figure.java

java实现的版画图程序

package drawfigure;

/**
 * <p>Title: </p>
 * <p>Description: </p>
 * <p>Copyright: Copyright (c) 2003</p>
 * <p>Company: </p>
 * @author unascribed
 * @version 1.0
 */
import java.awt.*;
import java.awt.geom.*;

public abstract class Figure {
	private Point2D startPoint = null;
	private Point2D endPoint = null;
	private boolean isFirstDraw = true; //是否第一次画
	private boolean isSelected = false;
	private boolean isMoving = false;
	private boolean isResizing = false;
	private boolean isDrawing = false;
	/**
	 * 固定点，resize时使用
	 */
	private int activePosi;

	public Point2D getStartPoint() {
		return startPoint;
	}
	public void setStartPoint(Point2D p) {
		//anchor=p;
		startPoint = p;
	}

	public Point2D getEndPoint() {
		return endPoint;
	}
	public void setEndPoint(Point2D p) {
		endPoint = p;
	}

	public boolean isFirstDraw() {
		return isFirstDraw;
	}
	public void setFirstDraw(boolean b) {
		isFirstDraw = b;
	}

	public boolean isSelected() {
		return isSelected;
	}
	public void selected() {
		isSelected = true;
	}
	public void unSelected() {
		isSelected = false;
	}

	public boolean isMoving() {
		return isMoving;
	}
	public void setMoving(boolean b) {
		isMoving = b;
	}

	public boolean isResizing() {
		return isResizing;
	}
	/**
	 * @param b
	 */
	public void setResizing(boolean b) {
		isResizing = b;
	}
	public void setResizing(boolean b, int posi) {
		setResizing(b);
		setActivePosition(posi);
	}

	public boolean isDrawing() {
		return isDrawing;
	}
	public void setDrawing(boolean b) {
		isDrawing = b;
	}

	public int getActivePosition() {
		return activePosi;
	}
	public void setActivePosition(int posi) {
		activePosi = posi;
	}

	public void setStartEndPoint(Point2D start, Point2D end) {
		this.setStartPoint(start);
		this.setEndPoint(end);
	}

	public Figure() {
	};
	public Figure(Point2D p) {
		this.setEndPoint((Point2D) p.clone());
		this.setStartPoint((Point2D) p.clone());
	}

	//抽象方法
	/**
	 * 判断点p是否在本图形的区域内
	 */
	public abstract boolean pointInside(Point2D p);
	/**
	 * 返回当前鼠标位置所在的控制块，
	 * 如果不在任何控制块内，返回null
	 */
	public abstract boolean pointInControlRect(Point2D p);
	public abstract ControlRect getControlRect(Point2D p);
	/**
	 * 同pointInResizeControl(Point2D p);
	 * @param p
	 * @return
	 */

	/**
	 * 根据点坐标在哪个选择块中，得到改变大小的光标类型 
	 */
	public Cursor getCursor(Point2D p) {
		ControlRect ctrl = this.getControlRect(p);
		if (ctrl != null) {
			return ctrl.getCursor();
		}
		return new Cursor(Cursor.DEFAULT_CURSOR);
	}
	/**
	 * 画图
	 * @param g
	 */
	public abstract void draw(Graphics g);

	/**
	 * 返回边界
	 * @return
	 */
	public Rectangle2D getBounds() {
		double x, y, width, height;
		x = Math.min(getStartPoint().getX(), getEndPoint().getX());
		y = Math.min(getStartPoint().getY(), getEndPoint().getY());
		width = Math.abs(getStartPoint().getX() - getEndPoint().getX());
		height = Math.abs(getStartPoint().getY() - getEndPoint().getY());
		return new Rectangle2D.Double(x, y, width, height);
	}

	/**
	* 移动，使用之前，需要先g.setXORMode(Color);
	* 似乎有点不妥!!===
	*/
	public void move(Graphics g, double offsetX, double offsetY) {
		if (isMoving()) {
			draw(g);
		}
		setStartEndPoint(
			new Point2D.Double(
				getStartPoint().getX() + offsetX,
				getStartPoint().getY() + offsetY),
			new Point2D.Double(
				getEndPoint().getX() + offsetX,
				getEndPoint().getY() + offsetY));
		draw(g);
		setMoving(true);
	}

	/**
		* 移动，使用之前，需要先g.setXORMode(Color);
		* 似乎有点不妥!!===
		* 不同的图形，实现不同，放到子类实现
		*/
	public void resize(Graphics g, double offsetX, double offsetY) {
		if (isResizing()) {
			draw(g);
		}
		Rectangle2D bound = getBounds();
		switch (getActivePosition()) {
			case ControlRect.LEFT_TOP_POSITION : //左上
				setStartPoint(
					new Point2D.Double(
						bound.getX() + offsetX,
						bound.getY() + offsetY));
				setEndPoint(
					new Point2D.Double(
						bound.getX() + bound.getWidth(),
						bound.getY() + bound.getHeight()));
				break;
			case ControlRect.TOP_POSITION : //上
				setStartPoint(
					new Point2D.Double(
						bound.getX(),
						bound.getY() + bound.getHeight()));
				setEndPoint(
					new Point2D.Double(
						bound.getX() + bound.getWidth(),
						bound.getY() + offsetY));
				break;
			case ControlRect.RIGHT_TOP_POSITION : //右上
				setStartPoint(
					new Point2D.Double(
						bound.getX(),
						bound.getY() + bound.getHeight()));
				setEndPoint(
					new Point2D.Double(
						bound.getX() + bound.getWidth() + offsetX,
						bound.getY() + offsetY));
				break;
			case ControlRect.RIGHT_POSITION : //右
				setStartPoint(new Point2D.Double(bound.getX(), bound.getY()));
				setEndPoint(
					new Point2D.Double(
						bound.getX() + bound.getWidth() + offsetX,
						bound.getY() + bound.getHeight()));
				break;
			case ControlRect.RIGHT_BOTTOM_POSITION : //右下角
				setStartPoint(new Point2D.Double(bound.getX(), bound.getY()));
				setEndPoint(
					new Point2D.Double(
						bound.getX() + bound.getWidth() + offsetX,
						bound.getY() + bound.getHeight() + offsetY));
				break;
			case ControlRect.BOTTOM_POSITION : //下
				setStartPoint(new Point2D.Double(bound.getX(), bound.getY()));
				setEndPoint(
					new Point2D.Double(
						bound.getX() + bound.getWidth(),
						bound.getY() + bound.getHeight() + offsetY));
				break;
			case ControlRect.LEFT_BOTTOM_POSITION : //左下
				setStartPoint(
					new Point2D.Double(
						bound.getX() + offsetX,
						bound.getY() + bound.getHeight() + offsetY));
				setEndPoint(
					new Point2D.Double(
						bound.getX() + bound.getWidth(),
						bound.getY() + bound.getHeight()));
				break;
			case ControlRect.LEFT_POSITION : //左
				setStartPoint(
					new Point2D.Double(bound.getX() + offsetX, bound.getY()));
				setEndPoint(
					new Point2D.Double(
						bound.getX() + bound.getWidth(),
						bound.getY() + bound.getHeight()));
				break;
		}
		draw(g);
		setResizing(true, getActivePosition());
	}

}