The new JEST® JS Game Engine v0.3 is now available for download on GitHub.
Source: https://github.com/jestingly/jest0.3
JEST® JS Game Engine v0.3 (formerly Gravity)
by Antago (God of Gravity) • author of Graal2001 & Destiny
Developer Notes — Changes from v0.2 to v0.3
- Marquee Tool — Undo/Redo Integration
The marquee selection tool is now integrated into the engine's undo/redo governor.
• Selecting and deselecting a marquee can be undone
• Floating and defloating a marquee can be undone
• Deleting a marquee can be undone - JANI Animation Editor (Beta)
Introduces an experimental JANI editor for composing animation script files.
• JANI files are nearly identical to Graal's GANI animation files
• Create and edit animation scripts
• Experimental — additional bug testing is needed
Enable or disable the editor in:
/js/embed/embed.js - NPC / Entity Support
NPCs can now be added directly to levels using the new Entities tool in the Level Editor.
• Add NPCs through the sidebar's Entities menu
• Press E to equip the Entities tool
• Click NPCs to select and manipulate them
• View all NPCs through the Entities sidebar
• Invisible NPCs and those using 1×1 pixel images can still be located through the sidebar
• Open an expanded Script editor to modify an NPC's code - Introducing Hooks
NPCs are generally referred to as Hooks within the JEST® engine.
A Hook represents custom code attached to a level, allowing developers to inject scripts and behaviors into their game worlds.
Hooks can also reference image assets for their visual representation. - Entity Image Paths
Entity images are loaded relative to:
/webfiles/files/images/
For testing existing Graal levels, images can be uploaded to:
/webfiles/files/images/misc/
Example:
If an image is stored in the misc directory, set the entity's image path to:
misc/[filename]
The engine will then locate and display the image. - Bug Fixes & Improvements
Various bugs, glitches, and internal issues have been addressed throughout the engine.
Application Configuration
Configure your JEST® application by editing the following files:
- index.html
- css/vars_local.css
- js/apps/jest/components/JestConfiguration_loc.js
- js/apps/jest/components/JestConfiguration_rem.js
Previously Introduced — v0.2 Features
The following features were introduced in v0.2 and remain part of the JEST® engine.
- WebSocket Support
Includes a WebSocket class for connecting to remote servers.
• Access via JestOnline - Cloud Synchronization
Data can be synchronized to a custom cloud server using JestCloud (beta). - Account System (Beta)
Includes a basic PHP login system.
• Primarily intended for creator applications
• Planned integration into JestPlay - Electron Support
Application can optionally be wrapped using Electron for desktop/mobile deployment. - Load Order System
Managed via load_order.txt
• Generate using: /build_js_bundle.py - Modular UI System
Includes a UI system for building forms and interfaces. - Built-in Applications
• Tile Editor
• Sprite Animator
→ Supports slicing spritesheets into animation sequences
Located in:
/js/jest/app/clients
Toggle apps in:
/js/embed/embed.js - Game World Architecture
Game worlds are defined using JSON (multiverse-ready structure). - File System
Files are handled through the JestFileLoader system.
Example:
/js/apps/jest/components/file/JestFileLoader.js - Image System
• JestImager → extends JestFileLoader
• JestGraphic → wraps image data
JEST® JS Game Engine v0.3
https://github.com/jestingly/jest0.3
Copyright © 1999–2026 • Antago (God of Gravity)