# Simply imitating the role of stacks in OpenGL

Source: Internet
Author: User

The role of the stack in OpenGL is to save the current matrix.

Pushmatrix ()

Declare the 3D coordinate changes in the graphics:

In OpenGL, the current matrix (including projection matrix, transformation matrix, and so on) is saved under the coordinate change process.CodeIt simply imitates the storage and restoration of the matrix.

Code: (I have applied the stack data structure in STL. Please follow the instructions for self-implementation)

` 1 # Include "  Stdafx. h  "  2 # Include <iostream> 3 # Include <stack> 4 # Include "  Windows. h "  5   Using   Namespace  STD;  6   /*  **************************************** ******************************  */  7   /*  The simulation of stack operations in OpenGL simply simulates the operations of the world coordinate system.  8   Where: press the stack to save the current matrix transformation  9  In this example, initfunc () is used to simulate the initialization transformfunc () to represent the coordinate transformation.  */  10   /*  **************************************** ******************************  */  11   12   Struct  Vector3f {  13   14       Float X, Y, Z; //  Coordinates x, y, z 15   };  16   17 Vector3f currentvector; //  The global coordinate representation is used to represent the world coordinates (global)  18 Stack <vector3f> Savevectorstatic;  19   //  Initialization Function  20   Void  Showvector ();  21   Void Initfunc ()  22   {  23 Currentvector. x = 0  ;  24 Currentvector. Y = 0  ;  25 Currentvector. z = 0  ;  26   }  27   // Transform Functions  28   Void Transformfunc ( Float X, Float Y, Float  Z)  29   {  30 Currentvector. x = currentvector. x + X;  31 Currentvector. Y = currentvector. Y + Y;  32 Currentvector. z = currentvector. Z +Z;  33   }  34   35   Int _ Tmain ( Int Argc, _ tchar * Argv [])  36   {  37   Initfunc ();  38 Cout < "  I want to see the current coordinates:  " <Endl;  39   Showvector ();  40   41 Cout < "  I want to Pan 6 units up and save the current Matrix !!  " < Endl;  42 Cout < "  Execute: "savevectorstatic. Push (currentvector); To save !"  " < Endl;  43 Cout < "  Run "transformfunc (0.0f, 6.0f, 0.0f);" to move it!  " < Endl;  44   Savevectorstatic. Push (currentvector );  45 Transformfunc ( 0.0f , 6.0f , 0.0f  );  46   47 Cout < " I want to see the current coordinates:  " < Endl;  48   Showvector ();  49   50 Cout < "  I want to move 3 units to the left based on the origin !!  " < Endl;  51 Currentvector = Savevectorstatic. Top ();  52 Transformfunc (3.0f , 0.0f , 0.0f  );  53   54 Cout < "  Run "currentvector = savevectorstatic. Top ();" to restore the instance!  " < Endl;  55 Cout < "  Run "transformfunc (3.0f, 0.0f, 0.0f);" to move it!  " <Endl;  56   57   58   59 Cout < "  I want to see the current coordinates:  " < Endl;  60   Showvector ();  61       Return   0  ;  62   } 63   Void  Showvector ()  64   {  65 Cout < "  Number of elements in the current stack:  " <Savevectorstatic. Size () < Endl;  66 Cout < "  Coordinates:  " < " X  " < "  Y  " < "  Z  " < Endl;  67 Cout < "         " <Currentvector. x < "      " <Currentvector. Y < "    " <Currentvector. z < Endl;  68 }`

Original connection :( we create a forum): http://bochuang.sinaapp.com/forum.php? MoD = viewthread & tid = 55

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