MainPage.xaml

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

    <Grid Background="White">
        <Grid.RowDefinitions>
            <RowDefinition Height="Auto" />
            <RowDefinition Height="*"/>
        </Grid.RowDefinitions>

        <InkCanvas x:Name="ink" Height="2000" Width="3000" Grid.Row="1">
            <InkCanvas.RenderTransform>
                <CompositeTransform x:Name="inkTransform" />
            </InkCanvas.RenderTransform>
        </InkCanvas>
        
        <StackPanel Orientation="Horizontal" Grid.Row="0">
            <Button x:Name="btnLoad"  Content="Load" Margin="10" Click="BtnLoad_Click" />
            <Button x:Name="btnSave"  Content="Save" Margin="10" Click="BtnSave_Click" />
            <Button x:Name="btnClear" Content="Clear Canvas" Margin="10" Click="BtnClear_Click" />
            <Button x:Name="btnReset" Content="Reset Zoom" Margin="10" Click="btnReset_Click" />
        </StackPanel>

        <InkToolbar 
            Grid.Row="0" 
            TargetInkCanvas="{Binding ElementName=ink}" 
            HorizontalAlignment="Center" 
            VerticalAlignment="Top" />
    </Grid>

</Page>

MainPage.xaml.cs

using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Threading.Tasks;
using Windows.Foundation;
using Windows.Networking.Sockets;
using Windows.Storage.Streams;
using Windows.UI.Input;
using Windows.UI.Input.Inking;
using Windows.UI.Xaml;
using Windows.UI.Xaml.Controls;
using Windows.UI.Xaml.Input;

namespace BlackBoard {
    public sealed partial class MainPage : Page {
        public MainPage() {
            InitializeComponent();
            Loaded += OnLoaded;
        }

        void OnLoaded(object sender, RoutedEventArgs e) {
            ink.ManipulationMode =
                ManipulationModes.Rotate | 
                ManipulationModes.Scale | 
                ManipulationModes.TranslateX | 
                ManipulationModes.TranslateY;

            ink.ManipulationDelta += Ink_ManipulationDelta;
        }

        private void Ink_ManipulationDelta(object sender, ManipulationDeltaRoutedEventArgs e) {
            inkTransform.Rotation   +=  e.Delta.Rotation;
            inkTransform.CenterX     =  e.Position.X;
            inkTransform.CenterY     =  e.Position.Y;
            inkTransform.ScaleX     *=  e.Delta.Scale;
            inkTransform.ScaleY     *=  e.Delta.Scale;
            inkTransform.TranslateX +=  e.Delta.Translation.X;
            inkTransform.TranslateY +=  e.Delta.Translation.Y;
        }


        private async void BtnSave_Click(object sender, RoutedEventArgs e) {
            // snip
        }


        private async void BtnLoad_Click(object sender, RoutedEventArgs e) {
            // snip
        }


        private void BtnClear_Click(object sender, RoutedEventArgs e) {
            ink.InkPresenter.StrokeContainer.Clear();
        }


        private void btnReset_Click(object sender, RoutedEventArgs e) {
            inkTransform.Rotation = 0;
            inkTransform.ScaleX = 1;
            inkTransform.ScaleY = 1;
            inkTransform.TranslateX = 0;
            inkTransform.TranslateY = 0;
        }
    }
}