Projects sharing features with Leonsans

Lucky Canvas is a canvas-based lottery component library that enables developers to build interactive prize wheels, grid-based lottery games, and slot machines for web and mobile applications. The project provides a rendering engine that draws directly on HTML Canvas elements, with automatic device pixel ratio scaling to ensure crisp displays on high-DPI mobile screens. The library packages each lottery type as a self-contained plugin with its own configuration and rendering logic, and wraps the core canvas functionality in framework-specific bindings for Vue, React, Taro, and UniApp without

Pretext is a canvas-based text layout engine designed to calculate precise text dimensions and line breaks for custom rendering. It serves as a rich text measurement tool and a cross-browser typography normalizer, enabling the determination of pixel-perfect widths and heights for mixed inline content without relying on browser CSS. The project distinguishes itself through its ability to handle complex typography and dynamic layouts. It implements language-specific segmentation rules for CJK and Hangul scripts and corrects emoji width variances between DOM and canvas rendering. Additionally, i

ShapeShifter is a visual editor and utility for creating morphing animations between SVG vector paths. It serves as an interpolation editor that allows for the alignment and modification of vector points to produce fluid transitions between different shapes. The project functions as a cross-platform vector asset generator, exporting animation data as spritesheets and drawable files for use on Android, iOS, and web platforms. It specializes in converting disparate SVG path commands into a unified format to ensure a one-to-one point mapping between shapes. The tool includes capabilities for pa

gg is a Go 2D graphics library and vector graphics engine designed for programmatic image generation. It provides a canvas rendering API to create custom 2D shapes, paths, and visual assets, which can be exported as PNG and JPG files. The toolkit enables the construction of complex geometry using Bezier curves and custom paths. It supports a variety of rendering operations, including filling and stroking paths, applying linear and radial gradients, and utilizing surface patterns. The library covers a broad range of capabilities, including text rendering with word wrapping and dimension measu

Geist is an open-source font family and typography collection designed for high legibility in technical interfaces. It consists of a series of web-optimized typefaces, including geometric sans-serif, monospaced, and pixel styles. The collection functions as a variable font library, utilizing coordinate interpolation to allow precise control over weight and style within a single font file. These fonts are built as OpenType typefaces, incorporating standardized layout tables to define advanced typographic behaviors such as kerning and ligatures. The project provides specific implementations fo

Konva is an object-oriented HTML5 canvas framework designed for building interactive 2D graphical applications. It provides a hierarchical scene graph that organizes shapes, images, and text into manageable nodes, groups, and layers. By mapping application state to canvas elements, the library enables developers to create complex visual interfaces using declarative patterns that synchronize with modern component-based frameworks. The library distinguishes itself through a robust event system that supports hit detection, bubbling, and direct manipulation of graphical objects, such as dragging,

This project is a virtual whiteboard component and vector graphics editor designed for creating diagrams with a hand-drawn aesthetic. It provides a canvas-based drawing engine that can be embedded directly into web applications, allowing users to manipulate shapes, upload images, and export visual data into standard formats like PNG, SVG, or JSON. The platform distinguishes itself through a real-time synchronization layer that supports multi-user collaboration across distributed environments. This engine utilizes end-to-end encryption to secure shared sessions and employs a local-first data p

Flame is a 2D game engine and framework for Flutter. It provides a component-based architecture to organize scene entities and manage their lifecycles through a structured hierarchy of game objects, coordinated by a consistent game loop. The engine includes a graphics library for rendering animated sprites, particle effects, and external textures. It features a 2D physics integration layer that supports rigid body dynamics and collision detection between entities. The framework covers additional capabilities for game engineering, including user input capture for gestures and gamepads, audio

This is a React animation library providing a collection of components for creating choreographed motion, complex transitions, and SVG morphing. It functions as a motion design specification and a UI component animation wrapper system used to apply 3D transforms, Bezier curves, and entry-exit transitions to interface elements. The project includes a scroll-driven animation suite for synchronizing UI movements and parallax effects with the viewport position, as well as an SVG motion framework for animating paths, drawing lines incrementally, and interpolating coordinates for shape morphing. I

jspaint is a web-based reimplementation of Microsoft Paint, built entirely in JavaScript to run in a browser. It recreates the classic desktop application by reverse-engineering the original Win32 API calls and event handling, rendering the entire interface onto an HTML5 canvas for pixel-perfect retro graphics. The project preserves the original file format compatibility with BMP, PNG, GIF, and JPEG, ensuring exact pixel data matches the legacy application. The application maintains a complete undo history stack using compressed image snapshots, and offloads computationally intensive image pr

react-konva is a declarative React canvas graphics library and 2D vector graphics framework. It serves as a rendering engine and interactive canvas toolset that allows for the drawing and management of complex 2D shapes and graphics using a React component model. The library maps reactive component trees to an underlying object-oriented graphics scene graph, enabling the synchronization of visual states with application data. It provides specialized tools for building interactive graphical interfaces, including support for multi-touch gestures, drag-and-drop functionality, and real-time trans

JsBarcode is a JavaScript library for generating machine-readable barcodes in both browser and Node.js environments. It supports a wide range of industry-standard symbologies including CODE128, EAN, UPC, CODE39, ITF-14, MSI, Codabar, Pharmacode, and GS1-128, with automatic check digit calculation for formats that require it. The library renders barcodes to HTML canvas elements, scalable SVG graphics, or image elements, and provides a chainable API for creating multiple barcodes sequentially with individual options. It includes automatic checksum computation for EAN, UPC, ITF-14, and MSI forma

This project is a cross-platform mobile graphing library designed for rendering high-performance animated line charts and data visualizations. It functions as a canvas-based data visualization system and interactive charting component for mobile applications. The library focuses on animated data visualization, using interpolation to create smooth visual transitions between different data sets. It utilizes a GPU-accelerated graphics engine to maintain high frame rates and fluid transitions during data updates. The capability surface includes interaction systems for tracking pan gestures and d

KLineChart is a high-performance financial charting library and data visualization engine. It uses native browser canvas APIs to render interactive candlestick charts and time-series financial data for web and mobile applications. The library is built as a plugin-based framework, allowing for the integration of custom calculation logic and rendering routines. This modular architecture enables the addition of technical analysis visualization tools and custom indicators to financial dashboards. The system handles real-time market data updates and computes technical indicators to visualize mark

JBChartView is an iOS charting library and data visualization framework used to render interactive line and bar graphs. It provides reusable user interface components for displaying numerical data series through smooth line curves and grouped or horizontal bar charts. The framework is distinguished by its ability to morph bars and lines between different data states, creating visual transitions that represent changes in underlying data models. It also includes interaction handling that detects user selections on specific data points and returns the associated model instances. The library cov

Source Code Pro is a collection of monospaced OpenType font families designed for programming, user interface clarity, and coding environments. These typefaces are engineered to provide high legibility in software editors and terminal applications. The project includes a variable font family that allows for continuous adjustments of weight and style within a single file. It provides specialized typography for user interface design to ensure consistency across diverse digital layouts. The system covers monospaced typography design and web integration, supporting the generation and export of f

Framer - Design Everything

tsparticles is a JavaScript particle engine and canvas visual effects toolkit used to create animated particle systems, interactive backgrounds, and web animations. It functions as a web animation library that provides a set of compatible wrappers for integration into React, Vue, Angular, and Svelte applications. The engine includes pre-built animation patterns for celebratory effects, such as confetti explosions and fireworks. It allows for the creation of custom JavaScript visualizations through a plugin system that enables the development of specialized shapes and behaviors. The toolkit s

Logoly is a browser-based logo editor that generates logos mimicking the signature visual style of popular platforms. It renders logo previews by drawing vector graphics directly onto an HTML canvas element, managing all editor state entirely within the browser. The tool provides real-time customization of logo text, color, and font size through an interactive on-screen editor, with instant preview updates as adjustments are made. It applies visual styles by mapping user-selected colors and fonts to CSS-like properties on SVG elements, and uses predefined layout templates to position text and

Luckysheet upgraded to Univer

canvas-confetti is an HTML5 canvas animation library and browser particle effect engine designed to render celebratory confetti bursts. It functions as a visual effects tool that transforms SVG paths, emojis, and text into animated particles. The library offloads heavy particle calculations to a web worker to maintain main thread responsiveness and prevent the user interface from lagging. It includes built-in support for operating system reduced motion settings, automatically disabling animations for users with motion sensitivities to ensure accessibility compliance. The system supports conf

This is a chart library for rendering interactive data visualizations within WeChat Mini Programs using the Apache ECharts engine. It provides a set of visual components that use 2D canvas interfaces to render line, bar, pie, and scatter plots. The library utilizes a 2D canvas interface to increase drawing speed and resolve visual layering issues. It implements an interactive charting component that supports touch-based data interaction, allowing users to see detailed contextual information through formatted tooltips when tapping or hovering over data points. The project covers mobile data v

Apache ECharts is a JavaScript data visualization library used for rendering interactive charts and complex data visualizations in web browsers. It functions as a canvas-based charting engine and a statistical data visualization suite that transforms datasets into visual representations. The framework provides specialized capabilities for three-dimensional data visualization, including the generation of 3D plots and globe visualizations. It also serves as a web-based geographic mapping tool for overlaying heatmaps, routes, and data distributions onto interactive maps. The library covers a br

Macaw is a Swift vector graphics library and animation framework used to create and render scalable geometric shapes and text. It functions as an SVG rendering engine and an interactive vector graphics toolkit for displaying complex artwork while maintaining image quality at any scale. The framework enables the animation of shape properties and node transformations, including the ability to morph one vector path into another. It allows for the integration of external SVG files and the application of linear and radial gradients to fills and strokes. The toolkit covers a range of capabilities

AndroidNote is a technical knowledge base and reference resource for Android development. It provides comprehensive guidance on application architecture, custom view development, and advanced graphics programming. The project is distinguished by its depth in visual implementation, covering pseudo-3D perspective projections via virtual cameras and complex 2D rendering using Bézier curves and PorterDuff color blending. It also provides detailed methodologies for app modularization and the management of internal libraries through private Maven repositories and JitPack. The reference surface ext