nplot-gtk/lib/FilledRegion.cs

/*
NPlot - A charting library for .NET

FilledRegion.cs
Copyright (C) 2004
Matt Howlett

Redistribution and use of NPlot or parts there-of in source and
binary forms, with or without modification, are permitted provided
that the following conditions are met:

1. Re-distributions in source form must retain at the head of each
   source file the above copyright notice, this list of conditions
   and the following disclaimer.

2. Any product ("the product") that makes use NPlot or parts 
   there-of must either:
  
    (a) allow any user of the product to obtain a complete machine-
        readable copy of the corresponding source code for the 
        product and the version of NPlot used for a charge no more
        than your cost of physically performing source distribution,
	on a medium customarily used for software interchange, or:

    (b) reproduce the following text in the documentation, about 
        box or other materials intended to be read by human users
        of the product that is provided to every human user of the
        product: 
   
              "This product includes software developed as 
              part of the NPlot library project available 
              from: http://www.nplot.com/" 

        The words "This product" may optionally be replace with 
        the actual name of the product.

------------------------------------------------------------------------

THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

*/

using System;
using System.Drawing;

namespace NPlot
{

	/// <summary>
	/// A quick and dirty Filled region plottable object
	/// </summary>
	public class FilledRegion : IDrawable
	{

		/// <summary>
		/// Constructor
		/// </summary>
		/// <param name="lp1">LinePlot that provides bounds to filled region [upper or lower]</param>
		/// <param name="lp2">LinePlot that provides bounds to filled region [upper or lower]</param>
		/// <remarks>TODO: make this work with other plot types.</remarks>
		public FilledRegion( LinePlot lp1, LinePlot lp2 )
		{
			lp1_ = lp1;
			lp2_ = lp2;
		}


        /// <summary>
        /// Constructor
        /// </summary>
        /// <param name="l1">Vertical line to provide bounds for filled region</param>
        /// <param name="l2">The other Vertical line to provide bounds for filled region</param>
        public FilledRegion(VerticalLine l1, VerticalLine l2)
        {
            vl1_ = l1;
            vl2_ = l2;
        }


        /// <summary>
        /// Constructor
        /// </summary>
        /// <param name="l1">Vertical line to provide bounds for filled region</param>
        /// <param name="l2">The other Vertical line to provide bounds for filled region</param>
        public FilledRegion(HorizontalLine l1, HorizontalLine l2)
        {
            hl1_ = l1;
            hl2_ = l2;
        }


        /// <summary>
		/// Draw the filled region
		/// </summary>
		/// <param name="g">The GDI+ surface on which to draw.</param>
		/// <param name="xAxis">The X-Axis to draw against.</param>
		/// <param name="yAxis">The Y-Axis to draw against.</param>
		public void Draw( System.Drawing.Graphics g, PhysicalAxis xAxis, PhysicalAxis yAxis )
		{
            ITransform2D t = Transform2D.GetTransformer(xAxis, yAxis);

            Brush b = brush_;
            if (b == null)
            {
                b = areaBrush_.Get(new Rectangle(xAxis.PhysicalMin.X, yAxis.PhysicalMax.Y, xAxis.PhysicalLength, yAxis.PhysicalLength));
            }

            if (hl1_ != null && hl2_ != null)
            {
                PointF[] points = new PointF[4];
                points[0] = t.Transform(xAxis.Axis.WorldMin, hl1_.OrdinateValue);
                points[1] = t.Transform(xAxis.Axis.WorldMax, hl1_.OrdinateValue);
                points[2] = t.Transform(xAxis.Axis.WorldMax, hl2_.OrdinateValue);
                points[3] = t.Transform(xAxis.Axis.WorldMin, hl2_.OrdinateValue);

                g.FillPolygon(b, points);
            }   
            else if (vl1_ != null && vl2_ != null)
            {
                PointF[] points = new PointF[4];
                points[0] = t.Transform(vl1_.AbscissaValue, yAxis.Axis.WorldMin);
                points[1] = t.Transform(vl1_.AbscissaValue, yAxis.Axis.WorldMax);
                points[2] = t.Transform(vl2_.AbscissaValue, yAxis.Axis.WorldMax);
                points[3] = t.Transform(vl2_.AbscissaValue, yAxis.Axis.WorldMin);

                g.FillPolygon(b, points);
            }
            else if (lp1_ != null && lp2_ != null)
            {

                SequenceAdapter a1 = new SequenceAdapter(lp1_.DataSource, lp1_.DataMember, lp1_.OrdinateData, lp1_.AbscissaData);
                SequenceAdapter a2 = new SequenceAdapter(lp2_.DataSource, lp2_.DataMember, lp2_.OrdinateData, lp2_.AbscissaData);


                int count = a1.Count + a2.Count;
                PointF[] points = new PointF[count];
                for (int i = 0; i < a1.Count; ++i)
                {
                    points[i] = t.Transform(a1[i]);
                }
                for (int i = 0; i < a2.Count; ++i)
                {
                    points[i + a1.Count] = t.Transform(a2[a2.Count - i - 1]);
                }

                g.FillPolygon(b, points);
            }
            else
            {
                throw new NPlotException("One of bounds was set to null");
            }
        }


		/// <summary>
		/// Use this brush (and not a RectangleBrush) for drawing.
		/// </summary>
		public Brush Brush
		{
			set
			{
				brush_ = value;
				areaBrush_ = null;
			}
		}


		/// <summary>
		/// Use this RectangleBrush (and not a normal Brush) for drawing.
		/// </summary>
		public IRectangleBrush RectangleBrush
		{
			set
			{
				brush_ = null;
				areaBrush_ = value;
			}
		}


        private VerticalLine vl1_;
        private VerticalLine vl2_;

        private HorizontalLine hl1_;
        private HorizontalLine hl2_;

        private LinePlot lp1_;
		private LinePlot lp2_;

		private Brush brush_ = new SolidBrush( Color.GhostWhite );
		private IRectangleBrush areaBrush_ = null;
	}

}