private unsafe void CreatePen()
{
if (_width > 1)
{
// Geometric pen.
// From MSDN: if width > 1, the style must be PS_NULL, PS_SOLID, or PS_INSIDEFRAME.
_style |= Gdi32.PS.GEOMETRIC | Gdi32.PS.SOLID;
}
if (_wndBrush == null)
{
_nativeHandle = Gdi32.CreatePen(_style, _width, ColorTranslator.ToWin32(_color));
}
else
{
var lb = new Gdi32.LOGBRUSH
{
lbColor = ColorTranslator.ToWin32(_wndBrush.Color),
lbStyle = Gdi32.BS.SOLID,
lbHatch = IntPtr.Zero
};
// Note: We currently don't support custom styles, that's why 0 and null for last two params.
_nativeHandle = Gdi32.ExtCreatePen(_style, _width, ref lb, 0, null);
}
}
private static void DrawAndFillEllipse(Gdi32.HDC hdc, Gdi32.HPEN borderPen, Gdi32.HBRUSH fieldBrush, Rectangle bounds)
{
Debug.Assert(!hdc.IsNull, "Calling DrawAndFillEllipse with null wg");
if (hdc.IsNull)
{
return;
}
hdc.FillRectangle(fieldBrush, new Rectangle(bounds.X + 2, bounds.Y + 2, 8, 8));
hdc.FillRectangle(fieldBrush, new Rectangle(bounds.X + 4, bounds.Y + 1, 4, 10));
hdc.FillRectangle(fieldBrush, new Rectangle(bounds.X + 1, bounds.Y + 4, 10, 4));
hdc.DrawLine(borderPen, new Point(bounds.X + 4, bounds.Y + 0), new Point(bounds.X + 8, bounds.Y + 0));
hdc.DrawLine(borderPen, new Point(bounds.X + 4, bounds.Y + 11), new Point(bounds.X + 8, bounds.Y + 11));
hdc.DrawLine(borderPen, new Point(bounds.X + 2, bounds.Y + 1), new Point(bounds.X + 4, bounds.Y + 1));
hdc.DrawLine(borderPen, new Point(bounds.X + 8, bounds.Y + 1), new Point(bounds.X + 10, bounds.Y + 1));
hdc.DrawLine(borderPen, new Point(bounds.X + 2, bounds.Y + 10), new Point(bounds.X + 4, bounds.Y + 10));
hdc.DrawLine(borderPen, new Point(bounds.X + 8, bounds.Y + 10), new Point(bounds.X + 10, bounds.Y + 10));
hdc.DrawLine(borderPen, new Point(bounds.X + 0, bounds.Y + 4), new Point(bounds.X + 0, bounds.Y + 8));
hdc.DrawLine(borderPen, new Point(bounds.X + 11, bounds.Y + 4), new Point(bounds.X + 11, bounds.Y + 8));
hdc.DrawLine(borderPen, new Point(bounds.X + 1, bounds.Y + 2), new Point(bounds.X + 1, bounds.Y + 4));
hdc.DrawLine(borderPen, new Point(bounds.X + 1, bounds.Y + 8), new Point(bounds.X + 1, bounds.Y + 10));
hdc.DrawLine(borderPen, new Point(bounds.X + 10, bounds.Y + 2), new Point(bounds.X + 10, bounds.Y + 4));
hdc.DrawLine(borderPen, new Point(bounds.X + 10, bounds.Y + 8), new Point(bounds.X + 10, bounds.Y + 10));
}
internal static void DrawRectangle(this Gdi32.HDC hdc, Rectangle rectangle, Gdi32.HPEN hpen)
{
using var penScope = new Gdi32.SelectObjectScope(hdc, hpen);
using var ropScope = new Gdi32.SetRop2Scope(hdc, Gdi32.R2.COPYPEN);
using var brushScope = new Gdi32.SelectObjectScope(hdc, Gdi32.GetStockObject(Gdi32.StockObject.HOLLOW_BRUSH));
Gdi32.Rectangle(hdc, rectangle.X, rectangle.Y, rectangle.Right, rectangle.Bottom);
}
internal static void DrawRectangle(
this DeviceContextHdcScope hdc,
int left,
int top,
int right,
int bottom,
Gdi32.HPEN hpen)
=> DrawRectangle(hdc.HDC, left, top, right, bottom, hpen);
internal unsafe static void DrawLine(this Gdi32.HDC hdc, Gdi32.HPEN pen, int x1, int y1, int x2, int y2)
{
using var ropScope = new Gdi32.SetRop2Scope(hdc, Gdi32.R2.COPYPEN);
using var bkScope = new Gdi32.SetBkModeScope(hdc, Gdi32.BKMODE.TRANSPARENT);
using var selection = new Gdi32.SelectObjectScope(hdc, pen);
Point oldPoint = new Point();
Gdi32.MoveToEx(hdc, x1, y1, &oldPoint);
Gdi32.LineTo(hdc, x2, y2);
Gdi32.MoveToEx(hdc, oldPoint.X, oldPoint.Y, &oldPoint);
}
internal static void DrawRectangle(
this Gdi32.HDC hdc,
int left,
int top,
int right,
int bottom,
Gdi32.HPEN hpen)
{
using var penScope = new Gdi32.SelectObjectScope(hdc, hpen);
using var ropScope = new Gdi32.SetRop2Scope(hdc, Gdi32.R2.COPYPEN);
using var brushScope = new Gdi32.SelectObjectScope(hdc, Gdi32.GetStockObject(Gdi32.StockObject.NULL_BRUSH));
Gdi32.Rectangle(hdc, left, top, right, bottom);
}
internal static void DrawAndFillEllipse(
this Gdi32.HDC hdc,
Gdi32.HPEN pen,
Gdi32.HBRUSH brush,
int left,
int top,
int right,
int bottom)
{
using var penSelection = pen.IsNull ? default : new Gdi32.SelectObjectScope(hdc, pen);
using var brushSelection = brush.IsNull ? default : new Gdi32.SelectObjectScope(hdc, brush);
Gdi32.Ellipse(hdc, left, top, right, bottom);
}
/// <summary>
/// Draws lines with the <paramref name="hpen"/> using points defined in <paramref name="lines"/>.
/// </summary>
/// <param name="lines">
/// MUST be a mulitple of 4. Each group of 4 represents x1, y1, x2, y2.
/// </param>
internal unsafe static void DrawLines(this Gdi32.HDC hdc, Gdi32.HPEN hpen, ReadOnlySpan <int> lines)
{
Debug.Assert((lines.Length % 4) == 0);
using var ropScope = new Gdi32.SetRop2Scope(hdc, Gdi32.R2.COPYPEN);
using var bkScope = new Gdi32.SetBkModeScope(hdc, Gdi32.BKMODE.TRANSPARENT);
using var selection = new Gdi32.SelectObjectScope(hdc, hpen);
Point oldPoint = new Point();
for (int i = 0; i < lines.Length; i += 4)
{
Gdi32.MoveToEx(hdc, lines[i], lines[i + 1], &oldPoint);
Gdi32.LineTo(hdc, lines[i + 2], lines[i + 3]);
Gdi32.MoveToEx(hdc, oldPoint.X, oldPoint.Y, null);
}
}
void Dispose(bool disposing)
{
if (!_nativeHandle.IsNull && _dc != null)
{
_dc.DeleteObject(_nativeHandle, GdiObjectType.Pen);
_nativeHandle = default;
}
if (_wndBrush != null)
{
_wndBrush.Dispose();
_wndBrush = null;
}
if (disposing)
{
GC.SuppressFinalize(this);
}
}
internal unsafe static void DrawLine(this Gdi32.HDC hdc, Gdi32.HPEN hpen, int x1, int y1, int x2, int y2)
{
ReadOnlySpan <int> lines = stackalloc int[] { x1, y1, x2, y2 };
DrawLines(hdc, hpen, lines);
}
internal unsafe static void DrawLine(this DeviceContextHdcScope hdc, Gdi32.HPEN hpen, int x1, int y1, int x2, int y2) => DrawLine(hdc.HDC, hpen, x1, y1, x2, y2);
internal static void DrawLine(this Gdi32.HDC hdc, Gdi32.HPEN hpen, Point p1, Point p2) => DrawLine(hdc, hpen, p1.X, p1.Y, p2.X, p2.Y);
internal static void DrawLine(this DeviceContextHdcScope hdc, Gdi32.HPEN hpen, Point p1, Point p2) => DrawLine(hdc.HDC, hpen, p1.X, p1.Y, p2.X, p2.Y);
internal static void DrawRectangle(this DeviceContextHdcScope hdc, Rectangle rectangle, Gdi32.HPEN hpen) => DrawRectangle(hdc.HDC, rectangle, hpen);
internal static void DrawRectangle(this Gdi32.CreateDcScope hdc, Rectangle rectangle, Gdi32.HPEN hpen) => DrawRectangle(hdc.HDC, rectangle, hpen);
internal static void DrawRectangle(this DeviceContextHdcScope hdc, Rectangle rectangle, Gdi32.HPEN hpen) => DrawRectangle(hdc.HDC, rectangle.Left, rectangle.Top, rectangle.Right, rectangle.Bottom, hpen);
internal static void DrawRectangle(this User32.GetDcScope hdc, Rectangle rectangle, Gdi32.HPEN hpen) => DrawRectangle(hdc.HDC, rectangle, hpen);
/// <summary> /// Draws lines with the <paramref name="hpen"/> using points defined in <paramref name="lines"/>. /// </summary> /// <param name="lines"> /// MUST be a mulitple of 4. Each group of 4 represents x1, y1, x2, y2. /// </param> internal unsafe static void DrawLines(this DeviceContextHdcScope hdc, Gdi32.HPEN hpen, ReadOnlySpan <int> lines) => DrawLines(hdc.HDC, hpen, lines);
internal static void DrawLine(this User32.GetDcScope hdc, Gdi32.HPEN pen, int x1, int y1, int x2, int y2) => DrawLine(hdc.HDC, pen, x1, y1, x2, y2);
internal static void DrawAndFillEllipse(
this DeviceContextHdcScope hdc,
Gdi32.HPEN pen,
Gdi32.HBRUSH brush,
Rectangle bounds)
=> DrawAndFillEllipse(hdc.HDC, pen, brush, bounds.Left, bounds.Top, bounds.Right, bounds.Bottom);
internal static void DrawAndFillEllipse(this Gdi32.HDC hdc, Gdi32.HPEN pen, Gdi32.HBRUSH brush, Rectangle bounds) => DrawEllipse(hdc, pen, brush, bounds.Left, bounds.Top, bounds.Right, bounds.Bottom);