绘图: Stroke, Brush

Stroke - 笔划

• Brush - 画笔

示例
1、演示“Stroke”相关知识点
Drawing/Stroke.xaml

<Page
    x:Class="Windows10.Drawing.Stroke"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:local="using:Windows10.Drawing"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    mc:Ignorable="d">

    <Grid Background="Transparent">
        <StackPanel Margin="10 0 10 10">

            <!--
                Stroke - 笔划（注：Stroke 属性是 Brush 类型）
            -->

            <!--
                StrokeDashArray - 虚线实体和虚线间隙的值的集合
                    以本例为例：第1条实线长度2，第1条虚线长度4，第2条实线长度6，第2条虚线长度2，第3条实线长度4，第3条虚线长度6
                    长度为 StrokeDashArray 乘以 StrokeThickness/2
            -->
            <Line X1="0" Y1="0" X2="1000" Y2="0" Stroke="Orange" StrokeThickness="20" StrokeDashArray="2 4 6" />

            <!--
                StrokeDashCap - 虚线两端（线帽）的类型（System.Windows.Media.PenLineCap 枚举）
                    PenLineCap.Flat - 无。默认值
                    PenLineCap.Round - 直径等于 StrokeThickness
                    PenLineCap.Square - 高度等于 StrokeThickness 并且 宽度等于 StrokeThickness/2
                    PenLineCap.Triangle - 底边长等于 StrokeThickness 的等腰直角三角形
            -->
            <Line X1="0" Y1="0" X2="1000" Y2="0" Margin="0 30 0 0" Stroke="Orange" StrokeThickness="20" StrokeDashArray="2" StrokeDashCap="Flat" />
            <Line X1="0" Y1="0" X2="1000" Y2="0" Margin="0 30 0 0" Stroke="Orange" StrokeThickness="20" StrokeDashArray="2" StrokeDashCap="Round" />
            <Line X1="0" Y1="0" X2="1000" Y2="0" Margin="0 30 0 0" Stroke="Orange" StrokeThickness="20" StrokeDashArray="2" StrokeDashCap="Square" />
            <Line X1="0" Y1="0" X2="1000" Y2="0" Margin="0 30 0 0" Stroke="Orange" StrokeThickness="20" StrokeDashArray="2" StrokeDashCap="Triangle" />

            <!--
                StrokeStartLineCap - 虚线起始端（线帽）的类型（System.Windows.Media.PenLineCap 枚举）
                StrokeEndLineCap - 虚线终结端（线帽）的类型（System.Windows.Media.PenLineCap 枚举）
            -->
            <Line X1="0" Y1="0" X2="1000" Y2="0" Margin="0 30 0 0" Stroke="Orange" StrokeThickness="20" StrokeDashArray="2" StrokeStartLineCap="Triangle" StrokeEndLineCap="Round" />

            <!--
                StrokeDashOffset - 虚线的起始点的偏移位置
                    以下举例：画一条以虚线间隙为起始的虚线
            -->
            <Line X1="0" Y1="0" X2="1000" Y2="0" Margin="0 30 0 0" Stroke="Orange" StrokeThickness="20" StrokeDashArray="2" StrokeDashOffset="10" />

            <!--
                StrokeLineJoin - 图形连接点处的连接类型（System.Windows.Media.PenLineJoin 枚举）
                    StrokeLineJoin.Bevel - 线形连接
                    StrokeLineJoin.Miter - 角形连接。默认值
                    StrokeLineJoin.Round - 弧形连接
            -->
            <StackPanel Margin="0 30 0 0" Orientation="Horizontal">
                <Polyline Points="10,100 50,10 100,100" Stroke="Orange" StrokeThickness="20" HorizontalAlignment="Center" StrokeLineJoin="Bevel" />
                <Polyline Points="10,100 50,10 100,100" Stroke="Orange" StrokeThickness="20" HorizontalAlignment="Center" StrokeLineJoin="Miter" />
                <Polyline Points="10,100 50,10 100,100" Stroke="Orange" StrokeThickness="20" HorizontalAlignment="Center" StrokeLineJoin="Round" />
            </StackPanel>

            <!--
                StrokeMiterLimit - 斜接长度（蓝色线部分）与 StrokeThickness/2 的比值。默认值 10，最小值 1
            -->
            <Grid Margin="0 30 0 0" HorizontalAlignment="Left">
                <Grid.ColumnDefinitions>
                    <ColumnDefinition Width="120" />
                    <ColumnDefinition Width="120" />
                    <ColumnDefinition Width="120" />
                </Grid.ColumnDefinitions>

                <Polyline Grid.Column="0" Points="0,100 50,10 100,100" Stroke="Orange" StrokeThickness="20" StrokeMiterLimit="1" />
                <Line Grid.Column="0" X1="50" Y1="10" X2="50" Y2="0" Stroke="Blue" />
                <Polyline Grid.Column="0" Points="0,100 50,10 100,100" Stroke="Red" />

                <Polyline Grid.Column="1" Points="0,100 50,10 100,100" Stroke="Orange" StrokeThickness="20" StrokeMiterLimit="2.0" />
                <Line Grid.Column="1" X1="50" Y1="10" X2="50" Y2="-10" Stroke="Blue" />
                <Polyline Grid.Column="1" Points="0,100 50,10 100,100" Stroke="Red" />
            </Grid>

        </StackPanel>
    </Grid>
</Page>

2、演示“Brush”相关知识点
Drawing/Brush.xaml

<Page
    x:Class="Windows10.Drawing.Brush"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:local="using:Windows10.Drawing"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    mc:Ignorable="d">

    <Grid Background="Transparent">
        <StackPanel Margin="10 0 10 10" HorizontalAlignment="Left">

            <!--
                Windows.UI.Xaml.Media.Brush - 画笔
            -->

            <!--
                SolidColorBrush - 单色画笔
                    Color - 颜色
                        格式如下：
                        预定义的Color的名称。如：Red, Green, Blue
                        #RGB。如：#F00
                        #ARGB（A为Alpha值）。如：#FF00, #F0F0, #F00F
                        #RGB。如：#FF0000, #00FF00, #0000FF
                        #ARGB（A为Alpha值）。如：#FFFF0000, #FF00FF00, #FF0000FF
            -->
            <Ellipse Margin="10" Width="200" Height="100" Stroke="Yellow" StrokeThickness="3" HorizontalAlignment="Left">
                <Ellipse.Fill>
                    <SolidColorBrush Color="#88FF0000" />
                </Ellipse.Fill>
            </Ellipse>

            <!--
                ImageBrush - 图像画笔
                    ImageSource - 图片地址
                    Stretch - 拉伸方式
                    AlignmentX - 水平方向的对齐方式。Center（默认值）, Left, Right
                    AlignmentY - 垂直方向的对齐方式。Center（默认值）, Top, Bottom
            -->
            <Rectangle Width="100" Height="100" Stroke="Red" StrokeThickness="1" HorizontalAlignment="Left" Margin="0 10 0 0">
                <Rectangle.Fill>
                    <ImageBrush ImageSource="/Assets/Logo.png" AlignmentX="Right" AlignmentY="Bottom" Stretch="Fill" />
                </Rectangle.Fill>
            </Rectangle>

            <WebView x:Name="webView" Source="http://webabcd.cnblogs.com" Width="300" Height="100" LoadCompleted="webView_LoadCompleted" HorizontalAlignment="Left" Margin="0 10 0 0" />
            <!--
                WebView - 浏览器画笔
                    SourceName - WebView 指向的 http 地址

                注：如果需要显示 WebView 的最新结果，需要调用 WebViewBrush.Redraw() 方法
            -->
            <Rectangle Width="300" Height="100" Stroke="Red" HorizontalAlignment="Left" Margin="0 10 0 0">
                <Rectangle.Fill>
                    <WebViewBrush x:Name="webViewBrush"  SourceName="webView"/>
                </Rectangle.Fill>
            </Rectangle>

            <!--
                演示 LinearGradientBrush 如何使用（注：不支持 RadialGradientBrush）
            -->
            <StackPanel Orientation="Horizontal"  HorizontalAlignment="Left" Margin="0 10 0 0">
                <Grid>
                    <Rectangle Width="200" Height="100" HorizontalAlignment="Left">
                        <Rectangle.Fill>
                            <!--
                                LinearGradientBrush - 线性渐变画笔
                                    StartPoint - 线性渐变的起点。默认渐变方向为对角线方向，默认值为左上角0,0
                                    EndPoint - 线性渐变的终点。默认渐变方向为对角线方向，默认值为右下角1,1
                                    GradientStop - 渐变中，过渡点的设置
                                        Color - 过渡点的颜色
                                        Offset - 过渡点的位置。相对于渐变线的比值。最小值0.0（默认值），最大值1.0
                                    ColorInterpolationMode - 插入渐变颜色的方式（System.Windows.Media.ColorInterpolationMode 枚举）
                                        ScRgbLinearInterpolation - scRGB
                                        SRgbLinearInterpolation - sRGB。默认值
                            -->
                            <LinearGradientBrush StartPoint="0,0" EndPoint="1,1" ColorInterpolationMode="SRgbLinearInterpolation">
                                <GradientStop Color="Red" Offset="0.0" />
                                <GradientStop Color="Green" Offset="0.25" />
                                <GradientStop Color="Blue" Offset="0.75" />
                                <GradientStop Color="Yellow" Offset="1.0" />
                            </LinearGradientBrush>
                        </Rectangle.Fill>
                    </Rectangle>
                    <Line X1="0" Y1="0" X2="200" Y2="100" Stroke="Black" HorizontalAlignment="Left" />
                </Grid>

                <Grid Margin="10 0 0 0">
                    <Rectangle Width="200" Height="100" HorizontalAlignment="Left">
                        <Rectangle.Fill>
                            <!--
                                MappingMode - 指定线性渐变的起点（StartPoint）和终点（EndPoint）相对于输出区域是相对的还是绝对的（System.Windows.Media.BrushMappingMode 枚举）
                                    MappingMode.RelativeToBoundingBox - 相对坐标。默认值
                                    MappingMode.Absolute - 绝对坐标
                            -->
                            <LinearGradientBrush StartPoint="0,0" EndPoint="200,100" MappingMode="Absolute">
                                <GradientStop Color="Red" Offset="0.0" />
                                <GradientStop Color="Green" Offset="0.25" />
                                <GradientStop Color="Blue" Offset="0.75" />
                                <GradientStop Color="Yellow" Offset="1.0" />
                            </LinearGradientBrush>
                        </Rectangle.Fill>
                    </Rectangle>
                    <Line X1="0" Y1="0" X2="200" Y2="100" Stroke="Black" HorizontalAlignment="Left" />
                </Grid>

                <Grid Margin="10 0 0 0">
                    <Rectangle Width="200" Height="100" HorizontalAlignment="Left">
                        <Rectangle.Fill>
                            <!--
                                SpreadMethod - 线性渐变线（黑色线）之外， 输出区域之内的渐变方式（System.Windows.Media.GradientSpreadMethod枚举）
                                    GradientSpreadMethod.Pad - 用线性渐变线末端的颜色值填充剩余空间。默认值
                            -->
                            <LinearGradientBrush StartPoint="0.4,0.5" EndPoint="0.6,0.5" SpreadMethod="Pad">
                                <GradientStop Color="Red" Offset="0.0" />
                                <GradientStop Color="Green" Offset="1.0" />
                            </LinearGradientBrush>
                        </Rectangle.Fill>
                    </Rectangle>
                    <Line X1="80" Y1="50" X2="120" Y2="50" Stroke="Black" HorizontalAlignment="Left" />
                </Grid>

                <Grid Margin="10 0 0 0">
                    <Rectangle Width="200" Height="100" HorizontalAlignment="Left">
                        <Rectangle.Fill>
                            <!--
                                SpreadMethod - 线性渐变线（黑色线）之外， 输出区域之内的渐变方式（System.Windows.Media.GradientSpreadMethod枚举）
                                    GradientSpreadMethod.Reflect - 相邻填充区域，以 相反方向 重复渐变，直至填充满整个剩余空间
                            -->
                            <LinearGradientBrush StartPoint="0.4,0.5" EndPoint="0.6,0.5" SpreadMethod="Reflect">
                                <GradientStop Color="Red" Offset="0.0" />
                                <GradientStop Color="Green" Offset="1.0" />
                            </LinearGradientBrush>
                        </Rectangle.Fill>
                    </Rectangle>
                    <Line X1="80" Y1="50" X2="120" Y2="50" Stroke="Black" HorizontalAlignment="Left" />
                </Grid>

                <Grid Margin="10 0 0 0">
                    <Rectangle Width="200" Height="100" HorizontalAlignment="Left">
                        <Rectangle.Fill>
                            <!--
                                SpreadMethod - 线性渐变线（黑色线）之外， 输出区域之内的渐变方式（System.Windows.Media.GradientSpreadMethod枚举）
                                    GradientSpreadMethod.Repeat - 相邻填充区域，以 相同方向 重复渐变，直至填充满整个剩余空间
                            -->
                            <LinearGradientBrush StartPoint="0.4,0.5" EndPoint="0.6,0.5" SpreadMethod="Repeat">
                                <GradientStop Color="Red" Offset="0.0" />
                                <GradientStop Color="Green" Offset="1.0" />
                            </LinearGradientBrush>
                        </Rectangle.Fill>
                    </Rectangle>
                    <Line X1="80" Y1="50" X2="120" Y2="50" Stroke="Black" HorizontalAlignment="Left" />
                </Grid>
            </StackPanel>

        </StackPanel>
    </Grid>
</Page>

Drawing/Brush.xaml.cs

using Windows.UI.Xaml.Controls;
using Windows.UI.Xaml.Navigation;

namespace Windows10.Drawing
{
    public sealed partial class Brush : Page
    {
        public Brush()
        {
            this.InitializeComponent();
        }

        private void webView_LoadCompleted(object sender, NavigationEventArgs e)
        {
            // WebView 加载完毕后重绘 WebViewBrush
            webViewBrush.Redraw();
        }
    }
}