mirror of
https://github.com/ShareX/ShareX.git
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2c35af0592
Merge commits from Greenshot up through bd71f47e95a46642fe6a83bdd76cc4d2a7eed7c2. Some bug fixes, but mostly structural cleanup.
419 lines
No EOL
20 KiB
C#
419 lines
No EOL
20 KiB
C#
/*
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* Greenshot - a free and open source screenshot tool
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* Copyright (C) 2007-2015 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 Greenshot.Drawing;
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using System;
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using System.Drawing;
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using System.Windows.Forms;
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namespace Greenshot.Helpers
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{
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/// <summary>
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/// Offers a few helper functions for scaling/aligning an element with another element
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/// </summary>
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public static class ScaleHelper
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{
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[Flags]
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public enum ScaleOptions
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{
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/// <summary>
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/// Default scale behavior.
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/// </summary>
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Default = 0x00,
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/// <summary>
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/// Scale a rectangle in two our four directions, mirrored at it's center coordinates
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/// </summary>
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Centered = 0x01,
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/// <summary>
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/// Scale a rectangle maintaining it's aspect ratio
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/// </summary>
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Rational = 0x02
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}
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/// <summary>
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/// calculates the Size an element must be resized to, in order to fit another element, keeping aspect ratio
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/// </summary>
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/// <param name="currentSize">the size of the element to be resized</param>
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/// <param name="targetSize">the target size of the element</param>
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/// <param name="crop">in case the aspect ratio of currentSize and targetSize differs: shall the scaled size fit into targetSize (i.e. that one of its dimensions is smaller - false) or vice versa (true)</param>
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/// <returns>a new SizeF object indicating the width and height the element should be scaled to</returns>
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public static SizeF GetScaledSize(SizeF currentSize, SizeF targetSize, bool crop)
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{
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float wFactor = targetSize.Width / currentSize.Width;
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float hFactor = targetSize.Height / currentSize.Height;
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float factor = crop ? Math.Max(wFactor, hFactor) : Math.Min(wFactor, hFactor);
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return new SizeF(currentSize.Width * factor, currentSize.Height * factor);
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}
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/// <summary>
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/// calculates the position of an element depending on the desired alignment within a RectangleF
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/// </summary>
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/// <param name="currentRect">the bounds of the element to be aligned</param>
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/// <param name="targetRect">the rectangle reference for aligment of the element</param>
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/// <param name="alignment">the System.Drawing.ContentAlignment value indicating how the element is to be aligned should the width or height differ from targetSize</param>
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/// <returns>a new RectangleF object with Location aligned aligned to targetRect</returns>
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public static RectangleF GetAlignedRectangle(RectangleF currentRect, RectangleF targetRect, ContentAlignment alignment)
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{
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RectangleF newRect = new RectangleF(targetRect.Location, currentRect.Size);
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switch (alignment)
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{
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case ContentAlignment.TopCenter:
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newRect.X = (targetRect.Width - currentRect.Width) / 2;
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break;
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case ContentAlignment.TopRight:
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newRect.X = targetRect.Width - currentRect.Width;
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break;
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case ContentAlignment.MiddleLeft:
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newRect.Y = (targetRect.Height - currentRect.Height) / 2;
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break;
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case ContentAlignment.MiddleCenter:
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newRect.Y = (targetRect.Height - currentRect.Height) / 2;
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newRect.X = (targetRect.Width - currentRect.Width) / 2;
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break;
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case ContentAlignment.MiddleRight:
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newRect.Y = (targetRect.Height - currentRect.Height) / 2;
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newRect.X = targetRect.Width - currentRect.Width;
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break;
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case ContentAlignment.BottomLeft:
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newRect.Y = targetRect.Height - currentRect.Height;
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break;
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case ContentAlignment.BottomCenter:
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newRect.Y = targetRect.Height - currentRect.Height;
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newRect.X = (targetRect.Width - currentRect.Width) / 2;
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break;
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case ContentAlignment.BottomRight:
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newRect.Y = targetRect.Height - currentRect.Height;
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newRect.X = targetRect.Width - currentRect.Width;
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break;
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}
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return newRect;
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}
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/// <summary>
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/// calculates the Rectangle an element must be resized an positioned to, in ordder to fit another element, keeping aspect ratio
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/// </summary>
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/// <param name="currentRect">the rectangle of the element to be resized/repositioned</param>
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/// <param name="targetRect">the target size/position of the element</param>
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/// <param name="crop">in case the aspect ratio of currentSize and targetSize differs: shall the scaled size fit into targetSize (i.e. that one of its dimensions is smaller - false) or vice versa (true)</param>
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/// <param name="alignment">the System.Drawing.ContentAlignment value indicating how the element is to be aligned should the width or height differ from targetSize</param>
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/// <returns>a new RectangleF object indicating the width and height the element should be scaled to and the position that should be applied to it for proper alignment</returns>
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public static RectangleF GetScaledRectangle(RectangleF currentRect, RectangleF targetRect, bool crop, ContentAlignment alignment)
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{
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SizeF newSize = GetScaledSize(currentRect.Size, targetRect.Size, crop);
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RectangleF newRect = new RectangleF(new Point(0, 0), newSize);
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return GetAlignedRectangle(newRect, targetRect, alignment);
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}
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public static void RationalScale(ref RectangleF originalRectangle, int resizeHandlePosition, PointF resizeHandleCoords)
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{
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Scale(ref originalRectangle, resizeHandlePosition, resizeHandleCoords, ScaleOptions.Rational);
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}
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public static void CenteredScale(ref RectangleF originalRectangle, int resizeHandlePosition, PointF resizeHandleCoords)
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{
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Scale(ref originalRectangle, resizeHandlePosition, resizeHandleCoords, ScaleOptions.Centered);
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}
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public static void Scale(ref RectangleF originalRectangle, int resizeHandlePosition, PointF resizeHandleCoords)
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{
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Scale(ref originalRectangle, resizeHandlePosition, resizeHandleCoords, null);
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}
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/// <summary>
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/// Calculates target size of a given rectangle scaled by dragging one of its handles (corners)
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/// </summary>
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/// <param name="originalRectangle">bounds of the current rectangle, scaled values will be written to this reference</param>
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/// <param name="resizeHandlePosition">position of the handle/gripper being used for resized, see constants in Gripper.cs, e.g. Gripper.POSITION_TOP_LEFT</param>
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/// <param name="resizeHandleCoords">coordinates of the used handle/gripper</param>
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/// <param name="options">ScaleOptions to use when scaling</param>
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public static void Scale(ref RectangleF originalRectangle, int resizeHandlePosition, PointF resizeHandleCoords, ScaleOptions? options)
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{
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if (options == null)
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{
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options = GetScaleOptions();
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}
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if ((options & ScaleOptions.Rational) == ScaleOptions.Rational)
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{
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adjustCoordsForRationalScale(originalRectangle, resizeHandlePosition, ref resizeHandleCoords);
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}
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if ((options & ScaleOptions.Centered) == ScaleOptions.Centered)
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{
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// store center coordinates of rectangle
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float rectCenterX = originalRectangle.Left + originalRectangle.Width / 2;
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float rectCenterY = originalRectangle.Top + originalRectangle.Height / 2;
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// scale rectangle using handle coordinates
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scale(ref originalRectangle, resizeHandlePosition, resizeHandleCoords);
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// mirror handle coordinates via rectangle center coordinates
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resizeHandleCoords.X -= 2 * (resizeHandleCoords.X - rectCenterX);
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resizeHandleCoords.Y -= 2 * (resizeHandleCoords.Y - rectCenterY);
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// scale again with opposing handle and mirrored coordinates
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resizeHandlePosition = (resizeHandlePosition + 4) % 8;
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scale(ref originalRectangle, resizeHandlePosition, resizeHandleCoords);
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}
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else
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{
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scale(ref originalRectangle, resizeHandlePosition, resizeHandleCoords);
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}
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}
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/// <summary>
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/// Calculates target size of a given rectangle scaled by dragging one of its handles (corners)
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/// </summary>
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/// <param name="originalRectangle">bounds of the current rectangle, scaled values will be written to this reference</param>
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/// <param name="resizeHandlePosition">position of the handle/gripper being used for resized, see constants in Gripper.cs, e.g. Gripper.POSITION_TOP_LEFT</param>
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/// <param name="resizeHandleCoords">coordinates of the used handle/gripper</param>
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private static void scale(ref RectangleF originalRectangle, int resizeHandlePosition, PointF resizeHandleCoords)
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{
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switch (resizeHandlePosition)
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{
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case Gripper.POSITION_TOP_LEFT:
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originalRectangle.Width = originalRectangle.Left + originalRectangle.Width - resizeHandleCoords.X;
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originalRectangle.Height = originalRectangle.Top + originalRectangle.Height - resizeHandleCoords.Y;
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originalRectangle.X = resizeHandleCoords.X;
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originalRectangle.Y = resizeHandleCoords.Y;
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break;
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case Gripper.POSITION_TOP_CENTER:
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originalRectangle.Height = originalRectangle.Top + originalRectangle.Height - resizeHandleCoords.Y;
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originalRectangle.Y = resizeHandleCoords.Y;
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break;
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case Gripper.POSITION_TOP_RIGHT:
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originalRectangle.Width = resizeHandleCoords.X - originalRectangle.Left;
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originalRectangle.Height = originalRectangle.Top + originalRectangle.Height - resizeHandleCoords.Y;
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originalRectangle.Y = resizeHandleCoords.Y;
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break;
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case Gripper.POSITION_MIDDLE_LEFT:
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originalRectangle.Width = originalRectangle.Left + originalRectangle.Width - resizeHandleCoords.X;
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originalRectangle.X = resizeHandleCoords.X;
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break;
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case Gripper.POSITION_MIDDLE_RIGHT:
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originalRectangle.Width = resizeHandleCoords.X - originalRectangle.Left;
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break;
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case Gripper.POSITION_BOTTOM_LEFT:
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originalRectangle.Width = originalRectangle.Left + originalRectangle.Width - resizeHandleCoords.X;
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originalRectangle.Height = resizeHandleCoords.Y - originalRectangle.Top;
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originalRectangle.X = resizeHandleCoords.X;
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break;
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case Gripper.POSITION_BOTTOM_CENTER:
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originalRectangle.Height = resizeHandleCoords.Y - originalRectangle.Top;
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break;
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case Gripper.POSITION_BOTTOM_RIGHT:
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originalRectangle.Width = resizeHandleCoords.X - originalRectangle.Left;
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originalRectangle.Height = resizeHandleCoords.Y - originalRectangle.Top;
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break;
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default:
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throw new ArgumentException("Position cannot be handled: " + resizeHandlePosition);
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}
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}
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/// <summary>
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/// Adjusts resizeHandleCoords so that aspect ratio is kept after resizing a given rectangle with provided arguments
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/// </summary>
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/// <param name="originalRectangle">bounds of the current rectangle</param>
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/// <param name="resizeHandlePosition">position of the handle/gripper being used for resized, see constants in Gripper.cs, e.g. Gripper.POSITION_TOP_LEFT</param>
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/// <param name="resizeHandleCoords">coordinates of the used handle/gripper, adjusted coordinates will be written to this reference</param>
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private static void adjustCoordsForRationalScale(RectangleF originalRectangle, int resizeHandlePosition, ref PointF resizeHandleCoords)
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{
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float originalRatio = originalRectangle.Width / originalRectangle.Height;
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float newWidth, newHeight, newRatio;
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switch (resizeHandlePosition)
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{
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case Gripper.POSITION_TOP_LEFT:
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newWidth = originalRectangle.Right - resizeHandleCoords.X;
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newHeight = originalRectangle.Bottom - resizeHandleCoords.Y;
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newRatio = newWidth / newHeight;
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if (newRatio > originalRatio)
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{ // FIXME
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resizeHandleCoords.X = originalRectangle.Right - newHeight * originalRatio;
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}
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else if (newRatio < originalRatio)
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{
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resizeHandleCoords.Y = originalRectangle.Bottom - newWidth / originalRatio;
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}
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break;
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case Gripper.POSITION_TOP_RIGHT:
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newWidth = resizeHandleCoords.X - originalRectangle.Left;
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newHeight = originalRectangle.Bottom - resizeHandleCoords.Y;
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newRatio = newWidth / newHeight;
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if (newRatio > originalRatio)
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{ // FIXME
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resizeHandleCoords.X = newHeight * originalRatio + originalRectangle.Left;
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}
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else if (newRatio < originalRatio)
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{
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resizeHandleCoords.Y = originalRectangle.Bottom - newWidth / originalRatio;
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}
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break;
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case Gripper.POSITION_BOTTOM_LEFT:
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newWidth = originalRectangle.Right - resizeHandleCoords.X;
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newHeight = resizeHandleCoords.Y - originalRectangle.Top;
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newRatio = newWidth / newHeight;
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if (newRatio > originalRatio)
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{
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resizeHandleCoords.X = originalRectangle.Right - newHeight * originalRatio;
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}
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else if (newRatio < originalRatio)
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{
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resizeHandleCoords.Y = newWidth / originalRatio + originalRectangle.Top;
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}
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break;
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case Gripper.POSITION_BOTTOM_RIGHT:
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newWidth = resizeHandleCoords.X - originalRectangle.Left;
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newHeight = resizeHandleCoords.Y - originalRectangle.Top;
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newRatio = newWidth / newHeight;
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if (newRatio > originalRatio)
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{
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resizeHandleCoords.X = newHeight * originalRatio + originalRectangle.Left;
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}
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else if (newRatio < originalRatio)
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{
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resizeHandleCoords.Y = newWidth / originalRatio + originalRectangle.Top;
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}
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break;
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}
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}
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public static void Scale(Rectangle boundsBeforeResize, int cursorX, int cursorY, ref RectangleF boundsAfterResize)
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{
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Scale(boundsBeforeResize, cursorX, cursorY, ref boundsAfterResize, null);
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}
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public static void Scale(Rectangle boundsBeforeResize, int cursorX, int cursorY, ref RectangleF boundsAfterResize, IDoubleProcessor angleRoundBehavior)
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{
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Scale(boundsBeforeResize, Gripper.POSITION_TOP_LEFT, cursorX, cursorY, ref boundsAfterResize, angleRoundBehavior);
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}
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public static void Scale(Rectangle boundsBeforeResize, int gripperPosition, int cursorX, int cursorY, ref RectangleF boundsAfterResize, IDoubleProcessor angleRoundBehavior)
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{
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ScaleOptions opts = GetScaleOptions();
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bool rationalScale = (opts & ScaleOptions.Rational) == ScaleOptions.Rational;
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bool centeredScale = (opts & ScaleOptions.Centered) == ScaleOptions.Centered;
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if (rationalScale)
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{
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double angle = GeometryHelper.Angle2D(boundsBeforeResize.X, boundsBeforeResize.Y, cursorX, cursorY);
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if (angleRoundBehavior != null)
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{
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angle = angleRoundBehavior.Process(angle);
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}
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int dist = GeometryHelper.Distance2D(boundsBeforeResize.X, boundsBeforeResize.Y, cursorX, cursorY);
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boundsAfterResize.Width = (int)Math.Round(dist * Math.Cos(angle / 180 * Math.PI));
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boundsAfterResize.Height = (int)Math.Round(dist * Math.Sin(angle / 180 * Math.PI));
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}
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if (centeredScale)
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{
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float wdiff = boundsAfterResize.Width - boundsBeforeResize.Width;
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float hdiff = boundsAfterResize.Height - boundsBeforeResize.Height;
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boundsAfterResize.Width += wdiff;
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boundsAfterResize.Height += hdiff;
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boundsAfterResize.X -= wdiff;
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boundsAfterResize.Y -= hdiff;
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}
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}
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/// <returns>the current ScaleOptions depending on modifier keys held down</returns>
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public static ScaleOptions GetScaleOptions()
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{
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bool anchorAtCenter = (Control.ModifierKeys & Keys.Control) != 0;
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bool maintainAspectRatio = (Control.ModifierKeys & Keys.Shift) != 0;
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ScaleOptions opts = ScaleOptions.Default;
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if (anchorAtCenter) opts |= ScaleOptions.Centered;
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if (maintainAspectRatio) opts |= ScaleOptions.Rational;
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return opts;
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}
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public interface IDoubleProcessor
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{
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double Process(double d);
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}
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public class ShapeAngleRoundBehavior : IDoubleProcessor
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{
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public static ShapeAngleRoundBehavior Instance = new ShapeAngleRoundBehavior();
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private ShapeAngleRoundBehavior()
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{
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}
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public double Process(double angle)
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{
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return Math.Round((angle + 45) / 90) * 90 - 45;
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}
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}
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public class LineAngleRoundBehavior : IDoubleProcessor
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{
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public static LineAngleRoundBehavior Instance = new LineAngleRoundBehavior();
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private LineAngleRoundBehavior()
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{
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}
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public double Process(double angle)
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{
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return Math.Round(angle / 15) * 15;
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}
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}
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public class FixedAngleRoundBehavior : IDoubleProcessor
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{
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private readonly double fixedAngle;
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public FixedAngleRoundBehavior(double fixedAngle)
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{
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this.fixedAngle = fixedAngle;
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}
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public double Process(double angle)
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{
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return fixedAngle;
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}
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}
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/*public static int FindGripperPostition(float anchorX, float anchorY, float gripperX, float gripperY) {
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if(gripperY > anchorY) {
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if(gripperX > anchorY) return Gripper.POSITION_BOTTOM_RIGHT;
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else return Gripper.POSITION_BOTTOM_LEFT;
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} else {
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if(gripperX > anchorY) return Gripper.POSITION_TOP_RIGHT;
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else return Gripper.POSITION_TOP_LEFT;
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}
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}*/
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}
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} |