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OpenWPFChart: assembling charts from components: Part I - Parts

, 19 Mar 2009 CPOL
Provides the component model along with base components to assemble charts.
SourceCode.zip
trunk
ChartControls
ChartControls.csproj.user
OpenWPFChart.Chart.Icon.png
OpenWPFChart.WellLogChart.Icon.png
Properties
Themes
ChartHelpers
AxisPropertiesDialog
ChartHelpers.csproj.user
ChartScaleControl
FontChooser
ItemPropertiesDialog
Properties
ChartParts
Axes
ChartParts.csproj.user
Grid
Items
Data
DataView
Elements
Visuals
NumericalRecipes
Properties
Scales
ChartParts.vsmdi
SampleDataFiles
WellLog
Samples
ControlSamples
ColumnChartControlSample
Properties
Settings.settings
CurveChartControlSample
Properties
Settings.settings
WellLogControlSample
Properties
Settings.settings
DirectCompositionSamples
BasicSample
Properties
Settings.settings
TemperatureSample
Properties
Settings.settings
WellLogSample
Properties
Settings.settings
// <copyright file="ColumnChartItemVisual.cs" company="Oleg V. Polikarpotchkin">
// Copyright © 2008-2009 Oleg V. Polikarpotchkin. All Right Reserved
// </copyright>
// <author>Oleg V. Polikarpotchkin</author>
// <email>ov-p@yandex.ru</email>
// <date>2009-03-10</date>
// <summary>OpenWPFChart library Column Chart Item visual.</summary>
// <revision>$Id: ColumnChartItemVisual.cs 18093 2009-03-16 04:15:06Z unknown $</revision>

using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Linq;
using System.Windows;
using System.Windows.Media;

namespace OpenWPFChart.Parts
{
	/// <summary>
	/// Column Chart Item visual class.
	/// </summary>
	/// <remarks>
	/// Draws the data passed in by Points property as columns.
	/// </remarks>
	public class ColumnChartItemVisual : ItemVisual
	{
		/// <summary>
		/// Renders the ColumnChartItem
		/// </summary>
		protected internal override void Render()
		{
			Children.Clear();

			using (DrawingContext dc = RenderOpen())
			{
				ColumnChartItemDataView itemDataView = ItemDataView as ColumnChartItemDataView;
				if (itemDataView == null)
					return;

				// Render the ColumnChartItem in (x - double, y - double) coordinates.
				SampledCurveData<double, double> itemData = ItemDataView.ItemData as SampledCurveData<double, double>;
				if (itemData != null)
				{
					Render(dc, itemDataView, itemData);
					return;
				}
				// Render the ColumnChartItem in (x - DateTime, y - double) coordinates.
				SampledCurveData<DateTime, double> itemDTNData = ItemDataView.ItemData as SampledCurveData<DateTime, double>;
				if (itemDTNData != null)
				{
					Render(dc, itemDataView, itemDTNData);
					return;
				}
				// Render the ColumnChartItem in (x - object, y - double) coordinates.
				SampledCurveData<object, double> itemONData = ItemDataView.ItemData as SampledCurveData<object, double>;
				if (itemONData != null)
				{
					Render(dc, itemDataView, itemONData);
					return;
				}
			}
		}

		/// <summary>
		/// Renders the ColumnChartItem in (x - double, y - double) coordinates.
		/// </summary>
		/// <param name="dc">The dc.</param>
		/// <param name="itemDataView">The item data view.</param>
		/// <param name="itemData">The item data.</param>
		private void Render(DrawingContext dc, ColumnChartItemDataView itemDataView
			, SampledCurveData<double, double> itemData)
		{
			ChartScale hScale = itemDataView.HorizontalScale, vScale = itemDataView.VerticalScale;
			if (vScale == null || !vScale.CompatibleWith(typeof(double))
				|| hScale == null || !hScale.CompatibleWith(typeof(double))
				|| itemData.Points == null)
				return;

			// Chart area size.
			Size areaSize = new Size(hScale.ToPixels(hScale.Stop), vScale.ToPixels(vScale.Stop));

			// Clipping region
			//RectangleGeometry clip;
			//if (itemDataView.Orientation == Orientation.Horizontal)
			//    clip = new RectangleGeometry(new Rect(0, 0
			//        , hScale.ToPixels(hScale.Stop), vScale.ToPixels(vScale.Stop)));
			//else
			//    clip = new RectangleGeometry(new Rect(0, 0
			//        , vScale.ToPixels(vScale.Stop), hScale.ToPixels(hScale.Stop)));
			//dc.PushClip(clip);

			// Loop by points.
			foreach (DataPoint<double, double> pt in from pt in itemData.Points orderby pt.X select pt)
			{
				double x, y;
				bool isPtInsideArea;
				if (itemDataView.Orientation == Orientation.Horizontal)
				{
					x = hScale.ToPixels(pt.X);
					y = vScale.ToPixels(pt.Y);
					isPtInsideArea = isInsideArea(new Point(x, y), areaSize);
				}
				else // Orientation == Orientation.Vertical
				{
					y = hScale.ToPixels(pt.X);
					x = vScale.ToPixels(pt.Y);
					isPtInsideArea = isInsideArea(new Point(y, x), areaSize);
				}

				// Draw the column.
				StreamGeometry geometry = new StreamGeometry();
				using (StreamGeometryContext ctx = geometry.Open())
				{
					double xStart = x - itemDataView.ColumnWidth / 2;
					double xStop = xStart + itemDataView.ColumnWidth;
					ctx.BeginFigure(new Point(xStart, areaSize.Height)
						, true /* is filled */, true /* is closed */);
					ctx.PolyLineTo(new Point[] 
						{ 
							new Point(xStart, y), 
							new Point(xStop, y),
							new Point(xStop, areaSize.Height)
						}
						, false /* is stroked */, false /* is smooth join */);
				}
				geometry.Freeze();
				dc.DrawGeometry(itemDataView.ColumnBrush, null, geometry);
			}
		}

		/// <summary>
		/// Renders the ColumnChartItem in (x - DateTime, y - double) coordinates.
		/// </summary>
		/// <param name="dc">The dc.</param>
		/// <param name="itemDataView">The item data view.</param>
		/// <param name="itemData">The item data.</param>
		private void Render(DrawingContext dc, ColumnChartItemDataView itemDataView
			, SampledCurveData<DateTime, double> itemData)
		{
			ChartScale hScale = itemDataView.HorizontalScale, vScale = itemDataView.VerticalScale;
			if (vScale == null || !vScale.CompatibleWith(typeof(double))
				|| hScale == null || !hScale.CompatibleWith(typeof(DateTime))
				|| itemData.Points == null)
				return;

			// Chart area size.
			Size areaSize = new Size(hScale.ToPixels(hScale.Stop), vScale.ToPixels(vScale.Stop));

			// Clipping region
			//RectangleGeometry clip;
			//if (itemDataView.Orientation == Orientation.Horizontal)
			//    clip = new RectangleGeometry(new Rect(0, 0
			//        , hScale.ToPixels(hScale.Stop), vScale.ToPixels(vScale.Stop)));
			//else
			//    clip = new RectangleGeometry(new Rect(0, 0
			//        , vScale.ToPixels(vScale.Stop), hScale.ToPixels(hScale.Stop)));
			//dc.PushClip(clip);

			// Loop by points.
			foreach (DataPoint<DateTime, double> pt in from pt in itemData.Points orderby pt.X select pt)
			{
				double x, y; // coordinates in pixels
				bool isPtInsideArea;
				if (itemDataView.Orientation == Orientation.Horizontal)
				{
					x = hScale.ToPixels(pt.X);
					y = vScale.ToPixels(pt.Y);
					isPtInsideArea = isInsideArea(new Point(x, y), areaSize);
				}
				else // Orientation == Orientation.Vertical
				{
					y = hScale.ToPixels(pt.X);
					x = vScale.ToPixels(pt.Y);
					isPtInsideArea = isInsideArea(new Point(y, x), areaSize);
				}

				// Draw the column.
				StreamGeometry geometry = new StreamGeometry();
				using (StreamGeometryContext ctx = geometry.Open())
				{
					double xStart = x - itemDataView.ColumnWidth / 2;
					double xStop = xStart + itemDataView.ColumnWidth;
					ctx.BeginFigure(new Point(xStart, areaSize.Height)
						, true /* is filled */, true /* is closed */);
					ctx.PolyLineTo(new Point[] 
						{ 
							new Point(xStart, y), 
							new Point(xStop, y),
							new Point(xStop, areaSize.Height)
						}
						, false /* is stroked */, false /* is smooth join */);
				}
				geometry.Freeze();
				dc.DrawGeometry(itemDataView.ColumnBrush, null, geometry);
			}
		}

		/// <summary>
		/// Renders the ColumnChartItem in (x - object, y - double) coordinates.
		/// </summary>
		/// <param name="dc">The dc.</param>
		/// <param name="itemDataView">The item data view.</param>
		/// <param name="itemData">The item data.</param>
		private void Render(DrawingContext dc, ColumnChartItemDataView itemDataView
			, SampledCurveData<object, double> itemData)
		{
			ChartSeriesScale hScale = itemDataView.HorizontalScale as ChartSeriesScale;
			ChartScale vScale = itemDataView.VerticalScale;
			if (vScale == null || !vScale.CompatibleWith(typeof(double))
				|| hScale == null || !hScale.CompatibleWith(typeof(object))
				|| itemData.Points == null)
				return;

			// Chart area size.
			Size areaSize = new Size(hScale.ToPixels(hScale.Stop), vScale.ToPixels(vScale.Stop));

			// Clipping region
			//RectangleGeometry clip;
			//if (itemDataView.Orientation == Orientation.Horizontal)
			//    clip = new RectangleGeometry(new Rect(0, 0
			//        , hScale.ToPixels(hScale.Stop), vScale.ToPixels(vScale.Stop)));
			//else
			//    clip = new RectangleGeometry(new Rect(0, 0
			//        , vScale.ToPixels(vScale.Stop), hScale.ToPixels(hScale.Stop)));
			//dc.PushClip(clip);

			// Loop by points.
			foreach (DataPoint<object, double> pt in itemData.Points)
			{
				double x, y; // coordinates in pixels
				bool isPtInsideArea;
				try
				{
					if (itemDataView.Orientation == Orientation.Horizontal)
					{
						x = hScale.ToPixels(pt.X);
						y = vScale.ToPixels(pt.Y);
						isPtInsideArea = isInsideArea(new Point(x, y), areaSize);
					}
					else // Orientation == Orientation.Vertical
					{
						y = hScale.ToPixels(pt.X);
						x = vScale.ToPixels(pt.Y);
						isPtInsideArea = isInsideArea(new Point(y, x), areaSize);
					}
				}
				catch (ArgumentException)
				{// pt.X isn't in the hScale Series.
					continue;
				}

				// Draw the column.
				StreamGeometry geometry = new StreamGeometry();
				using (StreamGeometryContext ctx = geometry.Open())
				{
					double xStart = x - itemDataView.ColumnWidth / 2;
					double xStop = xStart + itemDataView.ColumnWidth;
					ctx.BeginFigure(new Point(xStart, areaSize.Height)
						, true /* is filled */, true /* is closed */);
					ctx.PolyLineTo(new Point[] 
						{ 
							new Point(xStart, y), 
							new Point(xStop, y),
							new Point(xStop, areaSize.Height)
						}
						, false /* is stroked */, false /* is smooth join */);
				}
				geometry.Freeze();
				dc.DrawGeometry(itemDataView.ColumnBrush, null, geometry);
			}
		}
	}
}

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This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

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About the Author

Oleg V. Polikarpotchkin
Team Leader
Russian Federation Russian Federation
No Biography provided

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