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背水一战 Windows 10 (62) - 控件(媒体类): InkCanvas 保存和加载, 手写识别
作者:webabcd
介绍
背水一战 Windows 10 之 控件(媒体类)
- InkCanvas 保存和加载
- InkCanvas 手写识别
示例
1、演示 InkCanvas 涂鸦板的保存和加载
Controls/MediaControl/InkCanvasDemo3.xaml
<Page
x:Class="Windows10.Controls.MediaControl.InkCanvasDemo3"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:local="using:Windows10.Controls.MediaControl"
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">
<Border Background="White" Width="480" Height="320" Margin="5" HorizontalAlignment="Left">
<!--
InkCanvas - 涂鸦板控件
-->
<InkCanvas Name="inkCanvas" />
</Border>
<Button Name="save" Content="保存到文件" Margin="5" Click="save_Click" />
<Button Name="load" Content="从文件读取" Margin="5" Click="load_Click" />
</StackPanel>
</Grid>
</Page>
Controls/MediaControl/InkCanvasDemo3.xaml.cs
/*
* InkCanvas - 涂鸦板控件(继承自 FrameworkElement, 请参见 /Controls/BaseControl/FrameworkElementDemo/)
* InkPresenter - 获取 InkPresenter 对象
*
* InkPresenter - 涂鸦板
* StrokeContainer - 返回 InkStrokeContainer 类型的对象
*
* InkStrokeContainer - 用于管理涂鸦
* IAsyncOperationWithProgress<UInt32, UInt32> SaveAsync(IOutputStream outputStream) - 保存涂鸦数据
* IAsyncActionWithProgress<UInt64> LoadAsync(IInputStream inputStream) - 加载涂鸦数据
*/
using System;
using System.Collections.Generic;
using Windows.Foundation;
using Windows.Storage;
using Windows.Storage.Pickers;
using Windows.Storage.Streams;
using Windows.UI;
using Windows.UI.Core;
using Windows.UI.Input.Inking;
using Windows.UI.Xaml;
using Windows.UI.Xaml.Controls;
namespace Windows10.Controls.MediaControl
{
public sealed partial class InkCanvasDemo3 : Page
{
public InkCanvasDemo3()
{
this.InitializeComponent();
inkCanvas.InkPresenter.InputDeviceTypes = CoreInputDeviceTypes.Mouse | CoreInputDeviceTypes.Pen | CoreInputDeviceTypes.Touch;
InkDrawingAttributes drawingAttributes = inkCanvas.InkPresenter.CopyDefaultDrawingAttributes();
drawingAttributes.IgnorePressure = true;
drawingAttributes.Color = Colors.Red;
drawingAttributes.Size = new Size(4, 4);
inkCanvas.InkPresenter.UpdateDefaultDrawingAttributes(drawingAttributes);
}
private async void save_Click(object sender, RoutedEventArgs e)
{
if (inkCanvas.InkPresenter.StrokeContainer.GetStrokes().Count == 0)
return;
// 用于保存涂鸦数据
IRandomAccessStream stream = new InMemoryRandomAccessStream();
await inkCanvas.InkPresenter.StrokeContainer.SaveAsync(stream);
// 文件保存对话框
var picker = new FileSavePicker
{
SuggestedStartLocation = PickerLocationId.DocumentsLibrary
};
picker.FileTypeChoices.Add("ink files