逐一打開盒子的頂部

我被要求製作一個盒子，上面有4個三角形，按o和c，盒子頂部的4個三角形依次打開和關閉。逐一打開盒子的頂部

我用三角形組成在它上面的盒子和他們移動一下子，我試圖操縱每個三角形希望藉此能夠打開和關閉一個接一個步驟，但我被困在算法和碼。

下面是完整的代碼：

#include <GL/glut.h> 
#include <math.h> 
#include <stdio.h> 
#include <stdlib.h> 

#define PI 3.14159265 
static int step = 0, step1, step2, step3, step4; 

/* camera location in longitude and latitude */ 
static float alpha = 0.0; 
static float beta = PI/6.0; 

/* position of camera */ 
static GLdouble cpos[3]; 

/* position of light source */ 
static GLfloat lpos[] = { -2.5, 2.5, 3.0, 1.0 }; 

/* vectors to specify material properties */ 
static GLfloat black[] = { 0.0, 0.0, 0.0, 1.0 }; 
static GLfloat white[] = { 1.0, 1.0, 1.0, 1.0 }; 
static GLfloat gray[] = { 0.5, 0.5, 0.5, 1.0 }; 
static GLfloat red[] = { 1.0, 0.0, 0.0, 1.0 }; 
static GLfloat green[] = { 0.0, 1.0, 0.0, 1.0 }; 
static GLfloat blue[] = { 0.0, 0.0, 1.0, 1.0 }; 
static GLfloat yellow[] = { 1.0, 1.0, 0.0, 1.0 }; 
static GLfloat magenta[] = { 1.0, 0.0, 1.0, 1.0 }; 
static GLfloat cyan[] = { 0.0, 1.0, 1.0, 1.0 }; 
static GLfloat darkcyan[] = { 0.0, 0.4, 0.4, 1.0 }; 

static bool topFinishedOpening = false; 
static float stepBefore = step; 
void writemessage() 
{ 
     printf("HW-1"); 
} 

void init(void) 
{ 
     writemessage(); 

     glClearColor(0.0, 0.0, 0.0, 0.0); 
     glEnable(GL_DEPTH_TEST); 
     glShadeModel(GL_SMOOTH); 

     /* initially GL_FILL mode (default), later GL_LINE to show wireframe */ 
     glPolygonMode(GL_FRONT_AND_BACK, GL_FILL); 

     glEnable(GL_LIGHTING); 
     glLightModeli(GL_LIGHT_MODEL_TWO_SIDE, GL_TRUE); 
     glEnable(GL_LIGHT0); 
} 


void reshape(int w, int h) 
{ 
     glViewport(0, 0, (GLsizei)w, (GLsizei)h); 

     glMatrixMode(GL_PROJECTION); 
     glLoadIdentity(); 
     gluPerspective(45.0, (GLfloat)w/(GLfloat)h, 1.0, 20.0); 

     glMatrixMode(GL_MODELVIEW); 
} 

void display(void) 
{ 
     static int i; 
     static double angle1, angle2, angle3, angle4, Y1, Z1, normalY1, normalZ1, Y2, Z2, normalY2, normalZ2, X3, Y3, normalX3, normalY3, X4, Y4, normalX4, normalY4; 
     glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); 

     /* initialize (modelview) matrix */ 
     glLoadIdentity(); 

     /* update camera position */ 
     cpos[0] = 15.0 * cos(beta) * sin(alpha); 
     cpos[1] = 15.0 * sin(beta); 
     cpos[2] = 15.0 * cos(beta) * cos(alpha); 
     gluLookAt(cpos[0], cpos[1], cpos[2], 0.0, 1.0, 0.0, 0.0, 1.0, 0.0); 

     /* set current light source position */ 
     glLightfv(GL_LIGHT0, GL_POSITION, lpos); 

     /* draw sphere to show light source */ 
     glMaterialfv(GL_FRONT, GL_EMISSION, white); 
     glPushMatrix(); 
     glTranslatef(lpos[0], lpos[1], lpos[2]); 
     glutSolidSphere(0.1, 10, 8); 
     glPopMatrix(); 

     /* remaining objects do not look as if they emit light */ 
     glMaterialfv(GL_FRONT, GL_EMISSION, black); 

     /* draw a tabletop */ 
     glMaterialfv(GL_FRONT_AND_BACK, GL_AMBIENT_AND_DIFFUSE, gray); 
     glMaterialfv(GL_FRONT_AND_BACK, GL_SPECULAR, white); 
     glMaterialf(GL_FRONT_AND_BACK, GL_SHININESS, 64); 
     glNormal3f(0.0, 1.0, 0.0); 
     glBegin(GL_POLYGON); 
     glVertex3f(-5.0, -0.001, -3.0); 
     glVertex3f(-5.0, -0.001, 5.0); 
     glVertex3f(5.0, -0.001, 5.0); 
     glVertex3f(5.0, -0.001, -3.0); 
     glEnd(); 

     printf("Angle Number 1: %f\n", (angle1 * (180.0/PI))); 
     printf("Angle Number 2: %f\n", (angle2 * (180.0/PI))); 
     printf("Angle Number 3: %f\n", (angle3 * (180.0/PI))); 
     printf("Angle Number 4: %f\n", (angle4 * (180.0/PI))); 
     printf("\n"); 

     if ((step - stepBefore) > 0){ 

       step1 = step;   step2 = step; 
       step3 = step; 
       step4 = step; 

     } 
     else if ((step - stepBefore) < 0){ 
       step1 = step;   step2 = step; 
       step3 = step; 
       step4 = step; 

     } 
     else{ 
       step1 = step;   step2 = step; 
       step3 = step; 
       step4 = step; 

     } 

     // first 
     glMaterialfv(GL_FRONT, GL_EMISSION, black); 
     glMaterialfv(GL_BACK, GL_EMISSION, black); 
     glMaterialfv(GL_FRONT_AND_BACK, GL_AMBIENT_AND_DIFFUSE, red); 
     angle1 = ((float)step1/180) * PI; 
     Y1 = 2.0 + 2.0 * sin(angle1); 
     Z1 = -1.0 + 2.0 * cos(angle1); 
     normalY1 = cos(angle1); 
     normalZ1 = -sin(angle1); 
     glNormal3f(0, normalY1, normalZ1); 
     glBegin(GL_POLYGON); 
     glVertex3f(-3.0, 2.0, -1.0); 
     glVertex3f(3.0, 2.0, -1.0); 
     glVertex3f(0, Y1, Z1); 
     glEnd(); 

     // second 
     glMaterialfv(GL_FRONT, GL_EMISSION, black); 
     glMaterialfv(GL_BACK, GL_EMISSION, black); 
     glMaterialfv(GL_FRONT_AND_BACK, GL_AMBIENT_AND_DIFFUSE, red); 
     angle2 = ((float)step2/180) * PI; 
     Y2 = 2.0 + 2.0 * sin(angle2); 
     Z2 = 3.0 + -2.0 * cos(angle2); 
     normalY2 = cos(angle2); 
     normalZ2 = sin(angle2); 
     glNormal3f(0, normalY2, normalZ2); 
     glBegin(GL_POLYGON); 
     glVertex3f(-3.0, 2.0, 3.0); 
     glVertex3f(3.0, 2.0, 3.0); 
     glVertex3f(0, Y2, Z2); 
     glEnd(); 

     // third 
     glMaterialfv(GL_FRONT, GL_EMISSION, black); 
     glMaterialfv(GL_BACK, GL_EMISSION, black); 
     glMaterialfv(GL_FRONT_AND_BACK, GL_AMBIENT_AND_DIFFUSE, red); 
     angle3 = ((float)step3/180) * PI; 
     X3 = 3.0 - 3.0 * cos(angle3); 
     Y3 = 2.0 + 2.0 * sin(angle3); 
     normalX3 = sin(angle3); 
     normalY3 = cos(angle3); 
     glNormal3f(normalX3, normalY3, 0); 
     glBegin(GL_POLYGON); 
     glVertex3f(3.0, 2.0, 3.0); 
     glVertex3f(3.0, 2.0, -1.0); 
     glVertex3f(X3, Y3, 1); 
     glEnd(); 

     // fourth 
     glMaterialfv(GL_FRONT, GL_EMISSION, black); 
     glMaterialfv(GL_BACK, GL_EMISSION, black); 
     glMaterialfv(GL_FRONT_AND_BACK, GL_AMBIENT_AND_DIFFUSE, red); 
     angle4 = ((float)step4/180) * PI; 
     X4 = -3.0 + 3.0 * cos(angle4); 
     Y4 = 2.0 + 2.0 * sin(angle4); 
     normalX4 = sin(angle4); 
     normalY4 = cos(angle4); 
     glNormal3f(normalX4, normalY4, 0); 
     glBegin(GL_POLYGON); 
     glVertex3f(-3.0, 2.0, 3.0); 
     glVertex3f(-3.0, 2.0, -1.0); 
     glVertex3f(X4, Y4, 1); 
     glEnd(); 


     // back 
     glMaterialfv(GL_FRONT, GL_EMISSION, black); 
     glMaterialfv(GL_BACK, GL_EMISSION, black); 
     glMaterialfv(GL_FRONT_AND_BACK, GL_AMBIENT_AND_DIFFUSE, red); 
     glBegin(GL_POLYGON); 
     glVertex3f(3.0, 0.0, -1.0); 
     glVertex3f(3.0, 2.0, -1.0); 
     glVertex3f(-3.0, 2.0, -1.0); 
     glVertex3f(-3.0, 0.0, -1.0); 
     glEnd(); 

     // front 
     glMaterialfv(GL_FRONT, GL_EMISSION, black); 
     glMaterialfv(GL_BACK, GL_EMISSION, black); 
     glMaterialfv(GL_FRONT_AND_BACK, GL_AMBIENT_AND_DIFFUSE, red); 
     glBegin(GL_POLYGON); 
     glVertex3f(3.0, 0.0, 3.0); 
     glVertex3f(3.0, 2.0, 3.0); 
     glVertex3f(-3.0, 2.0, 3.0); 
     glVertex3f(-3.0, 0.0, 3.0); 
     glEnd(); 

     // right 
     glMaterialfv(GL_FRONT, GL_EMISSION, black); 
     glMaterialfv(GL_BACK, GL_EMISSION, black); 
     glMaterialfv(GL_FRONT_AND_BACK, GL_AMBIENT_AND_DIFFUSE, red); 
     glBegin(GL_POLYGON); 
     glVertex3f(3.0, 2.0, -1.0); 
     glVertex3f(3.0, 2.0, 3.0); 
     glVertex3f(3.0, 0.0, 3.0); 
     glVertex3f(3.0, 0.0, -1.0); 
     glEnd(); 

     // left 
     glMaterialfv(GL_FRONT, GL_EMISSION, black); 
     glMaterialfv(GL_BACK, GL_EMISSION, black); 
     glMaterialfv(GL_FRONT_AND_BACK, GL_AMBIENT_AND_DIFFUSE, red); 
     glBegin(GL_POLYGON); 
     glVertex3f(-3.0, 2.0, -1.0); 
     glVertex3f(-3.0, 2.0, 3.0); 
     glVertex3f(-3.0, 0.0, 3.0); 
     glVertex3f(-3.0, 0.0, -1.0); 
     glEnd(); 

     // buttom 
     glMaterialfv(GL_FRONT, GL_EMISSION, black); 
     glMaterialfv(GL_BACK, GL_EMISSION, black); 
     glMaterialfv(GL_FRONT_AND_BACK, GL_AMBIENT_AND_DIFFUSE, red); 
     glBegin(GL_POLYGON); 
     glVertex3f(-3.0, 0.0, -1.0); 
     glVertex3f(-3.0, 0.0, 3.0); 
     glVertex3f(3.0, 0.0, 3.0); 
     glVertex3f(3.0, 0.0, -1.0); 
     glEnd(); 


     glFlush(); 
     glutSwapBuffers(); 
} 


void keyboard(unsigned char key, int x, int y) 
{ 
     static int polygonmode[2]; 

     switch (key) { 
     case 27: 
       exit(0); 
       break; 

       /* open and close the top */ 
     case 'o': 
       if (step < 90) { stepBefore = step*1.0; step = step + 2; } 
       glutPostRedisplay(); 
       break; 
     case 'c': 
       if (step > 0) { 
         stepBefore = step*1.0; step = step - 2; 
       } 
       glutPostRedisplay(); 
       break; 
       /* w for switching between GL_FILL and GL_LINE 
       * Using a query command glGetIntegerv() we obtain two integers 
       * indicating the current GL_POLYGON_MODE for FRONT and BACK faces. 
       * Look up glIsEnabled() that may be found useful. */ 
     case 'w': 
       glGetIntegerv(GL_POLYGON_MODE, polygonmode); 
       if (polygonmode[0] == GL_FILL) 
         glPolygonMode(GL_FRONT_AND_BACK, GL_LINE); 
       else glPolygonMode(GL_FRONT_AND_BACK, GL_FILL); 
       glutPostRedisplay(); 
       break; 

       /* control lpos */ 
     case 'x': 
       lpos[0] = lpos[0] + 0.2; 
       glutPostRedisplay(); 
       break; 
     case 'X': 
       lpos[0] = lpos[0] - 0.2; 
       glutPostRedisplay(); 
       break; 
     case 'y': 
       lpos[1] = lpos[1] + 0.2; 
       glutPostRedisplay(); 
       break; 
     case 'Y': 
       lpos[1] = lpos[1] - 0.2; 
       glutPostRedisplay(); 
       break; 
     case 'z': 
       lpos[2] = lpos[2] + 0.2; 
       glutPostRedisplay(); 
       break; 
     case 'Z': 
       lpos[2] = lpos[2] - 0.2; 
       glutPostRedisplay(); 
       break; 

     default: 
       break; 
     } 
} 
void specialkey(GLint key, int x, int y) 
{ 
     switch (key) { 
     case GLUT_KEY_RIGHT: 
       alpha = alpha + PI/180; 
       if (alpha > 2 * PI) alpha = alpha - 2 * PI; 
       glutPostRedisplay(); 
       break; 
     case GLUT_KEY_LEFT: 
       alpha = alpha - PI/180; 
       if (alpha < 0) alpha = alpha + 2 * PI; 
       glutPostRedisplay(); 
       break; 
     case GLUT_KEY_UP: 
       if (beta < 0.45*PI) beta = beta + PI/180; 
       glutPostRedisplay(); 
       break; 
     case GLUT_KEY_DOWN: 
       if (beta > 0.05*PI) beta = beta - PI/180; 
       glutPostRedisplay(); 
       break; 

     default: 
       break; 
     } 
} 

int main(int argc, char** argv) 
{ 
     glutInit(&argc, argv); 
     glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGB | GLUT_DEPTH); 
     glutInitWindowSize(800, 800); 
     glutInitWindowPosition(100, 100); 
     glutCreateWindow(argv[0]); 
     init(); 
     glutDisplayFunc(display); 
     glutReshapeFunc(reshape); 
     glutKeyboardFunc(keyboard); 
     glutSpecialFunc(specialkey); 
     glutMainLoop(); 
     return 0; 
}

截圖： enter image description here

來源

2014-09-21 Apha

行112和行130之間的邏輯似乎很有趣。 'if'和'else'之間沒有什麼區別？ – starrify 2014-09-21 07:12:53

完成這個邏輯花了我三天，最終我沒有成功。 – Apha 2014-09-21 07:14:05

[*題外咆哮*]嘆氣，我希望我的大學過去給這樣的作業 – 2014-09-21 07:14:23

我添加了一個簡單的技巧，以你的代碼，使其工作，通過表達4個三角形的角地位step在一起。具體而言：不是一系列[0,90]，我做了你的變量step[0,360]，並在其中[0,90]部分爲step1，[90,180]是step2範圍等

請參見下面的代碼。搜索/* Modifications to your code */以查看我添加的內容。
代碼已經過測試並按預期工作。

請注意，我不認爲我的竅門是解決此問題的好設計。我只是提供了一些提示，並希望您自己編寫代碼。 :)

#include <GL/glut.h> 
#include <math.h> 
#include <stdio.h> 
#include <stdlib.h> 

#define PI 3.14159265 
static int step = 0, step1, step2, step3, step4; 

/* camera location in longitude and latitude */ 
static float alpha = 0.0; 
static float beta = PI/6.0; 

/* position of camera */ 
static GLdouble cpos[3]; 

/* position of light source */ 
static GLfloat lpos[] = { -2.5, 2.5, 3.0, 1.0 }; 

/* vectors to specify material properties */ 
static GLfloat black[] = { 0.0, 0.0, 0.0, 1.0 }; 
static GLfloat white[] = { 1.0, 1.0, 1.0, 1.0 }; 
static GLfloat gray[] = { 0.5, 0.5, 0.5, 1.0 }; 
static GLfloat red[] = { 1.0, 0.0, 0.0, 1.0 }; 
static GLfloat green[] = { 0.0, 1.0, 0.0, 1.0 }; 
static GLfloat blue[] = { 0.0, 0.0, 1.0, 1.0 }; 
static GLfloat yellow[] = { 1.0, 1.0, 0.0, 1.0 }; 
static GLfloat magenta[] = { 1.0, 0.0, 1.0, 1.0 }; 
static GLfloat cyan[] = { 0.0, 1.0, 1.0, 1.0 }; 
static GLfloat darkcyan[] = { 0.0, 0.4, 0.4, 1.0 }; 

static bool topFinishedOpening = false; 
static float stepBefore = step; 
void writemessage() 
{ 
     printf("HW-1"); 
} 

void init(void) 
{ 
     writemessage(); 

     glClearColor(0.0, 0.0, 0.0, 0.0); 
     glEnable(GL_DEPTH_TEST); 
     glShadeModel(GL_SMOOTH); 

     /* initially GL_FILL mode (default), later GL_LINE to show wireframe */ 
     glPolygonMode(GL_FRONT_AND_BACK, GL_FILL); 

     glEnable(GL_LIGHTING); 
     glLightModeli(GL_LIGHT_MODEL_TWO_SIDE, GL_TRUE); 
     glEnable(GL_LIGHT0); 
} 


void reshape(int w, int h) 
{ 
     glViewport(0, 0, (GLsizei)w, (GLsizei)h); 

     glMatrixMode(GL_PROJECTION); 
     glLoadIdentity(); 
     gluPerspective(45.0, (GLfloat)w/(GLfloat)h, 1.0, 20.0); 

     glMatrixMode(GL_MODELVIEW); 
} 

void display(void) 
{ 
     static int i; 
     static double angle1, angle2, angle3, angle4, Y1, Z1, normalY1, normalZ1, Y2, Z2, normalY2, normalZ2, X3, Y3, normalX3, normalY3, X4, Y4, normalX4, normalY4; 
     glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); 

     /* initialize (modelview) matrix */ 
     glLoadIdentity(); 

     /* update camera position */ 
     cpos[0] = 15.0 * cos(beta) * sin(alpha); 
     cpos[1] = 15.0 * sin(beta); 
     cpos[2] = 15.0 * cos(beta) * cos(alpha); 
     gluLookAt(cpos[0], cpos[1], cpos[2], 0.0, 1.0, 0.0, 0.0, 1.0, 0.0); 

     /* set current light source position */ 
     glLightfv(GL_LIGHT0, GL_POSITION, lpos); 

     /* draw sphere to show light source */ 
     glMaterialfv(GL_FRONT, GL_EMISSION, white); 
     glPushMatrix(); 
     glTranslatef(lpos[0], lpos[1], lpos[2]); 
     glutSolidSphere(0.1, 10, 8); 
     glPopMatrix(); 

     /* remaining objects do not look as if they emit light */ 
     glMaterialfv(GL_FRONT, GL_EMISSION, black); 

     /* draw a tabletop */ 
     glMaterialfv(GL_FRONT_AND_BACK, GL_AMBIENT_AND_DIFFUSE, gray); 
     glMaterialfv(GL_FRONT_AND_BACK, GL_SPECULAR, white); 
     glMaterialf(GL_FRONT_AND_BACK, GL_SHININESS, 64); 
     glNormal3f(0.0, 1.0, 0.0); 
     glBegin(GL_POLYGON); 
     glVertex3f(-5.0, -0.001, -3.0); 
     glVertex3f(-5.0, -0.001, 5.0); 
     glVertex3f(5.0, -0.001, 5.0); 
     glVertex3f(5.0, -0.001, -3.0); 
     glEnd(); 

     printf("Angle Number 1: %f\n", (angle1 * (180.0/PI))); 
     printf("Angle Number 2: %f\n", (angle2 * (180.0/PI))); 
     printf("Angle Number 3: %f\n", (angle3 * (180.0/PI))); 
     printf("Angle Number 4: %f\n", (angle4 * (180.0/PI))); 
     printf("\n"); 

#if 0 
     if ((step - stepBefore) > 0){ 

       step1 = step;   step2 = step; 
       step3 = step; 
       step4 = step; 

     } 
     else if ((step - stepBefore) < 0){ 
       step1 = step;   step2 = step; 
       step3 = step; 
       step4 = step; 

     } 
     else{ 
       step1 = step;   step2 = step; 
       step3 = step; 
       step4 = step; 

     } 
#else 
     /* Modifications to your code */ 
     if (step >= 270) 
     { 
      step1 = 90; 
      step2 = 90; 
      step3 = 90; 
      step4 = step - 270; 
     } 
     else if (step >= 180) // implies step < 270 
     { 
      step1 = 90; 
      step2 = 90; 
      step3 = step - 180; 
      step4 = 0; 
     } 
     else if (step >= 90) // implies step < 180 
     { 
      step1 = 90; 
      step2 = step - 90; 
      step3 = 0; 
      step4 = 0; 
     } 
     else if (step >= 0) // implies step < 90 
     { 
      step1 = step; 
      step2 = 0; 
      step3 = 0; 
      step4 = 0; 
     } 
     else 
      ; // error handling since this shall not happen 
#endif 

     // first 
     glMaterialfv(GL_FRONT, GL_EMISSION, black); 
     glMaterialfv(GL_BACK, GL_EMISSION, black); 
     glMaterialfv(GL_FRONT_AND_BACK, GL_AMBIENT_AND_DIFFUSE, red); 
     angle1 = ((float)step1/180) * PI; 
     Y1 = 2.0 + 2.0 * sin(angle1); 
     Z1 = -1.0 + 2.0 * cos(angle1); 
     normalY1 = cos(angle1); 
     normalZ1 = -sin(angle1); 
     glNormal3f(0, normalY1, normalZ1); 
     glBegin(GL_POLYGON); 
     glVertex3f(-3.0, 2.0, -1.0); 
     glVertex3f(3.0, 2.0, -1.0); 
     glVertex3f(0, Y1, Z1); 
     glEnd(); 

     // second 
     glMaterialfv(GL_FRONT, GL_EMISSION, black); 
     glMaterialfv(GL_BACK, GL_EMISSION, black); 
     glMaterialfv(GL_FRONT_AND_BACK, GL_AMBIENT_AND_DIFFUSE, red); 
     angle2 = ((float)step2/180) * PI; 
     Y2 = 2.0 + 2.0 * sin(angle2); 
     Z2 = 3.0 + -2.0 * cos(angle2); 
     normalY2 = cos(angle2); 
     normalZ2 = sin(angle2); 
     glNormal3f(0, normalY2, normalZ2); 
     glBegin(GL_POLYGON); 
     glVertex3f(-3.0, 2.0, 3.0); 
     glVertex3f(3.0, 2.0, 3.0); 
     glVertex3f(0, Y2, Z2); 
     glEnd(); 

     // third 
     glMaterialfv(GL_FRONT, GL_EMISSION, black); 
     glMaterialfv(GL_BACK, GL_EMISSION, black); 
     glMaterialfv(GL_FRONT_AND_BACK, GL_AMBIENT_AND_DIFFUSE, red); 
     angle3 = ((float)step3/180) * PI; 
     X3 = 3.0 - 3.0 * cos(angle3); 
     Y3 = 2.0 + 2.0 * sin(angle3); 
     normalX3 = sin(angle3); 
     normalY3 = cos(angle3); 
     glNormal3f(normalX3, normalY3, 0); 
     glBegin(GL_POLYGON); 
     glVertex3f(3.0, 2.0, 3.0); 
     glVertex3f(3.0, 2.0, -1.0); 
     glVertex3f(X3, Y3, 1); 
     glEnd(); 

     // fourth 
     glMaterialfv(GL_FRONT, GL_EMISSION, black); 
     glMaterialfv(GL_BACK, GL_EMISSION, black); 
     glMaterialfv(GL_FRONT_AND_BACK, GL_AMBIENT_AND_DIFFUSE, red); 
     angle4 = ((float)step4/180) * PI; 
     X4 = -3.0 + 3.0 * cos(angle4); 
     Y4 = 2.0 + 2.0 * sin(angle4); 
     normalX4 = sin(angle4); 
     normalY4 = cos(angle4); 
     glNormal3f(normalX4, normalY4, 0); 
     glBegin(GL_POLYGON); 
     glVertex3f(-3.0, 2.0, 3.0); 
     glVertex3f(-3.0, 2.0, -1.0); 
     glVertex3f(X4, Y4, 1); 
     glEnd(); 


     // back 
     glMaterialfv(GL_FRONT, GL_EMISSION, black); 
     glMaterialfv(GL_BACK, GL_EMISSION, black); 
     glMaterialfv(GL_FRONT_AND_BACK, GL_AMBIENT_AND_DIFFUSE, red); 
     glBegin(GL_POLYGON); 
     glVertex3f(3.0, 0.0, -1.0); 
     glVertex3f(3.0, 2.0, -1.0); 
     glVertex3f(-3.0, 2.0, -1.0); 
     glVertex3f(-3.0, 0.0, -1.0); 
     glEnd(); 

     // front 
     glMaterialfv(GL_FRONT, GL_EMISSION, black); 
     glMaterialfv(GL_BACK, GL_EMISSION, black); 
     glMaterialfv(GL_FRONT_AND_BACK, GL_AMBIENT_AND_DIFFUSE, red); 
     glBegin(GL_POLYGON); 
     glVertex3f(3.0, 0.0, 3.0); 
     glVertex3f(3.0, 2.0, 3.0); 
     glVertex3f(-3.0, 2.0, 3.0); 
     glVertex3f(-3.0, 0.0, 3.0); 
     glEnd(); 

     // right 
     glMaterialfv(GL_FRONT, GL_EMISSION, black); 
     glMaterialfv(GL_BACK, GL_EMISSION, black); 
     glMaterialfv(GL_FRONT_AND_BACK, GL_AMBIENT_AND_DIFFUSE, red); 
     glBegin(GL_POLYGON); 
     glVertex3f(3.0, 2.0, -1.0); 
     glVertex3f(3.0, 2.0, 3.0); 
     glVertex3f(3.0, 0.0, 3.0); 
     glVertex3f(3.0, 0.0, -1.0); 
     glEnd(); 

     // left 
     glMaterialfv(GL_FRONT, GL_EMISSION, black); 
     glMaterialfv(GL_BACK, GL_EMISSION, black); 
     glMaterialfv(GL_FRONT_AND_BACK, GL_AMBIENT_AND_DIFFUSE, red); 
     glBegin(GL_POLYGON); 
     glVertex3f(-3.0, 2.0, -1.0); 
     glVertex3f(-3.0, 2.0, 3.0); 
     glVertex3f(-3.0, 0.0, 3.0); 
     glVertex3f(-3.0, 0.0, -1.0); 
     glEnd(); 

     // buttom 
     glMaterialfv(GL_FRONT, GL_EMISSION, black); 
     glMaterialfv(GL_BACK, GL_EMISSION, black); 
     glMaterialfv(GL_FRONT_AND_BACK, GL_AMBIENT_AND_DIFFUSE, red); 
     glBegin(GL_POLYGON); 
     glVertex3f(-3.0, 0.0, -1.0); 
     glVertex3f(-3.0, 0.0, 3.0); 
     glVertex3f(3.0, 0.0, 3.0); 
     glVertex3f(3.0, 0.0, -1.0); 
     glEnd(); 


     glFlush(); 
     glutSwapBuffers(); 
} 


void keyboard(unsigned char key, int x, int y) 
{ 
     static int polygonmode[2]; 

     switch (key) { 
     case 27: 
       exit(0); 
       break; 

       /* open and close the top */ 
     case 'o': 
#if 0 
       if (step < 90) { stepBefore = step*1.0; step = step + 2; } 
#else 
       /* Modifications to your code */ 
       if (step < 360) { stepBefore = step*1.0; step = step + 2; } 
#endif 
       glutPostRedisplay(); 
       break; 
     case 'c': 
       if (step > 0) { 
         stepBefore = step*1.0; step = step - 2; 
       } 
       glutPostRedisplay(); 
       break; 
       /* w for switching between GL_FILL and GL_LINE 
       * Using a query command glGetIntegerv() we obtain two integers 
       * indicating the current GL_POLYGON_MODE for FRONT and BACK faces. 
       * Look up glIsEnabled() that may be found useful. */ 
     case 'w': 
       glGetIntegerv(GL_POLYGON_MODE, polygonmode); 
       if (polygonmode[0] == GL_FILL) 
         glPolygonMode(GL_FRONT_AND_BACK, GL_LINE); 
       else glPolygonMode(GL_FRONT_AND_BACK, GL_FILL); 
       glutPostRedisplay(); 
       break; 

       /* control lpos */ 
     case 'x': 
       lpos[0] = lpos[0] + 0.2; 
       glutPostRedisplay(); 
       break; 
     case 'X': 
       lpos[0] = lpos[0] - 0.2; 
       glutPostRedisplay(); 
       break; 
     case 'y': 
       lpos[1] = lpos[1] + 0.2; 
       glutPostRedisplay(); 
       break; 
     case 'Y': 
       lpos[1] = lpos[1] - 0.2; 
       glutPostRedisplay(); 
       break; 
     case 'z': 
       lpos[2] = lpos[2] + 0.2; 
       glutPostRedisplay(); 
       break; 
     case 'Z': 
       lpos[2] = lpos[2] - 0.2; 
       glutPostRedisplay(); 
       break; 

     default: 
       break; 
     } 
} 
void specialkey(GLint key, int x, int y) 
{ 
     switch (key) { 
     case GLUT_KEY_RIGHT: 
       alpha = alpha + PI/180; 
       if (alpha > 2 * PI) alpha = alpha - 2 * PI; 
       glutPostRedisplay(); 
       break; 
     case GLUT_KEY_LEFT: 
       alpha = alpha - PI/180; 
       if (alpha < 0) alpha = alpha + 2 * PI; 
       glutPostRedisplay(); 
       break; 
     case GLUT_KEY_UP: 
       if (beta < 0.45*PI) beta = beta + PI/180; 
       glutPostRedisplay(); 
       break; 
     case GLUT_KEY_DOWN: 
       if (beta > 0.05*PI) beta = beta - PI/180; 
       glutPostRedisplay(); 
       break; 

     default: 
       break; 
     } 
} 

int main(int argc, char** argv) 
{ 
     glutInit(&argc, argv); 
     glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGB | GLUT_DEPTH); 
     glutInitWindowSize(800, 800); 
     glutInitWindowPosition(100, 100); 
     glutCreateWindow(argv[0]); 
     init(); 
     glutDisplayFunc(display); 
     glutReshapeFunc(reshape); 
     glutKeyboardFunc(keyboard); 
     glutSpecialFunc(specialkey); 
     glutMainLoop(); 
     return 0; 
}

來源

2014-09-21 07:28:00 starrify

你真棒!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! – Apha 2014-09-21 07:33:07

天才........ – Apha 2014-09-21 07:33:31

@SeyedamirhosseinHesamian謝謝你，我真的很樂意提供幫助。 :) – starrify 2014-09-21 07:34:05

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