create barcodes in vb.net Drawing with direct rendering in C#.NET

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14.3 Drawing with direct rendering
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Another approach that we can take to drawing is to directly render our graph when it s needed. This approach is the most similar to classic Windows drawing, where you d catch the WM_PAINT message and redraw your application. For this reason, if you ve done SDK controls or Windows Forms custom controls, this, in many ways, will feel the most comfortably familiar.
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Drawing with direct rendering
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Figure 14.10 When you start adding lots of Shapes, performance and memory usage will begin to suffer. For example, resizing may get a little sluggish.
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But, there s a major difference between the WPF approach and the old stuff. In classic Windows drawing, when a section of the screen needed to be redrawn, a message was sent to your Window, and you were expected to redraw the screen right away. If a user moved another Window on top of your Window and then moved it off again, you d have to re-redraw that bit of the screen. This is referred to as immediate mode drawing because you have to immediately redraw everything as needed. In contrast, WPF uses retained-mode drawing. When WPF tells you to draw something, it only tells you once. You then describe your UI to WPF (albeit in a way that seems similar to the immediate-mode approach). The difference, though, is that WPF remembers (or retains) the description of your UI and doesn t ask you to redraw anything when, for example, part of the Window is covered and then uncovered. The only time you have to redescribe your UI is if something changes (for example, if the Window is resized or if you want to change what it looks like). Aside from being more convenient for the developer, this approach helps make it possible for WPF to take advantage of graphics card capabilities, handle complex transparency situations, and so on because it controls the rendering.
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14.3.1 Recreating the graph control To demonstrate direct rendering, let s create an entirely new version of our ColumnGraphCtrl called ColumnGraphRenderCtrl that, instead of creating Shape objects, renders the graph as it s needed. Then we can swap out the controls and see what happens. As with the Shape-based graph, we ll be doing almost everything programmatically rather than with the Visual Studio designer. When we were using Shapes, if we d known the Shapes we wanted ahead of time, we could have dragged them onto our control in
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the designer. But, with direct rendering, we have no such option; this is fairly normal if we were using WinForms or MFC, we wouldn t get any designer help either. The XAML for ColumnGraphRenderCtrl is even simpler than for ColumnGraphCtrl. We not only don t have to bother with a Canvas but we can get rid of the Grid as well.
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<UserControl x:Class="GraphingWithShapes.ColumnGraphRenderCtrl" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" Height="300" Width="300" > </UserControl>
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That s the whole thing. And we can swap out the old ColumnGraphCtrl with the ColumnGraphRenderCtrl in the GraphHolder control by changing the one line of XAML:
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<local:ColumnGraphRenderCtrl x:Name="graphCtrl" Grid.Column="1" Height="Auto" Width="Auto"/>
We ve given the control the same name, and we ll have a method in ColumnGraphRenderCtrl called SetData(), as we did in the old control, so we won t even have to change that. Listing 14.7 has most of the code for the ColumnGraphRenderCtrl.
Listing 14.7 ColumnGraphRenderCtrl.xaml.cs
using System; ...bulk of using statements omitted... using System.Collections.ObjectModel; using System.Collections.Specialized; namespace GraphingWithShapes { public partial class ColumnGraphRenderCtrl : UserControl { private ObservableCollection<NameValuePair> dataPoints = null; private List<Color> columnColors = new List<Color>() { Colors.Blue, Colors.Red, Colors.Green }; public ColumnGraphRenderCtrl() { InitializeComponent(); }
Gets reference to list of values
public void SetData(ObservableCollection<NameValuePair> data) { dataPoints = data; dataPoints.CollectionChanged += new NotifyCollectionChangedEventHandler(dataPoints_CollectionChanged); InvalidateVisual(); } void dataPoints_CollectionChanged(object sender, NotifyCollectionChangedEventArgs e) { InvalidateVisual(); } Works the same
public double GetLargestValue()
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