multiresizecontrolfigure.java

java实现的版画图程序

package drawfigure;

import java.awt.*;
import java.awt.geom.*;
/**
 * 拥有8个改变图形大小控制器的图形类,子类有RectangleFigure,OvalFigure等，拥有8个控制块
 * SelectFigure也是本类的字类，因为选择区域是矩形
 */
public abstract class MultiResizeControlFigure extends Figure{

  /**
   * 控制块
   */
  private ControlRect ctrlRectN,ctrlRectS,ctrlRectW,ctrlRectE;
  private ControlRect ctrlRectNW,ctrlRectNE,ctrlRectSW,ctrlRectSE;
  
  public MultiResizeControlFigure(){
    super();
  }
  public MultiResizeControlFigure(Point2D p){
    super(p);
  }
  
  public void setStartPoint(Point2D p){
    super.setStartPoint(p);
    if((getStartPoint()!=null)&&(getEndPoint()!=null)){
      setCtrlRectsByBounds(getBounds());
    }
  }
  public void setEndPoint(Point2D p){
    super.setEndPoint(p);
    if((getStartPoint()!=null)&&(getEndPoint()!=null)){
      setCtrlRectsByBounds(getBounds());
    }
  }
  
  /**
   *通过边界线确定控制块
   */
  public void setCtrlRectsByBounds(Rectangle2D bound){
    double x1,y1,x2,y2,width,height;
    x1=bound.getX();
    y1=bound.getY();
    width=bound.getWidth();
    height=bound.getHeight();
    x2=x1+width;
    y2=y1+height;
    
    ctrlRectN=new ControlRect(x1+width/2,y1,ControlRect.TOP_POSITION);
    ctrlRectS=new ControlRect(x1+width/2,y2,ControlRect.BOTTOM_POSITION);
    ctrlRectW=new ControlRect(x1,y1+height/2,ControlRect.LEFT_POSITION);
    ctrlRectE=new ControlRect(x2,y1+height/2,ControlRect.RIGHT_POSITION);
    ctrlRectNW=new ControlRect(x1,y1,ControlRect.LEFT_TOP_POSITION);
    ctrlRectNE=new ControlRect(x2,y1,ControlRect.RIGHT_TOP_POSITION);
    ctrlRectSW=new ControlRect(x1,y2,ControlRect.LEFT_BOTTOM_POSITION);
    ctrlRectSE=new ControlRect(x2,y2,ControlRect.RIGHT_BOTTOM_POSITION);
  }
  
  /*
   *  (non-Javadoc)
   * @see drawfigure.Figure#pointInside(java.awt.Point)
   */
  public abstract boolean pointInside(Point2D p);
  
  /*
   *  (non-Javadoc)
   * @see drawfigure.Figure#pointInResizeControl(java.awt.Point2D)
   */
  public ControlRect getControlRect(Point2D p){
	if(ctrlRectN.pointInside(p))return ctrlRectN;
	if(ctrlRectS.pointInside(p))return ctrlRectS;
	if(ctrlRectW.pointInside(p))return ctrlRectW;
	if(ctrlRectE.pointInside(p))return ctrlRectE;
	if(ctrlRectNW.pointInside(p))return ctrlRectNW;
	if(ctrlRectNE.pointInside(p))return ctrlRectNE;
	if(ctrlRectSW.pointInside(p))return ctrlRectSW;
	if(ctrlRectSE.pointInside(p))return ctrlRectSE;
    return null;
  }
  
  public boolean pointInControlRect(Point2D p){
    if(getControlRect(p)!=null)return true;
    return false;
  }
  /**
   * 根据点坐标在哪个选择块中，得到改变大小的光标类型 
   */
  public abstract void draw(Graphics g);
 
 
  public void drawCtrlRects(Graphics g){
  	ctrlRectN.paint(g);
	ctrlRectS.paint(g);
	ctrlRectW.paint(g);
	ctrlRectE.paint(g);
	ctrlRectNW.paint(g);
	ctrlRectNE.paint(g);
	ctrlRectSW.paint(g);
	ctrlRectSE.paint(g);
  }
  
  /*
   *  (non-Javadoc)
   * @see drawfigure.Figure#getCursor(java.awt.Point)
   */
/*  public Cursor getCursor(Point2D p){
  	ControlRect ctrl=getControlRect(p);
  	if(ctrl!=null){
  	  return ctrl.getCursor();
  	}
  	return new Cursor(Cursor.DEFAULT_CURSOR);
  }
 */ 
}