private Point ScreenPtToClientPt(Point pt, IntPtr handle)
{
PI.POINTC clientPt = new PI.POINTC
{
x = pt.X,
y = pt.Y
};
// Negative positions are in the range 32767 -> 65535,
// so convert to actual int values for the negative positions
if (clientPt.x >= 32767)
{
clientPt.x = (clientPt.x - 65536);
}
if (clientPt.y >= 32767)
{
clientPt.y = (clientPt.y - 65536);
}
// Convert a 0,0 point from client to screen to find offsetting
PI.POINTC zeroPIPt = new PI.POINTC
{
x = 0,
y = 0
};
PI.MapWindowPoints(IntPtr.Zero, handle, zeroPIPt, 1);
// Adjust the client coordinate by the offset to get to screen
clientPt.x += zeroPIPt.x;
clientPt.y += zeroPIPt.y;
// Return as a managed point type
return(new Point(clientPt.x, clientPt.y));
}
public static Point ClientMouseMessageToScreenPt(Message m)
{
// Extract the x and y mouse position from message
PI.POINTC clientPt = new PI.POINTC();
clientPt.x = PI.LOWORD((int)m.LParam);
clientPt.y = PI.HIWORD((int)m.LParam);
// Negative positions are in the range 32767 -> 65535,
// so convert to actual int values for the negative positions
if (clientPt.x >= 32767) clientPt.x = (clientPt.x - 65536);
if (clientPt.y >= 32767) clientPt.y = (clientPt.y - 65536);
// Convert a 0,0 point from client to screen to find offsetting
PI.POINTC zeroPIPt = new PI.POINTC();
zeroPIPt.x = 0;
zeroPIPt.y = 0;
PI.MapWindowPoints(m.HWnd, IntPtr.Zero, zeroPIPt, 1);
// Adjust the client coordinate by the offset to get to screen
clientPt.x += zeroPIPt.x;
clientPt.y += zeroPIPt.y;
// Return as a managed point type
return new Point(clientPt.x, clientPt.y);
}
internal static extern int MapWindowPoints(IntPtr hWndFrom, IntPtr hWndTo, [In, Out] PI.POINTC pt, int cPoints);