/// <summary>
/// 绘制边框
/// </summary>
/// <param name="graphics">GDI+ 绘图图面</param>
/// <param name="rect">存储一组整数，共四个，表示一个矩形的位置和大小</param>
/// <param name="roundStyle">圆角的样式</param>
/// <param name="radius">圆角弧度大小</param>
/// <param name="borderColor">边框颜色</param>
public static void DrawBorder(Graphics graphics, Rectangle rect, AuroraRoundStyle roundStyle, int radius, Color borderColor)
{
if (rect.Width <= 0 || rect.Height <= 0 || graphics == null)
{
return;
}
rect.Width -= 2;
rect.Height -= 2;
using (GraphicsPath path = CreateGraphicsPath(rect, radius, roundStyle, false))
{
using (Pen pen = new Pen(borderColor))
{
graphics.DrawPath(pen, path);
}
}
}
/// <summary>
/// 创建指定样式的GraphicsPath
/// </summary>
/// <param name="rect">存储一组整数，共四个，表示一个矩形的位置和大小</param>
/// <param name="radius">圆角弧度大小</param>
/// <param name="roundStyle">圆角的样式</param>
/// <param name="correction">是否把矩形长宽减 1,以便画出边框</param>
/// <returns>建立的路径</returns>
public static GraphicsPath CreateGraphicsPath(Rectangle rect, int radius, AuroraRoundStyle roundStyle, bool correction = true)
{
GraphicsPath path = new GraphicsPath();
int radiusCorrection = correction ? 1 : 0;
switch (roundStyle)
{
case AuroraRoundStyle.None:
path.AddRectangle(rect);
break;
case AuroraRoundStyle.All:
path.AddArc(rect.X, rect.Y, radius, radius, 180, 90);
path.AddArc(rect.Right - radius - radiusCorrection, rect.Y, radius, radius, 270, 90);
path.AddArc(rect.Right - radius - radiusCorrection, rect.Bottom - radius - radiusCorrection, radius, radius, 0, 90);
path.AddArc(rect.X, rect.Bottom - radius - radiusCorrection, radius, radius, 90, 90);
break;
case AuroraRoundStyle.Left:
path.AddArc(rect.X, rect.Y, radius, radius, 180, 90);
path.AddLine(rect.Right - radiusCorrection, rect.Y, rect.Right - radiusCorrection, rect.Bottom - radiusCorrection);
path.AddArc(rect.X, rect.Bottom - radius - radiusCorrection, radius, radius, 90, 90);
break;
case AuroraRoundStyle.LeftTop:
path.AddArc(rect.X, rect.Y, radius, radius, 180, 90);
break;
case AuroraRoundStyle.LeftBottom:
path.AddArc(rect.X, rect.Bottom - radius - radiusCorrection, radius, radius, 90, 90);
break;
case AuroraRoundStyle.Right:
path.AddArc(rect.Right - radius - radiusCorrection, rect.Y, radius, radius, 270, 90);
path.AddArc(rect.Right - radius - radiusCorrection, rect.Bottom - radius - radiusCorrection, radius, radius, 0, 90);
path.AddLine(rect.X, rect.Bottom - radiusCorrection, rect.X, rect.Y);
break;
case AuroraRoundStyle.RightTop:
path.AddArc(rect.Right - radius - radiusCorrection, rect.Y, radius, radius, 270, 90);
break;
case AuroraRoundStyle.RightBottom:
path.AddArc(rect.Right - radius - radiusCorrection, rect.Bottom - radius - radiusCorrection, radius, radius, 0, 90);
break;
case AuroraRoundStyle.Top:
path.AddArc(rect.X, rect.Y, radius, radius, 180, 90);
path.AddArc(rect.Right - radius - radiusCorrection, rect.Y, radius, radius, 270, 90);
path.AddLine(rect.Right - radiusCorrection, rect.Bottom - radiusCorrection, rect.X, rect.Bottom - radiusCorrection);
break;
case AuroraRoundStyle.Bottom:
path.AddArc(rect.Right - radius - radiusCorrection, rect.Bottom - radius - radiusCorrection, radius, radius, 0, 90);
path.AddArc(rect.X, rect.Bottom - radius - radiusCorrection, radius, radius, 90, 90);
path.AddLine(rect.X, rect.Y, rect.Right - radiusCorrection, rect.Y);
break;
}
path.CloseFigure(); //这句很关键，缺少会没有左边线。
return(path);
}
/// <summary>
/// 绘制边框
/// </summary>
/// <param name="graphics">GDI+ 绘图图面</param>
/// <param name="rect">存储一组整数，共四个，表示一个矩形的位置和大小</param>
/// <param name="roundStyle">圆角的样式</param>
/// <param name="radius">圆角弧度大小</param>
public static void DrawBorder(Graphics graphics, Rectangle rect, AuroraRoundStyle roundStyle, int radius)
{
DrawBorder(graphics, rect, roundStyle, radius, Color.LightGray);
}
