mirror of https://github.com/mhowlett/nplot.git
211 lines
7.3 KiB
C#
211 lines
7.3 KiB
C#
/*
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* NPlot - A charting library for .NET
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*
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* HorizontalLine.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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using System.Text;
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namespace NPlot
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{
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/// <summary>
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/// Encapsulates functionality for drawing a horizontal line on a plot surface.
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/// </summary>
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public class HorizontalLine : IPlot
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{
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private string label_ = "";
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private Pen pen_ = new Pen(Color.Black);
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private int pixelIndent_;
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private float scale_ = 1.0f;
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private double value_;
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/// <summary>
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/// Constructor
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/// </summary>
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/// <param name="ordinateValue">ordinate (Y) value of line.</param>
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public HorizontalLine(double ordinateValue)
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{
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value_ = ordinateValue;
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}
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/// <summary>
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/// Constructor
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/// </summary>
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/// <param name="ordinateValue">ordinate (Y) value of line.</param>
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/// <param name="color">draw the line using this color.</param>
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public HorizontalLine(double ordinateValue, Color color)
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{
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value_ = ordinateValue;
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pen_ = new Pen(color);
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}
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/// <summary>
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/// Constructor
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/// </summary>
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/// <param name="ordinateValue">ordinate (Y) value of line.</param>
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/// <param name="pen">Pen to use to draw the line.</param>
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public HorizontalLine(double ordinateValue, Pen pen)
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{
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value_ = ordinateValue;
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pen_ = pen;
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}
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/// <summary>
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/// ordinate (Y) value to draw horizontal line at.
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/// </summary>
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public double OrdinateValue
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{
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get { return value_; }
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set { value_ = value; }
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}
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/// <summary>
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/// Pen to use to draw the horizontal line.
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/// </summary>
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public Pen Pen
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{
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get { return pen_; }
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set { pen_ = value; }
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}
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/// <summary>
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/// Each end of the line is indented by this many pixels.
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/// </summary>
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public int PixelIndent
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{
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get { return pixelIndent_; }
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set { pixelIndent_ = value; }
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}
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/// <summary>
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/// The line length is multiplied by this amount. Default
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/// corresponds to a value of 1.0.
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/// </summary>
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public float LengthScale
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{
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get { return scale_; }
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set { scale_ = value; }
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}
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/// <summary>
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/// Draws a representation of the horizontal line in the legend.
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/// </summary>
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/// <param name="g">The graphics surface on which to draw</param>
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/// <param name="startEnd">A rectangle specifying the bounds of the area in the legend set aside for drawing.</param>
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public void DrawInLegend(Graphics g, Rectangle startEnd)
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{
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g.DrawLine(pen_, startEnd.Left, (startEnd.Top + startEnd.Bottom)/2,
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startEnd.Right, (startEnd.Top + startEnd.Bottom)/2);
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}
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/// <summary>
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/// A label to associate with the plot - used in the legend.
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/// </summary>
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public string Label
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{
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get { return label_; }
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set { label_ = value; }
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}
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/// <summary>
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/// Whether or not to include an entry for this plot in the legend if it exists.
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/// </summary>
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public bool ShowInLegend { get; set; }
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/// <summary>
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/// Returns null indicating that x extremities of the line are variable.
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/// </summary>
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/// <returns>null</returns>
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public Axis SuggestXAxis()
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{
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return null;
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}
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/// <summary>
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/// Returns a y-axis that is suitable for drawing this plot.
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/// </summary>
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/// <returns>A suitable y-axis.</returns>
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public Axis SuggestYAxis()
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{
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return new LinearAxis(value_, value_);
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}
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/// <summary>
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/// Writes text data describing the horizontal line object to the supplied string builder. It is
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/// possible to specify that the data will be written only if the line is in the specified
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/// region.
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/// </summary>
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/// <param name="sb">the StringBuilder object to write to.</param>
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/// <param name="region">a region used if onlyInRegion is true.</param>
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/// <param name="onlyInRegion">If true, data will be written only if the line is in the specified region.</param>
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public void WriteData(StringBuilder sb, RectangleD region, bool onlyInRegion)
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{
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// return if line is not in plot region and
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if (value_ > region.Y + region.Height || value_ < region.Y)
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{
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if (onlyInRegion)
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{
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return;
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}
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}
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sb.Append("Label: ");
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sb.Append(Label);
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sb.Append("\r\n");
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sb.Append(value_.ToString());
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sb.Append("\r\n");
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}
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/// <summary>
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/// Draws the horizontal line plot on a GDI+ surface against the provided x and y axes.
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/// </summary>
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/// <param name="g">The GDI+ surface on which to draw.</param>
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/// <param name="xAxis">The X-Axis to draw against.</param>
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/// <param name="yAxis">The Y-Axis to draw against.</param>
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public void Draw(Graphics g, PhysicalAxis xAxis, PhysicalAxis yAxis)
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{
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int xMin = xAxis.PhysicalMin.X;
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int xMax = xAxis.PhysicalMax.X;
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xMin += pixelIndent_;
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xMax -= pixelIndent_;
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float length = Math.Abs(xMax - xMin);
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float lengthDiff = length - length*scale_;
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float indentAmount = lengthDiff/2;
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xMin += (int) indentAmount;
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xMax -= (int) indentAmount;
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int yPos = (int) yAxis.WorldToPhysical(value_, false).Y;
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g.DrawLine(pen_, new Point(xMin, yPos), new Point(xMax, yPos));
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// todo: clip and proper logic for flipped axis min max.
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}
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}
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} |