linefigure.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 class LineFigure extends Figure implements Cloneable {
	//两个可用来改变大小的控制块矩形
	private ControlRect controlRect1, controlRect2;
	public ControlRect getControlRect1() {
		return controlRect1;
	}
	public void setControlRect1(ControlRect rect1) {
		controlRect1 = rect1;
		if (controlRect1 != null && controlRect2 != null) {
			adjustContrlRectPosi(); //调整
		}
	}
	public void setControlRect2(ControlRect rect2) {
		controlRect2 = rect2;
		if (controlRect1 != null && controlRect2 != null) {
			adjustContrlRectPosi(); //调整
		}
	}
	public ControlRect getControlRect2() {
		return controlRect2;
	}

	public void setStartPoint(Point2D start) {
		super.setStartPoint(start);
		setControlRect1(new ControlRect(start));
	}
	public void setEndPoint(Point2D end) {
		super.setEndPoint(end);
		setControlRect2(new ControlRect(end));
	}

	public LineFigure() {
	}
	public LineFigure(Point2D p) {
		super(p);
	}

	public Object clone() {
		LineFigure lineFigure = new LineFigure();
		lineFigure.setStartPoint((Point2D) getStartPoint().clone());
		lineFigure.setEndPoint((Point2D) getEndPoint().clone());
		return lineFigure;
	}
	public void draw(Graphics g) {
		Graphics2D g2 = (Graphics2D) g;
		g2.draw(
			new Line2D.Double(
				getStartPoint().getX(),
				getStartPoint().getY(),
				getEndPoint().getX(),
				getEndPoint().getY()));
		if (isSelected()) {
			Color oldColor = g2.getColor();
			g2.setColor(Color.black);
			controlRect1.paint(g2);
			controlRect2.paint(g2);
			g2.setColor(oldColor);
		}
	}
	/**  
	 * 返回点p所在的控制块，如果不在，返回null
	 *  (non-Javadoc)
	 * @see drawfigure.Figure#pointInResizeControl(java.awt.Point)
	 */
	public boolean pointInControlRect(Point2D p) {
		if (controlRect1.pointInside(p))
			return true;
		if (controlRect2.pointInside(p))
			return true;
		return false;
	}
	public ControlRect getControlRect(Point2D p) {
		if (controlRect1.pointInside(p))
			return controlRect1;
		if (controlRect2.pointInside(p))
			return controlRect2;
		return null;
	}
	/**
		*  (non-Javadoc)
		* @see drawfigure.Figure#resize(java.awt.Graphics, java.awt.Point)
		*/
	/*	public void resize(Graphics g,double offsetX,double offsetY) {
			this.draw(g);
			
		}
	*/

	public boolean pointInside(Point2D p) {
		double maxX, maxY, minX, minY;
		double k, b;
		maxX = Math.max(getStartPoint().getX(), getEndPoint().getX());
		minX = Math.min(getStartPoint().getX(), getEndPoint().getX());
		maxY = Math.max(getStartPoint().getY(), getEndPoint().getY());
		minY = Math.min(getStartPoint().getY(), getEndPoint().getY());

		if (maxX - minX < 5) { //如果是垂直线
			return (Math.abs(p.getX() - maxX)) <= 5
				&& (p.getY() < maxY)
				&& (p.getY() > minY);
		} else if (maxY - minY < 5) { //如果是水平线
			return (Math.abs(p.getY() - maxY) <= 5)
				&& (p.getX() < maxX)
				&& (p.getX() > minX);
		} else { //根据公式判断
			//判断公式为：y = k * x + b  斜率：k = (y2 - y1) / (x2 - x1) y轴截距：b = y1 - k * x1
			k =
				(double) (getEndPoint().getY() - getStartPoint().getY())
					/ (getEndPoint().getX() - getStartPoint().getX());
			b = (double) getStartPoint().getY() - k * getStartPoint().getX();
			if ((p.getY() >= (k * p.getX() + b) - 5)
				&& (p.getY() <= (k * p.getX() + b) + 5)
				&& (p.getX() >= minX)
				&& (p.getX() <= maxX)
				&& (p.getY() >= minY)
				&& (p.getY() <= maxY)) {
				return true;
			}
		}
		return false;
	}

	public void setStartEndPoint(Point2D start, Point2D end) {
		setStartPoint(start);
		setEndPoint(end);
		controlRect1 = new ControlRect(start);
		controlRect2 = new ControlRect(end);
	}
/*	public Cursor getCursor(Point2D p) {
		ControlRect ctrl = this.getControlRect(p);
		if (ctrl != null) {
			return ctrl.getCursor();
		}
		return new Cursor(Cursor.DEFAULT_CURSOR);
	}
*/
	/**
	 * 调整控制块的位置属性，如果本图形形状改变是，需要使用
	 * 比如，有形状'\'转换成'/'，那么原先控制块的属性就发生变化
	 */
	void adjustContrlRectPosi() {
		if((getControlRect1()==null)||(getControlRect2()==null)){
			return;
		}
		/*if (controlRect1.getCenter().getX()
			== controlRect2.getCenter().getX()) {
			controlRect1.setPosition(ControlRect.TOP_POSITION);
			controlRect2.setPosition(ControlRect.BOTTOM_POSITION);
			return;
		}*/
		/*
		if (controlRect1.getCenter().getY()
			== controlRect2.getCenter().getY()) {
			controlRect1.setPosition(ControlRect.LEFT_POSITION);
			controlRect2.setPosition(ControlRect.RIGHT_POSITION);
			return;
		}*/
		//如果块1在左边
		if (controlRect1.getCenter().getX()
			< controlRect2.getCenter().getX()) {
			//如果块1在左面
			if (controlRect1.getCenter().getY()
				> controlRect2.getCenter().getY()) {
				controlRect1.setPosition(ControlRect.LEFT_BOTTOM_POSITION);
				//左下
				controlRect2.setPosition(ControlRect.RIGHT_TOP_POSITION);
			} else {
				controlRect1.setPosition(ControlRect.LEFT_TOP_POSITION); //左上
				controlRect2.setPosition(ControlRect.RIGHT_BOTTOM_POSITION);
			}
		} else {
			//		如果块1在右面
			if (controlRect1.getCenter().getY()
				> controlRect2.getCenter().getY()) {
				controlRect1.setPosition(ControlRect.RIGHT_BOTTOM_POSITION);
				//右下
				controlRect2.setPosition(ControlRect.LEFT_TOP_POSITION);
			} else {
				controlRect1.setPosition(ControlRect.RIGHT_TOP_POSITION); //右上
				controlRect2.setPosition(ControlRect.LEFT_BOTTOM_POSITION);
			}
		}
	}

}