https://github.com/feenkcom/sparta

Sparta is a canvas on top of Skia.
https://github.com/feenkcom/sparta

pharo vector-graphics

Last synced: about 2 months ago
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Sparta is a canvas on top of Skia.

• Host: GitHub
• URL: https://github.com/feenkcom/sparta
• Owner: feenkcom
• License: mit
• Created: 2016-08-23T14:59:21.000Z (almost 8 years ago)
• Default Branch: main
• Last Pushed: 2024-04-02T12:03:47.000Z (3 months ago)
• Last Synced: 2024-04-14T10:25:36.865Z (3 months ago)
• Topics: pharo, vector-graphics
• Language: Smalltalk
• Homepage: https://gtoolkit.com
• Size: 4.01 MB
• Stars: 31
• Watchers: 13
• Forks: 7
• Open Issues: 2
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

Lists

• awesome-pharo - Sparta - Sparta is an almost stateless vector graphics API for Pharo that provides bindings to the Moz2D rendering backend. (Graphics)

README

        
# Sparta

Sparta is an almost stateless vector graphics API for Pharo that provides bindings to the Skia rendering backend.

### Install

**More detailed installation guide is described in [INSTALL.md](INSTALL.md)**

Sparta requires an extra Skia vm plugin. The plugin for the current OS and VM (64 bit) is downloaded and installed automatically together with all needed packages.

```smalltalk 

Metacello new

    baseline: 'Sparta';

    repository: 'github://feenkcom/sparta/src';

    load

```

### Overview

*(All images are rendered using Sparta in Glamorous Toolkit)*

!["Sparta" string rendered with applied neon filter](screenshots/Sparta-v1-Neon.png "Neon filter")

### Backends

Skia, and as result Sparta, has support of native OS graphic engines, as well as cross platform ones.

On all platforms Sparta provides support of [Cairo](https://cairographics.org) and [Skia](https://skia.org/). Additionally, high performant [CoreGraphics and CoreGraphics Accelerated](https://developer.apple.com/reference/coregraphics) on Mac OS and [Direct2D](https://msdn.microsoft.com/en-us/library/windows/desktop/dd317121(v=vs.85).aspx) on Windows.

In total Sparta supports 5 different rendering backends. 

### Text

One of the biggest improvements compared to existing graphics engines from Pharo is advanced high quality text rendering with multi-language support.

![Multilanguage support in Sparta](screenshots/Sparta-v1-Multilanguage.png "Sparta Multilanguage")

The current Pharo text rendering engines draw a piece of text with one concrete font and style. If the font does not have an appropriate character, a stub glyph will be rendered instead.

Sparta introduces a notion of font groups that allow us to achieve a smooth fallback font detection based on the selected font style, language and missing glyphs. Fallback font support requires more complex text measurement, as multiple fonts faces are involved to render a single piece of text.

### Filters

Since Sparta is based on the Moz2D backend that was designed for web browsers, we can get support for a wide variety of [filter primitives](https://www.w3.org/TR/SVG/filters.html). Sparta provides an ability to compose multiple filter primitives to get a single, advanced filter. For example, with the help of ColorMatrix and TableTransfer filters we can simulate some popular Instagram-like filters, for example Nashville, Inkwell or Brannan.

![Instagram-like filters implemented with Sparta](screenshots/Sparta-v1-Filters.png "Sparta Filters")

### Basic drawings

We should not forget that first of all Sparta is a vector graphics engine. It allows developers to create, fill and stroke custom paths and shapes. Together with gaussian blur, we can achieve astonishing results that were not possible before.

![Basic vector graphics in Sparta](screenshots/Sparta-v1-Shapes.png "Sparta Shapes")