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MultiTouch Sample

A MonoGame 3.8.* sample demonstrating multi-touch input and drawing functionality. This sample allows users to draw on the screen using touch input or mouse, with support for multiple simultaneous touch points.

Features

  • Multi-touch drawing support
  • Colorful brush strokes for multiple touch points
  • Screen clearing functionality (Space key or gamepad A button)
  • Cross-platform support for Windows, DesktopGL, iOS, and Android

Platforms & Structure

This sample uses a modern, multi-project structure:

  • /Core — Shared game logic (Game1.cs, MultiTouch.Core.csproj)
  • /Platforms/Windows — Windows DirectX entry point and project
  • /Platforms/Desktop — DesktopGL entry point and project
  • /Platforms/Android — Android entry point and project
  • /Platforms/iOS — iOS entry point and project
  • /Content — Game assets (textures)

Each platform folder contains its own .csproj and entry point, referencing the shared /Core project.

Prerequisites

  • .NET 8.0 or later
  • MonoGame 3.8.* (installed via NuGet packages)
  • For Android: Android SDK and appropriate build tools
  • For iOS: Xcode and iOS development tools (macOS only)

Building and Running

Visual Studio

  1. Open MultiTouch.sln in Visual Studio
  2. Set the desired platform project as the startup project (e.g., Platforms/Windows/MultiTouch.Windows.csproj)
  3. Build and run (F5)

VS Code

  1. Open the project folder in VS Code
  2. Use Ctrl+Shift+P and run "Tasks: Run Task"
  3. Select one of:
    • build-windows / run-windows
    • build-desktopgl / run-desktopgl
    • build-android / run-android
    • build-ios / run-ios

Or use the launch configurations in .vscode/launch.json for debugging.

Command Line

Windows

 dotnet build Platforms/Windows/MultiTouch.Windows.csproj
 dotnet run --project Platforms/Windows/MultiTouch.Windows.csproj

DesktopGL

 dotnet build Platforms/Desktop/MultiTouch.DesktopGL.csproj
 dotnet run --project Platforms/Desktop/MultiTouch.DesktopGL.csproj

Android

 dotnet build Platforms/Android/MultiTouch.Android.csproj
 # Deploy to connected device or emulator
 dotnet build Platforms/Android/MultiTouch.Android.csproj -t:Run

iOS (macOS only)

 dotnet build Platforms/iOS/MultiTouch.iOS.csproj
 # Deploy to connected device or simulator
 dotnet build Platforms/iOS/MultiTouch.iOS.csproj -t:Run

Controls

  • Touch/Mouse: Draw on the screen
  • Space or Gamepad A: Clear the screen
  • Escape or Gamepad Back: Exit the application

Project Structure

/Core
    Game1.cs
    MultiTouch.Core.csproj
/Platforms
    /Windows
        MultiTouch.Windows.csproj
        Program.cs
    /Desktop
        MultiTouch.DesktopGL.csproj
        Program.cs
    /Android
        MultiTouch.Android.csproj
        MainActivity.cs
    /iOS
        MultiTouch.iOS.csproj
        Program.cs
/Content
    sqbrush.png
    circle.png

Content

The sample uses the following content files:

  • sqbrush.png — Brush texture for drawing
  • circle.png — Circle texture (unused in current implementation)

These are included as .xnb files and loaded directly without requiring MonoGame Content Pipeline compilation.

Notes

  • This project has been modernized to use:
    • .NET 8.0 target frameworks
    • SDK-style project files
    • MonoGame 3.8.* NuGet packages
    • Modern C# code patterns
    • Platform-specific folders and entry points (no more #if/#endif blocks)
  • The accelerometer functionality from the original sample has been replaced with keyboard/gamepad input for cross-platform compatibility