借鉴地图V2多色折线 [英] Drawing multi color PolyLines on Maps V2
问题描述
我画我的地图上素色折线以下方式,和它的伟大工程:
I am drawing a plain color PolyLine on my map the following way, and it works great:
PolylineOptions polyLine = new PolylineOptions();
polyLine.width(5);
polyLine.color(Color.RED);
polyLine.geodesic(true);
for (int i = 0; i < speed.length; i++) {
polyLine.add(new LatLng(lat, lng));
}
map.addPolyline(polyLine);
现在我要画的不同点之间不同颜色的折线,这取决于这两个点之间的速度。
Now I would want to draw a polyline with different colors between different points, depending on the speed between those two points.
似乎有没有成为这样做的一个简单的方法。
There doesn't seem to be an easy way of doing it.
我指的是这样一个问题:绘制折线与不同颜色的V2地图,我可以添加多个 PolylineOptions
一个又一个,但我不认为这将是一个有效的方法,因为我在一个简单的数据集来绘制有2000多点。
I am referring to this question : draw polylines with different colors on v2 maps , and I can add multiple PolylineOptions
one after another, but I don't think that will be an efficient approach, given I have more than 2000 points in a simple data set to draw.
有没有更好的做法?
理想的实现将是怎样的Nike +应用程序绘制线条图:
The ideal implementation would be how Nike+ app draws lines on maps:
将大大AP preciate任何帮助。
Would greatly appreciate any help.
在此先感谢!
推荐答案
我刚找到一个方法来做到这一点与OptionsLines,其实2 OptionsLines。 我用这个函数与GPX文件,这就是为什么有LY的personnal对象TRKPT。
I just find a way to do that with OptionsLines, in fact, two OptionsLines. I use this function with a gpx file, that's why there ly personnal object TRKPT.
int size = listPoints.size();
PolylineOptions optline = new PolylineOptions();
PolylineOptions optline2 = new PolylineOptions();
optline.geodesic(true);
optline.width(10);
optline2.geodesic(true);
optline2.width(10);
for (int i = 0; i < size - 1; i++) {
TRKPT pointD = listPoints.get(i);
TRKPT pointA = listPoints.get(i + 1);
int green = (int) ((float) 255 - (float) (i / (float) size) * (float) 255);
int red = (int) ((float) 0 + (float) (i / (float) size) * (float) 255);
optline.add(new LatLng(pointD.getLat(), pointD.getLon()), new LatLng(pointA.getLat(), pointA.getLon()));
optline2.add(new LatLng(pointD.getLat(), pointD.getLon()), new LatLng(pointA.getLat(), pointA.getLon()));
if(i%2 == 0){
optline.color(Color.rgb(red, green, 0));
mMap.addPolyline(optline);
optline = new PolylineOptions();
optline.geodesic(true);
optline.width(10);
}
else{
optline2.color(Color.rgb(red, green, 0));
mMap.addPolyline(optline2);
optline2 = new PolylineOptions();
optline2.geodesic(true);
optline2.width(10);
}
}
现在你有一个梯度一个美丽的线从绿色变为红色。
Now you have a beautiful line with gradient from green to red.
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