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FRESERVE
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BALL.H
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1997-01-04
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/*+==========================================================================
File: BALL.H
Summary: Include file for the aggregatable COBall COM object class.
COBall offers a main standard IUnknown interface (basic COM
object features) and the custom IBall interface (moving
ball-related features). This multiple interface COM Object
Class is achieved via the technique of nested classes. The
implementation of the IBall interface is nested inside of the
COBall Class.
This file also declares some internal C++ classes (CXForm and
CBallThread) that provide internal support for the custom
IBall interface.
For a comprehensive tutorial code tour of this module's
contents and offerings see the tutorial FRESERVE.HTM file.
For more specific technical details on the internal workings
see the comments dispersed throughout the module's source code.
Functions:
Classes: CXForm, CBallThread, COBall.
Origin: 4-5-96: atrent - Editor-inheritance from CAR.H in
the DLLSERVE Tutorial Code Sample. Also borrows from
the GDIDEMO sample in the Win32 samples of the Win32 SDK.
----------------------------------------------------------------------------
This file is part of the Microsoft ActiveX Tutorial Code Samples.
Copyright (C) Microsoft Corporation, 1997. All rights reserved.
This source code is intended only as a supplement to Microsoft
Development Tools and/or on-line documentation. See these other
materials for detailed information regarding Microsoft code samples.
THIS CODE AND INFORMATION IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY
KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND/OR FITNESS FOR A
PARTICULAR PURPOSE.
==========================================================================+*/
#if !defined(BALL_H)
#define BALL_H
#ifdef __cplusplus
enum { MAX_BALLTHREADS = 64, BALL_MOVE_SKEW = 5 };
/*C+C+++C+++C+++C+++C+++C+++C+++C+++C+++C+++C+++C+++C+++C+++C+++C+++C+++C+++C
Class: CXForm
Summary: A utility class with methods for performing point
transformations on points that represent space/location in two
dimensions.
Methods: Clear
Clears the transformation matrix.
Scale
Set transformation to multiply by a scale factor.
Trans
Perform transformation.
Point
Get point.
CXForm
Constructor.
~CXForm
Destructor.
C---C---C---C---C---C---C---C---C---C---C---C---C---C---C---C---C---C---C-C*/
class CXForm
{
private:
int XForm[3][3];
public:
CXForm(void) {};
~CXForm(void) {};
void Clear(void);
void Scale(int xScale, int yScale);
void Trans(int xTrans, int yTrans);
void Point(POINT* pPoint);
};
/*C+C+++C+++C+++C+++C+++C+++C+++C+++C+++C+++C+++C+++C+++C+++C+++C+++C+++C+++C
Class: CBallThread
Summary: A class for simple objects used to store properties of threads.
An array of these is used to remember the threads that came
visiting the CBall object.
Methods: CBallThread
Constructor.
~CBallThread
Destructor.
C---C---C---C---C---C---C---C---C---C---C---C---C---C---C---C---C---C---C-C*/
class CBallThread
{
public:
DWORD Id;
COLORREF Color;
CBallThread(void) {};
~CBallThread(void) {};
};
/*O+O+++O+++O+++O+++O+++O+++O+++O+++O+++O+++O+++O+++O+++O+++O+++O+++O+++O+++O
ObjectClass: COBall
Summary: COM object class for COBall COM objects. COM objects of
this class offer IBall interface features, Reset, Move, and
GetBall. The mulitple interfaces on this COM object are
constructed via the nested interface classes technique.
Interfaces: IUnknown
Standard interface providing COM object features.
IBall
Basic Ball operation features.
Aggregation: Yes, COBall COM Objects are aggregatable by passing
a non-NULL pUnkOuter IUnknown pointer into the constructor.
O---O---O---O---O---O---O---O---O---O---O---O---O---O---O---O---O---O---O-O*/
class COBall : public IUnknown, public CThreaded
{
public:
// Main Object Constructor & Destructor.
COBall(IUnknown* pUnkOuter, CServer* pServer);
~COBall(void);
// IUnknown methods. Main object, non-delegating.
STDMETHODIMP QueryInterface(REFIID, PPVOID);
STDMETHODIMP_(ULONG) AddRef(void);
STDMETHODIMP_(ULONG) Release(void);
private:
// We declare nested class interface implementations here.
class CImpIBall : public IBall, public CThreaded
{
public:
// Interface Implementation Constructor & Destructor.
CImpIBall(COBall* pBackObj, IUnknown* pUnkOuter);
~CImpIBall(void);
// IUnknown methods.
STDMETHODIMP QueryInterface(REFIID, PPVOID);
STDMETHODIMP_(ULONG) AddRef(void);
STDMETHODIMP_(ULONG) Release(void);
// IBall methods.
STDMETHODIMP Reset(RECT* pNewRect, short nBallSize);
STDMETHODIMP GetBall(POINT* pOrg, POINT* pExt, COLORREF* pcrColor);
STDMETHODIMP Move(BOOL bAlive);
private:
// Data private to this COBall interface implementation of IBall.
COBall* m_pBackObj; // Parent Object back pointer.
IUnknown* m_pUnkOuter; // Outer unknown for Delegation.
// The following private data and methods constitute the working
// heart of COBall as an actual application object.
BOOL m_bAlive;
RECT m_WinRect;
int m_nWidth;
int m_nHeight;
int m_xDirection;
int m_yDirection;
BOOL m_bNewPosition;
int m_xPosition;
int m_yPosition;
short m_xSkew;
short m_ySkew;
COLORREF m_crColor;
CXForm m_XForm;
CBallThread m_aBallThreads[MAX_BALLTHREADS];
// Private methods for internal use.
void GetDimensions(POINT*);
void SetDimensions(int,int);
void GetDirection(POINT*);
void SetDirection(int,int);
void GetPosition(POINT*);
void SetPosition(int,int);
void CheckBounce(void);
void FindThread(void);
};
// Make the otherwise private and nested IBall interface implementation
// a friend to COM object instantiations of this selfsame COBall
// COM object class.
friend CImpIBall;
// Private data of COBall COM objects.
// Nested IBall implementation instantiation. This IBall interface
// is instantiated inside this COBall object as a native interface.
CImpIBall m_ImpIBall;
// Main Object reference count.
ULONG m_cRefs;
// Outer unknown (aggregation & delegation).
IUnknown* m_pUnkOuter;
// Pointer to this component server's control object.
CServer* m_pServer;
};
typedef COBall* PCOBall;
#endif // __cplusplus
#endif // BALL_H