javascript html5 canvas实现可拖动省份的中国地图_javascript技巧

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){ //拖动整个地图，存在问题，地图画的太慢 
   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; 
});