java data matrix generator open source Using the ZedGraph Library Charting Engine in Java

Paint DataMatrix in Java Using the ZedGraph Library Charting Engine

Using the ZedGraph Library Charting Engine
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ZedGraph (http://zedgraph.org) is an open source set of classes, written in C#, that enable the creation of various 2D graphs of arbitrary datasets. Because the set is class-based, it has a high degree of programmatic flexibility, and you can modify almost every aspect of a graph including features such as scale ranges, scale types, step sizes, and so on, to be overridden from their defaults. It also allows for multirange, multitype, multiaxis graphs to be overlaid in a single chart. See Figure 11-15 for an example of a single chart that includes stacked bars, transparent overlays, and filled lines. It also includes legends and annotations.
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Figure 11-15. Sample ZedGraph chart As such, ZedGraph makes an excellent choice for use in an Atlas-based project and is easy to implement in your applications. You simply make a reference to the ZedGraph.DLL in your solution and add the ZedGraph tools to your Toolbox in the standard way.
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Drawing the Price History Graph with ZedGraph
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To implement the price history graph, you can use a new web form. The download contains the web form in a file called PH.aspx. This web form contains a single ZedGraph control. When you place a ZedGraph control from your Toolbox onto a Web form, it draws the default chart you saw in Figure 11-15. You can see the PH.aspx page in the web form designer in Figure 11-16.
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Figure 11-16. Placing the ZedGraph on a web form
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The ZedGraph fires an event upon rendering, which occurs when the page is loaded or refreshed. This event is called RenderGraph. In this case, the page is going to take two parameters, one for the ticker of the stock to be rendered and the other for the number of days to render. These will be used to make a call to the DataTier web service to get the DataTable back. The DataTable will then load the graph with the appropriate data. Listing 11-2 shows the full code for the ZedGraphWeb1_RenderGraph event handler. Listing 11-2. Rendering the Graph protected void ZedGraphWeb1_RenderGraph( System.Drawing.Graphics g, ZedGraph.MasterPane mPane) { int nDays = 0; int nRows = 0; GraphPane pane = mPane[0]; PointPairList pt = new PointPairList(); double nx; double ny; string days = (string)Page.Request.Params["days"]; string ticker = (string)Page.Request.Params["ticker"]; if (ticker != null) { ticker = ticker.Trim(); DataTier theDataTier = new DataTier(); if (days == null) nDays = 0; else nDays = Convert.ToInt32(days); DataTable dtTable = theDataTier.GetFullPriceHistory(ticker,nDays); nRows = dtTable.Rows.Count;
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for (int i = 1; i < nRows; i++) { ny = Convert.ToDouble(dtTable.Rows[i].ItemArray[1]); XDate tmpDate = new XDate( Convert.ToDateTime(dtTable.Rows[i].ItemArray[0])); nx = (double)tmpDate; pt.Add(nx, ny); }
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CHAPTER 11 s BUILDING A SAMPLE APPLICATION WITH ASP.NET AND ATLAS
pane.XAxis.Type = AxisType.Date; pane.XAxis.GridDashOff = 0; LineItem priceCurve = pane.AddCurve( "Closing Price", pt, Color.SlateBlue, SymbolType.None); priceCurve.Line.Width = 2.0F; pane.AxisFill = new Fill(Color.White, Color.AntiqueWhite); pane.XAxis.MinGrace = 0; pane.XAxis.MaxGrace = 0; pane.YAxis.MinGrace = 0; pane.YAxis.MaxGrace = 0; pane.AxisChange(g); } } This event handler takes two parameters. The first is the base System.Drawing.Graphics object. To render the graph, right at the bottom of the event handler, the System.Drawing. Graphics object is passed to the AxisChange method of a ZedGraph pane to refresh and redraw the graph. The second parameter is a reference to the ZedGraph master pane, which is the collection of drawing surfaces that the ZedGraph exposes. Check out the ZedGraph documentation for information about how to use the panes to create different drawing surfaces. This graph will be a simple line chart that uses only one pane, which is the one at the zero index of this collection. You refer to the pane with this line: GraphPane pane = mPane[0]; The subsequent graphical operations will then be performed on this pane object. To draw a line curve, it is a good idea to use the PointPairList collection that the ZedGraph library gives you. This allows you to create a single collection of data items that correspond to the X and Y values of a chart. The PointPairList supports many data types, including dates, so is perfect for the example s needs. Once the input parameters (ticker and days) have been read in and sanitized, the DataTier service is called to return a DataTable containing the results of the query for that stock and the number of days of price history you want for it. You then iterate through the DataTable and pull this information out like this: for (int i = 1; i < nRows; i++) { ny = Convert.ToDouble(dtTable.Rows[i].ItemArray[1]); XDate tmpDate = new XDate( Convert.ToDateTime(dtTable.Rows[i].ItemArray[0])); nx = (double)tmpDate; pt.Add(nx, ny); } The closing price for the stock should go on the Y axis, so it comes from .ItemArray[1] and is converted to a Double value. The original source from Yahoo, and the column on the DataTable, encodes the value as a string. This is retrieved and loaded into the ny variable.
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