asp.net data matrix s BUILDING A SAMPLE APPLICATION WITH ASP.NET AND ATLAS in Java

Creation Data Matrix in Java s BUILDING A SAMPLE APPLICATION WITH ASP.NET AND ATLAS

CHAPTER 11 s BUILDING A SAMPLE APPLICATION WITH ASP.NET AND ATLAS
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pane.AddCurve("High BB", nx, bbh, Color.Red, SymbolType.None); pane.AddCurve("Low BB", nx, bbl, Color.Red, SymbolType.None); pane.AxisFill = new Fill(Color.White, Color.AntiqueWhite); Axis.Default.MinGrace = 0; Axis.Default.MaxGrace = 0; pane.AxisChange(g); The GetAverage and GetStandardDeviation helper functions that the application uses are as follows: public double GetAverage(double[] num) { double sum = 0.0; for (int i = 0; i < num.Length; i++) { sum += num[i]; } double avg = sum / System.Convert.ToDouble(num.Length); return avg; } public double GetStandardDeviation(double[] num) { double Sum = 0.0, SumOfSqrs = 0.0; for (int i = 0; i < num.Length; i++) { Sum += num[i]; SumOfSqrs += Math.Pow(num[i], 2); } double topSum = (num.Length * SumOfSqrs) - (Math.Pow(Sum, 2)); double n = (double)num.Length; return Math.Sqrt(topSum / (n * (n - 1))); } To integrate this with the Atlas-based form, allowing for asynchronous updates, the process is the same as you saw for the price history graph. A Label control (called lblAnalyticGraph) is embedded within an UpdatePanel control. When the user types a new ticker value into the text box, the DoUpdate() function is called on the server side. This function contains the following C# code: lblAnalyticGraph.Text = "<img src='PHBB.aspx ticker=" + TextBox1.Text + "&days=100' />";
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CHAPTER 11 s BUILDING A SAMPLE APPLICATION WITH ASP.NET AND ATLAS
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This changes the text for the label, which triggers the asynchronous update. The text, in the same way as earlier, is an HTML <img> tag, pointing the image source at the PHBB.aspx page to generate the graphic. This gives an asynchronous update to the Bollinger bands chart. You can see it in action in Figure 11-23.
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Figure 11-23. The Bollinger bands chart in action
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Using Atlas Client Controls for an Enhanced UI
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This application implements some Atlas client controls and associated behaviors to empower a drag-and-drop functionality. Figure 11-24 shows the price history graph being dragged over the Bollinger band analytics graph. You can drag and drop the three panes (the two graphs plus the price history text pane) around the page and arrange them vertically.
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CHAPTER 11 s BUILDING A SAMPLE APPLICATION WITH ASP.NET AND ATLAS
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Figure 11-24. Dragging one chart over the other
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You can see that while you are dragging one item over the other, the dragged item becomes partially transparent. All this functionality is provided in the Atlas libraries. You ll see how it is done as you dissect the code. First, let s look at the Atlas Script that is on this page: <script type="text/xml-script"> <page xmlns:script="http://schemas.microsoft.com/xml-script/2005"> <components> <control id="MasterList"> <behaviors> <dragDropList dataType="HTML" acceptedDataTypes="'HTML'" dragMode="Move">
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CHAPTER 11 s BUILDING A SAMPLE APPLICATION WITH ASP.NET AND ATLAS
<dropCueTemplate> <template layoutElement="dropCueTemplate" /> </dropCueTemplate> </dragDropList> </behaviors> </control> <control id="PHItem"> <behaviors> <draggableListItem handle="PHDiv" /> </behaviors> </control> <control id="PHGraph"> <behaviors> <draggableListItem handle="PHGraphDiv" /> </behaviors> </control> <control id="PHAnalytic"> <behaviors> <draggableListItem handle="PHAnalyticDiv" /> </behaviors> </control> </components> </page> </script> When using Atlas Script, you define controls, behaviors, and actions using an XML document. You can see a lot more detail about it in 5. This script defines four Atlas controls. Each control is associated with an underlying HTML element. The first MasterList is an HTML list element. Each of the three panes is defined within a list element (<li> tag). This allows the panes to be dragged and dropped and locked into portions of the page. It s a three-item HTML list, and when you drag and drop the items, you simply rearrange how the elements are represented on the list. You associate the <dragdropList> behavior with this element to turn it into a list where the items can be rearranged using drag and drop. The Atlas Script that provides this is as follows: <dragDropList dataType="HTML" acceptedDataTypes="'HTML'" dragMode="Move"> <dropCueTemplate> <template layoutElement="dropCueTemplate" /> </dropCueTemplate> </dragDropList>
CHAPTER 11 s BUILDING A SAMPLE APPLICATION WITH ASP.NET AND ATLAS
This defines the behavior and specifies it as having an HTML type, accepting HTML data being dropped on it. It also specifies a dropCuetemplate, which points at a page element that will render status and debug information while you are dragging an element around the page. You can see the dropCueTemplate in action in Figure 11-25.
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