A Simple Graphics Program - Essentials of Interactive Computer Graphics - page 72

class CTutorialDlg : public CDialog {
.

Source file.
TutorialDlg.h/cpp file
in the Source and em-
phHeader folders of the
D3D _ Rectangles2D project.

// removed familiar content e.g., constructors etc.

CGrfxWindowD3D m _ GrfxWnd;

};

. // removed familiar content e.g., constructors etc.
BOOL CTutorialDlg::OnInitDialog() {
.
// Replaces IDC _ GRFX _ PLACEHOLDER on the application window
m _ GrfxWnd.ReplaceDialogControl(m _ hWnd, IDC _ GRFX _ PLACEHOLDER);
.

Listing 3.1. CTutorialDlg class (Tutorial 3.1).

GUI layout design process. Our program code creates this GUI element during
initialization of the main application window.

Back-End Programming Code

The development project consists of a total of nine source files (four .cpp and five
.h files). By now we are familiar with most of the source files, and we understand
the files that we will be working with are the following.

• CTutorialDlg.h/.cpp . As in all the tutorials in this topic, these two files
define the CTutorialDlg class, the data type that represents the main ap-
plication window. As we can see from Figure 3.6, the main application
window only contains a quit button (with default behavior) and a D3D Quit Button. Because the quit

button has the default behav-
ior, no special supported is re-
quired.

drawing area. Listing 3.1 shows that, as expected, CTutorialDlg only has
an instance of m _ GrfxWnd , the control variable to the D3D drawing area.
During the initialization of the application window (in OnInitDialog() ),
m _ GrfxWnd replaces itself into the IDC _ GRFX _ PLACEHOLDER position on the
application window.

• GrfxWindowD3D.h/.cpp . These two files define the CGrfxWindowD3D
class, the data type that represents the D3D drawing area.

Listing 3.2

shows part of the definition of the CGrfxWndD3D class. We see that the