package?com.test;

import?java.awt.Cursor;
import?java.awt.Graphics;
import?java.awt.Graphics2D;
import?java.awt.Rectangle;
import?java.awt.event.MouseAdapter;
import?java.awt.event.MouseEvent;
import?java.awt.event.MouseMotionListener;
import?java.awt.geom.Point2D;
import?java.util.ArrayList;

import?javax.swing.JComponent;
import?javax.swing.Jframe;
import?javax.swing.JPanel;

public?class?MouseComponent?extends?JComponent?implements?MouseMotionListener?{
????private?Rectangle?rect;
????private?boolean?isTopLeft;
????private?boolean?isTop;
????private?boolean?isTopRight;
????private?boolean?isRight;
????private?boolean?isBottomRight;
????private?boolean?isBottom;
????private?boolean?isBottomLeft;
????private?boolean?isDrag;
????private?boolean?isLeft;
????//矩形最小寬和高為多少
????private?final?static?int?RESIZE_WIDTH?=?5;
????private?final?static?int?MIN_WIDTH?=?20;
????private?final?static?int?MIN_HEIGHT?=?20;
????
????
????private?static?final?int?SIDELENGTH?=?50;//單擊增加的矩形大小
????private?ArrayList?squares;//所有的矩形
????private?Rectangle?current;
????public?MouseComponent（）?{
????????this.squares?=?new?ArrayList（）;
????????this.rect?=?null;
????????addMouseMotionListener（this）;
????????this.addMouseListener（new?MouseHandle（））;//?監(jiān)聽鼠標(biāo)點(diǎn)擊事件
????????//this.addMouseMotionListener（new?MouseMotionHandler（））;//?監(jiān)聽鼠標(biāo)移動事件
????}

????//?如果鼠標(biāo)單擊屏幕的地方有矩形則不繪制矩形
????public?Rectangle?find（Point2D?p）?{
????????for?（Rectangle?r?:?squares）?{
????????????if?（r.contains（p））
????????????????return?r;
????????}
????????return?null;
????}

????//?繪制矩形
????public?void?paintComponent（Graphics?g）?{
????????Graphics2D?g2?=?（Graphics2D）?g;
????????for?（Rectangle?r?:?squares）?{
????????????g2.draw（r）;
????????}
????}

????//?添加矩形到屏幕
????public?void?add（Point2D?p）?{
????????double?x?=?p.getX（）;
????????double?y?=?p.getY（）;
????????rect?=?new?Rectangle（（int）?（x?-?SIDELENGTH?/?2）?（int）?（y?-?SIDELENGTH?/?2）?SIDELENGTH?SIDELENGTH）;
????????squares.add（rect）;
????????repaint（）;
????}

????//?刪除矩形
????public?void?remove（Rectangle?s）?{
????????if?（s?==?null）
????????????return;
????????if?（s?==?rect）
????????????rect?=?null;
????????squares.remove（s）;
????????repaint（）;
????}

????private?class?MouseHandle?extends?MouseAdapter?{

????????@Override
????????public?void?mouseClicked（MouseEvent?e）?{
????????????rect?=?find（e.getPoint（））;
????????????//?當(dāng)前位置如果有矩形，且點(diǎn)擊大于2次，則刪除矩形
????????????if?（rect?!=?null?&&?e.getClickCount（）?>=?2）
????????????????remove（rect）;
????????}

????????@Override
????????public?void?mousePressed（MouseEvent?e）?{
????????????rect?=?find（e.getPoint（））;
????????????//?當(dāng)前位置沒有矩形則繪制
????????????if?（rect?==?null）
????????????????add（e.getPoint（））;
????????}

????}

????private?class?MouseMotionHandler?implements?MouseMotionListener?{

????????@Override
????????public?void?mouseDragged（MouseEvent?e）?{
????????????//?如果當(dāng)前位置有矩形，進(jìn)行拖拽。
????????????if?（rect

?屬性????????????大小?????日期????時(shí)間???名稱
-----------?---------??----------?-----??----
?????文件????????8452??2019-05-28?12:17??MouseComponent.java