93 lines
2.8 KiB
C#
93 lines
2.8 KiB
C#
// Copyright (c) AlphaSierraPapa for the SharpDevelop Team (for details please see \doc\copyright.txt)
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// This code is distributed under the GNU LGPL (for details please see \doc\license.txt)
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using System;
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using System.Windows;
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using System.Windows.Media;
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namespace ICSharpCode.AvalonEdit.Utils
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{
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/// <summary>
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/// Contains static helper methods for aligning stuff on a whole number of pixels.
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/// </summary>
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public static class PixelSnapHelpers
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{
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/// <summary>
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/// Gets the pixel size on the screen containing visual.
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/// This method does not take transforms on visual into account.
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/// </summary>
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public static Size GetPixelSize(Visual visual)
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{
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if (visual == null)
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throw new ArgumentNullException("visual");
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PresentationSource source = PresentationSource.FromVisual(visual);
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if (source != null) {
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Matrix matrix = source.CompositionTarget.TransformFromDevice;
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return new Size(matrix.M11, matrix.M22);
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} else {
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return new Size(1, 1);
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}
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}
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/// <summary>
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/// Aligns <paramref name="value"/> on the next middle of a pixel.
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/// </summary>
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/// <param name="value">The value that should be aligned</param>
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/// <param name="pixelSize">The size of one pixel</param>
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public static double PixelAlign(double value, double pixelSize)
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{
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// 0 -> 0.5
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// 0.1 -> 0.5
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// 0.5 -> 0.5
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// 0.9 -> 0.5
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// 1 -> 1.5
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return pixelSize * (Math.Round((value / pixelSize) + 0.5) - 0.5);
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}
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/// <summary>
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/// Aligns the borders of rect on the middles of pixels.
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/// </summary>
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public static Rect PixelAlign(Rect rect, Size pixelSize)
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{
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rect.X = PixelAlign(rect.X, pixelSize.Width);
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rect.Y = PixelAlign(rect.Y, pixelSize.Height);
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rect.Width = Round(rect.Width, pixelSize.Width);
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rect.Height = Round(rect.Height, pixelSize.Height);
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return rect;
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}
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/// <summary>
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/// Rounds <paramref name="point"/> to whole number of pixels.
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/// </summary>
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public static Point Round(Point point, Size pixelSize)
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{
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return new Point(Round(point.X, pixelSize.Width), Round(point.Y, pixelSize.Height));
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}
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/// <summary>
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/// Rounds val to whole number of pixels.
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/// </summary>
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public static Rect Round(Rect rect, Size pixelSize)
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{
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return new Rect(Round(rect.X, pixelSize.Width), Round(rect.Y, pixelSize.Height),
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Round(rect.Width, pixelSize.Width), Round(rect.Height, pixelSize.Height));
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}
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/// <summary>
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/// Rounds <paramref name="value"/> to a whole number of pixels.
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/// </summary>
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public static double Round(double value, double pixelSize)
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{
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return pixelSize * Math.Round(value / pixelSize);
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}
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/// <summary>
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/// Rounds <paramref name="value"/> to an whole odd number of pixels.
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/// </summary>
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public static double RoundToOdd(double value, double pixelSize)
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{
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return Round(value - pixelSize, pixelSize * 2) + pixelSize;
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}
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}
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}
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