DXA.CPP

/*========================================================================== 
 * 
 *  Copyright (C) 1995-1997 Microsoft Corporation. All Rights Reserved. 
 * 
 *  File:       dxa.cpp 
 * 
 *  This file contains functions that make use of DirectX Animation 
 *  to render animation to a ddraw surface. 
 * 
 ***************************************************************************/ 
 
#include "dxa.h" 
#include <stdio.h> 
#include <sys\timeb.h> 
#include <tchar.h> 
 
IDAViewPtr view1 = NULL; 
IDAViewPtr view2 = NULL; 
/* 
 * StartOle 
 * 
 * Start the Ole services. 
 */ 
struct StartOle { 
    StartOle() { CoInitialize( NULL ); } 
    ~StartOle() { CoUninitialize(); } 
} _inst_StartOle; 
 
/* 
 * dump_com_error 
 * 
 * Dump the com error should an exception occurs in InitDXAViewObj. 
 * This is mainly for debugging purpose. 
 */ 
void dump_com_error( _com_error &e ) 
{ 
    char buf[2048]; 
 
    sprintf(buf, _T( "Oops - hit an error!\n\tCode = %08lx\n\tCode meaning = %s\n" ), 
            e.Error(), e.ErrorMessage()); 
    OutputDebugString(buf); 
} 
 
/* 
 * initDXAViewObj 
 * 
 * Create the DAView object, construct the model, then start the model. 
 * 
 */ 
BOOL initDXAViewObj(IUnknown *ddsurf) 
{ 
    try { 
        IDAStaticsPtr e; 
 
        // Create the statics object. 
        e.CreateInstance(L"DirectAnimation.DAStatics"); 
 
        // Create the two DAView objects.  One will be rendered under 
        // the donut, the other above it. 
        view1.CreateInstance(L"DirectAnimation.DAView"); 
        view2.CreateInstance(L"DirectAnimation.DAView"); 
 
        // Construct the image for model1, which will be rendered 
        // under the donut.   
        IDAColorPtr col1 = e->ColorHslAnim(e->LocalTime, e->DANumber(0.5), 
                                                         e->DANumber(0.5)); 
        IDAFontStylePtr font = e->Font("Helvetica", 14, col1); 
        IDAImagePtr txtImg1 = e->StringImage("DXA Under Donut", font);        
        IDAImagePtr model1 = txtImg1->Transform(e->Rotate2Anim(e->LocalTime)); 
 
        // Tell the DAView object where to render the model. 
        view1->SetViewport(0, 0, WINDOW_WIDTH, WINDOW_HEIGHT); 
        view1->IDirectDrawSurface = ddsurf; 
        view1->CompositeDirectlyToTarget = TRUE; 
        view1->StartModel(e->Overlay(model1, e->SolidColorImage(e->Black)), e->Silence, 0); 
 
        // Construct the image for model2, which will be rendered 
        // above the donut.   
        IDAImagePtr txtImg2 = e->StringImage("DXA Above Donut", font);                 
        IDAImagePtr model2 = txtImg2->Transform(e->Translate2Anim( 
                                                e->DANumber(0),        
                                                e->Mul(e->Sin(e->LocalTime),  
                                                       e->DANumber(0.01)))); 
        
        
        view2->SetViewport(0, 0, WINDOW_WIDTH, WINDOW_HEIGHT); 
        view2->IDirectDrawSurface = ddsurf; 
        view2->CompositeDirectlyToTarget = TRUE; 
        view2->StartModel(model2, e->Silence, 0); 
    } catch (_com_error &e) { 
        dump_com_error( e ); 
        return false; 
    } 
    return true; 
} 
 
BOOL resetDXASurfaces(IUnknown *ddsurf) 
{ 
    try { 
        view1->IDirectDrawSurface = ddsurf; 
        view2->IDirectDrawSurface = ddsurf; 
    } catch (_com_error &e) { 
        dump_com_error( e ); 
        return false; 
    } 
    return true; 
} 
 
/* 
 * tick 
 * 
 * Ask DA to sample and display the model. 
 * 
 */ 
void tick(IDAViewPtr view) { 
    static double startTime = 0; 
    struct _timeb timebuffer; 
 
    if (view != NULL) { 
        _ftime( &timebuffer ); 
        double thisTime = timebuffer.time + ( timebuffer.millitm / 1000.0 ); 
 
        if ( startTime == 0 )  { 
            startTime = thisTime; 
            thisTime = 0; 
        } 
        else 
            thisTime -= startTime; 
 
        view->Tick(thisTime); 
        view->Render(); 
    } 
}