Isometric Game Programming with DirectX 7.0/Isometric Game Programming.iso/source/chapter18/isohex18_3/isoscroller.cpp

C/C++ Source or Header | 2000-07-28 | 8.1 KB | 364 lines

//isoscroller.cpp
#include "IsoScroller.h"

//constructor
CScroller::CScroller()
{
    //set all spaces to empty
    SetRectEmpty(&rcWorldSpace);
    SetRectEmpty(&rcScreenSpace);
    SetRectEmpty(&rcAnchorSpace);

    //set screen anchor to 0,0
    ptScreenAnchor.x=0;
    ptScreenAnchor.y=0;

    //set wrapping modes to none
    SetHWrapMode(WRAPMODE_NONE);
    SetVWrapMode(WRAPMODE_NONE);
}

//destructor
CScroller::~CScroller()
{
}

//screen space
//get screenspace
RECT* CScroller::GetScreenSpace()
{
    //return pointer to rect
    return(&rcScreenSpace);
}

//set screenspace
void CScroller::SetScreenSpace(RECT* prcNewScreenSpace)
{
    //copy rectangle
    CopyRect(&rcScreenSpace,prcNewScreenSpace);
}

//change screenspace
void CScroller::AdjustScreenSpace(int iLeftAdjust,int iTopAdjust,int iRightAdjust, int iBottomAdjust)
{
    //adjust left
    rcScreenSpace.left+=iLeftAdjust;
    //adjust top
    rcScreenSpace.top+=iTopAdjust;
    //adjust right
    rcScreenSpace.right+=iRightAdjust;
    //adjust bottom
    rcScreenSpace.bottom+=iBottomAdjust;
}

//retrieve width of screenspace
int CScroller::GetScreenSpaceWidth()
{
    //return width of rect
    return(rcScreenSpace.right-rcScreenSpace.left);
}

//retrieve height of screenspace
int CScroller::GetScreenSpaceHeight()
{
    //return height of rect
    return(rcScreenSpace.bottom-rcScreenSpace.top);
}

//world space
//get worldspace
RECT* CScroller::GetWorldSpace()
{
    //return pointer to rect
    return(&rcWorldSpace);
}

//set worldspace
void CScroller::SetWorldSpace(RECT* prcNewWorldSpace)
{
    //copy rectangle
    CopyRect(&rcWorldSpace,prcNewWorldSpace);
}

//change worldspace
void CScroller::AdjustWorldSpace(int iLeftAdjust,int iTopAdjust,int iRightAdjust, int iBottomAdjust)
{
    //adjust left
    rcWorldSpace.left+=iLeftAdjust;
    //adjust top
    rcWorldSpace.top+=iTopAdjust;
    //adjust right
    rcWorldSpace.right+=iRightAdjust;
    //adjust bottom
    rcWorldSpace.bottom+=iBottomAdjust;
}

//retrieve width of worldspace
int CScroller::GetWorldSpaceWidth()
{
    //return width of rect
    return(rcWorldSpace.right-rcWorldSpace.left);
}

//retrieve height of worldspace
int CScroller::GetWorldSpaceHeight()
{
    //return height of rect
    return(rcWorldSpace.bottom-rcWorldSpace.top);
}

//calc worldspace based on a tileplotter and map width and height
void CScroller::CalcWorldSpace(CTilePlotter* TilePlotter,RECT* prcExtent,int iMapWidth,int iMapHeight)
{
    //set worldspace rect to empty
    SetRectEmpty(&rcWorldSpace);

    //temporary rectangle
    RECT rcTemp;
    CopyRect(&rcTemp,prcExtent);

    //point for plotting
    POINT ptPlot;

    //map point
    POINT ptMap;

    //loop through map positions
    for(ptMap.x=0;ptMap.x<iMapWidth;ptMap.x++)
    {
        for(ptMap.y=0;ptMap.y<iMapHeight;ptMap.y++)
        {
            //plot the map point
            ptPlot=TilePlotter->PlotTile(ptMap);

            //adjust the temp rect
            OffsetRect(&rcTemp,ptPlot.x,ptPlot.y);

            //expand the boundaries of worldspace
            //left
            if(rcTemp.left<rcWorldSpace.left) rcWorldSpace.left=rcTemp.left;
            //top
            if(rcTemp.top<rcWorldSpace.top) rcWorldSpace.top=rcTemp.top;
            //right
            if(rcTemp.right>rcWorldSpace.right) rcWorldSpace.right=rcTemp.right;
            //bottom
            if(rcTemp.bottom>rcWorldSpace.bottom) rcWorldSpace.bottom=rcTemp.bottom;

            //adjust the temp rect back
            OffsetRect(&rcTemp,-ptPlot.x,-ptPlot.y);
        }
    }
}

//anchor space
//get anchorspace
RECT* CScroller::GetAnchorSpace()
{
    //return pointer to rect
    return(&rcAnchorSpace);
}

//set anchorspace
void CScroller::SetAnchorSpace(RECT* prcNewAnchorSpace)
{
    //copy rectangle
    CopyRect(&rcAnchorSpace,prcNewAnchorSpace);
}

//change anchorspace
void CScroller::AdjustAnchorSpace(int iLeftAdjust,int iTopAdjust,int iRightAdjust, int iBottomAdjust)
{
    //adjust left
    rcAnchorSpace.left+=iLeftAdjust;
    //adjust top
    rcAnchorSpace.top+=iTopAdjust;
    //adjust right
    rcAnchorSpace.right+=iRightAdjust;
    //adjust bottom
    rcAnchorSpace.bottom+=iBottomAdjust;
}

//retrieve width of anchorspace
int CScroller::GetAnchorSpaceWidth()
{
    //return width of rect
    return(rcAnchorSpace.right-rcAnchorSpace.left);
}

//retrieve height of anchorspace
int CScroller::GetAnchorSpaceHeight()
{
    //return height of rect
    return(rcAnchorSpace.bottom-rcAnchorSpace.top);
}

//calculates anchor space based on world space and screen space
void CScroller::CalcAnchorSpace()
{
    //copy worldspace
    CopyRect(&rcAnchorSpace,&rcWorldSpace);

    //subtract out screen space
    if(GetHWrapMode()!=WRAPMODE_WRAP) rcAnchorSpace.right-=GetScreenSpaceWidth();
    if(GetVWrapMode()!=WRAPMODE_WRAP) rcAnchorSpace.bottom-=GetScreenSpaceHeight();

    //make sure right!<left and bottom !<top
    if(rcAnchorSpace.right<=rcAnchorSpace.left) rcAnchorSpace.right=rcAnchorSpace.left+1;
    if(rcAnchorSpace.bottom<=rcAnchorSpace.top) rcAnchorSpace.bottom=rcAnchorSpace.top+1;
}

//anchor
//retrieve anchor
POINT* CScroller::GetAnchor()
{
    //return screen anchor
    return(&ptScreenAnchor);
}

//set anchor
void CScroller::SetAnchor(POINT* pptNewAnchor,bool bWrap)
{
    //copy position
    ptScreenAnchor.x=pptNewAnchor->x;
    ptScreenAnchor.y=pptNewAnchor->y;

    //optionally apply wrapping mode
    if(bWrap) WrapAnchor();
}

//move anchor
void CScroller::MoveAnchor(int iXAdjust,int iYAdjust,bool bWrap)
{
    //adjust screen anchor
    ptScreenAnchor.x+=iXAdjust;
    ptScreenAnchor.y+=iYAdjust;

    //optionally wrap/clip anchor
    if(bWrap) WrapAnchor();
}

//apply wrapmode to anchor
void CScroller::WrapAnchor()
{
    //horizontal wrapping
    switch(swmHorizontal)
    {
    case WRAPMODE_CLIP:
        {
            //clip to left
            if(ptScreenAnchor.x<rcAnchorSpace.left) ptScreenAnchor.x=rcAnchorSpace.left;
            //clip to right
            if(ptScreenAnchor.x>=rcAnchorSpace.right) ptScreenAnchor.x=rcAnchorSpace.right-1;
        }break;
    case WRAPMODE_WRAP:
        {
            //left wrapping
            while(ptScreenAnchor.x<rcAnchorSpace.left) ptScreenAnchor.x+=GetAnchorSpaceWidth();
            //right wrapping
            while(ptScreenAnchor.x>=rcAnchorSpace.right) ptScreenAnchor.x-=GetAnchorSpaceWidth();
        }break;
    }
    //vertical wrapping
    switch(swmVertical)
    {
    case WRAPMODE_CLIP:
        {
            //clip to top
            if(ptScreenAnchor.y<rcAnchorSpace.top) ptScreenAnchor.y=rcAnchorSpace.top;
            //clip to bottom
            if(ptScreenAnchor.y>=rcAnchorSpace.bottom) ptScreenAnchor.y=rcAnchorSpace.bottom-1;
        }break;
    case WRAPMODE_WRAP:
        {
            //top wrapping
            while(ptScreenAnchor.y<rcAnchorSpace.top) ptScreenAnchor.y+=GetAnchorSpaceWidth();
            //bottom wrapping
            while(ptScreenAnchor.y>=rcAnchorSpace.bottom) ptScreenAnchor.y-=GetAnchorSpaceWidth();
        }break;
    }
}

//conversion
//screen->world
POINT CScroller::ScreenToWorld(POINT ptScreen)
{
    //translate into plotspace coordinates
    ptScreen.x-=rcScreenSpace.left;
    ptScreen.y-=rcScreenSpace.top;

    //translate into world coordinates
    ptScreen.x+=ptScreenAnchor.x;
    ptScreen.y+=ptScreenAnchor.y;

    //return coordinates
    return(ptScreen);
}

//world->screen
POINT CScroller::WorldToScreen(POINT ptWorld)
{
    //translate into plotspace coordinates
    ptWorld.x-=ptScreenAnchor.x;
    ptWorld.y-=ptScreenAnchor.y;

    //translate into screen coordinates
    ptWorld.x+=rcScreenSpace.left;
    ptWorld.y+=rcScreenSpace.top;

    //return cooridinates
    return(ptWorld);
}

//wrap modes
//setters
//horizontal
void CScroller::SetHWrapMode(SCROLLERWRAPMODE ScrollerWrapMode)
{
    //set wrap mode
    swmHorizontal=ScrollerWrapMode;
}

//vertical
void CScroller::SetVWrapMode(SCROLLERWRAPMODE ScrollerWrapMode)
{
    //set wrap mode
    swmVertical=ScrollerWrapMode;
}

//getters
//horiz
SCROLLERWRAPMODE CScroller::GetHWrapMode()
{
    //return wrap mode
    return(swmHorizontal);
}

//vertical
SCROLLERWRAPMODE CScroller::GetVWrapMode()
{
    //return wrap mode
    return(swmVertical);
}

//validation
//world
bool CScroller::IsWorldCoord(POINT ptWorld)
{
    //check for valid coordinate
    return(PtInRect(&rcWorldSpace,ptWorld)!=FALSE);
}

//screen
bool CScroller::IsScreenCoord(POINT ptScreen)
{
    //check for valid coordinate
    return(PtInRect(&rcScreenSpace,ptScreen)!=FALSE);
}

//anchor
bool CScroller::IsAnchorCoord(POINT ptAnchor)
{
    //check for valid coordinate
    return(PtInRect(&rcAnchorSpace,ptAnchor)!=FALSE);
}