __APPLE__
#include <GLUT/glut.h>
//#include <gl.h>
//#include <glut.h>
#else
# include <GL/glut.h>
#endif
using namespace std;
#define ESC 27
static GLfloat red[]={1,0,0}, green[]={0,1,0}, blue[]={0,0,1};
static int shoulder=0, elbow=0, finger1 = 0, finger2 = 0;
static int xrot=0, yrot=0, zrot=0;
static GLfloat xshift=-1.0, yshift=0.0, zoom=-3.0;
/* some basic GL initialization */
void init()
{
glClearColor(1.0,1.0,1.0,0.0);
glShadeModel(GL_FLAT);
glEnable(GL_DEPTH_TEST);
glEnable(GL_CULL_FACE);
glCullFace(GL_BACK);
}
/* The display callback */
/* Put the "fingers" code somewhere in this function*/
void draw_stuff()
{
glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);
glLoadIdentity();
glTranslatef(0.0,0.0,-5.0);
glPushMatrix();
glTranslatef(xshift,yshift,zoom);
glRotatef((GLfloat)xrot,1.0,0.0,0.0);
glRotatef((GLfloat)yrot,0.0,1.0,0.0);
glRotatef((GLfloat)zrot,0.0,0.0,1.0);
glColor3fv(red);
glPushMatrix();
glTranslatef(-1.0,0.0,0.0);
glRotatef((GLfloat)shoulder,0.0,0.0,1.0);
glTranslatef(1.0,0.0,0.0);
glPushMatrix();
glScalef(2.0,0.4,1.0);
glutSolidCube(1.0);
glPopMatrix();
glColor3fv(green);
glTranslatef(1.0,0.0,0.0);
glRotatef((GLfloat)elbow,0.0,0.0,1.0);
glTranslatef(1.0,0.0,0.0);
glPushMatrix();
glScalef(2.0,0.4,1.0);
glutSolidCube(1.0);
glPopMatrix();
glColor3fv(blue);
glTranslatef(1.0,0.2,0.0);
glRotatef((GLfloat)finger1,0.0,0.0,1.0);
glRotatef((GLfloat)finger2,0.0,0.0,1.0);
glTranslatef(1.0,0.0,0.0);
glPushMatrix();
glScalef(2.0,0.4,1.0);
glutSolidCube(0.25);
glPopMatrix();
glColor3fv(blue);
glTranslatef(-1.0,0.0,1.0);
glRotatef((GLfloat)finger1,0.0,0.0,1.0);
glRotatef((GLfloat)finger2,0.0,0.0,1.0);
glTranslatef(1.0,0.0,0.0);
glPushMatrix();
glScalef(2.0,0.4,1.0);
glutSolidCube(0.25);
glPopMatrix();
glPopMatrix();
glPopMatrix();
glutSwapBuffers();
}
/* the window-reshape callback */
void reshape(int w, int h)
{
GLfloat myFov = 65.0, myNear = 1.0, myFar = 30.0;
glViewport(0,0,(GLsizei)w,(GLsizei)h);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
gluPerspective(myFov,(GLfloat)w/(GLfloat)h, myNear, myFar);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
}
/* The basic keyboard controls, callback for glutKeyboardFunc() */
void kb(unsigned char key, int x, int y)
{
switch(key)
{
case 's':
shoulder=(shoulder+5)%360;
glutPostRedisplay();
break;
case 'S':
shoulder=(shoulder-5)%360;
glutPostRedisplay();
break;
case 'e':
elbow=(elbow+5)%360;
glutPostRedisplay();
break;
case 'E':
elbow=(elbow-5)%360;
glutPostRedisplay();
break;
case 'C' |'c':
/* close the "hand" */
finger1=(finger1+5)%360;
finger2=(finger2+5)%360;
glutPostRedisplay();
break;
case 'O' | 'o':
/* open the "hand" */
finger1=(finger1-5)%360;
finger2=(finger2-5)%360;
glutPostRedisplay();
break;
case 'x':
xshift+=.25;
glutPostRedisplay();
break;
case 'X':
xshift-=.25;
glutPostRedisplay();
break;
case 'y':
yshift+=.25;
glutPostRedisplay();
break;
case 'Y':
yshift-=.25;
glutPostRedisplay();
break;
case 'r':
case 'R':
xrot=yrot=zrot=shoulder=elbow=0;
xshift=-1.0;
yshift=0.0;
zoom=-3.0;
glutPostRedisplay();
break;
case 'z':
zrot=(zrot-1)%360;
glutPostRedisplay();
break;
case 'Z':
zrot=(zrot+1)%360;
glutPostRedisplay();
break;
case ESC:
exit(0);
break;
default:
break;
}
}
/* The "special" keyboard controls, callback for glutSpecialFunc() */
void skb(int key, int x, int y)
{
switch(key)
{
case GLUT_KEY_UP:
zoom+=1;
glutPostRedisplay();
break;
case GLUT_KEY_DOWN:
zoom-=1;
glutPostRedisplay();
break;
case GLUT_KEY_RIGHT:
yrot=(yrot-1)%360;
glutPostRedisplay();
break;
case GLUT_KEY_LEFT:
yrot=(yrot+1)%360;
glutPostRedisplay();
break;
case GLUT_KEY_PAGE_UP:
xrot=(xrot-1)%360;
glutPostRedisplay();
break;
case GLUT_KEY_PAGE_DOWN:
xrot=(xrot+1)%360;
glutPostRedisplay();
break;
default:
break;
}
}
void printInteraction(void)
{
cout << "s/S: Positive/negative shoulder rotation" << endl;
cout << "e/E: Positive/negative elbow rotation" << endl
<< "O/C: Open/Close the hand -- YOU GET TO IMPLEMENT THIS" << endl
<< "x/X: Positive/negative X-axis shift of the model" << endl
<< "y/Y: Positive/negative Y-axis shift of the model" << endl
<< "UP/DOWN ARROWS: (zoom) Z-axis shift of the model" << endl
<< "LEFT/RIGHT ARROWS: Y-axis rotations" << endl
<< "PAGE UP/DOWN: X-axis rotations" << endl
<< "ESC: exit" << endl;
}
int main(int argc, char **argv)
{
int winWidth = 800, winHeight = 600, winPosX = 100, winPosY = 100; // OpenGL window
printInteraction();
glutInit(&argc,argv);
glutInitDisplayMode(GLUT_DOUBLE|GLUT_RGB|GLUT_DEPTH);
glutInitWindowSize(600,400);
glutInitWindowPosition(0,0);
glutCreateWindow("window");
init();
glutDisplayFunc(draw_stuff);
glutReshapeFunc(reshape);
glutKeyboardFunc(kb);
glutSpecialFunc(skb);
glutMainLoop();
return 0;
}