مساعدة في تغيير محور الدوران

السلام عليكم و رحمة الله

ارجو المساعدة في هذا الكود

كيف اغير  محور الدوران بالنسبة للمثلث لاجعله حول المربع

اقتباس

 

/*

 NeHe (nehe.gamedev.net) OpenGL tutorial series

 GLUT port.in 2001 by milix (milix_gr@hotmail.com)

 Most comments are from the original tutorials found in NeHe.

 For VC++ users, create a Win32 Console project and link 

 the program with glut32.lib, glu32.lib, opengl32.lib

*/

 

#include <windows.h>    // Standard Header For MSWindows Applications

#include <gl/glut.h>    // The GL Utility Toolkit (GLUT) Header

 

// The Following Directive Fixes The Problem With Extra Console Window

#pragma comment(linker, "/subsystem:\"windows\" /entry:\"mainCRTStartup\"")

 

// Global Variables

bool    g_gamemode;     // GLUT GameMode ON/OFF

bool    g_fullscreen;   // Fullscreen Mode ON/OFF (When g_gamemode Is OFF)

GLfloat g_rtri = 0.0f;  // Angle For The Triangle 

GLfloat g_rquad = 0.0f; // Angle For The Quad 

 

// Our GL Specific Initializations

bool init(void)

{

    glShadeModel(GL_SMOOTH); // Enable Smooth Shading

    glClearColor(0.0f, 0.0f, 0.0f, 0.5f); // Black Background

    glClearDepth(1.0f); // Depth Buffer Setup

    glEnable(GL_DEPTH_TEST); // Enables Depth Testing

    glDepthFunc(GL_LEQUAL); // The Type Of Depth Testing To Do

    glEnable(GL_COLOR_MATERIAL);                        // Enable Color Tracking

    glHint(GL_PERSPECTIVE_CORRECTION_HINT, GL_NICEST);

return true;

}

 

// Our Rendering Is Done Here

void render(void)   

{

glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); // Clear Screen And Depth Buffer

glLoadIdentity(); // Reset The Current Modelview Matrix

    glPushMatrix();                                     // Save Current Modelview Matrix

glTranslatef(-1.5f,0.0f,-6.0f); // Move Left 1.5 Units And Into The Screen 6.0

glRotatef(g_rtri,0.0f,1.0f,0.0f); // Rotate The Triangle On The Y Axis

glBegin(GL_TRIANGLES); // Start Drawing A Triangle

glColor3f(1.0f,0.0f,0.0f); // Red

glVertex3f( 0.0f, 1.0f, 0.0f); // Top Of Triangle (Front)

glColor3f(0.0f,1.0f,0.0f); // Green

glVertex3f(-1.0f,-1.0f, 1.0f); // Left Of Triangle (Front)

glColor3f(0.0f,0.0f,1.0f); // Blue

glVertex3f( 1.0f,-1.0f, 1.0f); // Right Of Triangle (Front)

glColor3f(1.0f,0.0f,0.0f); // Red

glVertex3f( 0.0f, 1.0f, 0.0f); // Top Of Triangle (Right)

glColor3f(0.0f,0.0f,1.0f); // Blue

glVertex3f( 1.0f,-1.0f, 1.0f); // Left Of Triangle (Right)

glColor3f(0.0f,1.0f,0.0f); // Green

glVertex3f( 1.0f,-1.0f, -1.0f); // Right Of Triangle (Right)

glColor3f(1.0f,0.0f,0.0f); // Red

glVertex3f( 0.0f, 1.0f, 0.0f); // Top Of Triangle (Back)

glColor3f(0.0f,1.0f,0.0f); // Green

glVertex3f( 1.0f,-1.0f, -1.0f); // Left Of Triangle (Back)

glColor3f(0.0f,0.0f,1.0f); // Blue

glVertex3f(-1.0f,-1.0f, -1.0f); // Right Of Triangle (Back)

glColor3f(1.0f,0.0f,0.0f); // Red

glVertex3f( 0.0f, 1.0f, 0.0f); // Top Of Triangle (Left)

glColor3f(0.0f,0.0f,1.0f); // Blue

glVertex3f(-1.0f,-1.0f,-1.0f); // Left Of Triangle (Left)

glColor3f(0.0f,1.0f,0.0f); // Green

glVertex3f(-1.0f,-1.0f, 1.0f); // Right Of Triangle (Left)

glEnd(); // Done Drawing The Pyramid

    glPopMatrix();                                      // Restore Modelview Matrix 

glTranslatef(1.5f,0.0f,-7.0f); // Move Right 1.5 Units And Into The Screen 7.0

glRotatef(g_rquad,1.0f,0.0f,0.0f); // Rotate The Quad On The X Axis 

glBegin(GL_QUADS); // Draw A Quad

glColor3f(0.0f,1.0f,0.0f); // Set The Color To Blue

glVertex3f( 1.0f, 1.0f,-1.0f); // Top Right Of The Quad (Top)

glVertex3f(-1.0f, 1.0f,-1.0f); // Top Left Of The Quad (Top)

glVertex3f(-1.0f, 1.0f, 1.0f); // Bottom Left Of The Quad (Top)

glVertex3f( 1.0f, 1.0f, 1.0f); // Bottom Right Of The Quad (Top)

glColor3f(1.0f,0.5f,0.0f); // Set The Color To Orange

glVertex3f( 1.0f,-1.0f, 1.0f); // Top Right Of The Quad (Bottom)

glVertex3f(-1.0f,-1.0f, 1.0f); // Top Left Of The Quad (Bottom)

glVertex3f(-1.0f,-1.0f,-1.0f); // Bottom Left Of The Quad (Bottom)

glVertex3f( 1.0f,-1.0f,-1.0f); // Bottom Right Of The Quad (Bottom)

glColor3f(1.0f,0.0f,0.0f); // Set The Color To Red

glVertex3f( 1.0f, 1.0f, 1.0f); // Top Right Of The Quad (Front)

glVertex3f(-1.0f, 1.0f, 1.0f); // Top Left Of The Quad (Front)

glVertex3f(-1.0f,-1.0f, 1.0f); // Bottom Left Of The Quad (Front)

glVertex3f( 1.0f,-1.0f, 1.0f); // Bottom Right Of The Quad (Front)

glColor3f(1.0f,1.0f,0.0f); // Set The Color To Yellow

glVertex3f( 1.0f,-1.0f,-1.0f); // Top Right Of The Quad (Back)

glVertex3f(-1.0f,-1.0f,-1.0f); // Top Left Of The Quad (Back)

glVertex3f(-1.0f, 1.0f,-1.0f); // Bottom Left Of The Quad (Back)

glVertex3f( 1.0f, 1.0f,-1.0f); // Bottom Right Of The Quad (Back)

glColor3f(0.0f,0.0f,1.0f); // Set The Color To Blue

glVertex3f(-1.0f, 1.0f, 1.0f); // Top Right Of The Quad (Left)

glVertex3f(-1.0f, 1.0f,-1.0f); // Top Left Of The Quad (Left)

glVertex3f(-1.0f,-1.0f,-1.0f); // Bottom Left Of The Quad (Left)

glVertex3f(-1.0f,-1.0f, 1.0f); // Bottom Right Of The Quad (Left)

glColor3f(1.0f,0.0f,1.0f); // Set The Color To Violet

glVertex3f( 1.0f, 1.0f,-1.0f); // Top Right Of The Quad (Right)

glVertex3f( 1.0f, 1.0f, 1.0f); // Top Left Of The Quad (Right)

glVertex3f( 1.0f,-1.0f, 1.0f); // Bottom Left Of The Quad (Right)

glVertex3f( 1.0f,-1.0f,-1.0f); // Bottom Right Of The Quad (Right)

glEnd(); // Done Drawing The Quad

 

g_rtri += 0.2f; // Increase The Rotation For The Triangle (NEW)

g_rquad -= 0.15f;                                // Decrease The Rotation For The Quad (NEW)  

 

    // Swap The Buffers To Become Our Rendering Visible

    glutSwapBuffers( );

}

 

// Our Reshaping Handler (Required Even In Fullscreen-Only Modes)

void reshape(int w, int h)

{

glViewport(0, 0, w, h);

glMatrixMode(GL_PROJECTION);     // Select The Projection Matrix

glLoadIdentity();                // Reset The Projection Matrix

// Calculate The Aspect Ratio And Set The Clipping Volume

if (h == 0) h = 1;

gluPerspective(80, (float)w/(float)h, 1.0, 5000.0);

glMatrixMode(GL_MODELVIEW);      // Select The Modelview Matrix

glLoadIdentity();                // Reset The Modelview Matrix

}

 

// Our Keyboard Handler (Normal Keys)

void keyboard(unsigned char key, int x, int y)

{

switch (key) {

case 27:        // When Escape Is Pressed...

exit(0);    // Exit The Program

break;          // Ready For Next Case

default:        // Now Wrap It Up

break;

}

}

 

// Our Keyboard Handler For Special Keys (Like Arrow Keys And Function Keys)

void special_keys(int a_keys, int x, int y)

{

switch (a_keys) {

case GLUT_KEY_F1:

// We Can Switch Between Windowed Mode And Fullscreen Mode Only

if (!g_gamemode) {

g_fullscreen = !g_fullscreen;       // Toggle g_fullscreen Flag

if (g_fullscreen) glutFullScreen(); // We Went In Fullscreen Mode

else glutReshapeWindow(500, 500);   // We Went In Windowed Mode

}

break;

default:

break;

}

}

 

// Ask The User If He Wish To Enter GameMode Or Not

void ask_gamemode()

{

int answer;

// Use Windows MessageBox To Ask The User For Game Or Windowed Mode

answer = MessageBox(NULL, "Do you want to enter game mode?", "Question",

MB_ICONQUESTION | MB_YESNO);

g_gamemode = (answer == IDYES);

// If Not Game Mode Selected, Use Windowed Mode (User Can Change That With F1)

g_fullscreen = false; 

}

 

// Main Function For Bringing It All Together.

int main(int argc, char** argv)

{

ask_gamemode();                                  // Ask For Fullscreen Mode

glutInit(&argc, argv);                           // GLUT Initializtion

glutInitDisplayMode(GLUT_DEPTH | GLUT_RGB | GLUT_DOUBLE); // (CHANGED)

if (g_gamemode) {

glutGameModeString("640x480:16");            // Select The 640x480 In 16bpp Mode

if (glutGameModeGet(GLUT_GAME_MODE_POSSIBLE))

glutEnterGameMode();                     // Enter Full Screen

else g_gamemode = false;                     // Cannot Enter Game Mode, Switch To Windowed

}

if (!g_gamemode) {

glutInitWindowSize(500, 500);                // Window Size If We Start In Windowed Mode

glutCreateWindow("NeHe's OpenGL Framework"); // Window Title 

}

init();                                          // Our Initialization

glutDisplayFunc(render);                         // Register The Display Function

glutReshapeFunc(reshape);                        // Register The Reshape Handler

glutKeyboardFunc(keyboard);                      // Register The Keyboard Handler

glutSpecialFunc(special_keys);                   // Register Special Keys Handler

glutIdleFunc(render);                            // We Render In Idle Time

glutMainLoop();                                  // Go To GLUT Main Loop

return 0;

}