public unsafe void DrawLine(WindowsPen pen, int x1, int y1, int x2, int y2)
{
HandleRef hdc = new HandleRef(DeviceContext, DeviceContext.Hdc);
Gdi32.R2 rasterOp = DeviceContext.BinaryRasterOperation;
Gdi32.BKMODE bckMode = DeviceContext.BackgroundMode;
if (rasterOp != Gdi32.R2.COPYPEN)
{
rasterOp = DeviceContext.SetRasterOperation(Gdi32.R2.COPYPEN);
}
if (bckMode != Gdi32.BKMODE.TRANSPARENT)
{
bckMode = DeviceContext.SetBackgroundMode(Gdi32.BKMODE.TRANSPARENT);
}
if (pen != null)
{
DeviceContext.SelectObject(pen.HPen, GdiObjectType.Pen);
}
Point oldPoint = new Point();
IntUnsafeNativeMethods.MoveToEx(hdc, x1, y1, &oldPoint);
IntUnsafeNativeMethods.LineTo(hdc, x2, y2);
if (bckMode != Gdi32.BKMODE.TRANSPARENT)
{
DeviceContext.SetBackgroundMode(bckMode);
}
if (rasterOp != Gdi32.R2.COPYPEN)
{
DeviceContext.SetRasterOperation(rasterOp);
}
IntUnsafeNativeMethods.MoveToEx(hdc, oldPoint.X, oldPoint.Y, &oldPoint);
}
public unsafe void DrawLine(WindowsPen pen, int x1, int y1, int x2, int y2)
{
HandleRef hdc = new HandleRef(DeviceContext, DeviceContext.Hdc);
DeviceContextBinaryRasterOperationFlags rasterOp = DeviceContext.BinaryRasterOperation;
DeviceContextBackgroundMode bckMode = DeviceContext.BackgroundMode;
if (rasterOp != DeviceContextBinaryRasterOperationFlags.CopyPen)
{
rasterOp = DeviceContext.SetRasterOperation(DeviceContextBinaryRasterOperationFlags.CopyPen);
}
if (bckMode != DeviceContextBackgroundMode.Transparent)
{
bckMode = DeviceContext.SetBackgroundMode(DeviceContextBackgroundMode.Transparent);
}
if (pen != null)
{
DeviceContext.SelectObject(pen.HPen, GdiObjectType.Pen);
}
Point oldPoint = new Point();
IntUnsafeNativeMethods.MoveToEx(hdc, x1, y1, &oldPoint);
IntUnsafeNativeMethods.LineTo(hdc, x2, y2);
if (bckMode != DeviceContextBackgroundMode.Transparent)
{
DeviceContext.SetBackgroundMode(bckMode);
}
if (rasterOp != DeviceContextBinaryRasterOperationFlags.CopyPen)
{
DeviceContext.SetRasterOperation(rasterOp);
}
IntUnsafeNativeMethods.MoveToEx(hdc, oldPoint.X, oldPoint.Y, &oldPoint);
}
/// <summary>
/// Draws the text in the given bounds, using the given Font, foreColor and backColor, and according to the specified
/// TextFormatFlags flags.
///
/// If font is null, the font currently selected in the hdc is used.
///
/// If foreColor and/or backColor are Color.Empty, the hdc current text and/or background color are used.
/// </summary>
public void DrawText(string text, WindowsFont font, Rectangle bounds, Color foreColor, Color backColor, User32.DT flags)
{
if (string.IsNullOrEmpty(text) || foreColor == Color.Transparent)
{
return;
}
Debug.Assert(((uint)flags & GdiUnsupportedFlagMask) == 0, "Some custom flags were left over and are not GDI compliant!");
Debug.Assert((flags & User32.DT.CALCRECT) == 0, "CALCRECT flag is set, text won't be drawn");
HandleRef hdc = new HandleRef(DeviceContext, DeviceContext.Hdc);
// DrawText requires default text alignment.
if (DeviceContext.TextAlignment != default)
{
DeviceContext.TextAlignment = default;
}
// color empty means use the one currently selected in the dc.
if (!foreColor.IsEmpty && foreColor != DeviceContext.TextColor)
{
DeviceContext.TextColor = foreColor;
}
if (font != null)
{
DeviceContext.SelectFont(font);
}
Gdi32.BKMODE newBackGndMode = (backColor.IsEmpty || backColor == Color.Transparent) ?
Gdi32.BKMODE.TRANSPARENT :
Gdi32.BKMODE.OPAQUE;
if (DeviceContext.BackgroundMode != newBackGndMode)
{
DeviceContext.SetBackgroundMode(newBackGndMode);
}
if (newBackGndMode != Gdi32.BKMODE.TRANSPARENT && backColor != DeviceContext.BackgroundColor)
{
DeviceContext.BackgroundColor = backColor;
}
User32.DRAWTEXTPARAMS dtparams = GetTextMargins(font);
bounds = AdjustForVerticalAlignment(hdc, text, bounds, flags, ref dtparams);
// Adjust unbounded rect to avoid overflow since Rectangle ctr does not do param validation.
if (bounds.Width == MaxSize.Width)
{
bounds.Width -= bounds.X;
}
if (bounds.Height == MaxSize.Height)
{
bounds.Height -= bounds.Y;
}
var rect = new RECT(bounds);
User32.DrawTextExW(hdc, text, text.Length, ref rect, flags, ref dtparams);
// No need to restore previous objects into the dc (see comments on top of the class).
}
