C＃中的Graphics.DrawArc()方法与示例

Graphics.DrawArc方法用于绘制表示由一对坐标，宽度和高度指定的椭圆的一部分的圆弧。此方法的重载列表中有4种方法，如下所示：

• DrawArc(Pen，Rectangle，Single，Single)方法
• DrawArc(Pen，RectangleF，Single，Single)方法
• DrawArc(Pen，Int32，Int32，Int32，Int32，Int32，Int32)方法
• DrawArc(Pen，Single，Single，Single，Single，Single，Single)方法

DrawArc(笔，矩形，单，单)

此方法用于绘制表示由Rectangle结构指定的椭圆的一部分的弧。

Syntax: public void DrawArc (System.Drawing.Pen pen, System.Drawing.Rectangle rect, float startAngle, float sweepAngle)

Parameters:
pen: Determines the color, width, and style of the arc.
rect: Determines the smallest rectangle in which the ellipse just perfectly fits into.
startAngle: Angle in degrees measured clockwise from the x-axis to the starting point of the arc.
sweepAngle: Angle in degrees measured clockwise from the startAngle parameter to ending point of the arc.

异常：如果笔为null，则此方法将提供ArgumentNullException。

例子：

// C# program to illustrate the 
// DrawArc(Pen, Rectangle, Single,
// Single) Method
using System;
using System.Drawing;
using System.Drawing.Printing;
using System.Windows.Forms;
  
namespace GFG {
  
class PrintableForm : Form {
  
    // Main Method
    public static void Main()
    {
        Application.Run(new PrintableForm());
    }
    public PrintableForm()
    {
        ResizeRedraw = true;
    }
  
    protected override void OnPaint(PaintEventArgs e)
    {
        // Create pen.
        Pen blackPen = new Pen(Color.Black, 3);
  
        // Reactangle with specifies x1,
        // y1, x2, y2 respectively
        Rectangle rect = new Rectangle(0, 0, 100, 200);
  
        // Create start and sweep angles on ellipse.
        float startAngle = 45.0F;
        float sweepAngle = 270.0F;
  
        // Draw arc to screen.
        e.Graphics.DrawArc(blackPen, rect, 
                  startAngle, sweepAngle);
    }
}
}

输出：

DrawArc(Pen，RectangleF，Single，Single)

此方法用于绘制表示由RectangleF结构指定的椭圆的一部分的弧。

Syntax: public void DrawArc (System.Drawing.Pen pen, System.Drawing.RectangleF rect, float startAngle, float sweepAngle);

Parameters:
pen: Determines the color, width, and style of the arc.
rect: Determines the smallest rectangle in which the ellipse just perfectly fits into.
startAngle: Angle in degrees measured clockwise from the x-axis to the starting point of the arc.sweepAngle: Angle in degrees measured clockwise from the startAngle parameter to ending point of the arc.

异常：如果笔为null，则此方法将提供ArgumentNullException。

范例1：

// C# program to illustrate the 
// DrawArc(Pen, RectangleF, 
// Single, Single) Method
using System;
using System.Drawing;
using System.Drawing.Printing;
using System.Windows.Forms;
  
namespace GFG {
  
class PrintableForm : Form {
  
    // Main Method
    public static void Main()
    {
  
        Application.Run(new PrintableForm());
    }
  
    public PrintableForm()
    {
        ResizeRedraw = true;
    }
  
    protected override void OnPaint(PaintEventArgs e)
    {
        // Create pen
        Pen blackPen = new Pen(Color.Black, 3);
  
        // Reactangle with specifies x1,
        // y1, x2, y2 respectively
        RectangleF rect = new RectangleF(0.0F, 
                        0.0F, 100.0F, 200.0F);
  
        // Create start and sweep
        // angles on an ellipse.
        float startAngle = 45.0F;
        float sweepAngle = 270.0F;
  
        // Draw arc to screen.
        e.Graphics.DrawArc(blackPen, rect,
                  startAngle, sweepAngle);
    }
}
}

输出：

DrawArc(笔，单，单，单，单，单，单)

此方法用于绘制表示由一对坐标，宽度和高度指定的椭圆的一部分的圆弧。

Syntax: public void DrawArc (System.Drawing.Pen pen, float x, float y, float width, float height, float startAngle, float sweepAngle);

Parameters:
pen: Pen determines the color, width, and style of the line.
x: The abscissa of the upper-left corner of the rectangle that defines the ellipse.
y: The ordinate of the upper-left corner of the rectangle that defines the ellipse.
width: Width of the rectangle that defines the ellipse or more specifically we can say the diameter of the ellipse in abscissa.
height: Height of the rectangle that defines the ellipse or more specifically we can say the diameter of the ellipse in ordinate.
startAngle: Angle in degrees measured clockwise from the x-axis to the starting point of the arc.
sweepAngle: Angle in degrees measured clockwise from the startAngle parameter to the ending point of the arc.

异常：如果笔为null，则此方法将提供ArgumentNullException。

范例1：

// C# program to draw a circle
using System;
using System.Drawing;
using System.Drawing.Printing;
using System.Windows.Forms;
  
namespace GFG {
  
class PrintableForm : Form {
  
    // Main Method
    public static void Main()
    {
        Application.Run(new PrintableForm());
    }
  
    public PrintableForm()
    {
        ResizeRedraw = true;
    }
  
    protected override void OnPaint(PaintEventArgs e)
    {
        // Create pen.
        Pen blackPen = new Pen(Color.Black, 3);
  
        // Create coordinates of the rectangle
        // to the bound ellipse.
        int x = 0;
        int y = 0;
        int width = 100;
        int height = 200;
  
        // Create start and sweep 
        // angles on ellipse.
        int startAngle = 0;
        int sweepAngle = 360;
  
        // Draw arc to screen.
        e.Graphics.DrawArc(blackPen, x, y, width,
                 height, startAngle, sweepAngle);
    }
}
}

输出：

范例2：

// C# program to draw GFG
using System;
using System.Drawing;
using System.Drawing.Printing;
using System.Windows.Forms;
  
namespace GFG {
  
class PrintableForm : Form {
  
    // Main Method
    public static void Main()
    {
        Application.Run(new PrintableForm());
    }
  
    public PrintableForm()
    {
        ResizeRedraw = true;
    }
  
    protected override void OnPaint(PaintEventArgs e)
    {
        // Create pen.
        Pen blackPen = new Pen(Color.Black, 3);
  
        // Creates letter G
        e.Graphics.DrawArc(blackPen, 10,
                  10, 100, 200, 0, 315);
  
        e.Graphics.DrawLine(blackPen,
                  60, 110, 110, 110);
  
        // Creates letter F
        e.Graphics.DrawLine(blackPen,
                  130, 10, 130, 210);
  
        e.Graphics.DrawLine(blackPen,
                   130, 10, 200, 10);
  
        e.Graphics.DrawLine(blackPen, 
                 130, 110, 170, 110);
  
        // Creates the next letter G
        e.Graphics.DrawArc(blackPen,
         210, 10, 100, 200, 0, 315);
  
        e.Graphics.DrawLine(blackPen,
                 260, 110, 310, 110);
    }
}
}

输出：

DrawArc(Pen，Int32，Int32，Int32，Int32，Int32，Int32)

此方法用于绘制表示由一对坐标，宽度和高度指定的椭圆的一部分的圆弧。

Syntax: public void DrawArc (System.Drawing.Pen pen, int x, int y, int width, int height, int startAngle, int sweepAngle);

Parameters:
pen: Pen determines the color, width, and style of the line.
x: The abscissa of the upper-left corner of the rectangle that defines the ellipse.
y: The ordinate of the upper-left corner of the rectangle that defines the ellipse.
width: Width of the rectangle that defines the ellipse or more specifically we can say the diameter of the ellipse in abscissa.
height: Height of the rectangle that defines the ellipse or more specifically we can say the diameter of the ellipse inordinate.
startAngle: Angle in degrees measured clockwise from the x-axis to the starting point of the arc.
sweepAngle: Angle in degrees measured clockwise from the startAngle parameter to ending point of the arc.

异常：如果笔为null，则此方法将提供ArgumentNullException。

例子：

// C# program to draw a circle
using System;
using System.Drawing;
using System.Drawing.Printing;
using System.Windows.Forms;
  
namespace GFG {
  
class PrintableForm : Form {
  
    // Main Method
    public static void Main()
    {
        Application.Run(new PrintableForm());
    }
    public PrintableForm()
    {
        ResizeRedraw = true;
    }
    protected override void OnPaint(PaintEventArgs e)
    {
        // Create pen.
        Pen blackPen = new Pen(Color.Black, 3);
  
        // Create coordinates of the rectangle
        // to the bound ellipse.
        float x = 0.0F;
        float y = 0.0F;
        float width = 100.0F;
        float height = 200.0F;
  
        // Create start and sweep
        // angles on the ellipse.
        float startAngle = 0.0F;
        float sweepAngle = 360.0F;
  
        // Draw arc to screen.
        e.Graphics.DrawArc(blackPen, x, y, width,
                 height, startAngle, sweepAngle);
    }
}
}

输出：

参考：

• https://docs.microsoft.com/zh-cn/dotnet/api/system.drawing.graphics.drawarc?view=netframework-4.7.2