Originally Posted by jdrescher

I use a single layer. This is the place where the layer is created:

Code:

//Start new trackline here
//Create fresh temp line array
vLineArray = [];
//Write first coordinate of new track segment to line array
vLineArray.push(coordinate);
//Save that to global array
vTrackLinePoints = vLineArray;

sTrackLine = "lineTrack" + iPausePositionsIndex.toString();

//We have to create a track line here.
map.addSourceLine(sTrackLine, vTrackLinePoints)
map.addLayer("layerTrack" + iPausePositionsIndex.toString(), { "type": "line", "source": sTrackLine })
map.setLayoutProperty("layerTrack" + iPausePositionsIndex.toString(), "line-join", "round");
map.setLayoutProperty("layerTrack" + iPausePositionsIndex.toString(), "line-cap", "round");
map.setPaintProperty("layerTrack" + iPausePositionsIndex.toString(), "line-color", "red");
map.setPaintProperty("layerTrack" + iPausePositionsIndex.toString(), "line-width", 2.0);

Then every new coordinate is pushed to the array vTrackLinePoints. And then I use

Code:

updateSourceLine

to redraw the track line:

Code:

//Create temp line array and set current points array to it. Must use a JS array here necause QML arrays don't allow for push!
vLineArray = vTrackLinePoints;
//Write first coordinate to line array
vLineArray.push(coordinate);
//Save that to global array
vTrackLinePoints = vLineArray;

map.updateSourceLine(sTrackLine, vTrackLinePoints);