100 lines
2.8 KiB
C#
100 lines
2.8 KiB
C#
using System;
|
|
using System.Collections.Generic;
|
|
using System.Linq;
|
|
using System.Text;
|
|
using System.Windows.Media;
|
|
using System.Diagnostics;
|
|
|
|
namespace Microsoft.Research.DynamicDataDisplay.Common.Palettes
|
|
{
|
|
/// <summary>
|
|
/// Represents a color step with its offset in limits [0..1].
|
|
/// </summary>
|
|
[DebuggerDisplay("Color={Color}, Offset={Offset}")]
|
|
public class LinearPaletteColorStep
|
|
{
|
|
/// <summary>
|
|
/// Initializes a new instance of the <see cref="LinearPaletteColorStep"/> class.
|
|
/// </summary>
|
|
public LinearPaletteColorStep() { }
|
|
/// <summary>
|
|
/// Initializes a new instance of the <see cref="LinearPaletteColorStep"/> class.
|
|
/// </summary>
|
|
/// <param name="color">The color.</param>
|
|
/// <param name="offset">The offset.</param>
|
|
public LinearPaletteColorStep(Color color, double offset)
|
|
{
|
|
this.Color = color;
|
|
this.Offset = offset;
|
|
}
|
|
|
|
/// <summary>
|
|
/// Gets or sets the color.
|
|
/// </summary>
|
|
/// <value>The color.</value>
|
|
public Color Color { get; set; }
|
|
/// <summary>
|
|
/// Gets or sets the offset.
|
|
/// </summary>
|
|
/// <value>The offset.</value>
|
|
public double Offset { get; set; }
|
|
}
|
|
|
|
/// <summary>
|
|
/// Represents a palette with start and stop colors and intermediate colors with their custom offsets.
|
|
/// </summary>
|
|
public class LinearPalette : IPalette
|
|
{
|
|
/// <summary>
|
|
/// Initializes a new instance of the <see cref="LinearPalette"/> class.
|
|
/// </summary>
|
|
/// <param name="startColor">The start color.</param>
|
|
/// <param name="endColor">The end color.</param>
|
|
/// <param name="steps">The steps.</param>
|
|
public LinearPalette(Color startColor, Color endColor, params LinearPaletteColorStep[] steps)
|
|
{
|
|
this.steps.Add(new LinearPaletteColorStep(startColor, 0));
|
|
if (steps != null)
|
|
this.steps.AddMany(steps);
|
|
this.steps.Add(new LinearPaletteColorStep(endColor, 1));
|
|
}
|
|
|
|
private readonly List<LinearPaletteColorStep> steps = new List<LinearPaletteColorStep>();
|
|
|
|
#region IPalette Members
|
|
|
|
/// <summary>
|
|
/// Gets the color by interpolation coefficient.
|
|
/// </summary>
|
|
/// <param name="t">Interpolation coefficient, should belong to [0..1].</param>
|
|
/// <returns>Color.</returns>
|
|
public Color GetColor(double t)
|
|
{
|
|
if (t < 0) return steps[0].Color;
|
|
if (t > 1) return steps[steps.Count - 1].Color;
|
|
|
|
int i = 0;
|
|
double x = 0;
|
|
while (x <= t)
|
|
{
|
|
x = steps[i + 1].Offset;
|
|
i++;
|
|
}
|
|
|
|
Color c0 = steps[i - 1].Color;
|
|
Color c1 = steps[i].Color;
|
|
double ratio = (t - steps[i - 1].Offset) / (steps[i].Offset - steps[i - 1].Offset);
|
|
|
|
Color result = Color.FromRgb(
|
|
(byte)((1 - ratio) * c0.R + ratio * c1.R),
|
|
(byte)((1 - ratio) * c0.G + ratio * c1.G),
|
|
(byte)((1 - ratio) * c0.B + ratio * c1.B));
|
|
return result;
|
|
}
|
|
#pragma warning disable 0067
|
|
public event EventHandler Changed;
|
|
#pragma warning restore 0067
|
|
#endregion
|
|
}
|
|
}
|