ShareX/ShareX.ScreenCaptureLib/Shapes/Region/FreehandRegionShape.cs

#region License Information (GPL v3)

/*
    ShareX - A program that allows you to take screenshots and share any file type
    Copyright (c) 2007-2016 ShareX Team

    This program is free software; you can redistribute it and/or
    modify it under the terms of the GNU General Public License
    as published by the Free Software Foundation; either version 2
    of the License, or (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program; if not, write to the Free Software
    Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.

    Optionally you can also view the license at <http://www.gnu.org/licenses/>.
*/

#endregion License Information (GPL v3)

using ShareX.HelpersLib;
using System.Collections.Generic;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.Linq;

namespace ShareX.ScreenCaptureLib
{
    public class FreehandRegionShape : BaseRegionShape
    {
        public override ShapeType ShapeType { get; } = ShapeType.RegionFreehand;

        private List<Point> points = new List<Point>(128);

        public override void OnUpdate()
        {
            if (Manager.IsCreating)
            {
                if (points.Count == 0 || points.Last() != InputManager.MousePosition0Based)
                {
                    Point point = InputManager.MousePosition0Based;
                    points.Add(point);
                    Rectangle = Rectangle.AddPoint(point);
                }
            }
            else if (Manager.IsMoving)
            {
                for (int i = 0; i < points.Count; i++)
                {
                    points[i] = points[i].Add(InputManager.MouseVelocity.X, InputManager.MouseVelocity.Y);
                }

                Rectangle = Rectangle.LocationOffset(InputManager.MouseVelocity.X, InputManager.MouseVelocity.Y);
            }
        }

        public override void OnShapePathRequested(GraphicsPath gp, Rectangle rect)
        {
            if (points.Count > 1)
            {
                gp.StartFigure();

                for (int i = 0; i < points.Count - 1; i++)
                {
                    gp.AddLine(points[i], points[i + 1]);
                }

                if (points.Count > 2)
                {
                    gp.AddLine(points[points.Count - 1], points[0]);
                }

                gp.CloseFigure();
            }
        }
    }
}