2.0.0

First stable release of the 2.x series — a from-scratch rewrite of
TortoiseGraphics for Swift 6
strict concurrency and SwiftUI. There are no code changes since
2.0.0-beta12; the beta sections below record how the release was built up.

Highlights

• Event-sourcing core. Tortoise accumulates an immutable
  [TortoiseCommand] stream, and every renderer consumes that same stream
  through the pure CommandPlayer.play(commands:). TortoiseState.applying(_:)
  is the single state-transition reducer shared by recording and replay
• TortoiseUI. TortoiseCanvas animates the drawing on TimelineView +
  Canvas with sub-frame interpolation, so the tortoise visibly walks as it
  draws. TortoisePlayer adds pause, single-step, seek, and a viewer-side
  speed override; .tortoiseViewport(_:) and .tortoiseSprite(_:) configure
  scaling and the tortoise's own artwork
• TortoiseSVG. Export any drawing as an SVG string or file, with the
  viewBox cropped to the drawing by default (fit: false keeps the full
  canvasSize)
• Serialization. TortoiseCommand, Color, Point, and Size are
  Codable with a hand-written JSON wire format that is frozen for the 2.x
  series, so recorded drawings can be persisted as app documents or golden
  files
• Linux. TortoiseCore and TortoiseSVG build and pass their tests on
  Linux; TortoiseUI requires SwiftUI and is omitted there

Installation

A plain from: "2.0.0" requirement now resolves — the from: "2.0.0-beta1"
prerelease lower bound the README asked for during the beta is no longer
needed.

Breaking changes from 1.x

• Renamed: Vec2D → Point, Size2D → Size, Turtle/turtle →
  Tortoise/tortoise throughout
• Removed: Python-style shorthand aliases (fd, bk, rt, lt, pu,
  pd, etc.)
• Requires Swift 6.2+ / Xcode 26+ / iOS 26+ · macOS 26+ · visionOS 26+

Full Changelog: 2.0.0-beta12...2.0.0