Silverlight - 动画Bezier曲线画线?

时间:2011-04-05 06:19:45

标签: animation silverlight bezier

我正在构建一个小型Silverlight应用程序。在我的应用程序中,我需要绘制线条,类似于附图中显示的线条。

我知道绘制拱形连接线(绿色连接线)的最佳方法是使用贝塞尔曲线。

我的问题是,如何设置线条的绘制(让它们从起始(X,Y)坐标开始到目标坐标)?

附图:

Bezier curves

1 个答案:

答案 0 :(得分:4)

我花了一些时间玩这个,这是可能的。诀窍是你没有为路径设置动画。相反,您最初将路径剪切到零维度的边界区域,然后基本上为剪切区域的高度和宽度设置动画。最终效果看起来像路径从A点动画到B点。

看看下面的XAML示例:

<Canvas x:Name="LayoutRoot" Background="White">
        <Path Stroke="Blue" StrokeThickness="2" StrokeDashArray="10,2" >
            <Path.Data>
                <PathGeometry>
                    <PathGeometry.Figures>
                        <PathFigureCollection>
                            <PathFigure StartPoint="50,50">
                                <PathFigure.Segments>
                                    <PathSegmentCollection>
                                       <BezierSegment
                                           Point1="50,20"
                                           Point2="120,170"
                                           Point3="350,150"
                                       /> 
                                    </PathSegmentCollection>
                                </PathFigure.Segments>
                            </PathFigure>
                        </PathFigureCollection>
                    </PathGeometry.Figures>
                </PathGeometry>
            </Path.Data>
            <Path.Clip>
                <PathGeometry>
                    <PathFigure IsClosed="true">
                        <LineSegment x:Name="seg1" Point="50,50"/>
                        <LineSegment x:Name="seg2" Point="0,0"/>
                        <LineSegment x:Name="seg3" Point="0,0"/>
                        <LineSegment x:Name="seg4" Point="0,0"/>
                    </PathFigure>
                </PathGeometry>
            </Path.Clip>
            <Path.Triggers>
                <EventTrigger RoutedEvent="Path.Loaded">
                    <BeginStoryboard>
                        <Storyboard>
                            <PointAnimation Storyboard.TargetName="seg2" Storyboard.TargetProperty="point" To="350,50" Duration="0:0:2" />
                            <PointAnimation Storyboard.TargetName="seg3" Storyboard.TargetProperty="point" To="350,150" Duration="0:0:2" />
                            <PointAnimation Storyboard.TargetName="seg4" Storyboard.TargetProperty="point" To="50,1500" Duration="0:0:2" />

                        </Storyboard>
                    </BeginStoryboard>
                </EventTrigger>
            </Path.Triggers>
        </Path>
        <Path Fill="Gold" Stroke="Black" StrokeThickness="1">
            <Path.Data>
                <EllipseGeometry Center="50,50" RadiusX="20" RadiusY="20" />
            </Path.Data>
        </Path>
        <Path Fill="Gold" Stroke="Black" StrokeThickness="1">
            <Path.Data>
                <EllipseGeometry Center="350,150" RadiusX="20" RadiusY="20" />
            </Path.Data>
        </Path>
    </Canvas>