1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
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;
}
}
}
|
