plane.java

一个关于沉船的J2ME小游戏

// Plane class

import javax.microedition.lcdui.*;

class Plane
{
	public  int		x;		// X location of plane
	public  int		y;		// Y location of plane
	public  int		oldX;		// Old X location
	public  int		oldY;		// Old Y location
	private int		width;	// Width of plane gfx
	private int		height;	// Height of plane gfx
	public  int		mx;		// Amount of x pixels to move plane right
	private int		my;		// Amount of y pixels to move plane down
	private int		xStart;	// Plane column start location
	private int		xEnd;		// Plane column end location
	private int		yStart;	// Plane row start location
	private int		yEnd;		// Plane row end location
	public  int		down;		// Amount of times the plane has moved down
	public  int		speedInc;	// How often the speed increases

	// Create a Plane Class
	// Store all required variables
	Plane(int iWidth, int iHeight, int moveX, int moveY, int iXS, int iXE, int iYS, int iYE)
	{
		this.x = 0;
		this.y = 0;
		this.oldX = this.x;
		this.oldY = this.y;
		this.width  = iWidth;
		this.height = iHeight;
		this.mx     = moveX;
		this.my     = moveY;
		this.xStart = iXS;
		this.xEnd   = iXE;
		this.yStart = iYS;
		this.yEnd   = iYE;
	}

	// Get x
	int getX()
	{
		return this.x;
	}
	// Get y
	int getY()
	{
		return this.y;
	}
	// Get oldX
	int getOldX()
	{
		return this.oldX;
	}
	// Get y
	int getOldY()
	{
		return this.oldY;
	}
	// Get width
	int getWidth()
	{
		return this.width;
	}
	// Get Height
	int getHeight()
	{
		return this.height;
	}

	// Initialize a plane as per the start of a level
	void init(int moveX, int howOften)
	{
		this.x = this.xStart;
		this.y = this.yStart;
		this.oldX = this.x;
		this.oldY = this.y;
		this.mx = moveX;
		this.down = 0;
		this.speedInc = howOften;
	}

	// Move the plane - return true if plane lands
	// the level determines the how often the plane is sped up
	boolean move()
	{
		// Save the location so we can replace the background
		this.oldX = this.x;
		this.oldY = this.y;

		// First check to see if we have landed
		if (this.y >= this.yEnd && (this.x + this.mx + this.width) >= this.xEnd) return true;

		// Calculate the new location
		this.x += this.mx;
		if (this.x > xEnd)
		{
			this.x = this.xStart;
			this.y += my;
			this.down++;
			if ((this.down % this.speedInc) == 0) this.mx++;
			if (this.mx > 4) this.mx = 4;
		}
		return false;
	}

	void setSpeed(int moveX)
	{
		this.mx = moveX;
	}

	boolean moveDown()
	{
		// First check to see if we have landed
		if (this.y >= this.yEnd) return true;

		this.y += my;

		return false;
	}
}