방법: 방사형 그라데이션으로 영역 그리기

이 예제에서는 RadialGradientBrush 클래스를 사용하여 방사형 그라데이션으로 영역을 그리는 방법을 보여 줍니다.

예제

다음 예제에서는 RadialGradientBrush를 사용하여 노란색에서 빨간색으로, 파란색에서 라임 그린으로 전환하는 방사형 그라데이션으로 사각형을 그립니다.

using System;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Animation;
using System.Windows.Shapes;

namespace BrushesIntroduction
{
    public class RadialGradientBrushSnippet : Page
    {
        public RadialGradientBrushSnippet()
        {
            Title = "RadialGradientBrush Example";
            Background = Brushes.White;
            Margin = new Thickness(20);

            //
            // Create a RadialGradientBrush with four gradient stops.
            //
            RadialGradientBrush radialGradient = new RadialGradientBrush();

            // Set the GradientOrigin to the center of the area being painted.
            radialGradient.GradientOrigin = new Point(0.5, 0.5);

            // Set the gradient center to the center of the area being painted.
            radialGradient.Center = new Point(0.5, 0.5);

            // Set the radius of the gradient circle so that it extends to
            // the edges of the area being painted.
            radialGradient.RadiusX = 0.5;
            radialGradient.RadiusY = 0.5;

            // Create four gradient stops.
            radialGradient.GradientStops.Add(new GradientStop(Colors.Yellow, 0.0));
            radialGradient.GradientStops.Add(new GradientStop(Colors.Red, 0.25));
            radialGradient.GradientStops.Add(new GradientStop(Colors.Blue, 0.75));
            radialGradient.GradientStops.Add(new GradientStop(Colors.LimeGreen, 1.0));

            // Freeze the brush (make it unmodifiable) for performance benefits.
            radialGradient.Freeze();

            // Create a rectangle and paint it with the
            // RadialGradientBrush.
            Rectangle aRectangle = new Rectangle();
            aRectangle.Width = 200;
            aRectangle.Height = 100;
            aRectangle.Fill = radialGradient;

            StackPanel mainPanel = new StackPanel();
            mainPanel.Children.Add(aRectangle);
            Content = mainPanel;
        }
    }
}

Imports System.Windows
Imports System.Windows.Controls
Imports System.Windows.Input
Imports System.Windows.Media
Imports System.Windows.Media.Animation
Imports System.Windows.Shapes

Namespace BrushesIntroduction
    Public Class RadialGradientBrushSnippet
        Inherits Page
        Public Sub New()
            Title = "RadialGradientBrush Example"
            Background = Brushes.White
            Margin = New Thickness(20)

            '
            ' Create a RadialGradientBrush with four gradient stops.
            '
            Dim radialGradient As New RadialGradientBrush()

            ' Set the GradientOrigin to the center of the area being painted.
            radialGradient.GradientOrigin = New Point(0.5, 0.5)

            ' Set the gradient center to the center of the area being painted.
            radialGradient.Center = New Point(0.5, 0.5)

            ' Set the radius of the gradient circle so that it extends to
            ' the edges of the area being painted.
            radialGradient.RadiusX = 0.5
            radialGradient.RadiusY = 0.5

            ' Create four gradient stops.
            radialGradient.GradientStops.Add(New GradientStop(Colors.Yellow, 0.0))
            radialGradient.GradientStops.Add(New GradientStop(Colors.Red, 0.25))
            radialGradient.GradientStops.Add(New GradientStop(Colors.Blue, 0.75))
            radialGradient.GradientStops.Add(New GradientStop(Colors.LimeGreen, 1.0))

            ' Freeze the brush (make it unmodifiable) for performance benefits.
            radialGradient.Freeze()

            ' Create a rectangle and paint it with the 
            ' RadialGradientBrush.
            Dim aRectangle As New Rectangle()
            aRectangle.Width = 200
            aRectangle.Height = 100
            aRectangle.Fill = radialGradient

            Dim mainPanel As New StackPanel()
            mainPanel.Children.Add(aRectangle)
            Content = mainPanel

        End Sub

    End Class
End Namespace

<Page 
  xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
  xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
  Title="RadialGradientBrush Example"
  Background="White" Margin="20">
  <StackPanel>

    <!-- This rectangle is painted with a radial gradient. -->
    <Rectangle Width="200" Height="100">
      <Rectangle.Fill>
        <RadialGradientBrush 
          GradientOrigin="0.5,0.5" 
          Center="0.5,0.5" RadiusX="0.5" RadiusY="0.5">
          <RadialGradientBrush.GradientStops>
            <GradientStop Color="Yellow" Offset="0" />
            <GradientStop Color="Red" Offset="0.25" />
            <GradientStop Color="Blue" Offset="0.75" />
            <GradientStop Color="LimeGreen" Offset="1" />
          </RadialGradientBrush.GradientStops>
        </RadialGradientBrush>
      </Rectangle.Fill>
    </Rectangle>
  </StackPanel>
</Page>

다음 그림에서는 이전 예제에서 그라데이션을 보여 줍니다. 그라데이션의 중지점은 강조 표시되어 있습니다.

참고

이 항목의 예제는 컨트롤 포인트를 설정하기 위해 기본 좌표계를 사용합니다. 기본 좌표계는 경계 상자를 기준으로 합니다. 즉, 0은 경계 상자의 0%를 나타내고 1은 경계 상자의 100%를 나타냅니다. MappingMode 속성을 Absolute 값으로 설정하여 이 좌표계를 변경할 수 있습니다. 절대 좌표계는 경계 상자를 기준으로 하지 않습니다. 값은 로컬 공간에서 직접 해석됩니다.

추가 RadialGradientBrush 예제는 브러시 샘플을 참조하세요. 그라데이션 및 기타 브러시 유형에 대한 자세한 내용은 단색 및 그라데이션을 사용한 그리기 개요를 참조하세요.