WPF中自带有长条形的进度条,大部分场景都算适用,但是仍然有一部分空间小的场景不太合适,此时我们想到安卓上常用的环形进度条,美观,又不占空间。
那么WPF中的环形进度条控件在哪呢?
很遗憾,自带组件中没有,这需要我们自己绘制。
环形进度条的核心在于根据百分比绘制弧形长度,在WPF中,PathGeometry可以绘制复杂形状,其中ArcSegment专门用于画弧形。
示例工程直接下载:https://download.csdn.net/download/u010875635/10791096
示例动画:
ArcSegment的弧形有几个重要参数,起点(一般在PathFigure中设置,ArcSegment属于PathFigure一部分)、两个半径、是否优势弧(大于180度为优势弧)、终点、旋转角度等。
我们根据角度百分比计算弧长终点,由于弧长虽然是线性增长,但对应的终点X、Y坐标并非是线性变化,我们需要区分4个象限来计算终点。
我们将弧形放置在一个方形的Grid中,半边长为R,设置弧形进度条的粗细为x,设置弧形半径为r(r要小于R-x),起始点坐标为 (leftStart, topStart)
一、第一象限终点计算
第一象限终点坐标为:X = leftStart + r*cos(α); Y = topStart + r*sin(α);
二、第二象限终点计算
第二象限终点坐标为:X = leftStart + r*cos(α); Y = topStart + r + r*sin(α);
三、第三象限终点计算
第三象限终点坐标为:X = leftStart - r*sin(α); Y = topStart + r + r*cos(α);
四、第四象限终点计算
第四象限终点坐标为:X = leftStart - r*cos(α); Y = topStart + r - r*sin(α);
注意100%时,终点与起点不要重合,最好偏移极小数值(太大弧形不好看),然后闭合图形,否则无法组合成圆。
详细代码如下:
一、自定义控件
前台:
<UserControl x:Class="BeatfanControls.ProcessBars.CycleProcessBar1"
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:BeatfanControls.ProcessBars"
mc:Ignorable="d" >
<Viewbox>
<Grid Width="34" Height="34">
<Path Name="myCycleProcessBar1" Data="M17,3 A14,14 0 0 1 16,3 " Stroke="Green" StrokeThickness="3" Height="34" Width="34" VerticalAlignment="Center" HorizontalAlignment="Center">
</Path>
<Label Name="lbValue" Content="50%" HorizontalAlignment="Center" VerticalAlignment="Center" FontSize="9" />
</Grid>
</Viewbox>
</UserControl>
后台:
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
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;
namespace BeatfanControls.ProcessBars
{
/// <summary>
/// CycleProcessBar1.xaml 的交互逻辑
/// </summary>
public partial class CycleProcessBar1 : UserControl
{
public CycleProcessBar1()
{
InitializeComponent();
}
public double CurrentValue1
{
set { SetValue(value); }
}
/// <summary>
/// 设置百分百,输入小数,自动乘100
/// </summary>
/// <param name="percentValue"></param>
private void SetValue(double percentValue)
{
/*****************************************
方形矩阵边长为34,半长为17
环形半径为14,所以距离边框3个像素
环形描边3个像素
******************************************/
double angel = percentValue * 360; //角度
double radius = 14; //环形半径
//起始点
double leftStart = 17;
double topStart = 3;
//结束点
double endLeft = 0;
double endTop = 0;
//数字显示
lbValue.Content = (percentValue*100).ToString("0") + "%";
/***********************************************
* 整个环形进度条使用Path来绘制,采用三角函数来计算
* 环形根据角度来分别绘制,以90度划分,方便计算比例
***********************************************/
bool isLagreCircle = false; //是否优势弧,即大于180度的弧形
//小于90度
if (angel <= 90)
{
/*****************
*
* *
* * ra
* * * * * * * * *
*
*
*
******************/
double ra = (90 - angel) * Math.PI / 180; //弧度
endLeft = leftStart + Math.Cos(ra) * radius; //余弦横坐标
endTop = topStart + radius - Math.Sin(ra) * radius; //正弦纵坐标
}
else if (angel <= 180)
{
/*****************
*
*
*
* * * * * * * * *
* * ra
* *
* *
******************/
double ra = (angel - 90) * Math.PI / 180; //弧度
endLeft = leftStart + Math.Cos(ra) * radius; //余弦横坐标
endTop = topStart + radius + Math.Sin(ra) * radius;//正弦纵坐标
}
else if (angel <= 270)
{
/*****************
*
*
*
* * * * * * * * *
* *
*ra*
* *
******************/
isLagreCircle = true; //优势弧
double ra = (angel - 180) * Math.PI / 180;
endLeft = leftStart - Math.Sin(ra) * radius;
endTop = topStart + radius + Math.Cos(ra) * radius;
}
else if (angel < 360)
{
/*****************
* *
* *
ra * *
* * * * * * * * *
*
*
*
******************/
isLagreCircle = true; //优势弧
double ra = (angel - 270) * Math.PI / 180;
endLeft = leftStart - Math.Cos(ra) * radius;
endTop = topStart + radius - Math.Sin(ra) * radius;
}
else
{
isLagreCircle = true; //优势弧
endLeft = leftStart-0.001; //不与起点在同一点,避免重叠绘制出非环形
endTop = topStart;
}
Point arcEndPt = new Point(endLeft, endTop); //结束点
Size arcSize = new Size(radius, radius);
SweepDirection direction = SweepDirection.Clockwise; //顺时针弧形
//弧形
ArcSegment arcsegment = new ArcSegment(arcEndPt, arcSize, 0, isLagreCircle, direction, true);
//形状集合
PathSegmentCollection pathsegmentCollection = new PathSegmentCollection();
pathsegmentCollection.Add(arcsegment);
//路径描述
PathFigure pathFigure = new PathFigure();
pathFigure.StartPoint = new Point(leftStart, topStart); //起始地址
pathFigure.Segments = pathsegmentCollection;
//路径描述集合
PathFigureCollection pathFigureCollection = new PathFigureCollection();
pathFigureCollection.Add(pathFigure);
//复杂形状
PathGeometry pathGeometry = new PathGeometry();
pathGeometry.Figures = pathFigureCollection;
//Data赋值
myCycleProcessBar1.Data = pathGeometry;
//达到100%则闭合整个
if (angel == 360)
myCycleProcessBar1.Data = Geometry.Parse(myCycleProcessBar1.Data.ToString() + " z");
}
}
}
二、调用:
前台:
<Window x:Class="CircleProgressBar.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:CircleProgressBar"
xmlns:MyProgress="clr-namespace:BeatfanControls.ProcessBars"
mc:Ignorable="d" Closing="Window_Closing"
Title="环形进度条" Height="350" Width="525">
<Grid >
<Grid.RowDefinitions>
<RowDefinition Height="50*"/>
<RowDefinition Height="10*"/>
</Grid.RowDefinitions>
<MyProgress:CycleProcessBar1 x:Name="circleProgressBar" CurrentValue1="0.9" />
<Button Name="btnStart" Content="开始" Grid.Row="1" HorizontalAlignment="Center" VerticalAlignment="Center" Click="Button_Click" />
</Grid>
</Window>
后台:
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
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;
namespace CircleProgressBar
{
/// <summary>
/// MainWindow.xaml 的交互逻辑
/// </summary>
public partial class MainWindow : Window
{
/// <summary>
/// 定时器
/// </summary>
private System.Windows.Threading.DispatcherTimer m_Timer1 = new System.Windows.Threading.DispatcherTimer();
double m_Percent = 0;
bool m_IsStart = false;
public MainWindow()
{
InitializeComponent();
m_Timer1.Interval = new TimeSpan(0, 0, 0,0,100);
m_Timer1.Tick += M_Timer1_Tick;
}
private void M_Timer1_Tick(object sender, EventArgs e)
{
m_Percent += 0.01;
if (m_Percent > 1)
{
m_Percent = 1;
m_Timer1.Stop();
m_IsStart = false;
StartChange(m_IsStart);
}
circleProgressBar.CurrentValue1 = m_Percent;
}
/// <summary>
/// UI变化
/// </summary>
/// <param name="bState"></param>
private void StartChange(bool bState)
{
if (bState)
btnStart.Content = "停止";
else
btnStart.Content = "开始";
}
private void Button_Click(object sender, RoutedEventArgs e)
{
if (m_IsStart)
{
m_Timer1.Stop();
m_IsStart = false;
}
else
{
m_Percent = 0;
m_Timer1.Start();
m_IsStart = true;
}
StartChange(m_IsStart);
}
private void Window_Closing(object sender, System.ComponentModel.CancelEventArgs e)
{
m_Timer1.Stop();
}
}
}