chessma.java

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package chs;

public class ChessMa extends ChessItem {
	public ChessMa(ChessBoard b, String id, int x, int y) {
		super(b, id, x, y);
	}
	
	public boolean isOnCross(int x, int y){
		int dx = Math.abs(this.x - x);
		int dy = Math.abs(this.y - y);
		return dx != 0 && dy != 0 && (dx+dy) == 3;
	}

	public boolean moveTo(int x, int y){
		if(!isOnCross(x, y)){
			System.err.println("not on a cross.");
			return false;
		}
		
		// 别腿了
		ChessItem c = b.findItemAt(this.getCenterX(x), this.getCenterY(y));
		if(null != c){
			System.err.println("found block:" + c.getId());
			return false;
		}
		
		return true;
	}
};