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WPF使用DrawingContext實現(xiàn)繪制刻度條_C#教程

作者：驚鏵 ? 更新時間： 2022-11-07 編程語言

WPF 使用 DrawingContext 繪制刻度條

  • 框架使用大于等于.NET40；
  • Visual Studio 2022;
  • 項目使用?MIT?開源許可協(xié)議；
  • 定義Interval步長、SpanInterval間隔步長、MiddleMask中間步長。
  • 當(dāng)步長/?間隔步長=?需要繪制的小刻度。
  • 循環(huán)繪制小刻度，判斷當(dāng)前j并取中間步長的模，如果模！=零就繪制中高線。
  • 從StartValue?開始繪制刻度到EndValue?結(jié)束刻度。
  • CurrentGeometry?重新繪制當(dāng)前刻度的Path值。
  • CurrentValue?當(dāng)前值如果發(fā)生變化時則去重新CurrentGeometry?。

1） 準(zhǔn)備Ruler.cs如下：

using?System;
using?System.Windows;
using?System.Windows.Controls;
using?System.Windows.Media;

namespace?WPFDevelopers.Controls
{
????public?class?Ruler?:?Control
????{
????????public?static?readonly?DependencyProperty?IntervalProperty?=
????????????DependencyProperty.Register("Interval",?typeof(double),?typeof(Ruler),?new?UIPropertyMetadata(30.0));


????????public?static?readonly?DependencyProperty?SpanIntervalProperty?=
????????????DependencyProperty.Register("SpanInterval",?typeof(double),?typeof(Ruler),?new?UIPropertyMetadata(5.0));


????????public?static?readonly?DependencyProperty?MiddleMaskProperty?=
????????????DependencyProperty.Register("MiddleMask",?typeof(int),?typeof(Ruler),?new?UIPropertyMetadata(2));

????????public?static?readonly?DependencyProperty?CurrentValueProperty?=
????????????DependencyProperty.Register("CurrentValue",?typeof(double),?typeof(Ruler),
????????????????new?UIPropertyMetadata(OnCurrentValueChanged));

????????public?static?readonly?DependencyProperty?StartValueProperty?=
????????????DependencyProperty.Register("StartValue",?typeof(double),?typeof(Ruler),?new?UIPropertyMetadata(120.0));

????????public?static?readonly?DependencyProperty?EndValueProperty?=
????????????DependencyProperty.Register("EndValue",?typeof(double),?typeof(Ruler),?new?UIPropertyMetadata(240.0));

????????public?static?readonly?DependencyProperty?CurrentGeometryProperty?=
????????????DependencyProperty.Register("CurrentGeometry",?typeof(Geometry),?typeof(Ruler),
????????????????new?PropertyMetadata(Geometry.Parse("M?257,0?257,25?264,49?250,49?257,25")));

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

????????public?Ruler()
????????{
????????????Loaded?+=?Ruler_Loaded;
????????}

????????public?double?Interval
????????{
????????????get?=>?(double)GetValue(IntervalProperty);

????????????set?=>?SetValue(IntervalProperty,?value);
????????}

????????public?double?SpanInterval
????????{
????????????get?=>?(double)GetValue(SpanIntervalProperty);

????????????set?=>?SetValue(SpanIntervalProperty,?value);
????????}

????????public?int?MiddleMask
????????{
????????????get?=>?(int)GetValue(MiddleMaskProperty);

????????????set?=>?SetValue(MiddleMaskProperty,?value);
????????}

????????public?double?CurrentValue
????????{
????????????get?=>?(double)GetValue(CurrentValueProperty);

????????????set
????????????{
????????????????SetValue(CurrentValueProperty,?value);
????????????????PaintPath();
????????????}
????????}

????????public?double?StartValue
????????{
????????????get?=>?(double)GetValue(StartValueProperty);

????????????set?=>?SetValue(StartValueProperty,?value);
????????}

????????public?double?EndValue
????????{
????????????get?=>?(double)GetValue(EndValueProperty);

????????????set?=>?SetValue(EndValueProperty,?value);
????????}

????????public?Geometry?CurrentGeometry
????????{
????????????get?=>?(Geometry)GetValue(CurrentGeometryProperty);

????????????set?=>?SetValue(CurrentGeometryProperty,?value);
????????}

????????private?static?void?OnCurrentValueChanged(DependencyObject?d,?DependencyPropertyChangedEventArgs?e)
????????{
????????????var?ruler?=?d?as?Ruler;
????????????ruler.CurrentValue?=?Convert.ToDouble(e.NewValue);
????????}

????????protected?override?void?OnRender(DrawingContext?drawingContext)
????????{
????????????RenderOptions.SetEdgeMode(this,?EdgeMode.Aliased);
????????????var?nextLineValue?=?0d;
????????????var?one_Width?=?ActualWidth?/?((EndValue?-?StartValue)?/?Interval);

????????????for?(var?i?=?0;?i?<=?(EndValue?-?StartValue)?/?Interval;?i++)
????????????{
????????????????var?numberText?=?DrawingContextHelper.GetFormattedText((StartValue?+?i?*?Interval).ToString(),
????????????????????(Brush)DrawingContextHelper.BrushConverter.ConvertFromString("#FFFFFF"),?FlowDirection.LeftToRight,
????????????????????10);
????????????????drawingContext.DrawText(numberText,?new?Point(i?*?one_Width?-?8,?0));
????????????????drawingContext.DrawLine(new?Pen(new?SolidColorBrush(Colors.White),?1),?new?Point(i?*?one_Width,?25),
????????????????????new?Point(i?*?one_Width,?ActualHeight?-?2));
????????????????var?cnt?=?Interval?/?SpanInterval;
????????????????for?(var?j?=?1;?j?<=?cnt;?j++)
????????????????????if?(j?%?MiddleMask?==?0)
????????????????????????drawingContext.DrawLine(new?Pen(new?SolidColorBrush(Colors.White),?1),
????????????????????????????new?Point(j?*?(one_Width?/?cnt)?+?nextLineValue,?ActualHeight?-?2),
????????????????????????????new?Point(j?*?(one_Width?/?cnt)?+?nextLineValue,?ActualHeight?-?10));
????????????????????else
????????????????????????drawingContext.DrawLine(new?Pen(new?SolidColorBrush(Colors.White),?1),
????????????????????????????new?Point(j?*?(one_Width?/?cnt)?+?nextLineValue,?ActualHeight?-?2),
????????????????????????????new?Point(j?*?(one_Width?/?cnt)?+?nextLineValue,?ActualHeight?-?5));

????????????????nextLineValue?=?i?*?one_Width;
????????????}
????????}

????????private?void?Ruler_Loaded(object?sender,?RoutedEventArgs?e)
????????{
????????????PaintPath();
????????}

????????private?void?PaintPath()
????????{
????????????var?d_Value?=?CurrentValue?-?StartValue;
????????????var?one_Value?=?ActualWidth?/?(EndValue?-?StartValue);
????????????var?x_Point?=?one_Value?*?d_Value?+?((double)Parent.GetValue(ActualWidthProperty)?-?ActualWidth)?/?2d;
????????????CurrentGeometry?=
????????????????Geometry.Parse($"M?{x_Point},0?{x_Point},25?{x_Point?+?7},49?{x_Point?-?7},49?{x_Point},25");
????????}
????}
}

2） 使用RulerControlExample.xaml.cs如下：

<UserControl?x:Class="WPFDevelopers.Samples.ExampleViews.RulerControlExample"
?????????????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/WPFDevelopersOrg/WPFDevelopers"
?????????????mc:Ignorable="d"?
?????????????d:DesignHeight="450"?d:DesignWidth="800">
????<Grid>
????????<Slider?x:Name="PART_Slider"?IsSnapToTickEnabled="True"
????????????????Value="40"
????????????????Minimum="10"
????????????????Maximum="210"/>
????????<UniformGrid?Rows="3">
????????????<Grid?Background="{StaticResource?CircularDualSolidColorBrush}"?Height="51"?Margin="40,0">
????????????????<Path?Stroke="{StaticResource?SuccessPressedSolidColorBrush}"?StrokeThickness="1"?Fill="{StaticResource?SuccessPressedSolidColorBrush}"
??????????????????Data="{Binding?ElementName=PART_Ruler,?Path=CurrentGeometry,Mode=TwoWay}"?/>
????????????????<wpfdev:Ruler?x:Name="PART_Ruler"?Margin="40,0"?Interval="20"?StartValue="10"?EndValue="210"
??????????????????????????CurrentValue="{Binding?ElementName=PART_Slider,Path=Value,Mode=TwoWay}"/>
????????????</Grid>
????????????<Grid?Background="{StaticResource?DangerPressedSolidColorBrush}"?Height="51"?Margin="40,0">
????????????????<Path?Stroke="{StaticResource?SuccessPressedSolidColorBrush}"?StrokeThickness="1"?Fill="{StaticResource?SuccessPressedSolidColorBrush}"
??????????????????Data="{Binding?ElementName=PART_Ruler1,?Path=CurrentGeometry,Mode=TwoWay}"?/>
????????????????<wpfdev:Ruler?x:Name="PART_Ruler1"?Margin="40,0"?Interval="20"?StartValue="10"?EndValue="210"
??????????????????????????CurrentValue="{Binding?ElementName=PART_Slider,Path=Value,Mode=TwoWay}"/>
????????????</Grid>
????????????<Grid?Background="{StaticResource?WarningPressedSolidColorBrush}"?Height="51"?Margin="40,0">
????????????????<Path?Stroke="{StaticResource?SuccessPressedSolidColorBrush}"?StrokeThickness="1"?Fill="{StaticResource?SuccessPressedSolidColorBrush}"
??????????????????Data="{Binding?ElementName=PART_Ruler2,?Path=CurrentGeometry,Mode=TwoWay}"?/>
????????????????<wpfdev:Ruler?x:Name="PART_Ruler2"?Margin="40,0"?Interval="20"?StartValue="10"?EndValue="210"
??????????????????????????CurrentValue="{Binding?ElementName=PART_Slider,Path=Value,Mode=TwoWay}"/>
????????????</Grid>
????????</UniformGrid>
????????
????????
????</Grid>
</UserControl>

原文鏈接：https://mp.weixin.qq.com/s/MUHo6TIlDl1xYM_ERa4MNQ

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