Hello ImGui

Hello ImGui#

Hello ImGui is a library designed to make multiplatform app development as simple as writing a “Hello World” program, built on top of Dear ImGui.

Its flexibility makes it suited for complex applications, as well as for simple prototypes; allowing you to focus on the creative aspects of your projects.

Features#

Multiplatform utilities

  • Seamlessly multiplatform: supports Linux, Windows, macOS, iOS, Android, and Emscripten with minimal setup (1 line of CMake code)

  • Asset embedding across all platforms (no code required)

  • Effortless app customization, including app icons and names for mobile platforms (no code required)

  • Universal application icon customization, extending to mobile and macOS (no code required)

Dear ImGui Tweaks

  • Power Save mode: optimize performance by reducing FPS when idle

  • High DPI support: automatically scales UI to match screen DPI on any platform.

  • Enhanced layout handling: dockable windows and multiple layouts for complex UIs

  • Window geometry utilities: autosize application window, restore app window position

  • Theme tweaking: extensive list of additional themes

  • Support for movable and resizable borderless windows

  • Advanced font support: icons, emojis and colored fonts

  • Integration with ImGui Test Engine: automate and test your apps

  • Save user settings: window position, layout, opened windows, theme, user defined custom settings

  • Easily add a custom 3D background to your app

Backends

  • Available platform backends: SDL2, Glfw3

  • Available rendering backends: OpenGL3, Metal, Vulkan, DirectX

Full manual (PDF)#

View or download the full pdf for this manual. You may feed it into a LLM such as ChatGPT, so that it can help you when using Hello ImGui.

Demos & real world apps#

Motto#

The minimum code to start developing a GUI app should be… minimal. Here is a multiplatform Hello World in 7 lines.

6 lines of C++

#include "hello_imgui/hello_imgui.h"
int main(int , char *[]) {
    HelloImGui::Run(
        []{ ImGui::Text("Hello, world!"); }, // Gui code
        "Hello!", true);                     // Window title + Window size auto
}

1 line of CMake

hello_imgui_add_app(hello_world hello_world.cpp)

Advanced layout#

The docking demo show how to handle complex layouts, use themes, store user settings, reduce FPS and CPU usage when idling, load fonts and icons, and much more

Online demo - Source - Video tutorial: how to handle multiple complex layouts

Custom 3D background#

How to use a custom 3D background in your app

Online demo - Source

ImGui Manual#

ImGui Manual is an interactive Manual for Dear ImGui, built with Hello ImGui.

Online manual - Source

RPN Calculator#

RPN Calculator is a simple RPN calculator, built, built to demonstrate how easy a multiplatform app can be built with Hello ImGui.

Online demo - Source - Video tutorial

Starter template#

The starter template will get you started in 5 minutes, and shows how to embed assets, customize the app icon (etc.), on all platforms.

Dear ImGui Bundle#

Dear ImGui Bundle, a full-fledged library, built on top of Hello ImGui, provides lots of additional widgets (imgui, implot, imgui-node-editor, ImFileDialog, ImGuiColorTextEdit, imgui_md), as well as complete python bindings.

online interactive demo - Source for C++ demos - Source for Python demos

Theme tweaking#

How to use the theme tweaking utilities provided by Hello ImGui

Online video tutorial

About#

Credits#

Hello ImGui is based on Dear ImGui (MIT License), by Omar Cornut. Portions use ImGui Test Engine, which is governed by a specific license

Portions of this software use the FreeType Project, plutosvg (MIT License), GLFW (zlib/libpng license), SDL (zlib license).

License#

Hello ImGui is licensed under the MIT License, see LICENSE

Contribute#

Quality contributions are welcome!

Support the project#

Hello ImGui is a free and open source project, and its development and maintenance require considerable efforts.

If you find it valuable for your work – especially in a commercial enterprise or a research setting – please consider supporting its development by making a donation. Thank you!

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