eceg431/09/Snake/Point.jack

// Simple coordinate class for clean position handling
// Provides basic x,y operations for snake and food placement
class Point {
    field int x, y;

    // create point at given coordinates
    constructor Point new(int ax, int ay) {
        let x = ax;
        let y = ay;
        return this;
    }

    // free memory
    method void dispose() {
        do Memory.deAlloc(this);
        return;
    }

    // get x coordinate
    method int getX() {
        return x;
    }

    // get y coordinate
    method int getY() {
        return y;
    }

    // update coordinates
    method void setX(int newX) {
        let x = newX;
        return;
    }

    method void setY(int newY) {
        let y = newY;
        return;
    }

    // check if this point equals another
    method boolean equals(Point other) {
        return (x = other.getX()) & (y = other.getY());
    }

    // move point by offset
    method void move(int dx, int dy) {
        let x = x + dx;
        let y = y + dy;
        return;
    }

    // copy this point to new point
    method Point copy() {
        return Point.new(x, y);
    }
}