Drag and drop shape


   

using System.Drawing;
using System.Drawing.Drawing2D;
using System.Windows.Forms;

public class TryMouse : Form {
  private Region region; 
  private int oldX = 0;
  private int oldY = 0;

  public TryMouse() {
    Size = new Size(300,200);
    BackColor = Color.White;
    GraphicsPath p = new GraphicsPath();
    p.AddPolygon(new Point[]{new Point(50,10), new Point(10,50), new Point(150,100)});
    region = new Region(p);
  }

  protected override void OnPaint(PaintEventArgs e) {
    Graphics g = e.Graphics;
    g.FillRegion(Brushes.Red, region);
    base.OnPaint(e);
  }

  protected override void OnMouseDown(MouseEventArgs e) {
    if (region.GetBounds(CreateGraphics()).Contains(e.X, e.Y)){
      oldX = e.X;
      oldY = e.Y;
    }
    base.OnMouseDown(e);
  }

  protected override void OnMouseUp(MouseEventArgs e) {
    region.Translate(e.X-oldX, e.Y-oldY);
    oldX = e.X;
    oldY = e.Y;
    Invalidate();
    base.OnMouseUp(e);
  }
  public static void Main() {
    Application.Run(new TryMouse());
  }
}

           
          


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