rotateaction.java

来自「一个简易的java画图软件」· Java 代码 · 共 76 行

package app.action;

import java.awt.event.ActionEvent;

import javax.swing.AbstractAction;

import draw.PaintCanvas;
import draw.View;

/**
 * 旋转当前图形的Action，主要用于键盘控制
 * 
 * @author Thihy
 * 
 */
public abstract class RotateAction extends AbstractAction {
	protected double theta;
	protected View view;

	/**
	 * 初始化这个Action。
	 * 
	 * @param view
	 *            当前Action所控制的画布
	 * @param theta
	 *            旋转的角度，顺时针为正
	 */
	public RotateAction(View view, double theta) {
		super();
		this.view = view;
		this.theta = theta;
	}

	/**
	 * 按照指定的theta旋转当前图形
	 */
	@Override
	public void actionPerformed(ActionEvent e) {
		try {
			PaintCanvas gbc = view.getCanvas();
			gbc.rotateCurrentFiguare(theta);
		} catch (NullPointerException evt) {
			// 啥也不做
		}
	}

	/**
	 * 向右旋转45度
	 * 
	 * @author Thihy
	 * 
	 */
	public static class Right extends RotateAction {
		public final static String ID = "rotateRight";

		public Right(View view) {
			super(view, 45);
		}
	}

	/**
	 * 向左旋转45度
	 * 
	 * @author Thihy
	 * 
	 */
	public static class Left extends RotateAction {
		public final static String ID = "rotateLeft";

		public Left(View view) {
			super(view, -45);
		}
	}

}