@jawirhytam/kurokuro/kurokuro.js

A DjawaScript Turtle Graphics library.

// kurokuro.js - DjawaScript Turtle Graphics Library

(function(global) {
    const canvas = document.getElementById('kurokuroCanvas');
    const ctx = canvas.getContext('2d');
    const centerX = canvas.width / 2;
    const centerY = canvas.height / 2;

    // The Turtle class
    class Kuro {
        constructor() {
            this.reset();
            this.init();
        }

        init() {
            ctx.beginPath();
            ctx.moveTo(this.x, this.y);
        }

        reset() {
            this.x = centerX;
            this.y = centerY;
            this.angle = -90; // Start facing up
            this.penDown = true;
            ctx.clearRect(0, 0, canvas.width, canvas.height);
            this.init();
        }

        _draw(distance) {
            const rad = (this.angle * Math.PI) / 180;
            const newX = this.x + distance * Math.cos(rad);
            const newY = this.y + distance * Math.sin(rad);

            if (this.penDown) {
                ctx.lineTo(newX, newY);
                ctx.stroke();
            } else {
                ctx.moveTo(newX, newY);
            }

            this.x = newX;
            this.y = newY;
        }

        maju(distance) {
            this._draw(distance);
        }

        mundur(distance) {
            this._draw(-distance);
        }

        mengen(degrees) {
            this.angle += degrees;
        }

        mengiri(degrees) {
            this.angle -= degrees;
        }

        penMunggah() {
            this.penDown = false;
        }

        penMudun() {
            this.penDown = true;
        }
    }

    // --- Global API for DjawaScript ---
    // Create a single global instance of our turtle
    const kura = new Kuro();

    global.maju = function(distance) {
        kura.maju(distance);
    };

    global.mundur = function(distance) {
        kura.mundur(distance);
    };

    global.mengen = function(degrees) {
        kura.mengen(degrees);
    };

    global.mengiri = function(degrees) {
        kura.mengiri(degrees);
    };

    global.penMunggah = function() {
        kura.penMunggah();
    };

    global.penMudun = function() {
        kura.penMudun();
    };
    
    global.reset = function() {
        kura.reset();
    }

    console.log("Kurokuro library loaded.");

})(window);