WPF内发光效果(WPF Inner Glow Effect)

2019-09-16 18:00发布

有谁知道如何在WPF内发光效果,而无需使用Expression Blend的或过时BitmapEffects?

样图:

举例来说,这里是一些XAML与图像和一些文本的按钮。 我想这个按钮有一个内发光(不是外发光):

<Button Click="HandleDeleteRows" Style="{StaticResource ButtonCellStyle}">
    <DockPanel>
        <Image Style="{StaticResource DeleteButtonImage}" />
        <TextBlock Style="{StaticResource DeleteButtonCaption}" />
    </DockPanel>
</Button>

Answer 1:

虽然我简单的例子以上由PompolutZ的回答解决了,我在一个位置,覆盖控制的控制模板是不是我想要的风格应用到我的现实世界的例子 - 所以我走上定义自己的影响,下面的说明在这里 。

第1步 -写一个HLSL .FX文件,将做你想要的效果。 我放弃了辉光为太复杂,因为它需要的边缘检测。 我决定去与标准颜色,亮度,伽马和饱和度的调整摆那是相当容易实现,而且会让我创造了一些不错的视觉线索。 他们是很容易实现使用常识,并在网上查找像素着色算法。

ColourAdjust.fx

sampler2D implicitInput : register(s0);
float saturation : register(c0);
float gamma : register(c1);
float brightness : register(c2);
float red_adjust : register(c3);
float green_adjust : register(c4);
float blue_adjust : register(c5);

static const float max_gamma = 100;

float4 main(float2 uv : TEXCOORD) : COLOR
{
    float4 color = tex2D(implicitInput, uv);
    float4 result;

    // Apply greyscale desaturation
    float gray = color.r * 0.3 + color.g * 0.59 + color.b *0.11; 
    result.r = (color.r - gray) * saturation + gray;
    result.g = (color.g - gray) * saturation + gray;
    result.b = (color.b - gray) * saturation + gray;

    // Apply Gamma Adjustment (if it's not approximately 0.5 - which means no adjustment)
    float gammafactor = gamma == 0 ? max_gamma : log(gamma) / log(0.5);
    result.r = pow(result.r, gammafactor);
    result.g = pow(result.g, gammafactor);
    result.b = pow(result.b, gammafactor);

    //Apply linear brightness adjustment
    result.r += brightness + red_adjust;
    result.g += brightness + green_adjust;
    result.b += brightness + blue_adjust;

    //Clamp brightness adjustment result to bounds 0 <= val <= 1
    result.r = (result.r > 1 ? 1 : (result.r < 0 ? 0 : result.r));
    result.g = (result.g > 1 ? 1 : (result.g < 0 ? 0 : result.g));
    result.b = (result.b > 1 ? 1 : (result.b < 0 ? 0 : result.b));

    result.a = color.a;
    return result;
}

第2步 -我不得不下载的本地副本的DirectX SDK ,这样我可以编译上面的HLSL代码转换成PS文件,该文件是什么使用WPF -给我ColourAdjust.ps

> > fxc.exe /T ps_2_0 /E PS /ColourAdjust.ps ColourAdjust.fx

第3步 -写ShaderEffect类,将通过DependencyProperties暴露的效果参数。 这里是ColourAdjustEffect.cs

using System;
using System.Reflection;
using System.Windows;
using System.Windows.Media;
using System.Windows.Media.Effects;

namespace WPF.Utilities.UI
{
    public class ColourAdjustEffect : ShaderEffect
    {
        private static PixelShader _pixelShader = new PixelShader() { UriSource = new Uri("pack://application:,,,/" + Assembly.GetExecutingAssembly() + ";component/Effects/ColourAdjust.ps") };
        public static readonly DependencyProperty InputProperty = ShaderEffect.RegisterPixelShaderSamplerProperty("Input", typeof(ColourAdjustEffect), 0);
        public static readonly DependencyProperty SaturationProperty = DependencyProperty.Register("Saturation", typeof(double), typeof(ColourAdjustEffect), new UIPropertyMetadata(1.0, PixelShaderConstantCallback(0), CoerceFactor));
        public static readonly DependencyProperty GammaProperty = DependencyProperty.Register("Gamma", typeof(double), typeof(ColourAdjustEffect), new UIPropertyMetadata(0.5, PixelShaderConstantCallback(1), CoerceFactor));
        public static readonly DependencyProperty BrightnessAdjustmentProperty = DependencyProperty.Register("BrightnessAdjustment", typeof(double), typeof(ColourAdjustEffect), new UIPropertyMetadata(0.0, PixelShaderConstantCallback(2), CoerceBrightnessAdjustment));
        public static readonly DependencyProperty RedAdjustmentProperty = DependencyProperty.Register("RedAdjustment", typeof(double), typeof(ColourAdjustEffect), new UIPropertyMetadata(0.0, PixelShaderConstantCallback(3), CoerceBrightnessAdjustment));
        public static readonly DependencyProperty GreenAdjustmentProperty = DependencyProperty.Register("GreenAdjustment", typeof(double), typeof(ColourAdjustEffect), new UIPropertyMetadata(0.0, PixelShaderConstantCallback(4), CoerceBrightnessAdjustment));
        public static readonly DependencyProperty BlueAdjustmentProperty = DependencyProperty.Register("BlueAdjustment", typeof(double), typeof(ColourAdjustEffect), new UIPropertyMetadata(0.0, PixelShaderConstantCallback(5), CoerceBrightnessAdjustment));

        public ColourAdjustEffect()
        {
            PixelShader = _pixelShader;

            UpdateShaderValue(InputProperty);
            UpdateShaderValue(SaturationProperty);
            UpdateShaderValue(GammaProperty);
            UpdateShaderValue(BrightnessAdjustmentProperty);
            UpdateShaderValue(RedAdjustmentProperty);
            UpdateShaderValue(GreenAdjustmentProperty);
            UpdateShaderValue(BlueAdjustmentProperty);
        }

        public Brush Input
        {
            get { return (Brush)GetValue(InputProperty); }
            set { SetValue(InputProperty, value); }
        }

        /// <summary>A value between 0 and 1 to alter the amount of colour left in the image. 0 is entirely greyscale, and 1 is unaffected. Default is 1.</summary>
        public double Saturation
        {
            get { return (double)GetValue(SaturationProperty); }
            set { SetValue(SaturationProperty, value); }
        }

        /// <summary>A value between 0 and 1 to alter the lightness of the greyscale without altering true black or true white. 
        /// 0 shifts shades closer to true black, and 1 shifts shades closer to true white. Default is 0.5.</summary>
        public double Gamma
        {
            get { return (double)GetValue(GammaProperty); }
            set { SetValue(GammaProperty, value); }
        }

        /// <summary>A value between -1 and 1 to linearly move the end result closer to true black or true white respectively.
        /// -1 will result in an entirely black image, +1 will result in an entirely white image. Default is 0.</summary>
        public double BrightnessAdjustment
        {
            get { return (double)GetValue(BrightnessAdjustmentProperty); }
            set { SetValue(BrightnessAdjustmentProperty, value); }
        }

        /// <summary>A value between -1 and 1 to linearly increase the Red component of the result.
        /// -1 will remove all Red from the image, +1 will maximize all Red in the image. Default is 0.</summary>
        public double RedAdjustment
        {
            get { return (double)GetValue(RedAdjustmentProperty); }
            set { SetValue(RedAdjustmentProperty, value); }
        }
        /// <summary>A value between -1 and 1 to linearly increase the Green component of the result.
        /// -1 will remove all Green from the image, +1 will maximize all Green in the image. Default is 0.</summary>
        public double GreenAdjustment
        {
            get { return (double)GetValue(GreenAdjustmentProperty); }
            set { SetValue(GreenAdjustmentProperty, value); }
        }
        /// <summary>A value between -1 and 1 to linearly increase the Blue component of the result.
        /// -1 will remove all Blue from the image, +1 will maximize all Blue in the image. Default is 0.</summary>
        public double BlueAdjustment
        {
            get { return (double)GetValue(BlueAdjustmentProperty); }
            set { SetValue(BlueAdjustmentProperty, value); }
        }

        private static object CoerceFactor(DependencyObject d, object value)
        {
            double newFactor = (double)value;

            if( newFactor < 0.0 ) return 0.0;
            if( newFactor > 1.0 ) return 1.0;
            return newFactor;
        }

        private static object CoerceBrightnessAdjustment(DependencyObject d, object value)
        {
            double newFactor = (double)value;

            if( newFactor < -1.0 ) return -1.0;
            if( newFactor > 1.0 ) return 1.0;
            return newFactor;
        }
    }
}

步骤4:在XAML中使用的效果:

<Setter Property="Effect">
    <Setter.Value>
        <ui:ColourAdjustEffect Saturation="0" Gamma="0.6" 
                               BrightnessAdjustment="-0.2" RedAdjustment="0.04" />
    </Setter.Value>
</Setter>

因此,虽然我没有得到我的光晕效果,我有足够的参数与玩我能得到一个“突出”的视觉线索,这是我真正的目标。 这里的一些事情,我能够用它来做:



Answer 2:

也许你可以尝试这样的事情(注意,这是没有完成的解决方案只是一个想法!):

<Style x:Key="{x:Type Button}" TargetType="{x:Type Button}">
    <Style.Setters>
        <Setter Property="Template">
            <Setter.Value>
                <ControlTemplate TargetType="{x:Type Button}">
                    <Grid>
                        <Border CornerRadius="10" BorderThickness="20">
                            <Border.BorderBrush>
                                <LinearGradientBrush StartPoint="0, 0.5" EndPoint="1, 0.5">
                                    <GradientStop Color="LightGreen" Offset="0.0" />
                                    <GradientStop Color="Transparent" Offset="0.15" />
                                </LinearGradientBrush>
                            </Border.BorderBrush>
                        </Border>
                        <Border CornerRadius="10" BorderThickness="20">
                            <Border.BorderBrush>
                                <LinearGradientBrush StartPoint="0, 0.5" EndPoint="1, 0.5">
                                    <GradientStop Color="LightGreen" Offset="1.0" />
                                    <GradientStop Color="Transparent" Offset="0.85" />
                                </LinearGradientBrush>
                            </Border.BorderBrush>
                        </Border>
                        <Border CornerRadius="10" BorderThickness="20">
                            <Border.BorderBrush>
                                <LinearGradientBrush StartPoint="0.5, 0" EndPoint="0.5, 1">
                                    <GradientStop Color="LightGreen" Offset="0.0" />
                                    <GradientStop Color="Transparent" Offset="0.15" />
                                </LinearGradientBrush>
                            </Border.BorderBrush>
                        </Border>
                        <Border CornerRadius="10" BorderThickness="20">
                            <Border.BorderBrush>
                                <LinearGradientBrush StartPoint="0.5 0" EndPoint="0.5, 1">
                                    <GradientStop Color="LightGreen" Offset="1.0" />
                                    <GradientStop Color="Transparent" Offset="0.85" />
                                </LinearGradientBrush>
                            </Border.BorderBrush>
                        </Border>
                        <Border BorderBrush="White" BorderThickness="2" CornerRadius="5" Margin="18"></Border>
                        <ContentPresenter HorizontalAlignment="Center"
                                            VerticalAlignment="Center"/>
                    </Grid>
                </ControlTemplate>
            </Setter.Value>
        </Setter>
    </Style.Setters>
</Style>

我们可以通过与各地的电网部分内容边框打使“光晕”效果。 我觉得它不会那么灵活的课程为InnerGlow BitmapEffect的,但无论如何它已经过时了。



文章来源: WPF Inner Glow Effect
标签: wpf .net-4.0