今天小编给大家分享一下WPF如何实现雷达图的相关知识点，内容详细，逻辑清晰，相信大部分人都还太了解这方面的知识，所以分享这篇文章给大家参考一下，希望大家阅读完这篇文章后有所收获，下面我们一起来了解一下吧。
一、创建 RadarChart.cs 菜单继承 Control代码如下
RadarChart.cs实现思路如下
1、RadarArray ：存放展示集合 。
2、重写OnRender 。
3、根据三角函数和圆的半径计算出圆上的N个点绘制成多边形GetPolygonPoint()。
4、在绘制多边形的时候因为需要多个大小不一的多边形，则需要多次调用GetPolygonPoint()方法，最外层绘制150，中间层100，中心点层 50。
5、DrawPoints() 方法增加了一个bool参数isDrawText是否绘制Text文本，因为最外侧需要绘制文本。
using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.Globalization;
using System.Linq;
using System.Text;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Media;
using System.Windows.Shapes;
namespace WPFDevelopers.Controls
{
public class RadarChart:Control
{
public ObservableCollection<RadarModel> RadarArray
{
get { return (ObservableCollection<RadarModel>)GetValue(RadarArrayProperty); }
set { SetValue(RadarArrayProperty, value); }
}
public static readonly DependencyProperty RadarArrayProperty =
DependencyProperty.Register("RadarArray", typeof(ObservableCollection<RadarModel>), typeof(RadarChart), new PropertyMetadata(null));
static RadarChart()
{
DefaultStyleKeyProperty.OverrideMetadata(typeof(RadarChart), new FrameworkPropertyMetadata(typeof(RadarChart)));
}
protected override void OnRender(DrawingContext drawingContext)
{
DrawPoints(150, drawingContext,true);
DrawPoints(100, drawingContext);
DrawPoints(50, drawingContext);
var myPen = new Pen
{
Thickness = 4,
Brush = Brushes.DodgerBlue
};
myPen.Freeze();
StreamGeometry streamGeometry = new StreamGeometry();
using (StreamGeometryContext geometryContext = streamGeometry.Open())
{
var h = this.ActualHeight / 2;
var w = this.ActualWidth / 2;
PointCollection points = new PointCollection();
foreach (var item in RadarArray)
{
var ss = new Point((item.PointValue.X - w) / 100 * item.ValueMax + w,(item.PointValue.Y - h) / 100 * item.ValueMax + h);
points.Add(ss);
}
geometryContext.BeginFigure(points[points.Count - 1], true, true);
geometryContext.PolyLineTo(points, true, true);
}
streamGeometry.Freeze();
SolidColorBrush rectBrush = new SolidColorBrush(Colors.LightSkyBlue);
rectBrush.Opacity = 0.5;
drawingContext.DrawGeometry(rectBrush, myPen, streamGeometry);
}
void DrawPoints(int circleRadius, DrawingContext drawingContext,bool isDrawText = false)
{
var myPen = new Pen
{
Thickness = 2,
Brush = Brushes.Gainsboro
};
myPen.Freeze();
StreamGeometry streamGeometry = new StreamGeometry();
using (StreamGeometryContext geometryContext = streamGeometry.Open())
{
var h = this.ActualHeight / 2;
var w = this.ActualWidth / 2;
PointCollection points = null;
if (isDrawText)
points = GetPolygonPoint(new Point(w, h), circleRadius, RadarArray.Count, drawingContext);
else
points = GetPolygonPoint(new Point(w, h), circleRadius, RadarArray.Count);
geometryContext.BeginFigure(points[points.Count - 1], true, true);
geometryContext.PolyLineTo(points, true, true);
}
streamGeometry.Freeze();
drawingContext.DrawGeometry(null, myPen, streamGeometry);
}
private PointCollection GetPolygonPoint(Point center, double r, int polygonBound, DrawingContext drawingContext = null)
{
double g = 18;
double perangle = 360 / polygonBound;
double pi = Math.PI;
List<Point> values = new List<Point>();
for (int i = 0; i < polygonBound; i++)
{
Point p2 = new Point(r * Math.Cos(g * pi / 180) + center.X, r * Math.Sin(g * pi / 180) + center.Y);
if(drawingContext != null)
{
FormattedText formattedText = new FormattedText(
RadarArray[i].Text,
CultureInfo.CurrentCulture,
FlowDirection.LeftToRight,
new Typeface(new FontFamily("Arial"), FontStyles.Normal, FontWeights.Thin, FontStretches.Normal),
20.001D, Brushes.Black)
{
MaxLineCount = 1,
TextAlignment = TextAlignment.Justify,
Trimming = TextTrimming.CharacterEllipsis
};
RadarArray[i].PointValue = p2;
if (p2.Y > center.Y && p2.X < center.X)
drawingContext.DrawText(formattedText, new Point(p2.X - formattedText.Width - 5, p2.Y - formattedText.Height / 2));
else if (p2.Y < center.Y && p2.X > center.X)
drawingContext.DrawText(formattedText, new Point(p2.X, p2.Y - formattedText.Height));
else if (p2.Y < center.Y && p2.X < center.X)
drawingContext.DrawText(formattedText, new Point(p2.X - formattedText.Width - 5, p2.Y - formattedText.Height));
else if (p2.Y < center.Y && p2.X == center.X)
drawingContext.DrawText(formattedText, new Point(p2.X - formattedText.Width, p2.Y - formattedText.Height));
else
drawingContext.DrawText(formattedText, new Point(p2.X, p2.Y));
}
values.Add(p2);
g += perangle;
}
PointCollection pcollect = new PointCollection(values);
return pcollect;
}
}
}二、创建RadarChartExample.xaml代码如下
<UserControl x:Class="WPFDevelopers.Samples.ExampleViews.RadarChartExample"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:local="clr-namespace:WPFDevelopers.Samples.ExampleViews"
xmlns:wpfdev="https://github.com/yanjinhuagood/WPFDevelopers"
mc:Ignorable="d"
d:DesignHeight="450" d:DesignWidth="800">
<Grid Background="Gainsboro" >
<Border Background="White" Width="500" Height="500">
<Grid Margin="20,10">
<Grid.ColumnDefinitions>
<ColumnDefinition/>
<ColumnDefinition Width="40"/>
</Grid.ColumnDefinitions>
<Grid.RowDefinitions>
<RowDefinition Height="40"/>
<RowDefinition/>
</Grid.RowDefinitions>
<WrapPanel>
<Rectangle Width="6" Height="26" Fill="Black"/>
<TextBlock Text="能力图" FontWeight="Black" FontSize="24" Padding="10,0"/>
</WrapPanel>
<wpfdev:RadarChart Grid.Column="0" Grid.Row="1" RadarArray="{Binding RadarModels,RelativeSource={RelativeSource AncestorType=local:RadarChartExample}}"/>
</Grid>
</Border>
</Grid>
</UserControl>三、创建RadarChartExample.xaml.cs代码如下
ReadrChartExample.cs 思路如下
1、ValueMax 需要注意最小值0，最大值100。
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.Windows;
using System.Windows.Controls;
using WPFDevelopers.Controls;
namespace WPFDevelopers.Samples.ExampleViews
{
/// <summary>
/// RadarChartExample.xaml 的交互逻辑
/// </summary>
public partial class RadarChartExample : UserControl
{
public ObservableCollection<RadarModel> RadarModels
{
get { return (ObservableCollection<RadarModel>)GetValue(RadarModelsProperty); }
set { SetValue(RadarModelsProperty, value); }
}
public static readonly DependencyProperty RadarModelsProperty =
DependencyProperty.Register("RadarModels", typeof(ObservableCollection<RadarModel>), typeof(RadarChartExample), new PropertyMetadata(null));
List<ObservableCollection<RadarModel>> collectionList = new List<ObservableCollection<RadarModel>>();
public RadarChartExample()
{
InitializeComponent();
RadarModels = new ObservableCollection<RadarModel>();
var collection1 = new ObservableCollection<RadarModel>();
collection1.Add(new RadarModel { Text = "击杀", ValueMax = 95});
collection1.Add(new RadarModel { Text = "生存", ValueMax = 80 });
collection1.Add(new RadarModel { Text = "助攻", ValueMax = 70 });
collection1.Add(new RadarModel { Text = "物理", ValueMax = 80 });
collection1.Add(new RadarModel { Text = "魔法", ValueMax = 90 });
collection1.Add(new RadarModel { Text = "防御", ValueMax = 87 });
collection1.Add(new RadarModel { Text = "金钱", ValueMax = 59 });
var collection2 = new ObservableCollection<RadarModel>();
collection2.Add(new RadarModel { Text = "击杀", ValueMax = 59 });
collection2.Add(new RadarModel { Text = "生存", ValueMax = 80 });
collection2.Add(new RadarModel { Text = "助攻", ValueMax = 90 });
collection2.Add(new RadarModel { Text = "物理", ValueMax = 70 });
collection2.Add(new RadarModel { Text = "魔法", ValueMax = 80 });
collection2.Add(new RadarModel { Text = "防御", ValueMax = 90 });
collection2.Add(new RadarModel { Text = "金钱", ValueMax = 66 });
collectionList.AddRange(new[] { collection1, collection2 });
RadarModels = collectionList[0];
}
bool isRefresh = false;
private void Button_Click(object sender, RoutedEventArgs e)
{
if (!isRefresh)
RadarModels = collectionList[1];
else
RadarModels = collectionList[0];
isRefresh = !isRefresh;
}
}
}
以上就是“WPF如何实现雷达图”这篇文章的所有内容，感谢各位的阅读！相信大家阅读完这篇文章都有很大的收获，小编每天都会为大家更新不同的知识，如果还想学习更多的知识，请关注亿速云行业资讯频道。
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