public static void PolyDraw(
System.Drawing.Drawing2D.GraphicsPath pPath,
POINT[] lppt,
byte[] lpbTypes,
int cCount)
{
int nIndex;
POINT pptLastMoveTo = new POINT();
POINT pptPrev = new POINT();
bool bLastMoveToNull = true;
// for each of the points we have...
for (nIndex = 0; nIndex < cCount; nIndex++)
{
switch (lpbTypes[nIndex])
{
case PT_MOVETO:
if (bLastMoveToNull == false && nIndex > 0)
{
pPath.CloseFigure();
}
pptLastMoveTo = lppt[nIndex];
bLastMoveToNull = false;
pptPrev = lppt[nIndex];
break;
case PT_LINETO | PT_CLOSEFIGURE:
pPath.AddLine(pptPrev.X, pptPrev.Y, lppt[nIndex].X, lppt[nIndex].Y);
pptPrev = lppt[nIndex];
if (bLastMoveToNull == false)
{
pPath.CloseFigure();
pptPrev = pptLastMoveTo;
}
bLastMoveToNull = true;
break;
case PT_LINETO:
pPath.AddLine(pptPrev.X, pptPrev.Y, lppt[nIndex].X, lppt[nIndex].Y);
pptPrev = lppt[nIndex];
break;
case PT_BEZIERTO | PT_CLOSEFIGURE:
//ASSERT(nIndex + 2 <= cCount);
pPath.AddBezier(
pptPrev.X, pptPrev.Y,
lppt[nIndex].X, lppt[nIndex].Y,
lppt[nIndex + 1].X, lppt[nIndex + 1].Y,
lppt[nIndex + 2].X, lppt[nIndex + 2].Y);
nIndex += 2;
pptPrev = lppt[nIndex];
if (bLastMoveToNull == false)
{
pPath.CloseFigure();
pptPrev = pptLastMoveTo;
}
bLastMoveToNull = true;
break;
case PT_BEZIERTO:
//ASSERT(nIndex + 2 <= cCount);
pPath.AddBezier(
pptPrev.X, pptPrev.Y,
lppt[nIndex].X, lppt[nIndex].Y,
lppt[nIndex + 1].X, lppt[nIndex + 1].Y,
lppt[nIndex + 2].X, lppt[nIndex + 2].Y);
nIndex += 2;
pptPrev = lppt[nIndex];
break;
}
}
// If the figure was never closed and should be,
// close it now.
if (bLastMoveToNull == false && nIndex > 1)
{
pPath.AddLine(pptPrev.X, pptPrev.Y, pptLastMoveTo.X, pptLastMoveTo.Y);
//pPath->CloseFigure();
}
}
static extern bool PolyDraw(IntPtr hdc, POINT[] lppt, byte[] lpbTypes, int cCount);
public static bool GetStringPath(
System.Drawing.Graphics pGraphics,
System.Drawing.Drawing2D.GraphicsPath ppPath,
string pszText,
LOGFONT plf,
System.Drawing.Rectangle rtDraw)
{
IntPtr hDC = pGraphics.GetHdc();
int nPrevMode = SetBkMode(hDC, TRANSPARENT);
// create and select it
IntPtr hFont = CreateFontIndirect(plf);
if (null == hFont)
return false;
IntPtr hOldFont = (IntPtr)SelectObject(hDC, hFont);
RECT rect = new RECT(rtDraw);
// use a path to record how the text was drawn
const uint DT_CENTER = 0x00000001;
BeginPath(hDC);
DrawText(hDC, pszText, pszText.Length, ref rect, DT_CENTER);
EndPath(hDC);
// Find out how many points are in the path. Note that
// for long strings or complex fonts, this number might be
// gigantic!
int nNumPts = GetPath(hDC, null, null, 0);
if (nNumPts == 0)
return false;
// Allocate memory to hold points and stroke types from
// the path.
POINT[] lpPoints = new POINT[nNumPts];
byte[] lpTypes = new byte[nNumPts];
// Now that we have the memory, really get the path data.
nNumPts = GetPath(hDC, lpPoints, lpTypes, nNumPts);
// If it worked, draw the lines. Win95 and Win98 don't support
// the PolyDraw API, so we use our own member function to do
// similar work. If you're targeting only Windows NT, you can
// use the PolyDraw() API and avoid the COutlineView::PolyDraw()
// member function.
if (nNumPts != -1)
PolyDraw(ppPath, lpPoints, lpTypes, nNumPts);
// Put back the old font
SelectObject(hDC, hOldFont);
DeleteObject(hFont);
SetBkMode(hDC, nPrevMode);
pGraphics.ReleaseHdc(hDC);
return true;
}