PIbd-23_Mochalov_D.V._Locomotive_Hard/DrawningLocomotive.java

import java.awt.*;

class DrawningLocomotive {
    public EntityLocomotive Locomotive;
    /// Левая координата отрисовки локомотива
    private float _startPosX;
    /// Верхняя координата отрисовки локомотива
    private float _startPosY;
    /// Ширина окна отрисовки
    private Integer _pictureWidth = null;
    /// Высота окна отрисовки
    private Integer _pictureHeight = null;
    /// Ширина отрисовки локомотива
    private final int _locomotiveWidth = 110;
    /// Высота отрисовки локомотива
    private final int _locomotiveHeight = 50;
    /// Инициализация свойств
    public void Init(int speed, float weight, Color bodyColor, EntityLocomotive entity)
    {
        Locomotive = entity;
        Locomotive.Init(speed, weight, bodyColor);
    }
    /// Установка позиции локомотива
    public void SetPosition(int x, int y, int width, int height)
    {
        if (x < 0 || x + _locomotiveWidth >= width)
        {
            return;
        }
        if (y < 0 || y + _locomotiveHeight >= height)
        {
            return;
        }
        _startPosX = x;
        _startPosY = y;
        _pictureWidth = width;
        _pictureHeight = height;
    }

    public void MoveTransport(Direction direction)
    {
        if (_pictureWidth == null || _pictureHeight == null)
        {
            return;
        }
        switch (direction)
        {
            // вправо
            case Right:
                if (_startPosX + _locomotiveWidth + Locomotive.Step() < _pictureWidth)
                {
                    _startPosX += Locomotive.Step();
                }
                else _startPosX = _pictureWidth - _locomotiveWidth;
                break;
            //влево
            case Left:
                if (_startPosX - Locomotive.Step() >= 0)
                {
                    _startPosX -= Locomotive.Step();
                }
                else _startPosX = 0;
                break;
            //вверх
            case Up:
                if (_startPosY - Locomotive.Step() >= 0)
                {
                    _startPosY -= Locomotive.Step();
                }
                else _startPosY = 0;
                break;
            //вниз
            case Down:
                if (_startPosY + _locomotiveHeight + Locomotive.Step() < _pictureHeight)
                {
                    _startPosY += Locomotive.Step();
                }
                else _startPosY = _pictureHeight - _locomotiveHeight;
                break;
        }
    }

    public void DrawTransport() {
        //TODO: do!
    }

    public void ChangeBorders(int width, int height)
    {
        _pictureWidth = width;
        _pictureHeight = height;
        if (_pictureWidth <= _locomotiveWidth || _pictureHeight <= _locomotiveHeight)
        {
            _pictureWidth = null;
            _pictureHeight = null;
            return;
        }
        if (_startPosX + _locomotiveWidth > _pictureWidth)
        {
            _startPosX = _pictureWidth - _locomotiveWidth;
        }
        if (_startPosY + _locomotiveHeight > _pictureHeight)
        {
            _startPosY = _pictureHeight - _locomotiveHeight;
        }
    }
}