C# GraphicsPath.AddArc方法代碼示例

 // paramters:
 //      pen 繪製邊框。可以為null，那樣就整體一個填充色，沒有邊框
 //      brush   繪製填充色。可以為null，那樣就隻有邊框
 public static void RoundRectangle(Graphics graphics,
     Pen pen,
     Brush brush,
     float x,
     float y,
     float width,
     float height,
     float radius)
 {
     using (GraphicsPath path = new GraphicsPath())
     {
         path.AddLine(x + radius, y, x + width - (radius * 2), y);
         path.AddArc(x + width - (radius * 2), y, radius * 2, radius * 2, 270, 90);
         path.AddLine(x + width, y + radius, x + width, y + height - (radius * 2));
         path.AddArc(x + width - (radius * 2), y + height - (radius * 2), radius * 2, radius * 2, 0, 90); // Corner
         path.AddLine(x + width - (radius * 2), y + height, x + radius, y + height);
         path.AddArc(x, y + height - (radius * 2), radius * 2, radius * 2, 90, 90);
         path.AddLine(x, y + height - (radius * 2), x, y + radius);
         path.AddArc(x, y, radius * 2, radius * 2, 180, 90);
         path.CloseFigure();
         if (brush != null)
             graphics.FillPath(brush, path);
         if (pen != null)
             graphics.DrawPath(pen, path);
     }
 }

		private CustomLineCap GetClone(Pen pen, float size)
		{
			float endPoint;
			endPoint = pen.Width == 0 ? 1 : size / pen.Width;
			endPoint /= 2;
			if (endPoint <= 0)
				endPoint = 1e-3f;

			GraphicsPath hPath = new GraphicsPath();

			var r = endPoint / (2 * Math.Sin(_designAngle * (Math.PI / 180)));
			var b = r - r * Math.Cos(_designAngle * (Math.PI / 180));
			var h = endPoint / 2;

			// Create the outline for our custom end cap.

			hPath.AddArc(
				(float)(-r - h), (float)(-b),
				(float)(2 * r), (float)(2 * r),
				(float)(-90 - _designAngle), (float)(2 * _designAngle));

			hPath.AddArc(
				(float)(h - r), (float)(b - 1.999999 * r),
				(float)(2 * r), (float)(2 * r),
				(float)(90 + _designAngle), (float)(-2 * _designAngle));

			CustomLineCap clone = new CustomLineCap(null, hPath); // we set the stroke path only
			clone.SetStrokeCaps(LineCap.Flat, LineCap.Flat);
			return clone;
		}

        public void DrawRoundRect(Graphics g, Pen p, float X, float Y, float width, float height, float radius)
        {
            Y+=5;
            X+=5;
            width -= 12;
            height -= 12;
            GraphicsPath gp = new GraphicsPath();
            gp.AddLine(X + radius, Y, X + width - (radius * 2), Y);
            gp.AddArc(X + width - (radius * 2), Y, radius * 2, radius * 2, 270, 90);
            gp.AddLine(X + width, Y + radius, X + width, Y + height - (radius * 2));
            gp.AddArc(X + width - (radius * 2), Y + height - (radius * 2), radius * 2, radius * 2, 0, 90);
            gp.AddLine(X + width - (radius * 2), Y + height, X + radius, Y + height);
            gp.AddArc(X, Y + height - (radius * 2), radius * 2, radius * 2, 90, 90);
            gp.AddLine(X, Y + height - (radius * 2), X, Y + radius);
            gp.AddArc(X, Y, radius * 2, radius * 2, 180, 90);
            gp.CloseFigure();
            g.FillPath(Brushes.Transparent, gp);
            gp.Dispose();

            gp = new GraphicsPath();
            gp.AddLine(X + radius, Y, X + width - (radius * 2), Y);
            gp.AddArc(X + width - (radius * 2), Y, radius * 2, radius * 2, 270, 90);
            gp.AddLine(X + width, Y + radius, X + width, Y + height - (radius * 2));
            gp.AddArc(X + width - (radius * 2), Y + height - (radius * 2), radius * 2, radius * 2, 0, 90);
            gp.AddLine(X + width - (radius * 2), Y + height, X + radius, Y + height);
            gp.AddArc(X, Y + height - (radius * 2), radius * 2, radius * 2, 90, 90);
            gp.AddLine(X, Y + height - (radius * 2), X, Y + radius);
            gp.AddArc(X, Y, radius * 2, radius * 2, 180, 90);
            gp.CloseFigure();
            g.DrawPath(p, gp);
            gp.Dispose();
        }

        public static void DrawArc(Rectangle re, GraphicsPath pa, int radius, EGroupPos _grouppos)
        {
            int radiusX0Y0 = radius,
                radiusXfy0 = radius,
                radiusX0Yf = radius,
                radiusXfyf = radius;

            switch (_grouppos)
            {
                case EGroupPos.Left:
                    radiusXfy0 = 1; radiusXfyf = 1;
                    break;
                case EGroupPos.Center:
                    radiusX0Y0 = 1; radiusX0Yf = 1; radiusXfy0 = 1; radiusXfyf = 1;
                    break;
                case EGroupPos.Right:
                    radiusX0Y0 = 1; radiusX0Yf = 1;
                    break;
                case EGroupPos.Top:
                    radiusX0Yf = 1; radiusXfyf = 1;
                    break;
                case EGroupPos.Bottom:
                    radiusX0Y0 = 1; radiusXfy0 = 1;
                    break;
            }
            pa.AddArc(re.X, re.Y, radiusX0Y0, radiusX0Y0, 180, 90);
            pa.AddArc(re.Width - radiusXfy0, re.Y, radiusXfy0, radiusXfy0, 270, 90);
            pa.AddArc(re.Width - radiusXfyf, re.Height - radiusXfyf, radiusXfyf, radiusXfyf, 0, 90);
            pa.AddArc(re.X, re.Height - radiusX0Yf, radiusX0Yf, radiusX0Yf, 90, 90);
            pa.CloseFigure();
        }

        protected override void OnPaint(PaintEventArgs e)
        {
            base.OnPaint(e);

            Graphics G = e.Graphics;
            LinearGradientBrush linearGradientBrush1 = new LinearGradientBrush(//創建線性漸變畫刷
            new Point(0, 0),new Point(20, 20),                  //漸變起始點和終止點
            Color.Yellow,Color.Blue);                           //漸變起始顏色和終止顏色
            G.FillRectangle(linearGradientBrush1, new Rectangle(0, 0, 150, 150));//繪製矩形
            LinearGradientBrush linearGradientBrush2 = new LinearGradientBrush(//創建線性漸變畫刷
            new Rectangle(0, 0, 20, 20),                      //漸變所在矩形
            Color.Yellow, Color.Blue, 60f);                     //漸變起始顏色、終止顏色以及漸變方向
            linearGradientBrush2.WrapMode = WrapMode.TileFlipXY;
            G.FillRectangle(linearGradientBrush2, new Rectangle(150, 0, 150, 150));//繪製矩形

            GraphicsPath graphicsPath1 = new GraphicsPath();        //創建繪製路徑
            graphicsPath1.AddArc(new Rectangle(0, 150, 100, 100), 90, 180);//向路徑中添加半左圓弧
            graphicsPath1.AddArc(new Rectangle(150, 150, 100, 100), 270, 180);//向路徑中添加半右圓弧
            graphicsPath1.CloseFigure();                            //閉合路徑
            PathGradientBrush pathGradientBrush = new PathGradientBrush(graphicsPath1);//創建路徑漸變畫刷
            pathGradientBrush.CenterColor = Color.Yellow;           //指定畫刷中心顏色
            pathGradientBrush.SurroundColors = new Color[] { Color.Blue };//指定畫刷周邊顏色
            pathGradientBrush.CenterPoint = new PointF(125, 200);   //指定畫刷中心點坐標
            G.SmoothingMode = SmoothingMode.AntiAlias;              //消鋸齒
            G.FillPath(pathGradientBrush, graphicsPath1);           //利用畫刷填充路徑
            G.DrawPath(new Pen(Color.Lime, 3f), graphicsPath1);     //繪製閉合路徑曲線

            linearGradientBrush1.Dispose();
            linearGradientBrush2.Dispose();
            graphicsPath1.Dispose();
            pathGradientBrush.Dispose();
        }

        // Create a rounded rectangle path with a given Rectangle and a given corner Diameter
        public static GraphicsPath CreateRoundedRectanglePath(Rectangle rect, float diameter)
        {
            GraphicsPath path = new GraphicsPath ();
            RectangleF arcrect = new RectangleF (rect.Location, new SizeF (diameter, diameter));

            // Top left arc
            path.AddArc (arcrect, 190, 90);
            path.AddLine (rect.Left + (int)(diameter / 2), rect.Top, rect.Left + rect.Width  - (int)(diameter / 2), rect.Top);

            // Top right arc
            arcrect.X = rect.Right - diameter;
            path.AddArc (arcrect, 270, 90);
            path.AddLine (rect.Left + rect.Width, rect.Top + (int)(diameter / 2), rect.Left + rect.Width, rect.Top + rect.Height - (int)(diameter / 2));

            // Bottom right arc
            arcrect.Y = rect.Bottom - diameter;
            path.AddArc (arcrect, 0, 90);

            // Bottom left arc
            arcrect.X = rect.Left;
            path.AddArc (arcrect, 90, 90);

            path.CloseFigure ();
            return path;
        }

        public GraphicsPath CreateCompleteTabPath(Rectangle r)
        {
            GraphicsPath path = new GraphicsPath();
            int corner = 6;
            int rightOffset = 1;

            path.AddLine(
                r.Left, r.Bottom,
                r.Left, r.Top + corner);
            path.AddArc(
                new Rectangle(
                r.Left, r.Top,
                corner, corner),
                180, 90);
            path.AddLine(
                r.Left + corner, r.Top,
                r.Right - corner - rightOffset, r.Top);
            path.AddArc(
                new Rectangle(
                r.Right - corner - rightOffset, r.Top,
                corner, corner),
                -90, 90);
            path.AddLine(
                r.Right - rightOffset, r.Top + corner,
                r.Right - rightOffset, r.Bottom);

            path.CloseFigure();

            return path;
        }

        public static GraphicsPath CreateRoundedRectangle(SizeF size, PointF location)
        {
            int cornerSize			= (int)GraphConstants.CornerSize * 2;
            int connectorSize		= (int)GraphConstants.ConnectorSize;
            int halfConnectorSize	= (int)Math.Ceiling(connectorSize / 2.0f);

            var height				= size.Height;
            var width				= size.Width;
            var halfWidth			= width / 2.0f;
            var halfHeight			= height / 2.0f;
            var connectorOffset		= (int)Math.Floor((GraphConstants.MinimumItemHeight - GraphConstants.ConnectorSize) / 2.0f);
            var left				= location.X;
            var top					= location.Y;
            var right				= location.X + width;
            var bottom				= location.Y + height;

            var path = new GraphicsPath(FillMode.Winding);
            path.AddArc(left, top, cornerSize, cornerSize, 180, 90);
            path.AddArc(right - cornerSize, top, cornerSize, cornerSize, 270, 90);

            path.AddArc(right - cornerSize, bottom - cornerSize, cornerSize, cornerSize, 0, 90);
            path.AddArc(left, bottom - cornerSize, cornerSize, cornerSize, 90, 90);
            path.CloseFigure();
            return path;
        }

 /// <summary>
 /// 圓角代碼
 /// </summary>
 public void Round()
 {
     GraphicsPath oPath = new GraphicsPath();
     const int x = 0;
     const int y = 0;
     int thisWidth = this.Width;
     int thisHeight = this.Height;
     int angle = _radius;
     if (angle > 0)
     {
         oPath.AddArc(x, y, angle, angle, 180, 90);                                 // 左上角
         oPath.AddArc(thisWidth - angle, y, angle, angle, 270, 90);                 // 右上角
         oPath.AddArc(thisWidth - angle, thisHeight - angle, angle, angle, 0, 90);  // 右下角
         oPath.AddArc(x, thisHeight - angle, angle, angle, 90, 90);                 // 左下角
         oPath.CloseAllFigures();
         Region = new System.Drawing.Region(oPath);
     }
     else
     {
         oPath.AddLine(x + angle, y, thisWidth - angle, y);                         // 頂端
         oPath.AddLine(thisWidth, y + angle, thisWidth, thisHeight - angle);        // 右邊
         oPath.AddLine(thisWidth - angle, thisHeight, x + angle, thisHeight);       // 底邊
         oPath.AddLine(x, y + angle, x, thisHeight - angle);                        // 左邊
         oPath.CloseAllFigures();
         Region = new System.Drawing.Region(oPath);
     }
 }

 /// <summary>
 /// Draws a rounded rectangle on a bitmap
 /// </summary>
 /// <param name="Image">Image to draw on</param>
 /// <param name="BoxColor">The color that the box should be</param>
 /// <param name="XPosition">The upper right corner's x position</param>
 /// <param name="YPosition">The upper right corner's y position</param>
 /// <param name="Height">Height of the box</param>
 /// <param name="Width">Width of the box</param>
 /// <param name="CornerRadius">Radius of the corners</param>
 /// <returns>The bitmap with the rounded box on it</returns>
 public static Bitmap DrawRoundedRectangle(Bitmap Image, Color BoxColor, int XPosition, int YPosition,
     int Height, int Width, int CornerRadius)
 {
     Bitmap NewBitmap = new Bitmap(Image, Image.Width, Image.Height);
     using (Graphics NewGraphics = Graphics.FromImage(NewBitmap))
     {
         using (Pen BoxPen = new Pen(BoxColor))
         {
             using (GraphicsPath Path = new GraphicsPath())
             {
                 Path.AddLine(XPosition + CornerRadius, YPosition, XPosition + Width - (CornerRadius * 2), YPosition);
                 Path.AddArc(XPosition + Width - (CornerRadius * 2), YPosition, CornerRadius * 2, CornerRadius * 2, 270, 90);
                 Path.AddLine(XPosition + Width, YPosition + CornerRadius, XPosition + Width, YPosition + Height - (CornerRadius * 2));
                 Path.AddArc(XPosition + Width - (CornerRadius * 2), YPosition + Height - (CornerRadius * 2), CornerRadius * 2, CornerRadius * 2, 0, 90);
                 Path.AddLine(XPosition + Width - (CornerRadius * 2), YPosition + Height, XPosition + CornerRadius, YPosition + Height);
                 Path.AddArc(XPosition, YPosition + Height - (CornerRadius * 2), CornerRadius * 2, CornerRadius * 2, 90, 90);
                 Path.AddLine(XPosition, YPosition + Height - (CornerRadius * 2), XPosition, YPosition + CornerRadius);
                 Path.AddArc(XPosition, YPosition, CornerRadius * 2, CornerRadius * 2, 180, 90);
                 Path.CloseFigure();
                 NewGraphics.DrawPath(BoxPen, Path);
             }
         }
     }
     return NewBitmap;
 }

        public static void DrawRoundedRectangle(Graphics newGraphics, Color boxColor, Color gradFillColor1, Color gradFillColor2, int xPosition, int yPosition,
                   int height, int width, int cornerRadius)
        {
            using (var boxPen = new Pen(boxColor))
            {
                using (var path = new GraphicsPath())
                {
                    path.AddLine(xPosition + cornerRadius, yPosition, xPosition + width - (cornerRadius * 2), yPosition);
                    path.AddArc(xPosition + width - (cornerRadius * 2), yPosition, cornerRadius * 2, cornerRadius * 2, 270, 90);
                    path.AddLine(xPosition + width, yPosition + cornerRadius, xPosition + width,
                                 yPosition + height - (cornerRadius * 2));
                    path.AddArc(xPosition + width - (cornerRadius * 2), yPosition + height - (cornerRadius * 2), cornerRadius * 2,
                                cornerRadius * 2, 0, 90);
                    path.AddLine(xPosition + width - (cornerRadius * 2), yPosition + height, xPosition + cornerRadius,
                                 yPosition + height);
                    path.AddArc(xPosition, yPosition + height - (cornerRadius * 2), cornerRadius * 2, cornerRadius * 2, 90, 90);
                    path.AddLine(xPosition, yPosition + height - (cornerRadius * 2), xPosition, yPosition + cornerRadius);
                    path.AddArc(xPosition, yPosition, cornerRadius * 2, cornerRadius * 2, 180, 90);
                    path.CloseFigure();
                    newGraphics.DrawPath(boxPen, path);

                    var b = new LinearGradientBrush(new Point(xPosition, yPosition),
                                                    new Point(xPosition + width, yPosition + height), gradFillColor1,
                                                    gradFillColor2);

                    newGraphics.FillPath(b, path);
                }
            }
        }

		private static GraphicsPath GenerateCapsule( this Graphics graphics, RectangleF rectangle ) {
			float diameter;
			RectangleF arc;
			GraphicsPath path = new GraphicsPath();

			try {
				if( rectangle.Width > rectangle.Height ) {
					diameter = rectangle.Height;
					SizeF sizeF = new SizeF( diameter, diameter );
					arc = new RectangleF( rectangle.Location, sizeF );
					path.AddArc( arc, 90, 180 );
					arc.X = rectangle.Right - diameter;
					path.AddArc( arc, 270, 180 );
				} else if( rectangle.Width < rectangle.Height ) {
					diameter = rectangle.Width;
					SizeF sizeF = new SizeF( diameter, diameter );
					arc = new RectangleF( rectangle.Location, sizeF );
					path.AddArc( arc, 180, 180 );
					arc.Y = rectangle.Bottom - diameter;
					path.AddArc( arc, 0, 180 );
				} else
					path.AddEllipse( rectangle );
			} catch { path.AddEllipse( rectangle ); } finally { path.CloseFigure(); }
			return path;
		}

        public static GraphicsPath CreateRoundedRectanglePath(RectangleF rect, float radius)
        {
            GraphicsPath path = new GraphicsPath();

            if (rect.Width <= 0.0f || rect.Height <= 0.0f) return path;

            float x1 = rect.X;
            float x2 = rect.X + rect.Width;
            float y1 = rect.Y;
            float y2 = rect.Y + rect.Height;

            if (radius > rect.Width / 2) radius = rect.Width / 2;
            if (radius > rect.Height / 2) radius = rect.Width / 2;

            // Top left arc and top edge:
            if (radius > 0.0) path.AddArc(new RectangleF(x1, y1, radius * 2, radius * 2), 180, 90);
            path.AddLine(x1 + radius, y1, x2 - radius, y1);

            // Top right arc and right edge:
            if (radius > 0.0) path.AddArc(new RectangleF(x2 - radius * 2, y1, radius * 2, radius * 2), 270, 90);
            path.AddLine(x2, y1 + radius, x2, y2 - radius);

            // Bottom right arc and bottom edge:
            if (radius > 0.0) path.AddArc(new RectangleF(x2 - radius * 2, y2 - radius * 2, radius * 2, radius * 2), 0, 90);
            path.AddLine(x2 - radius, y2, x1 + radius, y2);

            // Bottom left arc and left edge:
            if (radius > 0.0) path.AddArc(new RectangleF(x1, y2 - radius * 2, radius * 2, radius * 2), 90, 90);
            path.AddLine(x1, y2 - radius, x1, y1 + radius);

            return path;
        }

        private void Form1_Paint(object sender, PaintEventArgs e)
        {
            Graphics g = e.Graphics;

            //Создаем массив точек
            Point[] points = {
                    new Point(5, 10),
                    new Point(23, 130),
                    new Point(130, 57)};

            GraphicsPath path = new GraphicsPath();
            //рисуем первую траекторию
            path.StartFigure();
            path.AddEllipse(170, 170, 100, 50);
            // заливаем траекторию цветом
            g.FillPath(Brushes.Aqua, path);
            //рисуем вторую траекторию
            path.StartFigure();
            path.AddCurve(points, 0.5F);
            path.AddArc(100, 50, 100, 100, 0, 120);
            path.AddLine(50, 150, 50, 220);
            // Закрываем траекторию
            path.CloseFigure();
            //рисуем четвертую траекторию
            path.StartFigure();
            path.AddArc(180, 30, 60, 60, 0, -170);

            g.DrawPath(new Pen(Color.Blue, 3), path);
            g.Dispose();
        }

        public override void Draw(Graphics g)
        {
            System.Drawing.Size st = g.MeasureString(Marker.ToolTipText, Font).ToSize();
             System.Drawing.Rectangle rect = new System.Drawing.Rectangle(Marker.ToolTipPosition.X, Marker.ToolTipPosition.Y - st.Height, st.Width + TextPadding.Width, st.Height + TextPadding.Height);
             rect.Offset(Offset.X, Offset.Y);

             using(GraphicsPath objGP = new GraphicsPath())
             {
            objGP.AddLine(rect.X + 2 * Radius, rect.Y + rect.Height, rect.X + Radius, rect.Y + rect.Height + Radius);
            objGP.AddLine(rect.X + Radius, rect.Y + rect.Height + Radius, rect.X + Radius, rect.Y + rect.Height);

            objGP.AddArc(rect.X, rect.Y + rect.Height - (Radius * 2), Radius * 2, Radius * 2, 90, 90);
            objGP.AddLine(rect.X, rect.Y + rect.Height - (Radius * 2), rect.X, rect.Y + Radius);
            objGP.AddArc(rect.X, rect.Y, Radius * 2, Radius * 2, 180, 90);
            objGP.AddLine(rect.X + Radius, rect.Y, rect.X + rect.Width - (Radius * 2), rect.Y);
            objGP.AddArc(rect.X + rect.Width - (Radius * 2), rect.Y, Radius * 2, Radius * 2, 270, 90);
            objGP.AddLine(rect.X + rect.Width, rect.Y + Radius, rect.X + rect.Width, rect.Y + rect.Height - (Radius * 2));
            objGP.AddArc(rect.X + rect.Width - (Radius * 2), rect.Y + rect.Height - (Radius * 2), Radius * 2, Radius * 2, 0, 90); // Corner

            objGP.CloseFigure();

            g.FillPath(Fill, objGP);
            g.DrawPath(Stroke, objGP);
             }

            #if !PocketPC
             g.DrawString(Marker.ToolTipText, Font, Brushes.Navy, rect, Format);
            #else
             g.DrawString(ToolTipText, ToolTipFont, TooltipForeground, rect, ToolTipFormat);
            #endif
        }