private void SelectObject(object obj)
{
if (obj == null)
{
throw(new ArgumentNullException("obj"));
}
if (obj is GdiPen)
{
GdiPen pen = (GdiPen)obj;
_currentPen = pen;
Win32.SelectObject(_hdc, pen.NativePen);
}
else if (obj is GdiBrush)
{
GdiBrush brush = (GdiBrush)obj;
_currentBrush = brush;
Win32.SelectObject(_hdc, brush.NativeBrush);
}
else if (obj is GdiFont)
{
GdiFont font = (GdiFont)obj;
_currentFont = font;
Win32.SelectObject(_hdc, font.NativeFont);
}
else
{
throw(new Exception("Unknow gdi object"));
}
}
public GdiPen SelectPen(GdiPen pen)
{
if (pen == null)
{
throw(new ArgumentNullException("pen"));
}
if (pen.NativePen != IntPtr.Zero)
{
this.SelectObject(pen);
return(pen);
}
GdiPen gdiPen = null;
_penTable.TryGetValue(pen.Key, out gdiPen);
if (gdiPen == null)
{
gdiPen = pen;
_penTable.Add(pen.Key, pen);
}
this.CheckNativePen(gdiPen);
this.SelectObject(gdiPen);
return(gdiPen);
}
private void CheckNativePen(GdiPen gdiPen)
{
if (gdiPen.NativePen == IntPtr.Zero)
{
gdiPen.SetNativePen(Win32.CreatePen(gdiPen.GdiStyle, gdiPen.Width, gdiPen.GdiColor));
}
}
internal void SelectGridPen(ChartGraphics g)
{
if (_gridPen == null || _gridPen.Color != this.Owner.GridColor)
{
_gridPen = new GdiPen(this.Owner.GridColor, 1, System.Drawing.Drawing2D.DashStyle.Dot);
}
g.SelectPen(_gridPen);
}
public void DrawRectangleExt(GdiPen gdiPen, int x, int y, int width, int height)
{
if (gdiPen == null)
{
throw (new ArgumentNullException("gdiPen"));
}
this.CheckNativePen(gdiPen);
Win32.FrameRect(this._hdc, x, y, width + 1, height + 1, gdiPen.NativePen);
}
public void DrawLineExt(GdiPen gdiPen, int x1, int y1, int x2, int y2)
{
if (gdiPen == null)
{
throw (new ArgumentNullException("gdiPen"));
}
this.CheckNativePen(gdiPen);
Win32.SelectObject(_hdc, gdiPen.NativePen);
this.DrawLine(x1, y1, x2, y2);
Win32.SelectObject(_hdc, _currentPen.NativePen);
}
public void DrawRectangleExt(GdiPen pen, Rectangle rect)
{
this.DrawRectangleExt(pen, rect.X, rect.Y, rect.Width, rect.Height);
}
