ShareX/GreenshotImageEditor/Drawing/RoundedRectangle.cs

/*
 * Greenshot - a free and open source screenshot tool
 * Copyright (C) 2007-2013  Thomas Braun, Jens Klingen, Robin Krom
 *
 * For more information see: http://getgreenshot.org/
 * The Greenshot project is hosted on Sourceforge: http://sourceforge.net/projects/greenshot/
 *
 * 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 1 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, see <http://www.gnu.org/licenses/>.
 */

using System.Drawing;
using System.Drawing.Drawing2D;

namespace Greenshot.Drawing
{
    public abstract class RoundedRectangle
    {
        public enum RectangleCorners
        {
            None = 0, TopLeft = 1, TopRight = 2,
            BottomLeft = 4, BottomRight = 8,
            All = TopLeft | TopRight | BottomLeft | BottomRight
        }

        public static GraphicsPath Create2(int x, int y, int width, int height, int radius)
        {
            GraphicsPath gp = new GraphicsPath();
            gp.AddLine(x + radius, y, x + width - (radius * 2), y); // Line
            gp.AddArc(x + width - (radius * 2), y, radius * 2, radius * 2, 270, 90); // Corner
            gp.AddLine(x + width, y + radius, x + width, y + height - (radius * 2)); // Line
            gp.AddArc(x + width - (radius * 2), y + height - (radius * 2), radius * 2, radius * 2, 0, 90); // Corner
            gp.AddLine(x + width - (radius * 2), y + height, x + radius, y + height); // Line
            gp.AddArc(x, y + height - (radius * 2), radius * 2, radius * 2, 90, 90); // Corner
            gp.AddLine(x, y + height - (radius * 2), x, y + radius); // Line
            gp.AddArc(x, y, radius * 2, radius * 2, 180, 90); // Corner
            gp.CloseFigure();

            return gp;
        }

        public static GraphicsPath Create(int x, int y, int width, int height, int radius, RectangleCorners corners)
        {
            int xw = x + width;
            int yh = y + height;
            int xwr = xw - radius;
            int yhr = yh - radius;
            int xr = x + radius;
            int yr = y + radius;
            int r2 = radius * 2;
            int xwr2 = xw - r2;
            int yhr2 = yh - r2;

            GraphicsPath p = new GraphicsPath();
            p.StartFigure();

            //Top Left Corner
            if ((RectangleCorners.TopLeft & corners) == RectangleCorners.TopLeft)
            {
                p.AddArc(x, y, r2, r2, 180, 90);
            }
            else
            {
                p.AddLine(x, yr, x, y);
                p.AddLine(x, y, xr, y);
            }

            //Top Edge
            p.AddLine(xr, y, xwr, y);

            //Top Right Corner
            if ((RectangleCorners.TopRight & corners) == RectangleCorners.TopRight)
            {
                p.AddArc(xwr2, y, r2, r2, 270, 90);
            }
            else
            {
                p.AddLine(xwr, y, xw, y);
                p.AddLine(xw, y, xw, yr);
            }

            //Right Edge
            p.AddLine(xw, yr, xw, yhr);

            //Bottom Right Corner
            if ((RectangleCorners.BottomRight & corners) == RectangleCorners.BottomRight)
            {
                p.AddArc(xwr2, yhr2, r2, r2, 0, 90);
            }
            else
            {
                p.AddLine(xw, yhr, xw, yh);
                p.AddLine(xw, yh, xwr, yh);
            }

            //Bottom Edge
            p.AddLine(xwr, yh, xr, yh);

            //Bottom Left Corner
            if ((RectangleCorners.BottomLeft & corners) == RectangleCorners.BottomLeft)
            {
                p.AddArc(x, yhr2, r2, r2, 90, 90);
            }
            else
            {
                p.AddLine(xr, yh, x, yh);
                p.AddLine(x, yh, x, yhr);
            }

            //Left Edge
            p.AddLine(x, yhr, x, yr);

            p.CloseFigure();
            return p;
        }

        public static GraphicsPath Create(Rectangle rect, int radius, RectangleCorners corners)
        {
            return Create(rect.X, rect.Y, rect.Width, rect.Height, radius, corners);
        }

        public static GraphicsPath Create(int x, int y, int width, int height, int radius)
        {
            return Create(x, y, width, height, radius, RectangleCorners.All);
        }

        public static GraphicsPath Create(Rectangle rect, int radius)
        {
            return Create(rect.X, rect.Y, rect.Width, rect.Height, radius);
        }

        public static GraphicsPath Create(int x, int y, int width, int height)
        {
            return Create(x, y, width, height, 5);
        }

        public static GraphicsPath Create(Rectangle rect)
        {
            return Create(rect.X, rect.Y, rect.Width, rect.Height);
        }
    }
}