mapwindow.java

java+mapxtreme 开发校园房管系统

package com.oyc.mapxtreme.applet;

import java.awt.Cursor;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import java.awt.event.MouseMotionListener;

/**
 * 显示地图的画布
 * @author 三峡大学理学院 欧阳超
 *
 */
public class MapWindow extends MapCanvas implements MouseListener, MouseMotionListener {
	
	//地图servlet路径
	private String m_servletName = null;
	
	//工具参数: 放大,缩小,平移,测距离,信息访问,范围查询
	private int m_tool = 0;
	private final int ZOOM_IN_TOOL = 1;
	private final int ZOOM_OUT_TOOL = 2;
	private final int PAN_TOOL = 3;
	private final int DISTANCE_TOOL = 4;
	private final int INFO_TOOL = 5;
	private final int SEARCH_INRADIUS_TOOL = 6;
	
	//鼠标拖动起点,终点,拖动宽度,高度
	private int dragX1, dragY1, dragX2, dragY2, dragWidth, dragHeight;
	
	//鼠标某次移动的坐标
	private int moveX1, moveY1, moveX2, moveY2;

	//标记当前鼠标是否在拖动
	private boolean m_Dragged = false;
	//标记当前鼠标是否单击过
	private boolean m_Clicked = false;
	
	//url变量,每次请求地图servlet时,重新给它赋值
	private String url = null;
	
	//视野变量
	private double zoom;
	
	//测距:总距离,测量次数
	private int totalDis = 0;
	private int disNum = 0;
	
	/**
	 * 构造器
	 * @param applet
	 * @param width  地图宽度
	 * @param height 地图高度
	 */
	public MapWindow(MainApplet applet, String servletName, int width, int height){
		super(applet, width, height);
		this.m_servletName = servletName;
		
		//注册监听器
		this.addMouseListener(this);
		this.addMouseMotionListener(this);
	}
	
	/**
	 * 设置当前命令工具
	 * @param tool
	 */
	public void setCommandTool(int tool){
		this.m_tool = tool;
	}

	public void mouseEntered(MouseEvent e) {
		// TODO Auto-generated method stub
		if (m_tool==ZOOM_IN_TOOL || m_tool==ZOOM_OUT_TOOL || m_tool==DISTANCE_TOOL || m_tool==SEARCH_INRADIUS_TOOL) {
			this.setCursor(new Cursor(Cursor.CROSSHAIR_CURSOR));
		} else if (m_tool == PAN_TOOL) {
			this.setCursor(new Cursor(Cursor.MOVE_CURSOR));
		} else if (m_tool == INFO_TOOL) {
			this.setCursor(new Cursor(Cursor.HAND_CURSOR));
		}
	}

	public void mouseExited(MouseEvent e) {
		// TODO Auto-generated method stub
		this.setCursor(new Cursor(Cursor.DEFAULT_CURSOR));
		super.clear();  //更新画布,去掉标签
		super.repaint();
	}

	public void mousePressed(MouseEvent e) {
		// TODO Auto-generated method stub
		if (this.m_tool == 0) { // 如果没有选择工具,则不处理
			return;
		}
		this.m_Dragged = false;
		this.dragX1 = e.getX();
		this.dragY1 = e.getY();
	}

	public void mouseReleased(MouseEvent e) {
		// TODO Auto-generated method stub
		if (this.m_tool == 0) { //如果没有选择工具,则不处理
			return;
		}
		
		//放大地图
		if(this.m_tool == ZOOM_IN_TOOL){
			if(this.m_Dragged){ //拖动放大
				//计算区域中心坐标
				int a = dragX1 + dragWidth / 2;
				int b = dragY1 + dragHeight / 2;
				
				if(Math.abs(dragWidth) > Math.abs(dragHeight)){
					zoom = Math.abs(dragWidth) * MapState.getCurZoom() / super.width;
				}else{
					zoom = Math.abs(dragHeight) * MapState.getCurZoom() / super.height;
				}
				url = m_servletName + "?method=zoom";
				url += "&ptx=" + a;
				url += "&pty=" + b;
				url += "&zoom=" + zoom;
				this.applet.adjustMapBySelf(url);
				
			}else{  //单击放大
				zoom = MapState.getCurZoom() / 2.0;
				url = m_servletName + "?method=zoom";
				url += "&ptx=" + dragX1;
				url += "&pty=" + dragY1;
				url += "&zoom=" + zoom;
				this.applet.adjustMapBySelf(url);
			}
			this.m_Dragged = false; //更改拖动标识状态
			MapState.setCurZoom(zoom);  //更新地图状态
		}
		
		//缩小地图
		if(this.m_tool == ZOOM_OUT_TOOL){
			if(this.m_Dragged){ //拖动缩小
				//计算区域中心坐标
				int a = dragX1 + dragWidth / 2;
				int b = dragY1 + dragHeight / 2;
				
				if(Math.abs(dragWidth) > Math.abs(dragHeight)){
					zoom = super.height * MapState.getCurZoom() / Math.abs(dragHeight);
				}else{
					zoom = super.width * MapState.getCurZoom() / Math.abs(dragWidth);
				}
				url = m_servletName + "?method=zoom";
				url += "&ptx=" + a;
				url += "&pty=" + b;
				url += "&zoom=" + zoom;
				this.applet.adjustMapBySelf(url);
				
			}else{  //单击缩小
				zoom = MapState.getCurZoom() * 2.0;
				url = m_servletName + "?method=zoom";
				url += "&ptx=" + dragX1;
				url += "&pty=" + dragY1;
				url += "&zoom=" + zoom;
				this.applet.adjustMapBySelf(url);
			}
			this.m_Dragged = false; //更改拖动标识状态
			MapState.setCurZoom(zoom);  //更新地图状态
		}
		
		//平移地图
		if (this.m_tool == PAN_TOOL){
			if (this.m_Dragged){ //拖动平移
				//计算请求的中心坐标
				int a = width/2 - dragWidth;
				int b = height/2 - dragHeight;
				
				url = m_servletName + "?method=pan";
				url += "&ptx=" + a;
				url += "&pty=" + b;
				this.applet.adjustMapBySelf(url);
				
				this.m_Dragged = false; //更改拖动标识状态
			}
		}
		
		//范围查询
		if(this.m_tool == SEARCH_INRADIUS_TOOL){
			//计算半径
			int w = Math.abs(dragWidth);
			int h = Math.abs(dragHeight);
			int radius = (int)Math.sqrt(w*w + h*h);
			this.applet.invokeJavascript("searchInRadius("+dragX1+","+dragY1+","+radius+")");
		}
	}

	public void mouseDragged(MouseEvent e) {
		// TODO Auto-generated method stub
		if (this.m_tool == 0) { //如果没有选择工具,则不处理
			return;
		}
		this.m_Dragged = true; //标识当前鼠标在拖动
		
		//当前坐标及拖动的距离
		dragX2 = e.getX();
		dragY2 = e.getY();
		dragWidth = dragX2 - dragX1;
		dragHeight = dragY2 - dragY1;
		
		//放大或缩小
		if(this.m_tool == ZOOM_IN_TOOL || this.m_tool == ZOOM_OUT_TOOL){
			if(dragHeight >= 0){ //正拖鼠标
				if(this.m_tool == ZOOM_IN_TOOL){
					super.drawRect(dragX1, dragY1, dragWidth, dragHeight);
				}else{
					super.drawRect(dragX1, dragY1, dragWidth, dragHeight);
				}
			}else{ //反拖鼠标
				if(this.m_tool == ZOOM_IN_TOOL){
					super.drawRect(dragX2, dragY2, Math.abs(dragWidth), Math.abs(dragHeight));
				}else{
					super.drawRect(dragX2, dragY2, Math.abs(dragWidth), Math.abs(dragHeight));
				}
			}
		}
		
		//平移
		if(this.m_tool == PAN_TOOL){
			super.panMap(dragWidth, dragHeight);
		}
		
		//综合查询,画圆
		if(this.m_tool == SEARCH_INRADIUS_TOOL){
			int w = Math.abs(dragWidth);
			int h = Math.abs(dragHeight);
			int radius = (int)Math.sqrt(w*w + h*h);
			super.drawOval(dragX1-radius, dragY1-radius, radius);
		}
	}
	
	public void mouseClicked(MouseEvent e) {
		// TODO Auto-generated method stub
		if(this.m_tool==DISTANCE_TOOL){  //测距
			if(e.getClickCount() == 2){  //双击时,结束画直线
				this.m_Clicked = false;
				this.disNum = 0;
				this.totalDis = 0;
				super.clear();
				return ;
			}
			if(this.m_Clicked){  //已经单击过,画直线
				super.drawLine(moveX1, moveY1, moveX2, moveY2, true, true, "测距量", 44, 18);
				this.disNum ++;
				this.countDistance(moveX1, moveY1, moveX2, moveY2);
			}else{  //第一次单击
				this.m_Clicked = true;
			}
		}
		//当前坐标
		moveX1 = e.getX();
		moveY1 = e.getY();
		
		if(this.m_tool == INFO_TOOL){  //信息访问
			this.applet.invokeJavascript("showInfo("+ moveX1 +","+ moveY1 +")");
		}
	}

	public void mouseMoved(MouseEvent e) {
		// TODO Auto-generated method stub
		//当前坐标
		moveX2 = e.getX();
		moveY2 = e.getY();
		
		//在鼠标旁边画一个标签,显示当前状态
		if(this.m_tool == ZOOM_IN_TOOL){
			super.drawLabel(moveX2, moveY2, 35, 18, "放大");
		}
		if(this.m_tool == ZOOM_OUT_TOOL){
			super.drawLabel(moveX2, moveY2, 35, 18, "缩小");
		}
		if(this.m_tool == DISTANCE_TOOL){
			super.drawLabel(moveX2, moveY2, 44, 18, "测距离");
		}
		if(this.m_tool == SEARCH_INRADIUS_TOOL){
			super.drawLabel(moveX2, moveY2, 58, 18, "范围查找");
		}
		
		//测距,画直线
		if(this.m_tool==DISTANCE_TOOL && this.m_Clicked){
			super.drawLine(moveX1, moveY1, moveX2, moveY2, true, false, "测距量", 44, 18);
		}
	}
	
	/**
	 * 测距离
	 * @param x1
	 * @param y1
	 * @param x2
	 * @param y2
	 */
	private void countDistance(int x1, int y1, int x2, int y2){
		int a = Math.abs(x2 - x1);
		int b = Math.abs(y2 - y1);
		double c = Math.sqrt(a*a + b*b);
		int curDis = (int) ((MapState.getCurZoom() * c / super.width) * 1000);
		this.totalDis += curDis;
		this.applet.invokeJavascript("countDistance("+ this.disNum +","+ curDis +","+ this.totalDis +")");
	}

}