fogleman/gg
Gg
gg 是一个 Go 语言 2D 图形库和矢量图形引擎，专为程序化图像生成而设计。它提供了一个画布渲染 API 来创建自定义 2D 形状、路径和视觉资产，并可导出为 PNG 和 JPG 文件。
该工具包支持使用贝塞尔曲线和自定义路径构建复杂的几何图形。它支持多种渲染操作，包括填充和描边路径、应用线性和径向渐变，以及使用表面图案。
该库涵盖了广泛的功能，包括带有自动换行和尺寸测量的文本渲染、旋转和缩放等坐标变换，以及使用 Alpha 遮罩剪裁来限制绘图区域。它还通过基于栈的系统管理图形状态，以支持嵌套变换和样式。
Features
- 2D Vector Graphics Libraries - Provides a comprehensive API for drawing shapes, paths, and text in a two-dimensional vector space using Go.
- Canvas Rendering - Provides a raster-based canvas rendering engine for programmatic image generation in Go.
- Canvas and Paint APIs - Offers programmatic interfaces for defining drawing styles and executing rendering commands on a surface.
- Canvas Coordinate Transformations - Implements canvas coordinate modifications including translation, scaling, rotation, and skewing.
- Programmatic Image Toolkits - Provides a set of tools for creating PNG and JPG files through 2D drawing and font rendering.
- Go Graphics Libraries - Provides a specialized toolkit for rendering 2D shapes and text using a coordinate-based canvas in Go.
- Shape Drawing - Renders geometric primitives including circles, rectangles, ellipses, polygons, and arcs.
- Path Geometry Construction - Enables the construction of complex geometry using cubic and quadratic Bezier curves and custom paths.
- Composite Path Construction - Constructs complex vector paths by combining linear segments and Bezier curves.
- Fill and Stroke Styles - Applies colors, gradients, and patterns to define the interior and boundaries of vector shapes.
- Transformation Stacks - Implements a transformation stack to save and restore nested matrix transformations.
- Vector Rasterizers - Converts mathematical vector definitions, including Bezier curves and paths, into pixel-based raster images.
- Text Rendering - Renders text strings onto a canvas with support for fonts, alignment, and word wrapping.
- Raster Image Renderers - Implements a rendering engine to produce high-quality PNG and JPG files with custom layouts and gradients.
- Graphics State Management - Manages graphics state by saving and restoring stacks of style and transformation settings.
- Raster Image Exporters - Exports final visual output to disk or writers in PNG and JPG formats.
- Canvas Image Positioning - Provides logic for aligning and positioning external images on the rendering canvas.
- Dynamic Image Renderers - Enables programmatic generation of images like banners and charts based on runtime functions.
- Gradient Renderers - Renders smooth linear and radial color transitions across graphical elements.
- Image Blitting - Allows placing external image data onto the drawing canvas by mapping source pixels to target coordinates.
- Clipping Regions - Defines path-based clipping regions to restrict the visible rendering area of the canvas.
- Text Dimension Measurement - Calculates the exact pixel width and height of text segments for custom layout rendering.
- Clipping Path Applications - Provides tools for restricting rendering areas using defined vector paths or alpha masks.
- Surface Patterns - Supports filling shapes and strokes using repeating surface patterns and gradients.
- Image Processing - Pure Go 2D rendering library.
