turtle

README

Turtle

A Turtle Graphics System for Golang

Based on the python turtle, this Go package provides an environment to learn Go programming while getting instant feedback. The screen is updated in real time using the Ebitengine.

Install

Ebitengine is the main dependency. Check here the system specific instructions.

Example

go run github.com/gary23b/turtle/examples/turtlebasic@latest

Basic Example Program

package main

import (
	"github.com/gary23b/turtle/ebitencanvas"
	"github.com/gary23b/turtle/models"
	"github.com/gary23b/turtle/turtle"
	"github.com/gary23b/turtle/turtleutil"
)

func main() {
	// Create the Ebitengine canvas.
	params := ebitencanvas.CanvasParams{Width: 1000, Height: 1000}
	ebitencanvas.StartEbitenTurtleCanvas(params, drawFunc)
}

// drawFunc is started as a goroutine.
func drawFunc(can models.Canvas) {
	var t models.Turtle = turtle.NewTurtle(can)
	t.SetDegreesMode()
	t.PenColor(turtleutil.White)
	t.SetSpeed(1000)
	t.PenDown()

	t.Left(45)
	t.Forward(100)
	t.Left(135)
	t.Forward(200 * 0.707)
	t.GoTo(0, 0)
	t.SetAngle(-15)
	for i := 0; i < 12; i++ {
		t.Forward(100)
		t.Right(30)
	}
}