Turtle Graphics in Kotlin

Overview

Interface TurtleGraphicsContext is used to define commands (and colors as 'variables'). Commands executed on that context are aliased to TurtleGraphics:

typealias TurtleGraphics = TurtleGraphicsContext.() -> Unit

Drawing is done via the TurtleSurface interface, which currently has implementations for

• Compose Multiplatform (com.beetstra.turtlegraphics.compose.DrawScopeSurface)
• Java BufferedImage (com.beetstra.turtlegraphics.bitmap.DrawScopeSurface)
• SVG (com.beetstra.turtlegraphics.svg.SVGSurface)

The TurtleEngine class translates the TurtleGraphics to calls on the TurtleSurface classes.

fun TurtleSurface.draw(graphics: TurtleGraphics) = TurtleEngine(this).graphics()

Compose Multiplatform

Should work for Multiplatform without changes, but currently only Desktop/JVM example

• Use wizard to create simple example project
• copy relevant Gradle parts to this project
  • Plugin id("org.jetbrains.compose") version "1.6.0-alpha01"
  • several dependencies
  • compose.desktop { application { mainClass = ... } } }
• Make sure plugins are installed for preview functionality
• Implementation is based on Canvas / DrawScope

Jupyter Kotlin Notebook

• Update the settings to include the 'main' classpath for the project.
• Update the Gradle buildfile
  • Plugin kotlin("jupyter.api") version "0.12.0-110"
  • add setting kotlin.jupyter.add.scanner=true in gradle.properties.

Links

• General: https://github.com/Kotlin/kotlin-jupyter?tab=readme-ov-file
• Adding libraries: https://github.com/Kotlin/kotlin-jupyter/blob/master/docs/libraries.md