根据输入坐标绘制多边形

Question

如何根据C＃中给出的输入坐标绘制多边形。

Answer 1

，因为根据这些坐标，你申请某种形式扩展到图像的你没有表现出任何代码。

使用PictureBox的Paint事件，这里是一个在屏幕上使用这些坐标的例子。它填补了多边形，然后绘制边框，然后它遍历所有的点来绘制红色圆圈：

void pictureBox1_Paint(object sender, PaintEventArgs e) { 
    e.Graphics.SmoothingMode = SmoothingMode.AntiAlias; 
    e.Graphics.Clear(Color.White); 

    // draw the shading background: 
    List<Point> shadePoints = new List<Point>(); 
    shadePoints.Add(new Point(0, pictureBox1.ClientSize.Height)); 
    shadePoints.Add(new Point(pictureBox1.ClientSize.Width, 0)); 
    shadePoints.Add(new Point(pictureBox1.ClientSize.Width, 
          pictureBox1.ClientSize.Height)); 
    e.Graphics.FillPolygon(Brushes.LightGray, shadePoints.ToArray()); 

    // scale the drawing larger: 
    using (Matrix m = new Matrix()) { 
    m.Scale(4, 4); 
    e.Graphics.Transform = m; 

    List<Point> polyPoints = new List<Point>(); 
    polyPoints.Add(new Point(10, 10)); 
    polyPoints.Add(new Point(12, 35)); 
    polyPoints.Add(new Point(22, 35)); 
    polyPoints.Add(new Point(24, 22)); 

    // use a semi-transparent background brush: 
    using (SolidBrush br = new SolidBrush(Color.FromArgb(100, Color.Yellow))) { 
     e.Graphics.FillPolygon(br, polyPoints.ToArray()); 
    } 
    e.Graphics.DrawPolygon(Pens.DarkBlue, polyPoints.ToArray()); 

    foreach (Point p in polyPoints) { 
     e.Graphics.FillEllipse(Brushes.Red, 
          new Rectangle(p.X - 2, p.Y - 2, 4, 4)); 
    } 
    } 
} 

Answer 2

您可以使用Graphics.DrawPolygon。您可以将坐标存储在Point数组中，然后将其传递给DrawPolygon方法。你可能想看看：

Drawing with Graphics in WinForms using C#

private System.Drawing.Graphics g; 
System.Drawing.Point[] p = new System.Drawing.Point[6]; 
p[0].X = 0; 
p[0].Y = 0; 
p[1].X = 53; 
p[1].Y = 111; 
p[2].X = 114; 
p[2].Y = 86; 
p[3].X = 34; 
p[3].Y = 34; 
p[4].X = 165; 
p[4].Y = 7; 
g = PictureBox1.CreateGraphics(); 
g.DrawPolygon(pen1, p);