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WPF仿LiveCharts實現餅圖的繪制_C#教程

作者：驚鏵 ? 更新時間： 2022-09-23 編程語言

每日一笑

下班和實習生一起回家，公交站等車，一乞丐把碗推向實習生乞討。這時，實習生不慌不忙的說了句：“我不要你的錢，你這錢來的也不容易。”?

前言?

有小伙伴需要統計圖。

效果預覽（更多效果請下載源碼體驗）

一、PieControl.cs

using System.Collections.ObjectModel;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Media;
using WpfPieControl.Models;

namespace WpfPieControl
{
    public class PieControl: Control
    {
        public ObservableCollection<PieSegmentModel> PieSegmentModels
        {
            get { return (ObservableCollection<PieSegmentModel>)GetValue(PieSegmentModelsProperty); }
            set { SetValue(PieSegmentModelsProperty, value); }
        }

        public static readonly DependencyProperty PieSegmentModelsProperty =
            DependencyProperty.Register("PieSegmentModels", typeof(ObservableCollection<PieSegmentModel>), typeof(PieControl), new UIPropertyMetadata(OnPieSegmentModelChanged));

        private static void OnPieSegmentModelChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
        {
            PieControl pieControl = d as PieControl;
            if (e.NewValue != null)
            {
                var array = e.NewValue as ObservableCollection<PieSegmentModel>;
                double angleNum = 0;
                foreach (var item in array)
                {
                    var color = new SolidColorBrush((Color)ColorConverter.ConvertFromString(pieControl.ColorArray[array.IndexOf(item)]));
                    item.Color = color;
                    item.StartAngle = angleNum;
                    item.EndAngle = angleNum + item.Value / 100 * 360;
                    angleNum = item.EndAngle;
                }
            }
        }
        /// <summary>
        /// colors
        /// </summary>
        private string[] ColorArray = new string[] { "#FDC006", "#607E89", "#2095F2", "#F34336" };


        /// <summary>
        /// 0~1
        /// </summary>
        public double ArcThickness
        {
            get { return (double)GetValue(ArcThicknessProperty); }
            set { SetValue(ArcThicknessProperty, value); }
        }

        public static readonly DependencyProperty ArcThicknessProperty =
            DependencyProperty.Register("ArcThickness", typeof(double), typeof(PieControl), new PropertyMetadata(1.0));


        static PieControl()
        {
            DefaultStyleKeyProperty.OverrideMetadata(typeof(PieControl), new FrameworkPropertyMetadata(typeof(PieControl)));
        }
    }
}

二、App.xaml

<Style TargetType="{x:Type local:PieControl}">
            <Setter Property="UseLayoutRounding" Value="True" />
            <!--<Setter Property="Background" Value="#252525"/>-->
            <Setter Property="Foreground" Value="White"/>
            <Setter Property="Width" Value="250"/>
            <Setter Property="Height" Value="250"/>
            <Setter Property="Template">
                <Setter.Value>
                    <ControlTemplate TargetType="{x:Type local:PieControl}">
                        <ItemsControl Width="{TemplateBinding Width}" Height="{TemplateBinding Height}" 
                                      ItemsSource="{TemplateBinding PieSegmentModels}"
                                      Background="{TemplateBinding Background}">
                            <ItemsControl.ItemsPanel>
                                <ItemsPanelTemplate>
                                    <Grid IsItemsHost="True"/>
                                </ItemsPanelTemplate>
                            </ItemsControl.ItemsPanel>
                            <ItemsControl.ItemTemplate>
                                <DataTemplate>
                                    <ed:Arc Width="{TemplateBinding Width}" Height="{TemplateBinding Height}"
                                                ArcThickness="{Binding ArcThickness,RelativeSource={RelativeSource FindAncestor,AncestorType=local:PieControl}}" ArcThicknessUnit="Percent"
                                                EndAngle="{Binding EndAngle}"
                                                StartAngle="{Binding StartAngle}"
                                                Stretch="None"
                                                ToolTip="{Binding Name}"
                                                Stroke="{Binding ColorStroke}"
                                                StrokeThickness="2"
                                                Fill="{Binding Color}">
                                    </ed:Arc>
                                </DataTemplate>
                            </ItemsControl.ItemTemplate>
                        </ItemsControl>
                    </ControlTemplate>
                </Setter.Value>
            </Setter>
</Style>

三、MainWindow.xaml

<Window x:Class="WpfPieControl.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        xmlns:local="clr-namespace:WpfPieControl"
        mc:Ignorable="d"
        Title="微信公眾號：WPF開發者" Height="450" Width="800">
    <StackPanel>
        <WrapPanel Margin="10">
            <local:PieControl PieSegmentModels="{Binding PieSegmentModels,RelativeSource={RelativeSource AncestorType=local:MainWindow}}" ArcThickness="1"/>
            <local:PieControl PieSegmentModels="{Binding PieSegmentModels,RelativeSource={RelativeSource AncestorType=local:MainWindow}}" 
                                  Margin="4,0"
                                  ArcThickness="{Binding ElementName=PRAT_Slider,Path=Value}"/>
            <local:PieControl PieSegmentModels="{Binding PieSegmentModels,RelativeSource={RelativeSource AncestorType=local:MainWindow}}" ArcThickness="0.65"/>
        </WrapPanel>
        <Slider Maximum="0.9" Minimum="0.1" x:Name="PRAT_Slider" Margin="10" Width="200"/>
        <Button Content="更新" Click="Button_Click" VerticalAlignment="Bottom" Width="200"/>
    </StackPanel>
</Window>

四、MainWindow.xaml.cs

using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.Linq;
using System.Text;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;
using WpfPieControl.Models;

namespace WpfPieControl
{
    /// <summary>
    /// MainWindow.xaml 的交互邏輯
    /// </summary>
    public partial class MainWindow : Window
    {
        public ObservableCollection<PieSegmentModel> PieSegmentModels
        {
            get { return (ObservableCollection<PieSegmentModel>)GetValue(PieSegmentModelsProperty); }
            set { SetValue(PieSegmentModelsProperty, value); }
        }

        public static readonly DependencyProperty PieSegmentModelsProperty =
            DependencyProperty.Register("PieSegmentModels", typeof(ObservableCollection<PieSegmentModel>), typeof(MainWindow), new PropertyMetadata(null));

        List<ObservableCollection<PieSegmentModel>> collectionList = new List<ObservableCollection<PieSegmentModel>>();
        public MainWindow()
        {
            InitializeComponent();

            PieSegmentModels = new ObservableCollection<PieSegmentModel>();
            var collection1 = new ObservableCollection<PieSegmentModel>();
            collection1.Add(new PieSegmentModel { Name = "一", Value = 10 });
            collection1.Add(new PieSegmentModel { Name = "二", Value = 20 });
            collection1.Add(new PieSegmentModel { Name = "三", Value = 25 });
            collection1.Add(new PieSegmentModel { Name = "四", Value = 45 });
            var collection2 = new ObservableCollection<PieSegmentModel>();
            collection2.Add(new PieSegmentModel { Name = "一", Value = 30 });
            collection2.Add(new PieSegmentModel { Name = "二", Value = 15 });
            collection2.Add(new PieSegmentModel { Name = "三", Value = 10 });
            collection2.Add(new PieSegmentModel { Name = "四", Value = 55 });
            collectionList.AddRange(new[] { collection1, collection2 });

            PieSegmentModels = collectionList[0];
        }
        bool isRefresh = false;
        private void Button_Click(object sender, RoutedEventArgs e)
        {
            if (!isRefresh)
                PieSegmentModels = collectionList[1];
            else
                PieSegmentModels = collectionList[0];
            isRefresh = !isRefresh;

        }
    }
}

原文鏈接：https://www.cnblogs.com/yanjinhua/p/15353711.html

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