百度地图与HT for Web结合的GIS网络拓扑应用

var dataModel = new ht.DataModel();
var graphView = new ht.graph.GraphView(dataModel);              
var map = null;   

function init() {
    map = new BMap.Map("map");   
    var point = new BMap.Point(116.404, 39.915);                          
    map.addTileLayer(new BMap.TrafficLayer());                    
    map.centerAndZoom(point, 4);                    
    map.enableScrollWheelZoom();                       
    map.addControl(new BMap.NavigationControl());                               

    map.setMapStyle({
        features: ["road", "building","water","land"],
        style:'midnight'
    });

    var view = graphView.getView();
    view.className = 'graphView'; 
    var mapDiv = document.getElementById('map');
    mapDiv.firstChild.firstChild.appendChild(view);

    map.addEventListener('movestart', function(e){                   
       view.style.opacity = 0;
    });
    map.addEventListener('moveend', function(e){
       view.style.opacity = 1; 
       resetPosition(); 
    });
    map.addEventListener('dragstart', function(e){
       view.style.opacity = 0;                
    });
    map.addEventListener('dragend', function(e){
       view.style.opacity = 1; 
       resetPosition(); 
    });                                
    map.addEventListener('zoomstart', function(e){
        view.style.opacity = 0;
    });                
    map.addEventListener('zoomend', function(e){
        view.style.opacity = 1;    
        resetPosition(); 
    });                

    graphView.setLayers(['edgeLayer', 'nodeLayer']);
    graphView.enableFlow(60);
    graphView.enableToolTip();
    graphView.getToolTip = function(event){
        var data = this.getDataAt(event);
        if(data instanceof ht.Node){
            return '城市：' + data.s('note') + '
经度：' + data.lonLat.lng + '
维度：' + data.lonLat.lat;
        }
        return null;
    };
    graphView.isVisible = function(data){
        return map.getZoom() > 1 || this.isSelected(data);
    };
    graphView.isNoteVisible = function(data){
        return map.getZoom() > 8 || this.isSelected(data);
    }; 
    graphView.getLabel = function(data){
        if(data instanceof ht.Node){
            return '经度：' + data.lonLat.lng + '\n维度：' + data.lonLat.lat;
        }                    
    };
    graphView.isLabelVisible = function(data){
        return map.getZoom() > 9 || this.isSelected(data);
    }; 

    graphView.mi(function(e){
        if(e.kind === 'endMove'){
            graphView.sm().each(function(data){
                if(data instanceof ht.Node){
                   var position = data.getPosition(),
                       x = position.x + graphView.tx(),
                       y = position.y + graphView.ty();                             
                   data.lonLat = map.pixelToPoint(new BMap.Pixel(x,y)); 
                }                            
            });
        }
    });

    graphView.setAutoScrollZone(-1);
    graphView.handleScroll = function(){};
    graphView.handlePinch = function(){};

    var handleClick = function(e){
        var data = graphView.getDataAt(e);
        if(data){
            e.stopPropagation();
        }
        else if(e.metaKey || e.ctrlKey){
            e.stopPropagation();
        }
    };
    graphView.getView().addEventListener('click', handleClick, false);                
    graphView.getView().addEventListener('dblclick', handleClick, false);
    graphView.getView().addEventListener(ht.Default.isTouchable ? 'touchstart' : 'mousedown', handleClick, false);

    window.addEventListener("resize", function(e) {
        graphView.invalidate();
    }, false);                 

    var color = randomColor(),
        province = null;
    lines = china.split('\n');
    for(var i=0; i<lines.length; i++) {
        line = lines[i].trim();
        if(line.indexOf('【') === 0){               
            color = randomColor();
            province = null;
        }else{
            var ss = line.split(' ');
            if(ss.length === 3){
                var node = createNode(parseFloat(ss[1].substr(3)), parseFloat(ss[2].substr(3)), ss[0].substr(3), color); 
                if(province){
                    var edge = new ht.Edge(province, node);
                    edge.s({
                        'edge.center': true,
                        'edge.width': 1,                                    
                        'flow': true
                    });
                    edge.setLayer('edgeLayer');
                    dataModel.add(edge);
                }else{
                    province = node;
                    node.s({                                   
                        'shape.gradient': 'radial.center',                                    
                        'border.type': 'circle',
                        'border.width': 1,
                        'border.color': 'rgba(200, 200, 200, 0.5)'                                    
                    });
                    node.setSize(15, 15);
                }
            }
        }
    }                

}

function createNode(lon, lat, name, color){
    var node = new ht.Node();
    node.s({
        'shape': 'circle',
        'shape.background': color,
        'note': name,                    
        'label.background': 'rgba(255, 255, 0, 0.5)',                    
        'select.type': 'circle'
    });
    node.setLayer('nodeLayer');
    node.setSize(10, 10);
    var lonLat = new BMap.Point(lon, lat); 
    node.setPosition(map.pointToPixel(lonLat));
    node.lonLat = lonLat;
    graphView.dm().add(node);
    return node;
}            

function resetPosition(e){
    graphView.tx(0);
    graphView.ty(0);
    dataModel.each(function(data){
        if(data instanceof ht.Node){
            var lonLat = data.lonLat,
                position = map.pointToPixel(lonLat);   
            data.setPosition(position.x,position.y);                           
        }
    });            
}