/*

    File:       TSprite.cp

    Contains:   This implements a first cut at a standardized sprite class.  This is an

                abstract base class and all sprites must be subclassed off a TSprite.

    Written by: Timothy Carroll

    Copyright:  Copyright © 1996-1999 by Apple Computer, Inc., All Rights Reserved.

                You may incorporate this Apple sample source code into your program(s) without

                restriction. This Apple sample source code has been provided "AS IS" and the

                responsibility for its operation is yours. You are not permitted to redistribute

                this Apple sample source code as "Apple sample source code" after having made

                changes. If you're going to re-distribute the source, we require that you make

                it clear in the source that the code was descended from Apple sample source

                code, but that you've made changes.

    Change History (most recent first):

                7/2/1999    Karl Groethe    Updated for Metrowerks Codewarror Pro 2.1

                1/23/97     Timothy Carroll Added include for Moofwars.h so that MrC

                                            will compile

                8/15/96     Timothy Carroll Initial Release

*/

#include "Moofwars.h"

#include "TSprite.h"

#include "TSpriteCollection.h"

#include "DrawSprocket.h"

/*************************************************************************************

    Constructors and Destructors    

*************************************************************************************/

TSprite::TSprite (TSpriteData *data)

{

    fCoordX  = data->initialX;

    fCoordY  = data->initialY;

    fVelocityX = data->initialXVelocity;

    fVelocityY = data->initialYVelocity;

    fFace = data->face;

    fVisibility = data->visibility;

    fGroup = NULL;

    fNextSprite = fPrevSprite = NULL;

    if (data->preloadedCollection != NULL)

    {

        fSpriteImages = data->preloadedCollection;

        fSpriteImages->AddReference();

    }

    else

        fSpriteImages = TGraphicCollection::NewCollection (data->collectionID);

    fBounds = fSpriteImages->GetBounds(0);

    fXOffset = (fBounds.right - fBounds.left) >> 1;

    fYOffset = (fBounds.bottom - fBounds.top) >> 1;

}

TSprite::~TSprite (void)

{

    if (fSpriteImages)

        fSpriteImages->DisposeReference();

    fSpriteImages = NULL;

    RemoveFromGroup();

}

/*************************************************************************************

    Standard Accessor Functions

*************************************************************************************/

void            

TSprite::GetCurrentWorldLocation  (SInt32 *worldX, SInt32 *worldY)

{

    *worldX = fCoordX;

    *worldY = fCoordY;

}

void

TSprite::SetCurrentWorldLocation (SInt32 worldX, SInt32 worldY)

{

    fCoordX = worldX;

    fCoordY = worldY;

}

SInt32

TSprite::GetXVelocity()

{

    return fVelocityX;

}

SInt32

TSprite::GetYVelocity()

{

    return fVelocityY;

}

void

TSprite::SetXVelocity (SInt32 xVelocity)

{

    fVelocityX = xVelocity;

}

void

TSprite::SetYVelocity (SInt32 yVelocity)

{

    fVelocityY = yVelocity;

}

void

TSprite::DrawSprite (void)

{

    // calculate the top left corner of the current world coordinates given our scaling

    // information.  We pass this along to the TGraphic for the current scale.  It is considered

    // an error to draw in a scale that has no collection of graphics.

    if (fVisibility == kVisible)

    {

        // convert to QD coordinates

        SInt32              spriteH, spriteV;

#if qDebugging

        if (fSpriteImages == NULL)

        {

            DebugStr ("\pAttempted to draw with an invalid scale");

            return;

        }

#endif

// The ability to draw the sprite in different sizes is nice, but it might cause too much

// overhead.  Need to test this.

        spriteH = ((fCoordX - gWorldCoordX) >> 16) + gClipCenterX - fXOffset;

        spriteV = ((fCoordY - gWorldCoordY) >> 16) + gClipCenterY - fYOffset;

        fSpriteImages->CopyImage (fFace, spriteV, spriteH, kDrawGraphic);

    }

}

void

TSprite::Bounce (WorldRect32 *bounceBounds)

{

    SInt32 xOff = fXOffset << 16;

    SInt32 yOff = fYOffset << 16;

    if (((fCoordX-xOff < bounceBounds->left) && (fVelocityX < 0)) ||

        ((fCoordX+xOff > bounceBounds->right) && (fVelocityX > 0)))

    {

        fVelocityX = -fVelocityX;

        fCoordX += fVelocityX;

    }

    if (((fCoordY-yOff < bounceBounds->top) && (fVelocityY < 0)) ||

        ((fCoordY+yOff > bounceBounds->bottom) && (fVelocityY > 0)))

    {

        fVelocityY = -fVelocityY;

        fCoordY += fVelocityY;

    }

}

void

TSprite::Collision (TSprite *theSprite)

{

#pragma unused (theSprite)

    // by default we do nothing in a collision

}

/*************************************************************************************

    Routines that link up with the TSpriteCollection class.  Note that these routines should

    always be called.  Don't call the routines in the TSpriteCollection class, or things won't

    be updated properly.

*************************************************************************************/

void

TSprite::AddToGroup (TSpriteCollection *theGroup)

{

    // clear any existing group

    RemoveFromGroup();

    theGroup->AddSprite (this);

    fGroup = theGroup;

}

void

TSprite::RemoveFromGroup (void)

{

    if (fGroup != NULL)

    {

        fGroup->RemoveSprite(this);

        fGroup = NULL;

    }

}