create barcodes in vb.net There really is a Pen object used for drawing the border. We ll talk about it in more detail later. in Visual C#.NET

Paint PDF417 in Visual C#.NET There really is a Pen object used for drawing the border. We ll talk about it in more detail later.

There really is a Pen object used for drawing the border. We ll talk about it in more detail later.
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If you want to make a Polyline act like a Polygon, you can add a final point that s the same as the starting point. You might not think that you can fill in a Polyline unless you do that, but you can. The fill acts as though that last line exists. You can also control (to some extent) the algorithm used to fill in the shape; this fact matters when you have lines that cross one another. You can control the behavior by setting the FillRule. But, this isn t something you usually have to worry about.
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Just as there s no built-in triangle shape in WPF, there s also no built-in squished lemon. If you want one, you have to create it yourself using a Path. A Path is the most powerful of the drawing shapes, as well as the hardest to use. A Path is sort of like a Polyline, except that the individual segments can be things other than lines, such as arcs and curves. For example, here s the XAML for our shape:
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<Path Stroke="Black" StrokeThickness="3" Fill="Yellow" Canvas.Left="21" Canvas.Top="188" > <Path.Data> <PathGeometry> <PathGeometry.Figures> <PathFigure StartPoint="0,0"> <PathFigure.Segments> <LineSegment Point="20 30"/> <ArcSegment Size="30,30" IsLargeArc="False" SweepDirection="CounterClockwise" Point="50,40" /> <ArcSegment Size="10,10" IsLargeArc="False" SweepDirection="CounterClockwise" Point="10,0" /> </PathFigure.Segments> </PathFigure> </PathGeometry.Figures> </PathGeometry> </Path.Data> </Path>
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The shape is made up of a series of segments a straight line and two arcs. Notice that we re filling the shape, even though the shape isn t closed (although there s a property on PathFigure called IsClosed that, if set to true, will automatically close the shape for us). We re only scratching the surface of Paths. As well as lines and arcs, you can draw B zier curves, and even full shapes such as ellipses and rectangles. But, we aren t going to go into a great deal of detail here because we ll be discussing the underlying capabilities in a later section.
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14.1.2 Stupid shape tricks One of the cool things about Shapes is that they re UIElements and behave like other things you can drag onto a layout. For example, if we change the layout from a Canvas to a StackPanel, our shapes will line up appropriately (figure 14.5).
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Figure 14.5 The same shapes in a StackPanel with the Orientation set to Horizontal
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Figure 14.6 By removing the Height property from the Rectangle and the Ellipse, we let the layout control the height of the Shapes.
Also, at least for the Shapes that don t have explicit points set, you can have the layout control size for you in certain ways. For example, if we remove the Height property values from the Rectangle and the Ellipse, the layout will automatically make the shapes take up all available space (figure 14.6). Shapes also can handle events such as mouse events. For example, we could add a handler to the MouseDown event on the Polygon.
<Polygon Fill="Red" Canvas.Left = "100" Canvas.Top="30" MouseDown="Polygon_MouseDown" >
Note that we can t catch a Click event. Certain controls, such as Button, define a Click event, but we can get at all the slightly lower-level mouse operations like mouse down, mouse move, and so on. We implement the handler as we would any other.
private void Polygon_MouseDown(object sender, MouseButtonEventArgs e) { MessageBox.Show( "You clicked on the triangle. Please don't do that again."); }
Figure 14.7 shows what happens when we click the Polygon. The point is that Shapes are pretty capable objects. They have all the things that the various controls we ve used have, such as binding and layout support, events, and so on, which makes them pretty easy to work with. They also work nicely with control templates, as we demonstrated with the calculator. But, there s a downside to using
Figure 14.7 We add a handler to the Polygon for when the user clicks it. We can do this because Shapes are full-blown UIElements.
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