I would like to recreate a conical/circular gradient in WPF. I've looked into inheriting System.Windows.Media.GradientBrush - which can be inherited from - but uses a lot of internal plumbing to get the job done (inherited from System.Windows.Media.Brush)
我想在WPF中重新创建一个圆锥/圆形渐变。我已经研究过继承System.Windows.Media.GradientBrush - 它可以继承 - 但是使用了很多内部管道来完成工作（继承自System.Windows.Media.Brush）
Any ideas on how to achieve this would be appreciated (preferrably without resorting to bitmaps)
任何有关如何实现这一点的想法都将受到赞赏（最好不要使用位图）
Cheers.
干杯。
Dan
担
This question was asked some time back in July (Circular Gradient and WPF) but I didn't want to resurrect an old question.
这个问题在七月（循环渐变和WPF）问了一段时间，但我不想复活一个旧问题。
1 个解决方案
#1
5
You could create a custom Effect. I would recommend downloading Shazzam you will also need the DirectX SDK. Give the element a horizontal gradient then apply the effect to transform it into a cone gradient.
您可以创建自定义效果。我建议下载Shazzam，你还需要DirectX SDK。为元素提供水平渐变，然后应用效果将其转换为锥形渐变。
/// <class>AngleGradient</class>
/// <description>Renders an angle gradient.</description>
//-----------------------------------------------------------------------------------------
// Shader constant register mappings (scalars - float, double, Point, Color, Point3D, etc.)
//-----------------------------------------------------------------------------------------
/// <summary>The centre of the gradient.</summary>
/// <minValue>0</minValue>
/// <maxValue>1</maxValue>
/// <defaultValue>0.5,0.5</defaultValue>
float2 Centre : register(C0);
/// <summary>The start angle.</summary>
/// <minValue>0</minValue>
/// <maxValue>1</maxValue>
/// <defaultValue>0</defaultValue>
float Angle : register(C1);
//--------------------------------------------------------------------------------------
// Sampler Inputs (Brushes, including ImplicitInput)
//--------------------------------------------------------------------------------------
sampler1D implicitInputSampler : register(S0);
static const float PI = 3.14159265f;
//--------------------------------------------------------------------------------------
// Pixel Shader
//--------------------------------------------------------------------------------------
float4 main(float2 uv : TEXCOORD) : COLOR
{
float angle = atan2(uv.y-Centre.y, uv.x-Centre.x)+PI;
angle = (angle/(2*PI)) + Angle;
return tex1D(implicitInputSampler,min(angle > 1 ? angle-1 : angle,0.99));
#1
5
You could create a custom Effect. I would recommend downloading Shazzam you will also need the DirectX SDK. Give the element a horizontal gradient then apply the effect to transform it into a cone gradient.
您可以创建自定义效果。我建议下载Shazzam，你还需要DirectX SDK。为元素提供水平渐变，然后应用效果将其转换为锥形渐变。
/// <class>AngleGradient</class>
/// <description>Renders an angle gradient.</description>
//-----------------------------------------------------------------------------------------
// Shader constant register mappings (scalars - float, double, Point, Color, Point3D, etc.)
//-----------------------------------------------------------------------------------------
/// <summary>The centre of the gradient.</summary>
/// <minValue>0</minValue>
/// <maxValue>1</maxValue>
/// <defaultValue>0.5,0.5</defaultValue>
float2 Centre : register(C0);
/// <summary>The start angle.</summary>
/// <minValue>0</minValue>
/// <maxValue>1</maxValue>
/// <defaultValue>0</defaultValue>
float Angle : register(C1);
//--------------------------------------------------------------------------------------
// Sampler Inputs (Brushes, including ImplicitInput)
//--------------------------------------------------------------------------------------
sampler1D implicitInputSampler : register(S0);
static const float PI = 3.14159265f;
//--------------------------------------------------------------------------------------
// Pixel Shader
//--------------------------------------------------------------------------------------
float4 main(float2 uv : TEXCOORD) : COLOR
{
float angle = atan2(uv.y-Centre.y, uv.x-Centre.x)+PI;
angle = (angle/(2*PI)) + Angle;
return tex1D(implicitInputSampler,min(angle > 1 ? angle-1 : angle,0.99));