/// <summary>
/// Creates a rounded rectangle using the specified corner radius<br/>
/// NW-----NE
/// | |
/// | |
/// SW-----SE
/// </summary>
/// <param name="g">the device to draw into</param>
/// <param name="rect">Rectangle to round</param>
/// <param name="nwRadius">Radius of the north east corner</param>
/// <param name="neRadius">Radius of the north west corner</param>
/// <param name="seRadius">Radius of the south east corner</param>
/// <param name="swRadius">Radius of the south west corner</param>
/// <returns>GraphicsPath with the lines of the rounded rectangle ready to be painted</returns>
public static RGraphicsPath GetRoundRect(RGraphics g, RRect rect, double nwRadius, double neRadius, double seRadius, double swRadius)
{
var path = g.GetGraphicsPath();
path.Start(rect.Left + nwRadius, rect.Top);
path.LineTo(rect.Right - neRadius, rect.Y);
if (neRadius > 0f)
path.ArcTo(rect.Right, rect.Top + neRadius, neRadius, RGraphicsPath.Corner.TopRight);
path.LineTo(rect.Right, rect.Bottom - seRadius);
if (seRadius > 0f)
path.ArcTo(rect.Right - seRadius, rect.Bottom, seRadius, RGraphicsPath.Corner.BottomRight);
path.LineTo(rect.Left + swRadius, rect.Bottom);
if (swRadius > 0f)
path.ArcTo(rect.Left, rect.Bottom - swRadius, swRadius, RGraphicsPath.Corner.BottomLeft);
path.LineTo(rect.Left, rect.Top + nwRadius);
if (nwRadius > 0f)
path.ArcTo(rect.Left + nwRadius, rect.Top, nwRadius, RGraphicsPath.Corner.TopLeft);
return path;
}
/// <summary>
/// Makes a border path for rounded borders.<br/>
/// To support rounded dotted/dashed borders we need to use arc in the border path.<br/>
/// Return null if the border is not rounded.<br/>
/// </summary>
/// <param name="g">the device to draw into</param>
/// <param name="border">Desired border</param>
/// <param name="b">Box which the border corresponds</param>
/// <param name="r">the rectangle the border is enclosing</param>
/// <returns>Beveled border path, null if there is no rounded corners</returns>
private static RGraphicsPath GetRoundedBorderPath(RGraphics g, Border border, CssBox b, RRect r)
{
RGraphicsPath path = null;
switch (border)
{
case Border.Top:
if (b.ActualCornerNw > 0 || b.ActualCornerNe > 0)
{
path = g.GetGraphicsPath();
path.Start(r.Left + b.ActualBorderLeftWidth / 2, r.Top + b.ActualBorderTopWidth / 2 + b.ActualCornerNw);
if (b.ActualCornerNw > 0)
path.ArcTo(r.Left + b.ActualBorderLeftWidth / 2 + b.ActualCornerNw, r.Top + b.ActualBorderTopWidth / 2, b.ActualCornerNw, RGraphicsPath.Corner.TopLeft);
path.LineTo(r.Right - b.ActualBorderRightWidth / 2 - b.ActualCornerNe, r.Top + b.ActualBorderTopWidth / 2);
if (b.ActualCornerNe > 0)
path.ArcTo(r.Right - b.ActualBorderRightWidth / 2, r.Top + b.ActualBorderTopWidth / 2 + b.ActualCornerNe, b.ActualCornerNe, RGraphicsPath.Corner.TopRight);
}
break;
case Border.Bottom:
if (b.ActualCornerSw > 0 || b.ActualCornerSe > 0)
{
path = g.GetGraphicsPath();
path.Start(r.Right - b.ActualBorderRightWidth / 2, r.Bottom - b.ActualBorderBottomWidth / 2 - b.ActualCornerSe);
if (b.ActualCornerSe > 0)
path.ArcTo(r.Right - b.ActualBorderRightWidth / 2 - b.ActualCornerSe, r.Bottom - b.ActualBorderBottomWidth / 2, b.ActualCornerSe, RGraphicsPath.Corner.BottomRight);
path.LineTo(r.Left + b.ActualBorderLeftWidth / 2 + b.ActualCornerSw, r.Bottom - b.ActualBorderBottomWidth / 2);
if (b.ActualCornerSw > 0)
path.ArcTo(r.Left + b.ActualBorderLeftWidth / 2, r.Bottom - b.ActualBorderBottomWidth / 2 - b.ActualCornerSw, b.ActualCornerSw, RGraphicsPath.Corner.BottomLeft);
}
break;
case Border.Right:
if (b.ActualCornerNe > 0 || b.ActualCornerSe > 0)
{
path = g.GetGraphicsPath();
bool noTop = b.BorderTopStyle == CssConstants.None || b.BorderTopStyle == CssConstants.Hidden;
bool noBottom = b.BorderBottomStyle == CssConstants.None || b.BorderBottomStyle == CssConstants.Hidden;
path.Start(r.Right - b.ActualBorderRightWidth / 2 - (noTop ? b.ActualCornerNe : 0), r.Top + b.ActualBorderTopWidth / 2 + (noTop ? 0 : b.ActualCornerNe));
if (b.ActualCornerNe > 0 && noTop)
path.ArcTo(r.Right - b.ActualBorderLeftWidth / 2, r.Top + b.ActualBorderTopWidth / 2 + b.ActualCornerNe, b.ActualCornerNe, RGraphicsPath.Corner.TopRight);
path.LineTo(r.Right - b.ActualBorderRightWidth / 2, r.Bottom - b.ActualBorderBottomWidth / 2 - b.ActualCornerSe);
if (b.ActualCornerSe > 0 && noBottom)
path.ArcTo(r.Right - b.ActualBorderRightWidth / 2 - b.ActualCornerSe, r.Bottom - b.ActualBorderBottomWidth / 2, b.ActualCornerSe, RGraphicsPath.Corner.BottomRight);
}
break;
case Border.Left:
if (b.ActualCornerNw > 0 || b.ActualCornerSw > 0)
{
path = g.GetGraphicsPath();
bool noTop = b.BorderTopStyle == CssConstants.None || b.BorderTopStyle == CssConstants.Hidden;
bool noBottom = b.BorderBottomStyle == CssConstants.None || b.BorderBottomStyle == CssConstants.Hidden;
path.Start(r.Left + b.ActualBorderLeftWidth / 2 + (noBottom ? b.ActualCornerSw : 0), r.Bottom - b.ActualBorderBottomWidth / 2 - (noBottom ? 0 : b.ActualCornerSw));
if (b.ActualCornerSw > 0 && noBottom)
path.ArcTo(r.Left + b.ActualBorderLeftWidth / 2, r.Bottom - b.ActualBorderBottomWidth / 2 - b.ActualCornerSw, b.ActualCornerSw, RGraphicsPath.Corner.BottomLeft);
path.LineTo(r.Left + b.ActualBorderLeftWidth / 2, r.Top + b.ActualBorderTopWidth / 2 + b.ActualCornerNw);
if (b.ActualCornerNw > 0 && noTop)
path.ArcTo(r.Left + b.ActualBorderLeftWidth / 2 + b.ActualCornerNw, r.Top + b.ActualBorderTopWidth / 2, b.ActualCornerNw, RGraphicsPath.Corner.TopLeft);
}
break;
}
return path;
}