public static extern int UpdateLayeredWindow(IntPtr hWnd,
IntPtr hdcDst,
ref POINT pptDst,
ref SIZE psize,
IntPtr hdcSrc,
ref POINT pptSrc,
uint crKey,
ref BLENDFUNCTION pblend,
uint dwFlags);
// Measure how wide and high the string is standing on its own
/// <summary>
/// This is the way to measure a string.
/// </summary>
/// <param name="aString"></param>
/// <returns></returns>
public System.Drawing.Size MeasureString(string aString)
{
// Create a screen context to do the measuring
GDIContext dc = GDIContext.CreateForDefaultDisplay();
dc.SelectObject(this);
SIZE aSize = new SIZE();
GDI32.GetTextExtentPoint32(dc, aString, aString.Length, out aSize);
// Unselect the font from the DC
// Destroy the DC
// Return the size
return new System.Drawing.Size(aSize.cx, aSize.cy);
}
public static extern bool SetWindowExtEx([In] SafeHandle hdc, int nXExtent, int nYExtent,
ref SIZE lpSize);
public static extern bool GetViewportExtEx([In] SafeHandle hdc, out SIZE lpSize);
public static extern bool GetWindowExtEx([In] SafeHandle hdc, out SIZE lpSize);
// get the combined world to device coordinate space mapping
public bool GetDPtoLP(GDIContext hDC)
{
if (!GDI32.GetWorldTransform(hDC, out fMatrix))
return false;
POINT origin = new POINT();
GDI32.GetWindowOrgEx(hDC, out origin);
Translate(-(float)origin.X, -(float)origin.Y);
SIZE sizew = new SIZE();
SIZE sizev = new SIZE();
GDI32.GetWindowExtEx(hDC, out sizew);
GDI32.GetViewportExtEx(hDC, out sizev);
Scale((float)sizew.Width / sizev.Height, (float)sizew.Height / sizev.Height);
GDI32.GetViewportOrgEx(hDC, out origin);
Translate((float)origin.X, (float)origin.Y);
return true;
}
public static extern bool GetTextExtentPoint32([In] SafeHandle hDC,
[In] string lpString,
int cbString, out SIZE lpSize);
