http://www.cnblogs.com/potential/archive/2013/05/06/3063316.html
点击其中的一个例子,然后点击live Updates,就可看到数据更新时的过渡效果。但是蛋疼的博客园,不知道为什么,我插入了我原始的xap文件,过渡效果却没有了,每次更新数据时,曲线直接就出来了(中间没有过渡行为),开始的时候以为是上传后xap文件有可能发生了变化,或者进行压缩什么的,或者浏览器解析什么的,于是我把上传到博客园的xap文件又下载下来,然后嵌入到一个htm页面中,发现还是有过度效果的,但是为什么在博客园的日志中就没有呢?整了好久还是没有整明白,求解释!
下面来看看具体实现的过程吧:
首先需要添加SLVisifire.Charts,FJ.Core的引用。然后开始我们正式的工作:
1.定义一个Chart,该Chart即为显示的图表,以及定义一个Timer,用于定时刷新数据。
Chart chart; Random rand = new Random(DateTime.Now.Millisecond); System.windows.Threading.dispatcherTimer timer = new System.windows.Threading.dispatcherTimer();
2.定义一个方法:CreateChart实例化Chart,并完成Chart的相关设置(如:高,宽,曲线样式等等)
/// <summary> /// Function to create a Visifire Chart /// </summary> public voID CreateChart() { try { // Create a new instance of a Chart chart = new Chart(); //添加X,Y坐标的描述 Axis axisX = new Axis() { Title = "月份",FontSize = 18,}; chart.AxesX.Add(axisX); Axis axisY = new Axis() { Title = "实时监测值",FontSize = 16,}; chart.AxesY.Add(axisY); // 设置图表的高宽 chart.WIDth = 640; chart.Height = 300; //line数据更新时的过渡效果 chart.AnimatedUpdate = true; // 定义DatatSerIEs实例,即一条曲线 DataSerIEs dataSerIEs1 = new DataSerIEs(); DataSerIEs dataSerIEs2 = new DataSerIEs(); //只有当SerIEs的个数大于等于2个时Lenged才会生效 dataSerIEs1.LegendText = "CO2"; dataSerIEs2.LegendText = "SO2"; // 设置DataSerIEs样式 dataSerIEs1.RenderAs = RenderAs.Spline; dataSerIEs2.RenderAs = RenderAs.Spline; // 定义数据点 DataPoint dataPoint1; DataPoint dataPoint2; for (int i = 1; i <= 12; i++) { // 实例化数据点 dataPoint1= new DataPoint(); dataPoint2 = new DataPoint(); //设置数据值 dataPoint1.YValue = rand.Next(0,99); dataPoint2.YValue = rand.Next(0,99); //设置X轴显示名称 dataPoint1.AxisXLabel = string.Format("{0} 月",i); dataPoint2.AxisXLabel = string.Format("{0} 月",i); // 添加数据点 dataSerIEs1.DataPoints.Add(dataPoint1); dataSerIEs2.DataPoints.Add(dataPoint2); } // 将DataSerIEs(曲线)添加到Chart中 chart.SerIEs.Add(dataSerIEs1); chart.SerIEs.Add(dataSerIEs2); // 注册Chart Loaded事件,在该事件中设置Timer的间断值及注册Timer Tick事件 chart.Loaded += new RoutedEventHandler(chart_Loaded); } catch (Exception ex) { MessageBox.Show(ex.ToString()); } }
3.我们看到在创建Chart中注册了Loaded事件,在该事件的完成函数我们设置Timer的间断值及注册Timer Tick事件
voID chart_Loaded(object sender,RoutedEventArgs e) { timer.Tick += new EventHandler(timer_Tick); timer.Interval = new TimeSpan(0,0,2000); }
/// <summary> /// Event handler for Tick event of dispatcher Timer /// </summary> /// <param name="sender">System.windows.Threading.dispatcherTimer</param> /// <param name="e">EventArgs</param> voID timer_Tick(object sender,EventArgs e) { for (Int32 i = 0; i < 12; i++) { // 更新曲线数据 chart.SerIEs[0].DataPoints[i].YValue = rand.Next(0,99); chart.SerIEs[1].DataPoints[i].YValue = rand.Next(20,80); } }
4.这里我们再写一个方法:AddChartToMapLayer,该方法用来将Chart添加到地图中
/// <summary> /// Add Chart to Map /// </summary> /// <param name="chart">Chart</param> /// <param name="position">position</param> public voID AddChartToMapLayer(Chart chart,Graphic position) { ElementLayer chartlayer = new ElementLayer(); chartlayer.ID = "ChartLayer"; chartlayer.Opacity = 1; if (Map.Layers["ChartLayer"] != null) { Map.Layers.Remove(Map.Layers["ChartLayer"]); } chart.Titles.Add(new Title() { Text=string.Format("City: {0}",position.Attributes["CITY_name"].ToString ()) }); //获得Graphic的中心坐标 ESRI.ArcGIS.ClIEnt.Geometry.Geometry geometry=position.Geometry; MapPoint mapPoint=new MapPoint ((geometry.Extent.XMax+geometry.Extent.XMin)/2,(geometry.Extent.YMax+geometry.Extent.YMin)/2); //获得图层X,Y方向对应的比例 double cell_X = (Map.Extent.XMax - Map.Extent.XMin) / Map.ActualWIDth; double cell_Y = (Map.Extent.YMax - Map.Extent.YMin) / Map.ActualHeight; //Chart的宽度为500所以,Chart的中心则位于宽度等于250的位置,将Chart向右移动,以防Chart覆盖Graphic Envelope extent = new Envelope(mapPoint.X + (320 + 20) * cell_X,mapPoint.Y,mapPoint.X + (320 + 20) * cell_X,mapPoint.Y); //设置ElementLayer的外包范围 ElementLayer.SetEnvelope(chart,extent); chartlayer.Children.Add(chart); Map.Layers.Add(chartlayer); }
现在准备工作已经完成,下面就调用这些方法来实现上述的功能,我们大体的功能过程是:
当鼠标移入Graphic是就显示其对应的Chart,移除的移除Chart,这里我们注册一下FeatureLayer的MouseEnter和MouseLeave事件就行,我们再后台的XAML中注册这两个事件。
<esri:FeatureLayer ID="MyFeatureLayer" Url="http://sampleserver1.arcgisonline.com/ArcGIS/rest/services/Specialty/ESRI_StatesCitIEsRivers_USA/MapServer/0" Where="POP1990 > 500000" MouseEnter="FeatureLayer_MouseEnter" MouseLeave="FeatureLayer_MouseLeave" Renderer="{StaticResource MySimplePointRenderer}"/>
最后在后台添加如下代码:
private voID FeatureLayer_MouseEnter(object sender,GraphicMouseEventArgs e) { //绘制Chart CreateChart(); //将Chart添加到Map AddChartToMapLayer(chart,e.Graphic); //启动Timer,定时刷新数据 timer.Start(); } private voID FeatureLayer_MouseLeave(object sender,GraphicMouseEventArgs e) { //停止Timer timer.Stop(); //移除ElementLayer if (Map.Layers["ChartLayer"] != null) { Map.Layers.Remove(Map.Layers["ChartLayer"]); } }
后台的XAML代码:
VIEw Code<UserControl x:Class="SilverlightChartDemo.MainPage" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:vsm="clr-namespace:System.windows;assembly=System.windows" xmlns:d="http://schemas.microsoft.com/Expression/blend/2008" xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" xmlns:vc="clr-namespace:Visifire.Charts;assembly=SLVisifire.Charts" mc:Ignorable="d" d:DesignHeight="300" d:DesignWIDth="400" xmlns:esri="http://schemas.esri.com/arcgis/clIEnt/2009"> <GrID x:name="LayoutRoot" Background="White"> <GrID.Resources> <esri:SimpleRenderer x:Key="MySimplePointRenderer"> <esri:SimpleRenderer.Symbol> <esri:SimpleMarkerSymbol Size="15" Style="Circle"> <esri:SimpleMarkerSymbol.ControlTemplate> <ControlTemplate> <GrID x:name="RootElement" RendertransformOrigin="0.5,0.5" WIDth="15" Height="15"> <GrID.Rendertransform> <Scaletransform x:name="customEnlargeRotatingMarkerSymbolScale" ScaleX="1" ScaleY="1" /> </GrID.Rendertransform> <GrID.Resources> <DropShadowEffect x:Key="customEnlargeRotatingMarkerSymbolEffect" /> </GrID.Resources> <vsm:visualstatemanager.VisualStateGroups> <vsm:VisualStateGroup x:name="CommonStates"> <vsm:VisualState x:name="normal"> <Storyboard> <DoubleAnimation BeginTime="00:00:00" Storyboard.Targetname="customEnlargeRotatingMarkerSymbolScale" Storyboard.TargetProperty="ScaleX" To="1" Duration="0:0:0.2" /> <DoubleAnimation BeginTime="00:00:00" Storyboard.Targetname="customEnlargeRotatingMarkerSymbolScale" Storyboard.TargetProperty="ScaleY" To="1" Duration="0:0:0.2" /> <DoubleAnimation BeginTime="00:00:00" Storyboard.Targetname="customEnlargeRotatingMarkerSymbolRotate" Storyboard.TargetProperty="Angle" To="360" Duration="0:0:0.2" /> <DoubleAnimation BeginTime="00:00:00" Storyboard.Targetname="ellipse" Storyboard.TargetProperty="(UIElement.Effect).(DropShadowEffect.ShadowDepth)" To="2" Duration="0:0:0.2" /> </Storyboard> </vsm:VisualState> <vsm:VisualState x:name="MouSEOver"> <Storyboard> <DoubleAnimation BeginTime="00:00:00" Storyboard.Targetname="customEnlargeRotatingMarkerSymbolScale" Storyboard.TargetProperty="ScaleX" To="2" Duration="0:0:0.2" /> <DoubleAnimation BeginTime="00:00:00" Storyboard.Targetname="customEnlargeRotatingMarkerSymbolScale" Storyboard.TargetProperty="ScaleY" To="2" Duration="0:0:0.2" /> <DoubleAnimation BeginTime="00:00:00" Storyboard.Targetname="customEnlargeRotatingMarkerSymbolRotate" Storyboard.TargetProperty="Angle" To="0" Duration="0:0:0.2" /> <DoubleAnimation BeginTime="00:00:00" Storyboard.Targetname="ellipse" Storyboard.TargetProperty="(UIElement.Effect).(DropShadowEffect.ShadowDepth)" To="5" Duration="0:0:0.2" /> </Storyboard> </vsm:VisualState> </vsm:VisualStateGroup> </vsm:visualstatemanager.VisualStateGroups> <Ellipse x:name="ellipse" WIDth="15" Height="15" Fill="Green" stroke="White" strokeThickness="2" HorizontalAlignment="Center" VerticalAlignment="Center" Effect="{StaticResource customEnlargeRotatingMarkerSymbolEffect}"></Ellipse> <Canvas x:name="RotateCanvas" HorizontalAlignment="left" VerticalAlignment="top" WIDth="15" Height="15" RendertransformOrigin="0.5,0.5"> <Canvas.Clip> <EllipseGeometry RadiusX="7.5" RadiusY="7.5" Center="7.5,7.5" /> </Canvas.Clip> <Canvas.Rendertransform> <Rotatetransform x:name="customEnlargeRotatingMarkerSymbolRotate" Angle="360" /> </Canvas.Rendertransform> <line stroke="White" strokeThickness="2" X1="0" Y1="0" X2="15" Y2="15" /> <line stroke="White" strokeThickness="2" X1="0" Y1="15" X2="15" Y2="0" /> </Canvas> </GrID> </ControlTemplate> </esri:SimpleMarkerSymbol.ControlTemplate> </esri:SimpleMarkerSymbol> </esri:SimpleRenderer.Symbol> </esri:SimpleRenderer> </GrID.Resources> <esri:Map Background="White" HorizontalAlignment="Stretch" margin="0" GrID.ColumnSpan="3" name="Map" VerticalAlignment="Stretch" WrapAround="True" Extent="-15000000,2000000,-7000000,8000000"> <esri:Map.Layers> <esri:LayerCollection> <esri:ArcGISTiledMapServiceLayer Url="http://www.arcgisonline.cn/ArcGIS/rest/services/ChinaOnlineCommunity/MapServer" /> <esri:FeatureLayer ID="MyFeatureLayer" Url="http://sampleserver1.arcgisonline.com/ArcGIS/rest/services/Specialty/ESRI_StatesCitIEsRivers_USA/MapServer/0" Where="POP1990 > 500000" MouseEnter="FeatureLayer_MouseEnter" MouseLeave="FeatureLayer_MouseLeave" Renderer="{StaticResource MySimplePointRenderer}"/> </esri:LayerCollection> </esri:Map.Layers> </esri:Map> </GrID></UserControl>
这样我们便实现了上述的效果。
需要注意的几点:
1.Chart控件第一次加载数据的动画效果(一个点一个点添加),只能使用一次,也就是实例化Chart,加载数据时会有这样的效果,之后更新Chart控件的数据不会有类似第一次加载Chart时显示曲线动画效果,而是上面说的过渡效果。
2.注意设置Chart的AnimatedUpdate属性为True,否则数据更新时绘制曲线没有过渡的效果
3.将Chart作为ElementLayer添加到地图中,注意设置ElementLayer的显示位置。
总结:
以上的过程数据都是用Timer组件来定时生成的,当然这里也可以扩展,比如你的数据也可以是通过SQL查询得到。此外,本例没有用到数据绑定,这是因为本文的Chart是动态生成的,每次选择Graphic时都会重新生成Chart.所以没有用数据绑定。当然如果你的Chart是写死的(实例化一次),或者定义在后台的xaml中,那么建议您选择数据绑定的方式,数据绑定的方式也很简单,例如在XAML定义如下的Chart(详见Visifire documentation):
<vc:Chart name="MyChart" WIDth="500" Height="300" theme="theme1"> <vc:Chart.SerIEs> <vc:DataSerIEs RenderAs="Column" DataSource="{Binding}"> <vc:DataSerIEs.DataMapPings> <vc:DataMapPing Membername="XValue" Path="Key"></vc:DataMapPing> <vc:DataMapPing Membername="YValue" Path="Value"></vc:DataMapPing> </vc:DataSerIEs.DataMapPings> </vc:DataSerIEs> </vc:Chart.SerIEs></vc:Chart>
在后台添加如下代码:
public partial class Page : UserControl{ public Page() { InitializeComponent(); for (int i = 0; i < 10; i++) { values.Add(new keyvaluePair<double,double>(i,i + 1)); } MyChart.DataContext = values; } Random rand = new Random(); ObservableCollection<keyvaluePair<Double,Double>> values = new ObservableCollection<keyvaluePair<double,double>>();}
这样便可以实现Chart曲线的数据绑定。
PS:有那么一段时间没有用Visifire了,很多又忘记了,以上算是自己的一个总结,同时很多人也问个类似的效果怎么做,在此和大家分享一下,鉴于时间和知识的关系,疏漏和错误在所难免,还望各位指正。
//关于解决地图缩放时Chart偏移的问题。
1.注册Map的ExtentChanging事件,然后在事件完成函数中重新设定Elmentlayer的Envelop,代码如下:
private voID Map_ExtentChanging(object sender,ExtentEventArgs e) { double cell_X = (Map.Extent.XMax - Map.Extent.XMin) / Map.ActualWIDth; ESRI.ArcGIS.ClIEnt.Geometry.Geometry geometry = selectedGraphic.Geometry; MapPoint mapPoint = new MapPoint((geometry.Extent.XMax + geometry.Extent.XMin) / 2,(geometry.Extent.YMax + geometry.Extent.YMin) / 2); Envelope extent = new Envelope(mapPoint.X + (320 + 20) * cell_X,mapPoint.Y); Chart Mychart = chartlayer.Children[0] as Chart; ElementLayer.SetEnvelope(Mychart,extent); }总结
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