Msdn tutorial short film WPF 16 (Path)

Animation path-Path

The path has a date attribute, which is used to obtain or set the geometry of the specified shape.

So we draw a circle and an elliptical path. The circle moves on the elliptical path. First we draw a circle.

<Ellipse X: Name ="E1"Stroke ="Black"Width ="50"Height ="50"Fill ="Red"Margin ="0, 0, 228,211"> </Ellipse>

Draw a path

<Path X: Name ="P1"Stroke ="Blue"> <Path. Data> <ellipsegeometry X: Name ="Eg1"Center ="120,100"Radiusx ="100"Radiusy ="50"> </Ellipsegeometry> </path. Data> </path>
Here, the ellipsegeometry in this path is named eg1, which will be used later. Now we can perform rendertransform On This ellipse, as shown below: Code .

<Ellipse X: Name ="E1"Stroke ="Black"Width ="50"Height ="50"Fill ="Red"Margin ="0, 0, 228,211">
 
 
<Ellipse. rendertransform>
 
 
<Transformgroup>
 
<Translatetransform x ="-25"Y ="-15"/>
 
 
<Matrixtransform X: Name ="M1"/>
 
 
</Transformgroup>
 
 
</Ellipse. rendertransform>
 
<Ellipse. triggers>
 
 
<Eventtrigger routedevent ="Page. Loaded">
 
 
<Beginstoryboard>
 
 
<Storyboard X: Name ="S1"Repeatbehavior ="Forever">
 
<Matrixanimationusingpath X: Name ="Ma1"
 
 
Storyboard. targetname ="M1"
 
 
Storyboard. targetproperty ="Matrix"
 
Duration ="0: 0: 5"/>
 
 
</Storyboard>
 
 
</Beginstoryboard>
 
 
</Eventtrigger>
 
</Ellipse. triggers>
 
 
</Ellipse>
 
 
 
 
Here we use matrixanimationusingpath in storyboard,
 
 
You can use pathgeometry to generate an animation value to animation the value of the matrix attribute. This animation can be used to move a visual object along a path.
 
 
Matrixanimationusingpath is bound to M1 and its attribute is matrix. M1 is matrixtransform, which is
 
 
Creates an arbitrary ry matrix transformation to operate objects or coordinate systems in a two-dimensional plane.
 
 
<Translatetransform x ="-25"Y ="-15"/> Is to adjust the degree of translation for the circle to rotate along the elliptical path.
 
 
Translatetransform: You can change the origin of the coordinate system by making the translation of the transformation matrix of graphics left by the specified translation.
 
 
We also need to use a button to load and start this path.
 
Private VoidButton#click (ObjectSender, routedeventargs e) {pathgeometry =NewPathgeometry (); pathgeometry. addgeometry (eg1); ma1.pathgeometry = pathgeometry; s1.begin (E1 );}
 
 
Press F5 for debugging.