1 files changed, 92 insertions, 0 deletions
diff --git a/Software/Visual_Studio/Scripting/Tango.Scripting.Editors/Utils/PixelSnapHelpers.cs b/Software/Visual_Studio/Scripting/Tango.Scripting.Editors/Utils/PixelSnapHelpers.cs
new file mode 100644
index 000000000..abd859533
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+++ b/Software/Visual_Studio/Scripting/Tango.Scripting.Editors/Utils/PixelSnapHelpers.cs
@@ -0,0 +1,92 @@
+// Copyright (c) AlphaSierraPapa for the SharpDevelop Team (for details please see \doc\copyright.txt)
+// This code is distributed under the GNU LGPL (for details please see \doc\license.txt)
+
+using System;
+using System.Windows;
+using System.Windows.Media;
+
+namespace Tango.Scripting.Editors.Utils
+{
+	/// <summary>
+	/// Contains static helper methods for aligning stuff on a whole number of pixels.
+	/// </summary>
+	public static class PixelSnapHelpers
+	{
+		/// <summary>
+		/// Gets the pixel size on the screen containing visual.
+		/// This method does not take transforms on visual into account.
+		/// </summary>
+		public static Size GetPixelSize(Visual visual)
+		{
+			if (visual == null)
+				throw new ArgumentNullException("visual");
+			PresentationSource source = PresentationSource.FromVisual(visual);
+			if (source != null) {
+				Matrix matrix = source.CompositionTarget.TransformFromDevice;
+				return new Size(matrix.M11, matrix.M22);
+			} else {
+				return new Size(1, 1);
+			}
+		}
+		
+		/// <summary>
+		/// Aligns <paramref name="value"/> on the next middle of a pixel.
+		/// </summary>
+		/// <param name="value">The value that should be aligned</param>
+		/// <param name="pixelSize">The size of one pixel</param>
+		public static double PixelAlign(double value, double pixelSize)
+		{
+			// 0 -> 0.5
+			// 0.1 -> 0.5
+			// 0.5 -> 0.5
+			// 0.9 -> 0.5
+			// 1 -> 1.5
+			return pixelSize * (Math.Round((value / pixelSize) + 0.5) - 0.5);
+		}
+		
+		/// <summary>
+		/// Aligns the borders of rect on the middles of pixels.
+		/// </summary>
+		public static Rect PixelAlign(Rect rect, Size pixelSize)
+		{
+			rect.X = PixelAlign(rect.X, pixelSize.Width);
+			rect.Y = PixelAlign(rect.Y, pixelSize.Height);
+			rect.Width = Round(rect.Width, pixelSize.Width);
+			rect.Height = Round(rect.Height, pixelSize.Height);
+			return rect;
+		}
+		
+		/// <summary>
+		/// Rounds <paramref name="point"/> to whole number of pixels.
+		/// </summary>
+		public static Point Round(Point point, Size pixelSize)
+		{
+			return new Point(Round(point.X, pixelSize.Width), Round(point.Y, pixelSize.Height));
+		}
+		
+		/// <summary>
+		/// Rounds val to whole number of pixels.
+		/// </summary>
+		public static Rect Round(Rect rect, Size pixelSize)
+		{
+			return new Rect(Round(rect.X, pixelSize.Width), Round(rect.Y, pixelSize.Height),
+			                Round(rect.Width, pixelSize.Width), Round(rect.Height, pixelSize.Height));
+		}
+		
+		/// <summary>
+		/// Rounds <paramref name="value"/> to a whole number of pixels.
+		/// </summary>
+		public static double Round(double value, double pixelSize)
+		{
+			return pixelSize * Math.Round(value / pixelSize);
+		}
+		
+		/// <summary>
+		/// Rounds <paramref name="value"/> to an whole odd number of pixels.
+		/// </summary>
+		public static double RoundToOdd(double value, double pixelSize)
+		{
+			return Round(value - pixelSize, pixelSize * 2) + pixelSize;
+		}
+	}
+}