I want to draw a polygon around a polyline. The polyline in my case is a Google Maps direction and I need to show a polygon around it within the Google Maps canvas.
First:
For offsetting I use the JavaScript Clipper Library. I have the following polyline (route): I make an offset polygon below using Clipper:
I have a working JS Bin example.
The code is:
<html>
<head>
<title>Javascript Clipper Library / Offset polyline</title>
<script src="clipper.js"></script>
<script>
function draw() {
var polygons = [[{"X":72,"Y":59.45},{"X":136,"Y":66},{"X":170,"Y":99},{"X":171,"Y":114},{"X":183,"Y":125},{"X":218,"Y":144},{"X":218,"Y":165},{"X":226,"Y":193},{"X":254,"Y":195},{"X":283,"Y":195},{"X":292,"Y":202},{"X":325,"Y":213},{"X":341,"Y":234},{"X":397,"Y":245},{"X":417,"Y":248}]];
var scale = 100;
reverse_copy(polygons);
polygons = scaleup(polygons, scale);
var cpr = new ClipperLib.Clipper();
var delta = 25;
var joinType = ClipperLib.JoinType.jtRound;
var miterLimit = 2;
var AutoFix = true;
var svg, offsetted_polygon,
cont = document.getElementById('svgcontainer');
offsetted_polygon = cpr.OffsetPolygons(polygons, delta * scale, joinType, miterLimit, AutoFix);
//console.log(JSON.stringify(offsetted_polygon));
// Draw red offset polygon
svg = '<svg style="margin-top:10px;margin-right:10px;margin-bottom:10px;background-color:#dddddd" width="540" height="340">';
svg += '<path stroke="red" fill="red" stroke-width="2" stroke-opacity="0.6" fill-opacity="0.2" d="' + polys2path(offsetted_polygon, scale) + '"/>';
//Draw blue polyline
svg += '<path stroke="blue" stroke-width="3" d="' + polys2path(polygons, scale) + '"/>';
svg += '</svg>';
cont.innerHTML += svg;
}
// helper function to scale up polygon coordinates
function scaleup(poly, scale) {
var i, j;
if (!scale)
scale = 1;
for(i = 0; i < poly.length; i++) {
for(j = 0; j < poly[i].length; j++) {
poly[i][j].X *= scale;
poly[i][j].Y *= scale;
}
}
return poly;
}
// converts polygons to SVG path string
function polys2path (poly, scale) {
var path = "", i, j;
if (!scale)
scale = 1;
for(i = 0; i < poly.length; i++) {
for(j = 0; j < poly[i].length; j++) {
if (!j)
path += "M";
else
path += "L";
path += (poly[i][j].X / scale) + ", " + (poly[i][j].Y / scale);
}
path += "Z";
}
return path;
}
function reverse_copy(poly) {
// Make reverse copy of polygons = convert polyline to a 'flat' polygon ...
var k, klen = poly.length, len, j;
for (k = 0; k < klen; k++) {
len = poly[k].length;
poly[k].length = len * 2 - 2;
for (j = 1; j <= len - 2; j++) {
poly[k][len - 1 + j] = {
X: poly[k][len - 1 - j].X,
Y: poly[k][len - 1 - j].Y
}
}
}
}
</script>
</head>
<body onload="draw()">
<h2>Javascript Clipper Library / Offset polyline</h2>
This page shows an example of offsetting polyline and drawing it using SVG.
<div id="svgcontainer"></div>
</body>
</html>
And all this is good but now I must replace the polygon variables with points from Google Maps directions, so I do this change:
directionsService.route(request, function(response, status) {
if (status == google.maps.DirectionsStatus.OK) {
directionsDisplay.setDirections(response);
function draw() {
var polygons = response.routes[0].overview_path;
//REST OF CODE
}
}
}
I have a JS Bin example with this code for offsetting the polygon around the polyline.
But there is some problem, which I can't regonize and I can't get a polygon around directions.
Is there any way to solve this problem?
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