public static void DrawRectangle(Graphics dc, PenStyles penStyle, int penWidth, Color col,
int X1, int Y1, int X2, int Y2)
{
// Extract the Win32 HDC from the Graphics object supplied.
IntPtr hdc = dc.GetHdc();
// Create a pen.
IntPtr gdiPen = GDI.CreatePen(penStyle, penWidth, GDI.RGB(col.R, col.G, col.B));
GDI.SetROP2(hdc, drawingMode.R2_XORPEN);
GDI.SetBkMode(hdc, TRANSPARENT);
// Set the ROP cdrawint mode to XOR.
GDI.SetROP2(hdc, drawingMode.R2_XORPEN);
// Select the pen into the device context.
IntPtr oldPen = GDI.SelectObject(hdc, gdiPen);
// Create a stock NULL_BRUSH brush and select it into the device
// context so that the rectangle isn't filled.
IntPtr oldBrush = GDI.SelectObject(hdc, GDI.GetStockObject(NULL_BRUSH));
// Now XOR the hollow rectangle on the Graphics object with
// a dotted outline.
GDI.Rectangle(hdc, X1, Y1, X2, Y2);
// Put the old stuff back where it was.
GDI.SelectObject(hdc, oldBrush); // no need to delete a stock object
GDI.SelectObject(hdc, oldPen);
GDI.DeleteObject(gdiPen); // but we do need to delete the pen
// Return the device context to Windows.
dc.ReleaseHdc(hdc);
}
public static void DrawLine(PenStyles penStyle, int penWidth, Color col,
Graphics grp, int X1, int Y1, int X2, int Y2)
{
// Extract the Win32 HDC from the Graphics object supplied.
IntPtr hdc = grp.GetHdc();
// Create a pen.
IntPtr gdiPen = GDI.CreatePen(penStyle, penWidth, GDI.RGB(col.R, col.G, col.B));
GDI.SetROP2(hdc, drawingMode.R2_XORPEN);
GDI.SetBkMode(hdc, TRANSPARENT);
// Set the ROP cdrawint mode to XOR.
GDI.SetROP2(hdc, drawingMode.R2_XORPEN);
// Select the pen into the device context.
IntPtr oldPen = GDI.SelectObject(hdc, gdiPen);
// Draw the line.
GDI.MoveToEx(hdc, X1, Y1, 0);
GDI.LineTo(hdc, X2, Y2);
// Put the old stuff back where it was.
GDI.SelectObject(hdc, oldPen);
GDI.DeleteObject(gdiPen);
// Return the device context to Windows.
grp.ReleaseHdc(hdc);
}