PageAlignedPhysicalAxis.cs

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00001 /*
00002 NPlot - A charting library for .NET
00003 
00004 PageAlignedPhysicalAxis.cs
00005 Copyright (C) 2005
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,
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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.Collections;
00054 
00055 namespace NPlot
00056 {
00057 
00063         public class PageAlignedPhysicalAxis
00064         {
00065 
00066                 private int pMin_;
00067                 private int pMax_;
00068                 private int pLength_;      // cached.
00069 
00070                 private double worldMin_;
00071                 private double worldMax_;
00072                 private double worldLength_; // cached.
00073                 
00074 
00079                 public PageAlignedPhysicalAxis( PhysicalAxis physicalAxis )
00080                 {
00081                         worldMin_ = physicalAxis.Axis.WorldMin;
00082                         worldMax_ = physicalAxis.Axis.WorldMax;
00083                         worldLength_ = worldMax_ - worldMin_;
00084 
00085                         if ( physicalAxis.PhysicalMin.X == physicalAxis.PhysicalMax.X )
00086                         {
00087                                 pMin_ = physicalAxis.PhysicalMin.Y;
00088                                 pMax_ = physicalAxis.PhysicalMax.Y;
00089                         }
00090                         else if ( physicalAxis.PhysicalMin.Y == physicalAxis.PhysicalMax.Y )
00091                         {
00092                                 pMin_ = physicalAxis.PhysicalMin.X;
00093                                 pMax_ = physicalAxis.PhysicalMax.X;
00094                         }
00095                         else
00096                         {
00097                                 throw new NPlotException( "Physical axis is not page aligned" );
00098                         }
00099 
00100                         pLength_ = pMax_ - pMin_;
00101 
00102                 }
00103 
00104                 
00110                 public float WorldToPhysical( double world )
00111                 {
00112                         return (float)(((world-worldMin_) / worldLength_) * (float)pLength_ + (float)pMin_);
00113                 }
00114 
00115 
00122                 public float WorldToPhysicalClipped( double world )
00123                 {
00124                         if (world > worldMax_)
00125                         {
00126                                 return pMax_;
00127                         }
00128                         
00129                         if (world < worldMin_)
00130                         {
00131                                 return pMin_;
00132                         }
00133                         
00134                         // is this quicker than returning WorldToPhysical?
00135                         return (float)(((world-worldMin_) / worldLength_) * (float)pLength_ + (float)pMin_);
00136                 }
00137         
00138 
00144                 public double PhysicalToWorld( float physical )
00145                 {
00146                         return ((float)(physical-pMin_) / (float)pLength_) * worldLength_ + worldMin_;
00147                 }
00148 
00149 
00150         }
00151 }

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