layer.java

来自「手机射击游戏源代码,nokia s60模拟器开发包,eclipse工具开发.不可」· Java 代码 · 共 53 行

package src;

import javax.microedition.lcdui.Graphics;

public abstract class Layer {
	protected int x;
	protected int y;
	protected int width;
	protected int height;
	protected boolean visible;

	protected Layer(int width, int height) {
		visible = true;
		setWidthImpl(width);
		setHeightImpl(height);
	}

	public void setPosition(int x, int y) {
		this.x = x;
		this.y = y;
	}

	public void move(int dx, int dy) {
		x += dx;
		y += dy;
	}

	public final int getWidth() {
		return width;
	}

	public final int getHeight() {
		return height;
	}

	public abstract void paint(Graphics g);

	void setWidthImpl(int width) {
		if (width < 0) {
			throw new IllegalArgumentException();
		} else {
			this.width = width;
		}
	}

	void setHeightImpl(int height) {
		if (height < 0) {
			throw new IllegalArgumentException();
		} else {
			this.height = height;
		}
	}
}