WPF内发光效果

时间:2012-04-25 14:11:40

标签: wpf .net-4.0

有没有人知道如何使用表达式混合或弃用的BitmapEffects在WPF 中使用制作内部辉光效果?

示例图片:

enter image description here

例如,这里有一些带有图像和一些文本的按钮的xaml。我希望这个按钮有一个内部发光(不是外部发光):

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

2 个答案:

答案 0 :(得分:2)

虽然上面的简化示例是通过PompolutZ的答案解决的,但我无法覆盖控件的控件模板,我希望在我的真实世界示例中应用该样式 - 所以我开始定义自己的效果,按照说明here

第1步 - 编写可以达到预期效果的HLSL .FX文件。我放弃了发光太复杂,因为它需要边缘检测。我决定采用一系列标准的颜色,亮度,伽马和饱和度调整,这些调整相当容易实现,并且可以让我创建一些很好的视觉提示。使用常识并在线查找像素着色算法非常容易实现它们。

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 - 我必须下载DirectX SDK的本地副本,以便我可以将上面的HLSL代码编译成PS文件,这是WPF使用的 - 给我ColourAdjust.ps

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

第3步 - 编写一个ShaderEffect类,它将通过DependencyProperties公开效果参数。这是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;
        }
    }
}

第4步:在xaml中使用效果:

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

所以虽然我没有得到我的发光效果,但是我有足够的参数可以让我得到一个'突出'的视觉提示,这是我真正的目标。以下是我能用它做的一些事情:

enter image description here

答案 1 :(得分:1)

也许你可以尝试这样的事情(注意!这不是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>

我们可以通过在Grid中使用某些内容的边框来制作“发光”效果。我觉得它当然不会像InnerGlow BitmapEffect那样灵活,但无论如何它已经过时了。