void CardRegion::Clip(HDC hdc)
{
int numtoclip;
if(fVisible == false)
return;
Update(); //Update this stack's size+card count
numtoclip = nNumApparentCards;
//if we are making this stack flash on/off, then only
//clip the stack for drawing if the flash is in its ON state
if(nFlashCount != 0)
{
if(fFlashVisible == FALSE)
numtoclip = 0;
}
//if offset along a diagonal
if(xoffset != 0 && yoffset != 0 && cardstack.NumCards() != 0)
{
for(int j = 0; j < numtoclip; j ++)
{
ClipCard(hdc, xpos + xoffset * j, ypos + yoffset * j, __cardwidth, __cardheight);
}
}
//otherwise if just offset along a horizontal/vertical axis
else
{
if(yoffset < 0 && numtoclip > 0)
{
ClipCard(hdc, xpos, ypos-((numtoclip-1)*-yoffset), width, height);
}
else if(xoffset < 0 && numtoclip > 0)
{
ClipCard(hdc, xpos-((numtoclip-1)*-xoffset), ypos, width, height);
}
else
{
ClipCard(hdc, xpos, ypos, width, height);
}
}
}
void CardRegion::MoveDragCardTo(HDC hdc, int x, int y)
{
RECT inter, rect1, rect2;
//mask off the new position of the drag-card, so
//that it will not be painted over
ClipCard(hdc, x, y, nDragCardWidth, nDragCardHeight);
//restore the area covered by the card at its previous position
BitBlt(hdc, oldx, oldy, nDragCardWidth, nDragCardHeight, hdcBackGnd, 0, 0, SRCCOPY);
//remove clipping so we can draw the card at its new place
SelectClipRgn(hdc, NULL);
//if the card's old and new positions overlap, then we
//need some funky code to update the "saved background" image,
SetRect(&rect1, oldx, oldy, oldx+nDragCardWidth, oldy+nDragCardHeight);
SetRect(&rect2, x, y, x+nDragCardWidth, y+nDragCardHeight);
if(IntersectRect(&inter, &rect1, &rect2))
{
int interwidth = inter.right-inter.left;
int interheight = inter.bottom-inter.top;
int destx, desty, srcx, srcy;
if(rect2.left > rect1.left)
{
destx = 0; srcx = nDragCardWidth - interwidth;
}
else
{
destx = nDragCardWidth - interwidth; srcx = 0;
}
if(rect2.top > rect1.top)
{
desty = 0; srcy = nDragCardHeight - interheight;
}
else
{
desty = nDragCardHeight - interheight; srcy = 0;
}
//shift the bit we didn't use for the restore (due to the clipping)
//into the opposite corner
BitBlt(hdcBackGnd, destx,desty, interwidth, interheight, hdcBackGnd, srcx, srcy, SRCCOPY);
ExcludeClipRect(hdcBackGnd, destx, desty, destx+interwidth, desty+interheight);
//this bit requires us to clip the BitBlt (from screen to background)
//as BitBlt is a bit buggy it seems
ClippedBitBlt(hdcBackGnd, 0,0, nDragCardWidth, nDragCardHeight, hdc, x, y, SRCCOPY);
SelectClipRgn(hdcBackGnd, NULL);
}
else
{
BitBlt(hdcBackGnd, 0,0, nDragCardWidth, nDragCardHeight, hdc, x, y, SRCCOPY);
}
//finally draw the card to the screen
DrawCard(hdc, x, y, hdcDragCard, nDragCardWidth, nDragCardHeight);
}
