mirror of https://github.com/mhowlett/nplot.git
101 lines
3.5 KiB
C#
101 lines
3.5 KiB
C#
/*
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* NPlot - A charting library for .NET
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*
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* LinearGradient.cs
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* Copyright (C) 2003-2006 Matt Howlett and others.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without modification,
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* are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
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* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
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* OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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* OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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using System;
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using System.Drawing;
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namespace NPlot
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{
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/// <summary>
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/// Class for creating a linear gradient.
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/// </summary>
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public class LinearGradient : IGradient
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{
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private Color voidColor_ = Color.Black;
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/// <summary>
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/// Constructor.
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/// </summary>
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/// <param name="minColor">The color corresponding to 0.0</param>
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/// <param name="maxColor">The color corresponding to 1.0</param>
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public LinearGradient(Color minColor, Color maxColor)
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{
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MinColor = minColor;
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MaxColor = maxColor;
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}
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/// <summary>
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/// The color corresponding to 0.0
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/// </summary>
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public Color MaxColor { get; set; }
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/// <summary>
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/// The color corresponding to 1.0
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/// </summary>
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public Color MinColor { get; set; }
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/// <summary>
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/// The color corresponding to NaN
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/// </summary>
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public Color VoidColor
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{
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get { return voidColor_; }
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set { voidColor_ = value; }
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}
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/// <summary>
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/// Gets a color corresponding to a number between 0.0 and 1.0 inclusive. The color will
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/// be a linear interpolation of the min and max colors.
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/// </summary>
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/// <param name="prop">the number to get corresponding color for (between 0.0 and 1.0)</param>
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/// <returns>The color corresponding to the supplied number.</returns>
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public Color GetColor(double prop)
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{
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if (Double.IsNaN(prop))
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{
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return voidColor_;
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}
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if (prop <= 0.0)
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{
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return MinColor;
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}
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if (prop >= 1.0)
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{
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return MaxColor;
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}
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byte r = (byte) ((MinColor.R) + (int) ((MaxColor.R - (double) MinColor.R)*prop));
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byte g = (byte) ((MinColor.G) + (int) ((MaxColor.G - (double) MinColor.G)*prop));
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byte b = (byte) ((MinColor.B) + (int) ((MaxColor.B - (double) MinColor.B)*prop));
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return Color.FromArgb(r, g, b);
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}
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}
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} |