MonoGame.Samples/MultiTouch

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