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ELLIPSE
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Figure 14.4 Rectangle with a gradient and rounded corners
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An ellipse is a, well, it s a curvy-roundy shaped thing. The proper definition has all sorts of hard words about multiple foci and such, but all you really need to know is that it s basically a circle or a stretched circle. You define an Ellipse in WPF by providing the rectangle that it needs to fit in. Here s the XAML:
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<Ellipse Fill="Green" Stroke="Black" StrokeThickness="2" Canvas.Left = "60" Canvas.Top="120" Width="40" Height="40"/>
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One thing you might notice is that the ellipse has a border around the edge. We ve done that by specifying the Stroke and the StrokeThickness. Stroke is the color of the pen to use to draw the edge and StrokeThickness is how big to make it. As you ll see a bit later, there are all sorts of other properties you can specify here, such as making the Stroke dashed. And the Stroke is a brush, so it can also be any valid type of brush.
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POLYGON
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No, WPF does not have a triangle shape. What it does have is a Polygon, where you can specify multiple lines to make up the shape. Here s the XAML for our triangle:
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<Polygon Fill="Red" Canvas.Left = "100" Canvas.Top="30" Points="20 0 40 40 0 40"/>
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Notice the Points property This is a handy shortcut that XAML allows for specifying a series of values like points. We could have also written this out the long way:
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<Polygon Fill="Red" Canvas.Left = "100" Canvas.Top="30" > <Polygon.Points> <Point X="20" Y="0"/> <Point X="40" Y="40"/> <Point X="0" Y="40"/> </Polygon.Points> </Polygon>
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Drawing
This code would do exactly the same thing. Notice that we don t have to close the shape (by adding in the starting point at the end). Polygons are always closed shapes. The Points collection does show up in the property editor; but, if you use the singleline notation, it isn t editable.
LINE
OK, so this one is pretty obvious, even in this list of pretty obvious things. But, it does have one thing that might be tricky. Here s the XAML:
<Line Stroke="Purple" X1="40" X2="0" Y1="0" Y2="120" Canvas.Top="40" Canvas.Left="151" />
A line is drawn from the first point (X1, Y1) to the second point (X2, Y2). But, notice that we re also setting the Canvas.Top and Canvas.Left properties. We have two different sets of coordinates to deal with here. The Canvas coordinates can be thought of as positioning a rectangular shape, The line is drawn inside that rectangle. The upperleft corner of that rectangle is position 0, 0 as far as the line is concerned; as long as no overriding Width and Height are specified, the rectangle will be as big as it needs to be to hold the entire line.
POLYLINE
A Polyline is much like a Polygon, except that the shape doesn t have to be closed. As with a single line, the points are relative to a rectangle that s moved by setting the Canvas Left and Top properties. For our example, we use the verbose notation:
<Polyline Stroke="Brown" StrokeThickness="4" StrokeDashArray="1 1" Canvas.Left="119" Canvas.Top="170" > <Polyline.Points> <Point X="0" Y="0"/> <Point X="30" Y="30"/> <Point X="60" Y="20"/> <Point X="100" Y="50"/> </Polyline.Points> </Polyline>
Notice that we specify a StrokeDashArray to get the dash effect. The units in the dash array are based on the thickness of the Stroke; they say something like have a dash as long as the line is thick, and then a space as long as the line is thick. If we changed the values to 2 1 , that would give us a dash twice as long as the dash is thick (8 pixels) and a space 1 thickness wide (4 pixels). It s an array, so you can do things like 2 1 4 2 8 4 if you have the desire to do so. You can also specify a bunch of other things, via other Stroke properties, about the pen2 used to draw the lines. You can add end caps to the lines, control what happens at the join points, and so on. Just look at all the StrokeXXX properties via IntelliSense.
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