基于WPF实现颜色选择器控件
更新时间:2023年08月18日 08:58:17 作者:WPF开发者
这篇文章主要介绍了如何基于WPF实现简单的颜色选择器控件,文中的示例代码讲解详细,对我们学习或工作有一定帮助,需要的小伙伴可以参考一下
WPF 实现颜色选择器控件
- 框架使用
.NET4 至 .NET6
; Visual Studio 2022
;
实现代码
1)新增 ColorPicker.cs
代码如下:
- 包含一个Slider(用于选择色调)、一个Canvas(用于选择饱和度和亮度)、一个Thumb(拖动选择饱和度和亮度的指示器)和一个Button(用于切换颜色类型)。
- 通过使用ColorPicker控件,用户可以选择一个颜色,并且可以通过绑定SelectedColor属性来获取所选颜色。这个属性是一个依赖属性,支持双向绑定,并且当颜色发生改变时会触发SelectedColorChanged事件。
- ColorType属性用于指定颜色类型,可以选择RGB、HSL或HEX三种类型之一。当用户点击Button时,可以循环切换颜色类型。
- 在控件的模板中,通过TemplatePart特性标记了四个重要的子元素:HueSlider、Canvas、Thumb和Button。在OnApplyTemplate方法中,根据模板找到这些子元素,并注册相应的事件处理程序。
- 控件通过使用颜色转换工具类ColorUtil实现颜色的转换和计算。当用户在Canvas上点击或拖动Thumb时,会计算得到相应的HSB(色调、饱和度、亮度)值,并将其设置为依赖属性HSB的值。然后根据HSB的值计算出对应的颜色,并更新SelectedColor属性的值。
using System; using System.Windows; using System.Windows.Controls; using System.Windows.Controls.Primitives; using System.Windows.Input; using System.Windows.Media; using WPFDevelopers.Utilities; namespace WPFDevelopers.Controls { [TemplatePart(Name = HueSliderColorTemplateName, Type = typeof(Slider))] [TemplatePart(Name = CanvasTemplateName, Type = typeof(Canvas))] [TemplatePart(Name = ThumbTemplateName, Type = typeof(Thumb))] [TemplatePart(Name = ButtonTemplateName, Type = typeof(Button))] public class ColorPicker : Control { private const string HueSliderColorTemplateName = "PART_HueSlider"; private const string CanvasTemplateName = "PART_Canvas"; private const string ThumbTemplateName = "PART_Thumb"; private const string ButtonTemplateName = "PART_Button"; private static readonly DependencyPropertyKey HueColorPropertyKey = DependencyProperty.RegisterReadOnly("HueColor", typeof(Color), typeof(ColorPicker), new PropertyMetadata(Colors.Red)); public static readonly DependencyProperty HueColorProperty = HueColorPropertyKey.DependencyProperty; public static readonly DependencyProperty SelectedColorProperty = DependencyProperty.Register("SelectedColor", typeof(Color), typeof(ColorPicker), new FrameworkPropertyMetadata(Colors.Red, FrameworkPropertyMetadataOptions.BindsTwoWayByDefault, OnSelectedColorChanged)); private static readonly DependencyPropertyKey HSBPropertyKey = DependencyProperty.RegisterReadOnly("HSB", typeof(HSB), typeof(ColorPicker), new PropertyMetadata(new HSB())); public static readonly DependencyProperty HSBHProperty = HSBPropertyKey.DependencyProperty; public static readonly DependencyProperty ColorTypeProperty = DependencyProperty.Register("ColorType", typeof(ColorTypeEnum), typeof(ColorPicker), new PropertyMetadata(ColorTypeEnum.RGB)); private Button _button; private Canvas _canvas; private Slider _hueSliderColor; private bool _isInnerUpdateSelectedColor; private Thumb _thumb; private ColorTypeEnum[] colorTypeEnums; private int currentGridStateIndex; static ColorPicker() { DefaultStyleKeyProperty.OverrideMetadata(typeof(ColorPicker), new FrameworkPropertyMetadata(typeof(ColorPicker))); } public Color HueColor => (Color) GetValue(HueColorProperty); public Color SelectedColor { get => (Color) GetValue(SelectedColorProperty); set => SetValue(SelectedColorProperty, value); } public HSB HSB => (HSB) GetValue(HSBHProperty); public ColorTypeEnum ColorType { get => (ColorTypeEnum) GetValue(ColorTypeProperty); set => SetValue(ColorTypeProperty, value); } private static void OnSelectedColorChanged(DependencyObject d, DependencyPropertyChangedEventArgs e) { var ctrl = d as ColorPicker; if (ctrl._isInnerUpdateSelectedColor) { ctrl._isInnerUpdateSelectedColor = false; return; } var color = (Color) e.NewValue; double h = 0, s = 0, b = 0; ColorUtil.HsbFromColor(color, ref h, ref s, ref b); var hsb = new HSB {H = h, S = s, B = b}; ctrl.SetValue(HueColorPropertyKey, ColorUtil.ColorFromHsb(hsb.H, 1, 1)); ctrl.SetValue(HSBPropertyKey, hsb); Canvas.SetLeft(ctrl._thumb, s * ctrl._canvas.ActualWidth - ctrl._thumb.ActualWidth / 2); Canvas.SetTop(ctrl._thumb, (1 - b) * ctrl._canvas.ActualHeight - ctrl._thumb.ActualHeight / 2); ctrl._hueSliderColor.Value = 1 - h; } public override void OnApplyTemplate() { base.OnApplyTemplate(); if (_hueSliderColor != null) _hueSliderColor.ValueChanged -= HueSliderColor_OnValueChanged; _canvas = GetTemplateChild(CanvasTemplateName) as Canvas; if (_canvas != null) { _canvas.Loaded += Canvas_Loaded; _canvas.MouseUp += Canvas_MouseUp; } _thumb = GetTemplateChild(ThumbTemplateName) as Thumb; if (_thumb != null) _thumb.DragDelta += Thumb_DragDelta; _hueSliderColor = GetTemplateChild(HueSliderColorTemplateName) as Slider; if (_hueSliderColor != null) _hueSliderColor.ValueChanged += HueSliderColor_OnValueChanged; _button = GetTemplateChild(ButtonTemplateName) as Button; currentGridStateIndex = 0; colorTypeEnums = (ColorTypeEnum[]) Enum.GetValues(typeof(ColorTypeEnum)); if (_button != null) _button.Click += Button_Click; } private void Button_Click(object sender, RoutedEventArgs e) { currentGridStateIndex = (currentGridStateIndex + 1) % colorTypeEnums.Length; ColorType = colorTypeEnums[currentGridStateIndex]; } private void Canvas_MouseUp(object sender, MouseButtonEventArgs e) { var canvasPosition = e.GetPosition(_canvas); GetHSB(canvasPosition); } private void Canvas_MouseDown(object sender, MouseButtonEventArgs e) { var canvasPosition = e.GetPosition(_canvas); GetHSB(canvasPosition); } private void GetHSB(Point point, bool isMove = true) { var newLeft = point.X - _thumb.ActualWidth / 2; var newTop = point.Y - _thumb.ActualHeight / 2; var thumbW = _thumb.ActualWidth / 2; var thumbH = _thumb.ActualHeight / 2; var canvasRight = _canvas.ActualWidth - thumbW; var canvasBottom = _canvas.ActualHeight - thumbH; if (newLeft < -thumbW) newLeft = -thumbW; else if (newLeft > canvasRight) newLeft = canvasRight; if (newTop < -thumbH) newTop = -thumbH; else if (newTop > canvasBottom) newTop = canvasBottom; if (isMove) { Canvas.SetLeft(_thumb, newLeft); Canvas.SetTop(_thumb, newTop); } var hsb = new HSB { H = HSB.H, S = (newLeft + thumbW) / _canvas.ActualWidth, B = 1 - (newTop + thumbH) / _canvas.ActualHeight }; SetValue(HSBPropertyKey, hsb); var currentColor = ColorUtil.ColorFromAhsb(1, HSB.H, HSB.S, HSB.B); if (SelectedColor != currentColor) { _isInnerUpdateSelectedColor = true; SelectedColor = currentColor; } } private void Thumb_DragDelta(object sender, DragDeltaEventArgs e) { var point = Mouse.GetPosition(_canvas); GetHSB(point); } private void Canvas_Loaded(object sender, RoutedEventArgs e) { var width = (int) _canvas.ActualWidth; var height = (int) _canvas.ActualHeight; var point = new Point(width - _thumb.ActualWidth / 2, -_thumb.ActualHeight / 2); Canvas.SetLeft(_thumb, point.X); Canvas.SetTop(_thumb, point.Y); var hsb = new HSB {H = _hueSliderColor.Value, S = HSB.S, B = HSB.B}; SetValue(HSBPropertyKey, hsb); } private void HueSliderColor_OnValueChanged(object sender, RoutedPropertyChangedEventArgs<double> e) { if (DoubleUtil.AreClose(HSB.H, e.NewValue)) return; var hsb = new HSB {H = 1 - e.NewValue, S = HSB.S, B = HSB.B}; SetValue(HSBPropertyKey, hsb); SetValue(HueColorPropertyKey, ColorUtil.ColorFromHsb(HSB.H, 1, 1)); var newLeft = Canvas.GetLeft(_thumb); var newTop = Canvas.GetTop(_thumb); var point = new Point(newLeft, newTop); GetHSB(point, false); } } public enum ColorTypeEnum { RGB, HSL, HEX } }
2)新增 ColorPicker.xaml
代码如下:
- 在Canvas的背景中使用了DrawingBrush和DrawingGroup来创建渐变和几何形状。
- 创建了一个线性渐变刷(LinearGradientBrush),渐变的起点是(0,0),终点是(1,0)。其中的GradientStop标签指定了两个渐变停止点,一个偏移量为0,颜色为白色,另一个偏移量为1,颜色绑定到了HueColor属性。
- 接下来,同样方式创建了另一个线性渐变刷,渐变的起点是(0,0),终点是(0,1)。GradientStop指定了两个渐变停止点,一个偏移量为0,颜色为透明("#00000000"),另一个偏移量为1,颜色为黑色。
<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:controls="clr-namespace:WPFDevelopers.Controls" xmlns:convert="clr-namespace:WPFDevelopers.Converts" xmlns:helpers="clr-namespace:WPFDevelopers.Helpers" xmlns:input="clr-namespace:System.Windows.Input;assembly=PresentationCore" xmlns:po="http://schemas.microsoft.com/winfx/2006/xaml/presentation/options"> <ResourceDictionary.MergedDictionaries> <ResourceDictionary Source="Basic/ControlBasic.xaml" /> </ResourceDictionary.MergedDictionaries> <convert:ColorToBrushConverter x:Key="WD.ColorToBrushConverter" /> <convert:ColorToRedConverter x:Key="WD.ColorToRedConverter" /> <convert:ColorToGreenConverter x:Key="WD.ColorToGreenConverter" /> <convert:ColorToBlueConverter x:Key="WD.ColorToBlueConverter" /> <convert:ColorTypeToVisibilityConverter x:Key="WD.ColorTypeToVisibilityConverter" /> <convert:ColorToStringConverter x:Key="WD.ColorToStringConverter" /> <convert:HToColorConverter x:Key="WD.HToColorConverter" /> <convert:SToColorConverter x:Key="WD.SToColorConverter" /> <convert:LToColorConverter x:Key="WD.LToColorConverter" /> <LinearGradientBrush x:Key="WD.ColorPickerRainbowBrush" po:Freeze="True"> <GradientStop Color="#FF0000" /> <GradientStop Offset="0.167" Color="#FF00FF" /> <GradientStop Offset="0.334" Color="#0000FF" /> <GradientStop Offset="0.501" Color="#00FFFF" /> <GradientStop Offset="0.668" Color="#00FF00" /> <GradientStop Offset="0.835" Color="#FFFF00" /> <GradientStop Offset="1" Color="#FF0000" /> </LinearGradientBrush> <ControlTemplate x:Key="WD.ColorPickerSliderThumbTemplate" TargetType="Thumb"> <Border Width="{TemplateBinding Width}" Height="{TemplateBinding Height}" Background="Transparent" BorderBrush="White" BorderThickness="3" CornerRadius="{Binding ActualWidth, RelativeSource={RelativeSource Self}, Converter={StaticResource WD.HalfValueConverter}}" /> </ControlTemplate> <Style x:Key="WD.ColorPickerSliderRepeatButtonBaseStyle" TargetType="RepeatButton"> <Setter Property="OverridesDefaultStyle" Value="true" /> <Setter Property="Background" Value="Transparent" /> <Setter Property="Focusable" Value="false" /> <Setter Property="IsTabStop" Value="false" /> <Setter Property="Template"> <Setter.Value> <ControlTemplate TargetType="RepeatButton"> <Rectangle Width="{TemplateBinding Width}" Height="{TemplateBinding Height}" Fill="{TemplateBinding Background}" /> </ControlTemplate> </Setter.Value> </Setter> </Style> <Style x:Key="WD.ColorPickerSlider" TargetType="{x:Type Slider}"> <Setter Property="Background" Value="{StaticResource WD.ColorPickerRainbowBrush}" /> <Setter Property="Stylus.IsPressAndHoldEnabled" Value="false" /> <Setter Property="Orientation" Value="Horizontal" /> <Setter Property="Height" Value="15" /> <Setter Property="Margin" Value="4,0" /> <Setter Property="Template"> <Setter.Value> <ControlTemplate TargetType="{x:Type Slider}"> <controls:SmallPanel> <Border MaxWidth="{TemplateBinding MaxWidth}" Margin="{TemplateBinding Margin}" Background="{TemplateBinding Background}" CornerRadius="2" /> <Track x:Name="PART_Track" Orientation="{TemplateBinding Orientation}"> <Track.DecreaseRepeatButton> <RepeatButton Command="{x:Static Slider.DecreaseLarge}" Style="{StaticResource WD.ColorPickerSliderRepeatButtonBaseStyle}" /> </Track.DecreaseRepeatButton> <Track.IncreaseRepeatButton> <RepeatButton Command="{x:Static Slider.IncreaseLarge}" Style="{StaticResource WD.ColorPickerSliderRepeatButtonBaseStyle}" /> </Track.IncreaseRepeatButton> <Track.Thumb> <Thumb x:Name="Thumb" Width="15" Height="15" Focusable="False" OverridesDefaultStyle="True" Template="{StaticResource WD.ColorPickerSliderThumbTemplate}"> <Thumb.Effect> <DropShadowEffect Opacity=".6" ShadowDepth="0" /> </Thumb.Effect> </Thumb> </Track.Thumb> </Track> </controls:SmallPanel> </ControlTemplate> </Setter.Value> </Setter> </Style> <Style x:Key="WD.ColorPicker" BasedOn="{StaticResource WD.ControlBasicStyle}" TargetType="{x:Type controls:ColorPicker}"> <Setter Property="Width" Value="260" /> <Setter Property="Height" Value="200" /> <Setter Property="Margin" Value="2" /> <Setter Property="BorderThickness" Value="1" /> <Setter Property="BorderBrush" Value="{DynamicResource WD.BaseSolidColorBrush}" /> <Setter Property="Background" Value="{DynamicResource WD.BackgroundSolidColorBrush}" /> <Setter Property="Template"> <Setter.Value> <ControlTemplate TargetType="{x:Type controls:ColorPicker}"> <Border Margin="{TemplateBinding Margin}" Background="{TemplateBinding Background}" BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}"> <Grid> <Grid.RowDefinitions> <RowDefinition /> <RowDefinition Height="Auto" /> <RowDefinition Height="Auto" /> </Grid.RowDefinitions> <Canvas x:Name="PART_Canvas" Margin="1,1,1,0" ClipToBounds="True"> <Canvas.Background> <DrawingBrush> <DrawingBrush.Drawing> <DrawingGroup> <GeometryDrawing> <GeometryDrawing.Brush> <LinearGradientBrush EndPoint="1,0"> <GradientStop Offset="0" Color="White" /> <GradientStop Offset="1" Color="{Binding HueColor, RelativeSource={RelativeSource TemplatedParent}}" /> </LinearGradientBrush> </GeometryDrawing.Brush> <GeometryDrawing.Geometry> <RectangleGeometry Rect="0,0,5,5" /> </GeometryDrawing.Geometry> </GeometryDrawing> <GeometryDrawing> <GeometryDrawing.Brush> <LinearGradientBrush EndPoint="0,1"> <GradientStop Offset="0" Color="#00000000" /> <GradientStop Offset="1" Color="{StaticResource WD.BlackColor}" /> </LinearGradientBrush> </GeometryDrawing.Brush> <GeometryDrawing.Geometry> <RectangleGeometry Rect="0,0,5,5" /> </GeometryDrawing.Geometry> </GeometryDrawing> </DrawingGroup> </DrawingBrush.Drawing> </DrawingBrush> </Canvas.Background> <Thumb x:Name="PART_Thumb" Width="15" Height="15" Background="Transparent" BorderBrush="White" BorderThickness="3"> <Thumb.Template> <ControlTemplate TargetType="{x:Type Thumb}"> <controls:SmallPanel> <Border Background="{TemplateBinding Background}" BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}" CornerRadius="{Binding ActualWidth, RelativeSource={RelativeSource Self}, Converter={StaticResource WD.HalfValueConverter}}" SnapsToDevicePixels="True"> <Border.Effect> <DropShadowEffect Opacity=".6" ShadowDepth="0" /> </Border.Effect> </Border> </controls:SmallPanel> </ControlTemplate> </Thumb.Template> </Thumb> </Canvas> <Grid Grid.Row="1" Margin="6,5,6,0"> <Grid.ColumnDefinitions> <ColumnDefinition Width="Auto" /> <ColumnDefinition /> </Grid.ColumnDefinitions> <Ellipse Width="25" Height="25" Margin="0,0,4,0" Fill="{TemplateBinding SelectedColor, Converter={StaticResource WD.ColorToBrushConverter}}"> <Ellipse.Effect> <DropShadowEffect Opacity=".6" ShadowDepth="0" /> </Ellipse.Effect> </Ellipse> <Slider Name="PART_HueSlider" Grid.Column="1" Width="Auto" IsMoveToPointEnabled="True" LargeChange="0.01" Maximum="1" SmallChange="0.01" Style="{StaticResource WD.ColorPickerSlider}" Value="1" /> </Grid> <Grid Grid.Row="2" Margin="4" VerticalAlignment="Center"> <Grid.ColumnDefinitions> <ColumnDefinition Width="Auto" /> <ColumnDefinition /> </Grid.ColumnDefinitions> <Grid.Resources> <Style TargetType="{x:Type StackPanel}"> <Setter Property="Margin" Value="4,0" /> </Style> <Style x:Key="WD.TextBoxColorPicker" BasedOn="{StaticResource WD.DefaultTextBox}" TargetType="{x:Type TextBox}"> <Setter Property="VerticalContentAlignment" Value="Center" /> <Setter Property="TextAlignment" Value="Center" /> <Setter Property="Width" Value="50" /> </Style> <Style BasedOn="{StaticResource WD.NumericBox}" TargetType="{x:Type controls:NumericBox}"> <Setter Property="VerticalContentAlignment" Value="Center" /> <Setter Property="TextAlignment" Value="Center" /> <Setter Property="Width" Value="50" /> <Setter Property="UpDownButtonsWidth" Value="0" /> <Setter Property="Maximum" Value="255" /> <Setter Property="Minimum" Value="0" /> </Style> <Style TargetType="{x:Type TextBlock}"> <Setter Property="HorizontalAlignment" Value="Center" /> <Setter Property="Foreground" Value="{DynamicResource WD.PrimaryTextSolidColorBrush}" /> <Setter Property="FontSize" Value="10" /> </Style> </Grid.Resources> <Button Name="PART_Button" Grid.Column="0" Width="30" Height="30" Margin="0,0,4,0" helpers:ElementHelper.IsRound="True" Style="{StaticResource WD.NormalButton}"> <controls:PathIcon Kind="UnfoldMore" /> </Button> <UniformGrid Grid.Column="1" Rows="1" Visibility="{Binding ColorType, Mode=TwoWay, RelativeSource={RelativeSource TemplatedParent}, Converter={StaticResource WD.ColorTypeToVisibilityConverter}, ConverterParameter={x:Static controls:ColorTypeEnum.RGB}}"> <StackPanel> <controls:NumericBox Value="{Binding SelectedColor, Mode=TwoWay, RelativeSource={RelativeSource TemplatedParent}, Converter={StaticResource WD.ColorToRedConverter}}" /> <TextBlock Text="R" /> </StackPanel> <StackPanel> <controls:NumericBox Value="{Binding SelectedColor, Mode=TwoWay, RelativeSource={RelativeSource TemplatedParent}, Converter={StaticResource WD.ColorToGreenConverter}}" /> <TextBlock Text="G" /> </StackPanel> <StackPanel> <controls:NumericBox Value="{Binding SelectedColor, Mode=TwoWay, RelativeSource={RelativeSource TemplatedParent}, Converter={StaticResource WD.ColorToBlueConverter}}" /> <TextBlock Text="B" /> </StackPanel> </UniformGrid> <UniformGrid Grid.Column="1" Rows="1" Visibility="{Binding ColorType, Mode=TwoWay, RelativeSource={RelativeSource TemplatedParent}, Converter={StaticResource WD.ColorTypeToVisibilityConverter}, ConverterParameter={x:Static controls:ColorTypeEnum.HSL}}"> <StackPanel> <TextBox helpers:TextBoxHelper.AllowOnlyNumericInput="True" helpers:TextBoxHelper.IsEnterUpdateEnabled="True" helpers:TextBoxHelper.SelectAllOnClick="True" Style="{StaticResource WD.TextBoxColorPicker}" Text="{Binding SelectedColor, Mode=TwoWay, RelativeSource={RelativeSource TemplatedParent}, Converter={StaticResource WD.HToColorConverter}}" /> <TextBlock Text="H" /> </StackPanel> <StackPanel Grid.Column="1"> <TextBox helpers:TextBoxHelper.IsEnterUpdateEnabled="True" helpers:TextBoxHelper.SelectAllOnClick="True" Style="{StaticResource WD.TextBoxColorPicker}" Text="{Binding SelectedColor, Mode=TwoWay, RelativeSource={RelativeSource TemplatedParent}, Converter={StaticResource WD.SToColorConverter}}" /> <TextBlock Text="S" /> </StackPanel> <StackPanel Grid.Column="2"> <TextBox helpers:TextBoxHelper.IsEnterUpdateEnabled="True" helpers:TextBoxHelper.SelectAllOnClick="True" Style="{StaticResource WD.TextBoxColorPicker}" Text="{Binding SelectedColor, Mode=TwoWay, RelativeSource={RelativeSource TemplatedParent}, Converter={StaticResource WD.LToColorConverter}}" /> <TextBlock Text="L" /> </StackPanel> </UniformGrid> <StackPanel Grid.Column="1" Margin="12,0" Visibility="{Binding ColorType, Mode=TwoWay, RelativeSource={RelativeSource TemplatedParent}, Converter={StaticResource WD.ColorTypeToVisibilityConverter}, ConverterParameter={x:Static controls:ColorTypeEnum.HEX}}"> <TextBox helpers:TextBoxHelper.IsEnterUpdateEnabled="True" helpers:TextBoxHelper.SelectAllOnClick="True" MaxLength="9" Text="{Binding SelectedColor, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged, RelativeSource={RelativeSource TemplatedParent}, Converter={StaticResource WD.ColorToStringConverter}}" TextAlignment="Center" /> <TextBlock Text="HEX" /> </StackPanel> </Grid> </Grid> </Border> </ControlTemplate> </Setter.Value> </Setter> </Style> <Style BasedOn="{StaticResource WD.ColorPicker}" TargetType="{x:Type controls:ColorPicker}" /> </ResourceDictionary>
3)新增颜色转换工具类 ColorUtil.cs
代码如下:
- 包含了将 HSL 颜色空间转换为 RGB 颜色空间以及将 RGB 颜色空间转换为 HSL 颜色空间的方法。
- ConvertHSLToColor 方法用于将 HSL 颜色转换为 RGB 颜色。HSLToRgb 方法实现了将 HSL 颜色转换为 RGB 颜色的算法,而 SetColor 方法用于在计算过程中设置颜色值。
- RgbToHSL 方法用于将 RGB 颜色转换为 HSL 颜色。HsbFromColor 方法则实现了从 RGB 颜色获取 HSB(色相、饱和度、亮度)的算法,并修改了传入的引用类型参数。ColorFromAhsb 和 ColorFromHsb 方法分别用于根据 AHSB(透明度、色相、饱和度、亮度)和 HSB 值创建颜色对象。
using System; using System.Windows.Media; using WPFDevelopers.Controls; namespace WPFDevelopers.Utilities { public static class ColorUtil { public static Color ConvertHSLToColor(Color color, double h = double.NaN, double sl = double.NaN, double l = double.NaN) { var hsl = RgbToHSL(color); if (!double.IsNaN(h)) hsl.H = h; if (!double.IsNaN(sl)) hsl.S = sl; if (!double.IsNaN(l)) hsl.L = l; var rgb = HSLToRgb(hsl); return rgb; } private static Color HSLToRgb(HSL hslColor) { var rgbColor = new Color(); if (hslColor.S == 0) { rgbColor.R = (byte) (hslColor.L * 255); rgbColor.G = (byte) (hslColor.L * 255); rgbColor.B = (byte) (hslColor.L * 255); rgbColor.A = (byte) (hslColor.A * 255); return rgbColor; } double t1; if (hslColor.L < 0.5) t1 = hslColor.L * (1.0 + hslColor.S); else t1 = hslColor.L + hslColor.S - hslColor.L * hslColor.S; var t2 = 2.0 * hslColor.L - t1; var h = hslColor.H / 360; var tR = h + 1.0 / 3.0; var r = SetColor(t1, t2, tR); var tG = h; var g = SetColor(t1, t2, tG); var tB = h - 1.0 / 3.0; var b = SetColor(t1, t2, tB); rgbColor.R = (byte) (r * 255); rgbColor.G = (byte) (g * 255); rgbColor.B = (byte) (b * 255); rgbColor.A = (byte) (hslColor.A * 255); return rgbColor; } private static double SetColor(double t1, double t2, double t3) { if (t3 < 0) t3 += 1.0; if (t3 > 1) t3 -= 1.0; double color; if (6.0 * t3 < 1) color = t2 + (t1 - t2) * 6.0 * t3; else if (2.0 * t3 < 1) color = t1; else if (3.0 * t3 < 2) color = t2 + (t1 - t2) * (2.0 / 3.0 - t3) * 6.0; else color = t2; return color; } public static HSL RgbToHSL(Color rgbColor) { var hslColor = new HSL(); var r = (double) rgbColor.R / 255; var g = (double) rgbColor.G / 255; var b = (double) rgbColor.B / 255; var a = (double) rgbColor.A / 255; var min = Math.Min(r, Math.Min(g, b)); var max = Math.Max(r, Math.Max(g, b)); var delta = max - min; if (max == min) { hslColor.H = 0; hslColor.S = 0; hslColor.L = max; return hslColor; } hslColor.L = (min + max) / 2; if (hslColor.L < 0.5) hslColor.S = delta / (max + min); else hslColor.S = delta / (2.0 - max - min); if (r == max) hslColor.H = (g - b) / delta; if (g == max) hslColor.H = 2.0 + (b - r) / delta; if (b == max) hslColor.H = 4.0 + (r - g) / delta; hslColor.H *= 60; if (hslColor.H < 0) hslColor.H += 360; hslColor.A = a; return hslColor; } public static void HsbFromColor(Color C, ref double H, ref double S, ref double B) { var r = C.R / 255d; var g = C.G / 255d; var b = C.B / 255d; var max = Math.Max(Math.Max(r, g), b); var min = Math.Min(Math.Min(r, g), b); var delta = max - min; var hue = 0d; var saturation = DoubleUtil.GreaterThan(max, 0) ? delta / max : 0.0; var brightness = max; if (!DoubleUtil.IsZero(delta)) { if (DoubleUtil.AreClose(r, max)) hue = (g - b) / delta; else if (DoubleUtil.AreClose(g, max)) hue = 2 + (b - r) / delta; else if (DoubleUtil.AreClose(b, max)) hue = 4 + (r - g) / delta; hue = hue * 60; if (DoubleUtil.LessThan(hue, 0d)) hue += 360; } H = hue / 360d; S = saturation; B = brightness; } public static Color ColorFromAhsb(double a, double h, double s, double b) { var r = ColorFromHsb(h, s, b); r.A = (byte) Math.Round(a * 255d); return r; } public static Color ColorFromHsb(double H, double S, double B) { double red = 0.0, green = 0.0, blue = 0.0; if (DoubleUtil.IsZero(S)) { red = green = blue = B; } else { var h = DoubleUtil.IsOne(H) ? 0d : H * 6.0; var i = (int) Math.Floor(h); var f = h - i; var r = B * (1.0 - S); var s = B * (1.0 - S * f); var t = B * (1.0 - S * (1.0 - f)); switch (i) { case 0: red = B; green = t; blue = r; break; case 1: red = s; green = B; blue = r; break; case 2: red = r; green = B; blue = t; break; case 3: red = r; green = s; blue = B; break; case 4: red = t; green = r; blue = B; break; case 5: red = B; green = r; blue = s; break; } } return Color.FromRgb((byte) Math.Round(red * 255.0), (byte) Math.Round(green * 255.0), (byte) Math.Round(blue * 255.0)); } } }
4)示例 代码如下:
xmlns:wd="https://github.com/WPFDevelopersOrg/WPFDevelopers" <wd:ColorPicker />
效果图
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