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Full Screen GUI Development
Pt 1 ?The Basics
By Jim (Machaira) Perry
In this article we抣l look at developing a GUI for full-screen DirectX games. The code accompanying this article may be used as a base for developing your own GUI class. It will necessarily be simplistic, but may give you an idea of how to go about writing your own GUI code.
This article assumes a working knowledge of DirectX 7 and VB classes.
Download this tutorial (in Word format) and the sample projects in a zip file (336 KB)
When you think of a GUI you think in terms of windows, so the base class will handle most normal window properties and draw the bitmap used to represent the window. A bitmap for a simple window could look like the following.
This window has no Control Box or minimize, maximize, and close buttons. It抯 about as simple as you can get. See the window.bmp file.
Several example of more complex GUI抯 are below:
Figure 1 - Quake III Arena GUI
Figure 2 - Unreal Tournament GUI
Our GUI class won抰 quite be up to the task of handling something like this, but it抣l eventually be pretty useful.
Below is a first try at a base window class (see the WindowSample1 project):
ClsWindow Class
Option Explicit
Private objBitmap As DirectDrawSurface7
Private iX As Integer
Private iY As Integer
Private iWidth As Integer
Private iHeight As Integer
''''Center the window against the parent window
''''For a base window the parent is the screen
Private bCenterX As Boolean
Private bCenterY As Boolean
''''Used for centering purposes
Private iParentWidth As Integer
Private iParentHeight As Integer
Private iParentX As Integer
Private iParentY As Integer
Public Property Let X(ByVal iData As Integer)
iX = iData
End Property
Public Property Get X() As Integer
X = iX
End Property
Public Property Let Y(ByVal iData As Integer)
iY = iData
End Property
Public Property Get Y() As Integer
Y = iY
End Property
''''Only Property Get for Width and Height properties
''''since they are set by the dimensions of the bitmap
Public Property Get Width() As Integer
Width = iWidth
End Property
Public Property Get Height() As Integer
Height = iHeight
End Property
Public Property Let CenterX(ByVal bData As Boolean)
bCenterX = bData
iX = ((iParentWidth / 2) + iParentX) - (iWidth / 2)
End Property
Public Property Get CenterX() As Boolean
CenterX = bCenterX
End Property
Public Property Let CenterY(ByVal bData As Boolean)
bCenterY = bData
iY = ((iParentHeight / 2) + iParentY) - (iHeight / 2)
End Property
Public Property Get CenterY() As Boolean
CenterY = bCenterY
End Property
Public Property Let ParentWidth(ByVal iData As Integer)
iParentWidth = iData
End Property
Public Property Get ParentWidth() As Integer
ParentWidth = iParentWidth
End Property
Public Property Let ParentHeight(ByVal iData As Integer)
iParentHeight = iData
End Property
Public Property Get ParentHeight() As Integer
ParentHeight = iParentHeight
End Property
Public Property Let ParentX(ByVal iData As Integer)
iParentX = iData
End Property
Public Property Get ParentX() As Integer
ParentX = iParentX
End Property
Public Property Let ParentY(ByVal iData As Integer)
iParentY = iData
End Property
Public Property Get ParentY() As Integer
ParentY = iParentY
End Property
Public Property Let ObjectSurface(ByVal objSurface As DirectDrawSurface7)
Dim ddsd As DDSURFACEDESC2
Set objBitmap = objSurface
objBitmap.GetSurfaceDesc ddsd
iHeight = ddsd.lHeight
iWidth = ddsd.lWidth
End Property
Public Function DrawObject(objSurface As DirectDrawSurface7)
Dim rectObject As RECT
Dim rectBitmap As RECT
On Error GoTo DrawObjectErr
rectBitmap.Left = iX
rectBitmap.Right = iX + iWidth
rectBitmap.Top = iY
rectBitmap.Bottom = iY + iHeight
objSurface.Blt rectBitmap, objBitmap, rectObject, DDBLT_WAIT
Exit Function
DrawObjectErr:
Exit Function
End Function
Take a look at the InitDD function in the modDirectDraw module. The following code creates the window object:
Window.ObjectSurface = objDD.CreateSurfaceFromFile(App.Path & "\window.bmp", ddsdSurf2)
Window.ParentX = 0
Window.ParentY = 0
Window.ParentHeight = 600
Window.ParentWidth = 800
Window.CenterX = True
Window.CenterY = True
This will simply draw a bitmap of a window centered on the screen. It doesn抰 handle input and contains no controls. Although this is a good start it doesn抰 really offer us much. [1] [2] [3] 下一页
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