131 lines
4.8 KiB
C#
131 lines
4.8 KiB
C#
#region PDFsharp Charting - A .NET charting library based on PDFsharp
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//
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// Authors:
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// Niklas Schneider
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//
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// Copyright (c) 2005-2017 empira Software GmbH, Cologne Area (Germany)
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//
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// http://www.pdfsharp.com
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// http://sourceforge.net/projects/pdfsharp
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//
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// Permission is hereby granted, free of charge, to any person obtaining a
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// copy of this software and associated documentation files (the "Software"),
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// to deal in the Software without restriction, including without limitation
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// the rights to use, copy, modify, merge, publish, distribute, sublicense,
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// and/or sell copies of the Software, and to permit persons to whom the
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// Software is furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included
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// in all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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// THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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// DEALINGS IN THE SOFTWARE.
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#endregion
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using System;
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namespace PdfSharp.Charting.Renderers
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{
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/// <summary>
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/// Represents the base class for all Y axis renderer.
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/// </summary>
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internal abstract class YAxisRenderer : AxisRenderer
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{
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/// <summary>
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/// Initializes a new instance of the YAxisRenderer class with the specified renderer parameters.
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/// </summary>
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internal YAxisRenderer(RendererParameters parms)
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: base(parms)
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{ }
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/// <summary>
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/// Calculates optimal minimum/maximum scale and minor/major tick based on yMin and yMax.
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/// </summary>
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protected void FineTuneYAxis(AxisRendererInfo rendererInfo, double yMin, double yMax)
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{
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if (yMin == double.MaxValue && yMax == double.MinValue)
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{
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// No series data given.
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yMin = 0.0f;
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yMax = 0.9f;
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}
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if (yMin == yMax)
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{
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if (yMin == 0)
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yMax = 0.9f;
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else if (yMin < 0)
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yMax = 0;
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else if (yMin > 0)
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yMax = yMin + 1;
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}
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// If the ratio between yMax to yMin is more than 1.2, the smallest number will be set too zero.
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// It's Excel's behavior.
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if (yMin != 0)
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{
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if (yMin < 0 && yMax < 0)
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{
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if (yMin / yMax >= 1.2)
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yMax = 0;
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}
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else if (yMax / yMin >= 1.2)
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yMin = 0;
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}
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double deltaYRaw = yMax - yMin;
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int digits = (int)(Math.Log(deltaYRaw, 10) + 1);
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double normed = deltaYRaw / Math.Pow(10, digits) * 10;
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double normedStepWidth = 1;
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if (normed < 2)
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normedStepWidth = 0.2f;
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else if (normed < 5)
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normedStepWidth = 0.5f;
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AxisRendererInfo yari = rendererInfo;
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double stepWidth = normedStepWidth * Math.Pow(10.0, digits - 1.0);
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if (yari._axis == null || double.IsNaN(yari._axis._majorTick))
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yari.MajorTick = stepWidth;
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else
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yari.MajorTick = yari._axis._majorTick;
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double roundFactor = stepWidth * 0.5;
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if (yari._axis == null || double.IsNaN(yari._axis.MinimumScale))
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{
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double signumMin = (yMin != 0) ? yMin / Math.Abs(yMin) : 0;
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yari.MinimumScale = (int)(Math.Abs((yMin - roundFactor) / stepWidth) - (1 * signumMin)) * stepWidth * signumMin;
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}
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else
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yari.MinimumScale = yari._axis.MinimumScale;
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if (yari._axis == null || double.IsNaN(yari._axis.MaximumScale))
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{
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double signumMax = (yMax != 0) ? yMax / Math.Abs(yMax) : 0;
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yari.MaximumScale = (int)(Math.Abs((yMax + roundFactor) / stepWidth) + (1 * signumMax)) * stepWidth * signumMax;
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}
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else
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yari.MaximumScale = yari._axis.MaximumScale;
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if (yari._axis == null || double.IsNaN(yari._axis._minorTick))
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yari.MinorTick = yari.MajorTick / 5;
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else
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yari.MinorTick = yari._axis._minorTick;
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}
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/// <summary>
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/// Returns the default tick labels format string.
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/// </summary>
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protected override string GetDefaultTickLabelsFormat()
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{
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return "0.0";
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}
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}
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}
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