WPF 基础 - 绘画 1) 线段、矩形、圆弧及填充色

1. 绘画

1.1 图形类型

• Line
  X1、Y1、X2、Y2，Stroke，StrokeThickness
• Rectangle 矩形
• Ellipse 椭圆
• Polygon 多边形(自动闭合)
• Polyline 多变形(不自动闭合)
• Path

1.2 线段

<Line X1="10" Y1="20" X2="260" Y2="20" Stroke="Red" StrokeThickness="3"/>

效果：

1.3 矩形及填充色

• SolidColorBrush 单色画刷
• LinearGradientBrush 线性渐画刷
• RadialGradientBrush 径向渐变画刷
• ImageBrush 图片
• DrawingBrush 矢量图和位图做填充
• VisualBrush 控件的
  举例：

<WrapPanel>
    <WrapPanel.Resources>
        <Style TargetType="Rectangle">
            <Setter Property="Width" Value="150"/>
            <Setter Property="Height" Value="150"/>
            <Setter Property="Margin" Value="10"/>
            <Setter Property="Stroke" Value="Black"/>
        </Style>
        <LinearGradientBrush x:Key="DefaultColor">
            <GradientStop Color="#ff4b1f" Offset="0.1"/>
            <GradientStop Color="#1fddff" Offset="1"/>
        </LinearGradientBrush>                
    </WrapPanel.Resources>
    
    <Rectangle Fill="{StaticResource DefaultColor}"/>
    <Rectangle>
        <Rectangle.Fill>
            <LinearGradientBrush>
                <GradientStop Color="#999999" Offset="0"/>
                <GradientStop Color="#555555" Offset="0.5"/>
                <GradientStop Color="#111111" Offset="1"/>
            </LinearGradientBrush>
        </Rectangle.Fill>
    </Rectangle>
    
    <Rectangle>
        <Rectangle.Fill>
            <RadialGradientBrush>
                <GradientStop Color="#999999" Offset="0"/>
                <GradientStop Color="#555555" Offset="0.5"/>
                <GradientStop Color="#111111" Offset="1"/>
            </RadialGradientBrush>
        </Rectangle.Fill>
    </Rectangle>
    
    <Rectangle>
        <Rectangle.Fill>
            <ImageBrush ImageSource="/Resources/Images/Cars/Audi.jpg"/>
        </Rectangle.Fill>
    </Rectangle>

    <!--使用 Drawing 绘制区域，可用形状、文本、视频、图像或其他绘制项填充，这里使用形状-->
    <Rectangle>
        <Rectangle.Fill>
            <DrawingBrush Viewport="0,0,0.2,0.2" TileMode="Tile">
                <DrawingBrush.Drawing>
                    <GeometryDrawing Brush="{StaticResource DefaultColor}">                                
                        <GeometryDrawing.Geometry>
                            <EllipseGeometry RadiusX="10" RadiusY="10"/>
                        </GeometryDrawing.Geometry>
                    </GeometryDrawing>
                </DrawingBrush.Drawing>
            </DrawingBrush>
        </Rectangle.Fill>
    </Rectangle>
    
    <!--使用 Drawing 绘制区域，这里使用图像填充-->
    <Rectangle>
        <Rectangle.Fill>
            <DrawingBrush Viewport="0,0,0.5,0.5" TileMode="Tile">
                <DrawingBrush.Drawing>
                    <ImageDrawing ImageSource="/Resources/Images/Cars/Cayenne.jpg" Rect="0,0 0.5,0.5"/>
                </DrawingBrush.Drawing>
            </DrawingBrush>
        </Rectangle.Fill>
    </Rectangle>
    
    <!--使用 System.Windows.Media.VisualBrush.Visual 绘制区域-->
    <Rectangle>
        <Rectangle.Fill>
            <VisualBrush>
                <VisualBrush.Visual>
                    <Ellipse Fill="{StaticResource DefaultColor}" Opacity="0.6" Stretch="Fill" HorizontalAlignment="Stretch" 
                     VerticalAlignment="Stretch" Width="100" Height="100"></Ellipse>
                </VisualBrush.Visual>
            </VisualBrush>
        </Rectangle.Fill>
    </Rectangle>
</WrapPanel>

效果：

1.4 椭圆

<Ellipse Width="100" Height="100" Stroke="#FFBBDDDD">        
    <Ellipse.Fill>
        <RadialGradientBrush GradientOrigin="0.2, 0.5" RadiusX="0.5" RadiusY="0.5">
            <RadialGradientBrush.RelativeTransform>
                <TransformGroup>
                    <RotateTransform CenterX="0" CenterY="0" Angle="30"/>
                </TransformGroup>
            </RadialGradientBrush.RelativeTransform>
            <GradientStop Color="#FF225555" Offset="0"/>
            <GradientStop Color="#FF336666" Offset="0.2"/>
            <GradientStop Color="#FF558888" Offset="0.4"/>
            <GradientStop Color="#FF88AAAA" Offset="0.6"/>
            <GradientStop Color="#FFAACCCC" Offset="0.8"/>
            <GradientStop Color="#FFCCEEEE" Offset="1"/>
        </RadialGradientBrush>
    </Ellipse.Fill>
</Ellipse>

效果：