Csharp/CSharp Tutorial/2D/Path

Close a figure and Create another figure

using System;
using System.Collections.Generic;
using System.ruponentModel;
using System.Data;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.Text;
using System.Windows.Forms;
public class Form1 : Form {
    protected override void OnPaint(PaintEventArgs e) {
    Graphics g = e.Graphics;
    g.FillRectangle(Brushes.White, this.ClientRectangle);
    GraphicsPath gp = new GraphicsPath();
    gp.AddLine(10, 10, 10, 50);
    gp.AddBezier(10, 50, 10, 55, 25, 70, 30, 70);
    gp.CloseFigure();
    gp.StartFigure();
    gp.AddLine(60, 110, 40, 160);
    g.DrawPath(Pens.Black, gp);
    gp.Dispose();
    }
    public static void Main() {
        Application.Run(new Form1());
    }
}

Draw Path and get mouse click

using System;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.Collections;
using System.ruponentModel;
using System.Windows.Forms;
using System.Data;
public class DrawPathMouseClick : System.Windows.Forms.Form
{
  private System.ruponentModel.Container components = null;
  GraphicsPath myPath = new GraphicsPath();
  private bool isImageClicked = false;
  private int imageClickedIndex;
  public DrawPathMouseClick()
  {
    InitializeComponent();
    myPath.StartFigure();
    myPath.AddLine(new Point(150, 10), new Point(120, 150));
    myPath.AddArc(200, 200, 100, 100, 0, 90);
    Point point1 = new Point(250, 250);
    Point point2 = new Point(350, 275);
    Point point3 = new Point(350, 325);
    Point point4 = new Point(250, 350);
    Point[] points = {point1, point2, point3, point4};
    myPath.AddCurve(points);
    myPath.CloseFigure();
  }
  protected override void Dispose( bool disposing )
  {
    if( disposing )
    {
      if (components != null) 
      {
        components.Dispose();
      }
    }
    base.Dispose( disposing );
  }
  private void InitializeComponent()
  {
    this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
    this.ClientSize = new System.Drawing.Size(376, 361);
    this.MouseUp += new System.Windows.Forms.MouseEventHandler(this.DrawPathMouseClick_MouseUp);
    this.Paint += new System.Windows.Forms.PaintEventHandler(this.DrawPathMouseClick_Paint);
  }
  [STAThread]
  static void Main() 
  {
    Application.Run(new DrawPathMouseClick());
  }
  private void DrawPathMouseClick_MouseUp(object sender, System.Windows.Forms.MouseEventArgs e)
  {
    Point mousePt = new Point(e.X, e.Y);
    if(myPath.IsVisible(mousePt))
    {
      isImageClicked = true;
      imageClickedIndex = 3;
    }
    else
    {
      isImageClicked = false;
    }
    Invalidate();
  }
  private void DrawPathMouseClick_Paint(object sender, System.Windows.Forms.PaintEventArgs e)
  {
    Graphics g = e.Graphics;
    g.FillPath(Brushes.RoyalBlue, myPath);
    if(isImageClicked == true)
    {
      Pen outline = new Pen(Color.Purple, 5);
      switch(imageClickedIndex)
      {
        case 3:
          g.DrawPath(outline, myPath);
          break;
        default:
          break;
      }
    }      
  }
}

GraphicsPath.CloseFigure

using System;
using System.Collections.Generic;
using System.ruponentModel;
using System.Data;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.Text;
using System.Windows.Forms;
public class Form1 : Form {
    protected override void OnPaint(PaintEventArgs e) {
    Graphics g = e.Graphics;
    GraphicsPath gp = new GraphicsPath();
    gp.AddLine(10, 10, 110, 15);
    gp.AddLine(110, 15, 100, 96);
    gp.AddLine(100, 96, 15, 110);
    gp.CloseFigure();
    g.FillRectangle(Brushes.White, this.ClientRectangle);
    g.DrawPath(Pens.Black, gp);
    gp.Dispose();
    }
    public static void Main() {
        Application.Run(new Form1());
    }
}