Simply imitating the role of stacks in OpenGL

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