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"Merged" 0.8 with HEAD, so we can continue developing

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git-svn-id: http://svn.code.sf.net/p/greenshot/code/trunk@1282 7dccd23d-a4a3-4e1f-8c07-b4c1b4018ab4
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RKrom 2011-07-17 12:05:59 +00:00
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Greenshot/Helpers/ScaleHelper.cs Normal file
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/*
* Greenshot - a free and open source screenshot tool
* Copyright (C) 2007-2011 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;
using System.Drawing;
namespace Greenshot.Helpers {
/// <summary>
/// Offers a few helper functions for scaling/aligning an element with another element
/// </summary>
public class ScaleHelper {
private ScaleHelper() {
}
/// <summary>
/// calculates the Size an element must be resized to, in order to fit another element, keeping aspect ratio
/// </summary>
/// <param name="currentSize">the size of the element to be resized</param>
/// <param name="targetSize">the target size of the element</param>
/// <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>
/// <returns>a new SizeF object indicating the width and height the element should be scaled to</returns>
public static SizeF GetScaledSize(SizeF currentSize, SizeF targetSize, bool crop) {
float wFactor = targetSize.Width/currentSize.Width;
float hFactor = targetSize.Height/currentSize.Height;
float factor = crop ? Math.Max(wFactor, hFactor) : Math.Min(wFactor, hFactor);
//System.Diagnostics.Debug.WriteLine(currentSize.Width+"..."+targetSize.Width);
//System.Diagnostics.Debug.WriteLine(wFactor+"..."+hFactor+">>>"+factor);
return new SizeF(currentSize.Width * factor, currentSize.Height * factor);
}
/// <summary>
/// calculates the position of an element depending on the desired alignment within a RectangleF
/// </summary>
/// <param name="currentRect">the bounds of the element to be aligned</param>
/// <param name="targetRect">the rectangle reference for aligment of the element</param>
/// <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>
/// <returns>a new RectangleF object with Location aligned aligned to targetRect</returns>
public static RectangleF GetAlignedRectangle(RectangleF currentRect, RectangleF targetRect, ContentAlignment alignment) {
RectangleF newRect = new RectangleF(targetRect.Location, currentRect.Size);
switch(alignment) {
case ContentAlignment.TopCenter:
newRect.X = (targetRect.Width - currentRect.Width) / 2;
break;
case ContentAlignment.TopRight:
newRect.X = (targetRect.Width - currentRect.Width);
break;
case ContentAlignment.MiddleLeft:
newRect.Y = (targetRect.Height - currentRect.Height) / 2;
break;
case ContentAlignment.MiddleCenter:
newRect.Y = (targetRect.Height - currentRect.Height) / 2;
newRect.X = (targetRect.Width - currentRect.Width) / 2;
break;
case ContentAlignment.MiddleRight:
newRect.Y = (targetRect.Height - currentRect.Height) / 2;
newRect.X = (targetRect.Width - currentRect.Width);
break;
case ContentAlignment.BottomLeft:
newRect.Y = (targetRect.Height - currentRect.Height);
break;
case ContentAlignment.BottomCenter:
newRect.Y = (targetRect.Height - currentRect.Height);
newRect.X = (targetRect.Width - currentRect.Width) / 2;
break;
case ContentAlignment.BottomRight:
newRect.Y = (targetRect.Height - currentRect.Height);
newRect.X = (targetRect.Width - currentRect.Width);
break;
}
return newRect;
}
/// <summary>
/// calculates the Rectangle an element must be resized an positioned to, in ordder to fit another element, keeping aspect ratio
/// </summary>
/// <param name="currentRect">the rectangle of the element to be resized/repositioned</param>
/// <param name="targetRect">the target size/position of the element</param>
/// <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>
/// <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>
/// <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>
public static RectangleF GetScaledRectangle(RectangleF currentRect, RectangleF targetRect, bool crop, ContentAlignment alignment) {
SizeF newSize = GetScaledSize(currentRect.Size, targetRect.Size, crop);
RectangleF newRect = new RectangleF(new Point(0,0), newSize);
return GetAlignedRectangle(newRect, targetRect, alignment);
}
}
}