protected void GetModifyPointers(int nHandle, ref int ppx, ref int ppy, ref int px, ref int py, bool bModify)
{
Debug.Assert(nHandle >= 0);
Debug.Assert(nHandle <= 8);
if (nHandle == (int)TrackerHit.hitMiddle)
{
nHandle = (int)TrackerHit.hitTopLeft; // same as hitting top-left
}
ppx = -1;
ppy = -1;
// fill in the part of the rect that this handle modifies
// (Note: handles that map to themselves along a given axis when that
// axis is inverted don't modify the value on that axis)
HANDLEINFO handleInfo = HandleInfo[nHandle];
if (handleInfo.nInvertX != nHandle)
{
ppx = (int)handleInfo.nOffsetX;
if (bModify)
{
px = GetRectInt(ppx);
}
}
else
{
// middle handle on X axis
if (bModify)
{
px = m_rect.Left + Math.Abs(m_rect.Width) / 2;
}
}
if (handleInfo.nInvertY != nHandle)
{
ppy = (int)handleInfo.nOffsetY;
if (bModify)
{
py = GetRectInt(ppy);
}
}
else
{
// middle handle on Y axis
if (bModify)
{
py = m_rect.Top + Math.Abs(m_rect.Height) / 2;
}
}
}
protected void GetHandleRect(int nHandle, ref Rectangle Changerect)
{
System.Diagnostics.Debug.Assert(nHandle < 8);
// get normalized rectangle of the tracker
Rectangle rectT = m_rect;
NormalizeRect(ref rectT);
if ((m_nStyle & (StyleFlags.solidLine | StyleFlags.dottedLine)) != 0)
{
rectT.Inflate(+1, +1);
}
// since the rectangle itself was normalized, we also have to invert the
// resize handles.
nHandle = NormalizeHit(nHandle);
// handle case of resize handles outside the tracker
int size = GetHandleSize(new Rectangle());
if ((m_nStyle & StyleFlags.resizeOutside) != 0)
{
rectT.Inflate(size, size);
}
// calculate position of the resize handle
int nWidth = rectT.Width;
int nHeight = rectT.Height;
Rectangle rect = new Rectangle();
HANDLEINFO handleInfo = HandleInfo[nHandle];
int[] arr = new int[4] {
rectT.Left, rectT.Right, rectT.Top, rectT.Bottom
};
rect.X = arr[(int)handleInfo.nOffsetX];
rect.Y = arr[(int)handleInfo.nOffsetY];
rect.X += size * handleInfo.nHandleX;
rect.Y += size * handleInfo.nHandleY;
rect.X += handleInfo.nCenterX * (nWidth - size) / 2;
rect.Y += handleInfo.nCenterY * (nHeight - size) / 2;
rect.Width = size;
rect.Height = size;
Changerect = rect;
}
protected int NormalizeHit(int nHandle)
{
Debug.Assert(nHandle <= 8 && nHandle >= -1);
if (nHandle == (int)TrackerHit.hitMiddle || nHandle == (int)TrackerHit.hitNothing)
{
return(nHandle);
}
HANDLEINFO handleInfo = HandleInfo[nHandle];
if (m_rect.Width < 0)
{
nHandle = handleInfo.nInvertX;
handleInfo = HandleInfo[nHandle];
}
if (m_rect.Height < 0)
{
nHandle = handleInfo.nInvertY;
}
return(nHandle);
}