Working with the Camera - Essentials of Interactive Computer Graphics - page 393

class CDrawHandler : public UWBD3D _ WindowHandler {
public :
DrawGraphics(); // To draw the application window
protected :
// The application window in MFC

WBMFC _ UIWindow m _ Window;
To remind ourselves:
// the following are defined in the super classes:
// UWB _ WindowHandler and UWBD3D _ WindowHandler

A:

// This is the link to the D3D Device

Source file. Pseudocode; no
corresponding source file.

LPDIRECT3DDEVICE9 m _ pD3DDevice;
.
// The WC Window bounds

B:

UWB _ BoundingBox m _ WCWindow;
// Computes and Loads: M w 2 n to M V

C:

D: LoadW2NDCXForm( ... );

// Transform points from DC to WC
DeviceToWorld( ... );

}

CDrawHandler::DrawGraphics() {
.
// initialized to I 4

E:

D3DXMATRIX identity; D3DXMatrixIdentity(&identity);
// M W ←− I 4 (initialize OC to WC transform)
m _ pD3DDevice->SetTransform(D3DTS _ WORLD,&identity);
// M V ←− M w 2 n (WC to NDC)
LoadW2NDCXform();

// Clears the hardware buffer
m _ pD3DDevice->Clear( ... );
// draws the scene with models defined by SceneNode and Primitive

F:

theApp.GetModel().DrawModel();
.

}

Listing 15.1. The pseudocode of a typical 2D WindowHandler .