Question

希望实现一个地图，该地图将缩放到显示多个标记和用户当前位置的特定位置。

地图以（0,0）为中心，没有标记。已经搜索了几个小时的答案 - 已经连续两天试过!!

请感谢任何反馈！

SupportMapFragmentActivity.java

<!DOCTYPE html>
<meta charset="utf-8">
<body>
<script src="https://d3js.org/d3.v3.min.js" charset="utf-8"></script>
<script>

var file = "https://gist.githubusercontent.com/mbostock/1044242/raw/8f22cf2264e1f6ec6cb233c4b49333fb8f75bb99/readme-flare-imports.json",
    fileinternet = "https://gist.githubusercontent.com/mbostock/1044242/raw/8f22cf2264e1f6ec6cb233c4b49333fb8f75bb99/readme-flare-imports.json",
    fileregular = "data.json",
    isLineActive = false,
    //originally 0.85
    tension = 0.85,
    //originally 960
    diameter = 900,
    radius = diameter / 2,
    innerRadius = radius - 120;

var cluster = d3.layout.cluster()
    .size([360, innerRadius])
    .sort(null)
    .value(function(d) { return d.size; });

var bundle = d3.layout.bundle();

var line = d3.svg.line.radial()
    .interpolate("bundle")
    .tension(tension)
    .radius(function(d) { return d.y; })
    .angle(function(d) { return d.x / 180 * Math.PI; });

var svg = d3.select("body").append("svg")
    .attr("width", diameter*1.5)
    .attr("height", diameter)
    .attr("style", "outline: thin solid grey;")
    .call(d3.behavior.zoom().on("zoom", function () {
        svg.attr("transform", "translate(" + d3.event.translate[0] + "," + d3.event.translate[1] + ")" + " scale(" + d3.event.scale + ")")
      }))
  .append("g")
    /*.attr("transform", "translate(" + radius*1.5 + "," + radius + ")")*/;

var link = svg.append("g").selectAll(".link"),
    node = svg.append("g").selectAll(".node");

d3.json(file, function(error, classes) {
  if (error) throw error;

  var nodes = cluster.nodes(packageHierarchy(classes)),
      links = packageImports(nodes);

  link = link
      .data(bundle(links))
    .enter().append("path")
      .each(function(d) { d.source = d[0], d.target = d[d.length - 1]; })
      .attr("class", "link")
      .attr("d", line)
      //added the transform here to center the links
      .attr("transform", "translate(" + radius*1.5 + "," + radius + ")");

  node = node
      .data(nodes.filter(function(n) { return !n.children; }))
      .attr("transform", "translate(" + radius*1.5 + "," + radius + ")")
    .enter().append("text")
      .attr("class", "node")
      .attr("dy", ".31em") 
      //I suppose this is where I need to change the transform to somehow center the nodes, but keep the way it's generated   
      .attr("transform", function(d) { return "rotate(" + (d.x - 90) + ")translate(" + (d.y + 8) + ",0)" + (d.x < 180 ? "" : "rotate(180)"); })
      .style("text-anchor", function(d) { return d.x < 180 ? "start" : "end"; })
      .text(function(d) { return d.key; })
      .on("click", mouseovered);
});

function mouseovered(d) {
  if (isLineActive) {
    link
      .classed("link--target", false)
      .classed("link--source", false);

    node
      .classed("node--target", false)
      .classed("node--source", false);
    isLineActive = false;
  }
  else {
    node
      .each(function(n) { n.target = n.source = false; });

    link
      .classed("link--target", function(l) { if (l.target === d) return l.source.source = true; })
      .classed("link--source", function(l) { if (l.source === d) return l.target.target = true; })
      .filter(function(l) { return l.target === d || l.source === d; })
      .each(function() { this.parentNode.appendChild(this); });

    node
      .classed("node--target", function(n) { return n.target; })
      .classed("node--source", function(n) { return n.source; });
  }

}

function mouseouted(d) {
  link
      .classed("link--target", false)
      .classed("link--source", false);

  node
      .classed("node--target", false)
      .classed("node--source", false);
}

d3.select(self.frameElement).style("height", diameter + "px");

function packageHierarchy(classes) {
  var map = {};

  function find(name, data) {
    var node = map[name], i;
    if (!node) {
      node = map[name] = data || {name: name, children: []};
      if (name.length) {
        node.parent = find(name.substring(0, i = name.lastIndexOf(".")));
        node.parent.children.push(node);
        node.key = name.substring(i + 1);
      }
    }
    return node;
  }

  classes.forEach(function(d) {
    find(d.name, d);
  });

  return map[""];
}

function packageImports(nodes) {
  var map = {},
      imports = [];

  // Compute a map from name to node.
  nodes.forEach(function(d) {
    map[d.name] = d;
  });

  nodes.forEach(function(d) {
    if (d.imports) d.imports.forEach(function(i) {
      imports.push({source: map[d.name], target: map[i]});
    });
  });

  return imports;
}

</script>
</body>

Answer 1

您可以在此SO question尝试解决方案，因为您都试图在旧金山展示标记。

解决方案是将经度更改为负（ - ）坐标。因为西侧的经度被指示为负号。

还有关于位置服务的问题。我认为tutorial可以帮助您了解应用程序如何显示您当前的位置。

Google地图显示在默认位置（0,0）标记处，而当前位置未显示

1 个答案: