javascript html5 canvas实现可拖动省份的中国地图

var myGeo = new BMap.Geocoder();  (function(){  for(var i = 0;i < allZoneData.length;i++){   getAllZone(allZoneData[i].name,allZoneData[i].been,allZoneData[i].id);  } })(); //name为省份名，been表示是否去过，id为唯一标识，cir为省份圈号（有可能一个省份有两部分封闭圆圈构成） function getAllZone (name,been,id) {  var data,temp;           var bdary = new BMap.Boundary();  bdary.get(name, function(rs){   var count = rs.boundaries.length;    for(var j = 0; j < count; j++){         var ply = new BMap.Polygon(rs.boundaries[j], {strokeWeight: 2, strokeColor: "#ff0000"});    data = ply.getPath();    $.ajax({     url: "addData.php",     type:"POST",     data: {'data':data,'name' : name,'cir':j,'been':been,'id':id},     success: function(txt){      console.log(txt);     },     error: function(){      alert('添加数据出错！');     }    });     }          });         } 

<?php   header("content-type:text/html; charset=utf-8");   $data = $_REQUEST['data'];   $name = $_REQUEST['name'];   $cir = $_REQUEST['cir'];   $been = $_REQUEST['been'];   $id = $_REQUEST['id'];    $con = mysql_connect("localhost","……","……");   if (!$con){     die('Could not connect: ' . mysql_error());   }   mysql_select_db("……", $con);   mysql_set_charset('utf8',$con);    foreach ($data as $temp){     $sql = "insert into place (id,name,lng,lat,cir,been) values ('".$id."', '".$name."', '".$temp['lng']."','".$temp['lat']."','".$cir."','".$been."')";     if (!mysql_query($sql,$con)){       die('Error: ' . mysql_error());     }   }    mysql_close($con);   echo 'Success'; ?> 

var drawMap = function (context,data,l,t) { //context为绘制所在的层,l和t为相对位置,data为边界对象数组  if(data.been == 'yes'){   context.fillStyle = "green";  }else{   context.fillStyle = "grey";  }  context.globalAlpha = 0.8;  context.beginPath();  cleft = (data.coordinate[0].lng - temp_left) * bigger + l; //temp_left和temp_top为地图偏移位置.  ctop = (temp_top - data.coordinate[0].lat) * bigger + t; //bigger为放大倍数   context.moveTo(cleft,ctop);             for(var j = 1;j < data.coordinate.length;j++){   cleft = (data.coordinate[j].lng - temp_left) * bigger + l;   ctop = (temp_top - data.coordinate[j].lat) * bigger + t;   context.lineTo(cleft,ctop);  }             context.closePath();  context.stroke();  context.fill(); } 

var drawLinkLine = function(data,l,t){ //此处的l和t表示移动的相对位置  for(var k = 0;k < data.coordinate.length;k++){   if(k % 60 == 0){    moveMapContext.beginPath();               //根据移动距离的不同，设置连线的粗细    lineLength = Math.sqrt(l * l + t * t) / 100;    lineLength = lineLength >= 4.5 ? 4.5 : lineLength;    moveMapContext.lineWidth = 5 - lineLength;     moveMapContext.strokeStyle = "rgba(0,120,60,0.4)";    cleft = (data.coordinate[k].lng - temp_left) * bigger;    ctop = (temp_top - data.coordinate[k].lat) * bigger;    moveMapContext.moveTo(cleft,ctop);     cleft = (data.coordinate[k].lng - temp_left) * bigger + l;    ctop = (temp_top - data.coordinate[k].lat) * bigger + t;    moveMapContext.lineTo(cleft,ctop);    moveMapContext.closePath();    moveMapontext.stroke();   }  } } 

$('#eventCanvas').mousedown(function(ev){  //获取点击canvas的坐标  var mouseX, mouseY;  if(ev.layerX || ev.layerX==0){   mouseX = ev.layerX;   mouseY = ev.layerY;  }else if(ev.offsetX || ev.offsetX==0){   mouseX = ev.offsetX;   mouseY = ev.offsetY;  }   //保存点击时的原坐标值  tempX = mouseX;  tempY = mouseY;   //将坐标转化为经纬度  mouseX = mouseX/bigger + temp_left;  mouseY = temp_top - mouseY/bigger;   if(opts.dragAll){   draging = true;  }else{   moveMapContext.clearRect(0, 0, 1100, 630);   //根据经纬度获得所在地理位置并获取边界坐标再画线   myGeo.getLocation(new BMap.Point(mouseX, mouseY),    function(result){     tempName = '';     draging = true;     name = result.addressComponents.province;     tempName = name;     pubFuns.drawMoveLayerLine(0,0);      });  } }); 

$('#eventCanvas').mousemove(function(ev){  var mouseX, mouseY;  if(ev.layerX || ev.layerX==0){   mouseX = ev.layerX;   mouseY = ev.layerY;  }else if(ev.offsetX || ev.offsetX==0){   mouseX = ev.offsetX;   mouseY = ev.offsetY;  }  if(draging){   if(opts.dragAll){ <span style="font-family: Arial, Helvetica, sans-serif;">//拖动整个地图，存在问题，地图画的太慢</span>    mapContext.clearRect(0, 0, 1100, 630);    for(var i = 0;i < allZoneData.length;i++){     for(var j = 0;j < allData[allZoneData[i].name].length;j++){ //allData是第一次读取数据时放到内存里的变量，它包含了所有数据      pubFuns.drawMap(mapContext,allData[allZoneData[i].name][j],mouseX - tempX, mouseY - tempY);     }    }    }else{     moveMapContext.clearRect(0, 0, 1100, 630);     pubFuns.drawMoveLayerLine(mouseX - tempX, mouseY - tempY);    }    } }); 

$('#eventCanvas').mouseup(function(e){  if(opts.dragAll){   }else{   moveMapContext.clearRect(0, 0, 1100, 630);  }  draging = false; });