javascript - 创建正确的导航路径

Question

我必须为船只创建导航路径。所有的船只都来到一个中心点并在那里停了一会儿。 船只坐标和中心点(MotherShip)来自数据库。

选择数据的代码。中心点是静止的。

<?php
    $sqlqry = "SELECT * FROM ship WHERE id=" . $id . " AND start_date BETWEEN '" . $s_date . "' AND '" . $e_date . "'";
    $result = mysqli_query($bd, $sqlqry);
    $locations = array();
    $counter=0;
    while($row = mysqli_fetch_array($result)) {
        array_push($locations, $row);
    }
    $nrows = mysqli_num_rows($result);
?>

问题是有些船是从水中的中心点开始的。它们应该在陆地上开始和结束。

Like here you can see one ship at the start of red line(land) and one at the start of green line (in water where center point is).

这是我用于初始化部分的 google maps JavaScript 部分。

var nrows = <?php echo json_encode($nrows,JSON_NUMERIC_CHECK);?>;
    var locMatrix = <?php echo json_encode($locations,JSON_NUMERIC_CHECK);?>;
    var m_ship_rows = <?php echo json_encode($m_ship_rows,JSON_NUMERIC_CHECK);?>;
    var m_ship = <?php echo json_encode($m_ship,JSON_NUMERIC_CHECK);?>;

      var line;
      var line1;
      var lineArray = [];
      var lineArray1 = [];
      var DrivePath = [];
      // This example adds an animated symbol to a polyline.

      function initMap() {

        var intervalForAnimation;
        var count = 0;
        var n = 2;
        for(var i=0;i<=nrows-1;i++)
        {
        console.log(DrivePath[i]);
        DrivePath.push(new google.maps.LatLng(locMatrix[i][1], locMatrix[i][2]),
                  new google.maps.LatLng(17.8674, 66.543),
                  new google.maps.LatLng(locMatrix[i][3], locMatrix[i][4]));
      }
        var Colors = [
        "#FF0000", 
        "#00FF00", 
        "#0000FF", 
        "#FFFFFF", 
        "#000000", 
        "#FFFF00", 
        "#00FFFF", 
        "#FF00FF"
        ];

整个代码在JSFiddle .

您也可以访问我的 github 存储库以获取完整代码。

http://github.com/Tejas-Nanaware/ship-scheduling-and-animation-tool

Answer 1

好吧，我找到了一个不同的解决方案，这在一定程度上帮助了我。

// Create the polyline and add the symbol to it via the 'icons' property.
        for(var i=0; i <=nrows; i++)
        {
          var line = new google.maps.Polyline({
            path: [{lat: locMatrix[i][1], lng: locMatrix[i][2]},
            {lat: 17.8674, lng: 66.543},
            {lat: locMatrix[i][3], lng: locMatrix[i][4]}],
            icons: [{
              icon: lineSymbol,
              offset: '100%'
          }],
          strokeColor: '#000000',
          strokeOpacity: 1.0,
          map: map
      });
          animateCircle(line);
      }

animateCircle() 函数:

function animateCircle(line) {
          var count = 0;
          window.setInterval(function() {
            count = (count+0.5) % 200;
            var icons = line.get('icons');
            icons[0].offset = (count / 2) + '%';
            line.set('icons', icons);
        }, 20);
      }