Isometric Game Programming with DirectX 7.0/Isometric Game Programming.iso/source/chapter16/isohex16_1/isomousemap.cpp

C/C++ Source or Header | 2000-08-07 | 5KB | 279 lines

//IsoMouseMap.cpp
#include "IsoMouseMap.h"
#include "GDICanvas.h"

//constructor
CMouseMap::CMouseMap()
{
    //set defaults
    //scroller
    SetScroller(NULL);

    //walker
    SetTileWalker(NULL);

    //initialize mousemap to zeros
    mmdLookUp=NULL;
    iWidth=0;
    iHeight=0;

    //mousemap
    Create(1,1);

    //reference point
    ptRef.x=0;
    ptRef.y=0;
}

//destructor
CMouseMap::~CMouseMap()
{
    //destroy the lookup table
    Destroy();
}

//load mousemap
void CMouseMap::Load(LPCTSTR lpszFileName)
{
    //gdi canvas
    CGDICanvas gdic;

    //load in graphic
    gdic.Load(NULL,lpszFileName);

    //create mousemap
    Create(gdic.GetWidth(),gdic.GetHeight());

    //grab corner points
    COLORREF crNE=GetPixel(gdic,iWidth-1,0);
    COLORREF crNW=GetPixel(gdic,0,0);
    COLORREF crSE=GetPixel(gdic,iWidth-1,iHeight-1);
    COLORREF crSW=GetPixel(gdic,0,iHeight-1);

    //test point
    COLORREF crTest;

    //fill in lookup
    for(int x=0;x<iWidth;x++)
    {
        for(int y=0;y<iHeight;y++)
        {
            //grab pixel
            crTest=GetPixel(gdic,x,y);

            //check against corner points
            if(crTest==crNE) mmdLookUp[x+y*iWidth]=MM_NE;
            if(crTest==crSE) mmdLookUp[x+y*iWidth]=MM_SE;
            if(crTest==crNW) mmdLookUp[x+y*iWidth]=MM_NW;
            if(crTest==crSW) mmdLookUp[x+y*iWidth]=MM_SW;
        }
    }
}

//create a blank mousemap
void CMouseMap::Create(int iWidth,int iHeight)
{
    //destroy any old lookup table
    Destroy();

    //copy size
    this->iWidth=iWidth;
    this->iHeight=iHeight;

    //allocate buffer
    mmdLookUp=new MOUSEMAPDIRECTION[iWidth*iHeight];

    //clear out buffer
    for(int count=0;count<iWidth*iHeight;count++)
    {
        mmdLookUp[count]=MM_CENTER;
    }
}

//destroy mousemap
void CMouseMap::Destroy()
{
    //if allocated, deallocate
    if(mmdLookUp)
    {
        delete[] mmdLookUp;
        iWidth=0;
        iHeight=0;
    }
}

//width/height
int CMouseMap::GetWidth()
{
    //return width
    return(iWidth);
}

int CMouseMap::GetHeight()
{
    //return height
    return(iHeight);
}

//reference
//get the reference point
POINT* CMouseMap::GetReferencePoint()
{
    //return point
    return(&ptRef);
}

//set the reference point
void CMouseMap::SetReferencePoint(POINT* pptRefPt)
{
    //set new reference point
    ptRef.x=pptRefPt->x;
    ptRef.y=pptRefPt->y;
}

//calculate the reference point based on a tile plotter and an extent rect
void CMouseMap::CalcReferencePoint(CTilePlotter* pTilePlotter,RECT* prcExtent)
{
    //map point
    POINT ptMap;
    ptMap.x=0;
    ptMap.y=0;

    //plotted point
    ptRef=pTilePlotter->PlotTile(ptMap);

    //adjust ptRef by left and top of extent rect
    ptRef.x+=prcExtent->left;
    ptRef.y+=prcExtent->top;
}

//map the mouse
POINT CMouseMap::MapMouse(POINT ptMouse)
{
    //convert to world coordinates from screen coordinates
    //check for a scroller. if there is no scroller, then assume screen coordinates are the same as world coordinates
    if(pScroller)
    {
        //convert from screen to world
        ptMouse=pScroller->ScreenToWorld(ptMouse);
    }

    //subtract reference point
    ptMouse.x-=ptRef.x;
    ptMouse.y-=ptRef.y;

    //convert to mousemap coordinates
    POINT ptMouseMapCoarse;
    POINT ptMouseMapFine;

    //coarse coordinates
    ptMouseMapCoarse.x=ptMouse.x/GetWidth();
    ptMouseMapCoarse.y=ptMouse.y/GetHeight();

    //fine coordinates
    ptMouseMapFine.x=ptMouse.x%GetWidth();
    ptMouseMapFine.y=ptMouse.y%GetHeight();

    //adjust for negative fine coordinates
    if(ptMouseMapFine.x<0)
    {
        ptMouseMapFine.x+=iWidth;
        ptMouseMapCoarse.x--;
    }
    if(ptMouseMapFine.y<0)
    {
        ptMouseMapFine.y+=iHeight;
        ptMouseMapCoarse.y--;
    }

    //check for a tile walker. if there is no tile walker, convert from coarse coordinates directly into map coordinates
    POINT ptMap;
    ptMap.x=0;
    ptMap.y=0;
    if(pTileWalker)
    {
        //coarse tilewalk
        //north
        while(ptMouseMapCoarse.y<0)
        {
            ptMap=pTileWalker->TileWalk(ptMap,ISO_NORTH);
            ptMouseMapCoarse.y++;
        }
        //east
        while(ptMouseMapCoarse.x>0)
        {
            ptMap=pTileWalker->TileWalk(ptMap,ISO_EAST);
            ptMouseMapCoarse.x--;
        }
        //south
        while(ptMouseMapCoarse.y>0)
        {
            ptMap=pTileWalker->TileWalk(ptMap,ISO_SOUTH);
            ptMouseMapCoarse.y--;
        }
        //west
        while(ptMouseMapCoarse.x<0)
        {
            ptMap=pTileWalker->TileWalk(ptMap,ISO_WEST);
            ptMouseMapCoarse.x++;
        }
        //fine tilewalk
        switch(mmdLookUp[ptMouseMapFine.x+ptMouseMapFine.y*GetWidth()])
        {
        case MM_NE:
            {
                ptMap=pTileWalker->TileWalk(ptMap,ISO_NORTHEAST);
            }break;
        case MM_SE:
            {
                ptMap=pTileWalker->TileWalk(ptMap,ISO_SOUTHEAST);
            }break;
        case MM_SW:
            {
                ptMap=pTileWalker->TileWalk(ptMap,ISO_SOUTHWEST);
            }break;
        case MM_NW:
            {
                ptMap=pTileWalker->TileWalk(ptMap,ISO_NORTHWEST);
            }break;
        }
    }
    else
    {
        //coarse coordinates are map coordinates
        ptMap=ptMouseMapCoarse;
    }
    //return map coordinate
    return(ptMap);
}

//scroller
//get the scroller
CScroller* CMouseMap::GetScroller()
{
    //return the scroller
    return(pScroller);
}

//set the scroller
void CMouseMap::SetScroller(CScroller* pScroller)
{
    //set the scroller
    this->pScroller=pScroller;
}

//walker
//get the tile walker
CTileWalker* CMouseMap::GetTileWalker()
{
    //return walker
    return(pTileWalker);
}

//set the tile walker
void CMouseMap::SetTileWalker(CTileWalker* pTileWalker)
{
    //set the tile walker
    this->pTileWalker=pTileWalker;
}