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原理#xff1a;
** 以Canvas作为水印显示载体#xff0c;在Canvas中创建若干个TextBlock控件用来显示水印文案#xff0c;如下图所示 然后以每一个TextBlock的左上角为中心旋转-30#xff0c;最终效果会是如图红线所示#xff1a; 为了达到第一行旋转后刚好与窗口…**
原理
** 以Canvas作为水印显示载体在Canvas中创建若干个TextBlock控件用来显示水印文案如下图所示 然后以每一个TextBlock的左上角为中心旋转-30°最终效果会是如图红线所示 为了达到第一行旋转后刚好与窗口上边沿齐平需要计算第一行其实位置的Top坐标由于旋转角度为-30由正余弦可以得出第一行的高度应该是斜边(文字宽度即上图中红线的长度)的一半(sin30°)
接下来确定行间距已经行中间距首先可以确定行间距为150(height)为了达到如下图所示旋转后在同一直线上见下图 即width height * sqrt(3)如果计算结果width小于文字宽度加上文字间隔则以文字宽度加文字间隔重新计算height
之后根据宽高可计算出一共需要多个TextBlock双循环循环创建即可
为了使水印显示在其他控件上面需要在xaml中最后位置创建Canvas且Canvas的IsHitTestVisible必须为false(不响应鼠标事件)、透明度根据需要自行设置(如0.2)
最终显示效果见下图
具体代码如下
xaml
Window x:ClassWpfApplication1.MainWindowxmlnshttp://schemas.microsoft.com/winfx/2006/xaml/presentationxmlns:xhttp://schemas.microsoft.com/winfx/2006/xamlxmlns:dhttp://schemas.microsoft.com/expression/blend/2008xmlns:mchttp://schemas.openxmlformats.org/markup-compatibility/2006xmlns:localclr-namespace:WpfApplication1mc:Ignorabled FontSize18SizeChangedWindow_SizeChangedTitleMainWindow Height400 Width400GridButton Height32 Width100 Contentbtn ClickButton_Click/!-- 一定要放到最后面以确保水印覆盖所有其他控件 --Canvas Namecanvas Opacity0.2 IsHitTestVisibleFalse//Grid
/Window
c#
using System;
using System.Globalization;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Media;namespace WpfApplication1
{/// summary/// Interaction logic for MainWindow.xaml/// /summarypublic partial class MainWindow : Window{string watermark Watermark;public MainWindow(){InitializeComponent();}protected override void OnContentRendered(EventArgs e){base.OnContentRendered(e);InitWatermark();}private void InitWatermark(){canvas.Children.Clear();var formattedText new FormattedText(watermark,CultureInfo.CurrentCulture,FlowDirection.LeftToRight,new Typeface(FontFamily, FontStyle, FontWeight, FontStretch),FontSize,Brushes.Black,new NumberSubstitution(),TextFormattingMode.Display);var height 150.0;var width height * Math.Sqrt(3);if (width formattedText.Width 100){width formattedText.Width 100;height width / Math.Sqrt(3);}var firstRowHeight formattedText.Width / 2;int colCount (int)Math.Ceiling(ActualWidth / width);int rowCount (int)Math.Ceiling((ActualHeight - firstRowHeight) / height);for (int i 0; i rowCount; i){for (int j 0; j colCount; j){TextBlock block new TextBlock();block.Text watermark;Canvas.SetTop(block, firstRowHeight i * height);Canvas.SetLeft(block, j * width);RotateTransform transform new RotateTransform(-30, 0, 0);block.RenderTransform transform;canvas.Children.Add(block);}}}private void Button_Click(object sender, RoutedEventArgs e){if (canvas.IsVisible)canvas.Visibility Visibility.Collapsed;elsecanvas.Visibility Visibility.Visible;}private void Window_SizeChanged(object sender, SizeChangedEventArgs e){InitWatermark();}}
}
