LinearGradient.cs

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00001 /*
00002 NPlot - A charting library for .NET
00003 
00004 Gradient.cs
00005 Copyright (C) 2003
00006 Matt Howlett
00007 
00008 Redistribution and use of NPlot or parts there-of in source and
00009 binary forms, with or without modification, are permitted provided
00010 that the following conditions are met:
00011 
00012 1. Re-distributions in source form must retain at the head of each
00013    source file the above copyright notice, this list of conditions
00014    and the following disclaimer.
00015 
00016 2. Any product ("the product") that makes use NPlot or parts 
00017    there-of must either:
00018   
00019     (a) allow any user of the product to obtain a complete machine-
00020         readable copy of the corresponding source code for the 
00021         product and the version of NPlot used for a charge no more
00022         than your cost of physically performing source distribution,
00023         on a medium customarily used for software interchange, or:
00024 
00025     (b) reproduce the following text in the documentation, about 
00026         box or other materials intended to be read by human users
00027         of the product that is provided to every human user of the
00028         product: 
00029    
00030               "This product includes software developed as 
00031               part of the NPlot library project available 
00032               from: http://www.nplot.com/" 
00033 
00034         The words "This product" may optionally be replace with 
00035         the actual name of the product.
00036 
00037 ------------------------------------------------------------------------
00038 
00039 THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
00040 IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
00041 OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
00042 IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
00043 INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
00044 NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
00045 DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
00046 THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
00047 (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
00048 THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
00049 
00050 */
00051 
00052 using System;
00053 using System.Drawing;
00054 
00055 namespace NPlot
00056 {
00057 
00061         public class LinearGradient : IGradient
00062         {
00063                 
00069                 public LinearGradient( Color minColor, Color maxColor )
00070                 {
00071                         this.minColor_ = minColor;
00072                         this.maxColor_ = maxColor;
00073                 }
00074 
00075 
00079                 public Color MaxColor
00080                 {
00081                         get
00082                         {
00083                                 return this.maxColor_;
00084                         }
00085                         set
00086                         {
00087                                 this.maxColor_ = value;
00088                         }
00089                 }
00090                 private Color maxColor_;
00091 
00092 
00096                 public Color MinColor
00097                 {
00098                         get
00099                         {
00100                                 return this.minColor_;
00101                         }
00102                         set
00103                         {
00104                                 this.minColor_ = value;
00105                         }
00106                 }
00107                 private Color minColor_;
00108 
00109 
00116                 public Color GetColor( double prop )
00117                 {
00118 
00119 #if CHECK_ERRORS
00120                         if ( prop < 0.0 || prop > 1.0 )
00121                         {
00122                                 throw new NPlotException( "WARNING: Gradient.GetColor: proportion not in range 0.0 <= prop <= 1.0" );
00123                         }
00124 #endif
00125 
00126                         if ( prop <= 0.0 )
00127                         {
00128                                 return this.MinColor;
00129                         }
00130 
00131                         if ( prop >= 1.0 )
00132                         {
00133                                 return this.MaxColor;
00134                         }
00135 
00136                         byte r = (byte)((int)(this.MinColor.R) + (int)(((double)this.MaxColor.R - (double)this.MinColor.R)*prop));
00137                         byte g = (byte)((int)(this.MinColor.G) + (int)(((double)this.MaxColor.G - (double)this.MinColor.G)*prop));
00138                         byte b = (byte)((int)(this.MinColor.B) + (int)(((double)this.MaxColor.B - (double)this.MinColor.B)*prop));
00139 
00140                         return Color.FromArgb(r,g,b);
00141                 }
00142 
00143 
00144         }
00145 }

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