Telerik開發的chart功能異常強大 用戶可以自行在商店搜索“UI for uwp demos”。

下面我就結合以下我的軟件，來說明一下餅狀圖的實現。

看看效果：

先看一下Xaml代碼實現

<ScrollViewer Grid.Row="1" VerticalScrollBarVisibility="Hidden">
            <StackPanel x:Name="spBalanceAndChart" Margin="0,17,0,0" CornerRadius="7"
 
 HorizontalAlignment="Center" VerticalAlignment="Center">

                <TextBlock x:Uid="tbChartHeader" x:Name="tbChartHeader" Text="ChartHeader" FontSize="30" FontWeight="ExtraBold" HorizontalAlignment="Stretch" TextAlignment="Center" TextWrapping="Wrap"/>

                <StackPanel 
 
Orientation="Horizontal" HorizontalAlignment="Center">
                    <chart:RadPieChart x:Name="chart" ClipToBounds="False" PaletteName="DefaultDark" Margin="38,38,38,0" Height="270" Width="270">
                        <chart:DoughnutSeries x:Name="MyDoughnutSeries" ShowLabels="True"
 
 >
                            <chart:DoughnutSeries.ValueBinding>
                                <chart:PropertyNameDataPointBinding PropertyName="Value"/>
                            </chart:DoughnutSeries.ValueBinding>
                            <chart:DoughnutSeries.LegendTitleBinding >
                                <chart:PropertyNameDataPointBinding PropertyName="Title"/>
                            </chart:DoughnutSeries.LegendTitleBinding>
                        </chart:DoughnutSeries>
                    </chart:RadPieChart>

                    <primitives:RadLegendControl LegendProvider="{Binding ElementName=chart}" VerticalAlignment="Center">
                        <primitives:RadLegendControl.ItemsPanel>
                            <ItemsPanelTemplate>
                                <StackPanel Orientation="Vertical"/>
                            </ItemsPanelTemplate>
                        </primitives:RadLegendControl.ItemsPanel>
                        <primitives:RadLegendControl.ItemTemplate>
                            <DataTemplate>
                                <StackPanel Orientation="Horizontal">
                                    <Ellipse Fill="{Binding Fill}" Stroke="{Binding Stroke}"
                                    StrokeThickness="1" Width="10" Height="10"/>
                                    <TextBlock Text="{Binding Title}" Foreground="{Binding Fill}"
                                    Margin="10,0,0,0" FontStyle="Italic"/>
                                </StackPanel>
                            </DataTemplate>
                        </primitives:RadLegendControl.ItemTemplate>
                    </primitives:RadLegendControl>

                </StackPanel>
            </StackPanel>
        </ScrollViewer>

解釋一下，之所以在最外層用ScrollViewer包一下，是因為怕有些設備寬高不夠用、或者用戶將窗口調節的非常小，導致不能查看的情況。最好把滾動條隱藏了，這樣好看。

開頭引用xmlns:chart="using:Telerik.UI.Xaml.Controls.Chart"

後臺，我的操作邏輯是，通過上一篇的簽到數據，選擇一行數據，然後生成累計的簽到圖。

所以先寫一個LoadData的函數

        private void LoadChartData(SignInSummaryData sid)
        {
            var chartItems = new List<ChartDataPoint>();
            if ((Application.Current as App).strCurrentLanguage.ToLower().Equals("zh-cn"))
            {
                // Create a new chart data point for each value you want in the PieSeries
                var sliceOne = new ChartDataPoint { Value = sid.SignInAttendanceRate, Title = "到席" };
                var sliceTwo = new ChartDataPoint { Value = 1 - sid.SignInAttendanceRate, Title = "缺席" };

                // Add those items to the list
                chartItems.Add(sliceOne);
                chartItems.Add(sliceTwo);

                tbChartHeader.Text = sid.Name + "(" + sid.PersonId + ")" + sid.SignInItemName + sid.SignInItemTimes + "簽到情況";
            }
            else
            {
                // Create a new chart data point for each value you want in the PieSeries
                var sliceOne = new ChartDataPoint { Value = sid.SignInAttendanceRate, Title = "Attendance" };
                var sliceTwo = new ChartDataPoint { Value = 1 - sid.SignInAttendanceRate, Title = "Absence" };

                // Add those items to the list
                chartItems.Add(sliceOne);
                chartItems.Add(sliceTwo);

                tbChartHeader.Text = sid.Name + "(" + sid.PersonId + ") " + sid.SignInItemName + sid.SignInItemTimes + " Attendance Chart";
            }

            MyDoughnutSeries.ItemsSource = chartItems;

        }

然後在 OnNavigatedTo 中調用：

protected override async void OnNavigatedTo(NavigationEventArgs e)
        {
            SignInSummaryData sid = null;
            if (e.Parameter != null)
            {
                sid = e.Parameter as SignInSummaryData;
                LoadChartData(sid);
            }
        }

所以和上一篇文章聯系氣來，連貫的操作gif如下圖

UWP 使用Telerik Chart控件