mirror of
https://github.com/greenshot/greenshot
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019b482195
git-svn-id: http://svn.code.sf.net/p/greenshot/code/trunk@731 7dccd23d-a4a3-4e1f-8c07-b4c1b4018ab4
46 lines
1.7 KiB
C#
46 lines
1.7 KiB
C#
/*
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* Greenshot - a free and open source screenshot tool
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* Copyright (C) 2007-2010 Thomas Braun, Jens Klingen, Robin Krom
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*
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* For more information see: http://getgreenshot.org/
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* The Greenshot project is hosted on Sourceforge: http://sourceforge.net/projects/greenshot/
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 1 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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using System;
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namespace Greenshot.Helpers {
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/// <summary>
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/// Description of DrawingHelper.
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/// </summary>
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public class DrawingHelper {
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private DrawingHelper() {
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}
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/// <summary>
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/// Perpendicular distance to line is calculated using Analytical Geometry
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/// </summary>
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/// <returns>Distance to line or -1 if not between the points"</returns>
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public static double CalculateLinePointDistance(double x1, double y1, double x2, double y2, double px, double py) {
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double deltaX = x2 - x1;
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double deltaY = y2 - y1;
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double delta = Math.Sqrt(Math.Pow(deltaX, 2) + Math.Pow(deltaY, 2));
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double ratio = (double) ((px - x1) * deltaX + (py - y1) * deltaY) / (deltaX * deltaX + deltaY * deltaY);
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if (ratio * (1 - ratio) < 0) {
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return -1;
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}
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return (double) Math.Abs(deltaX * (py - y1) - deltaY * (px - x1)) / delta;
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}
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}
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}
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