java - KML 文件中不可见的线条

Question

我有一组使用 kml.linestring 连接的点。但是，我想根据这些线路的速度(我可用)对这些线路进行颜色编码> 问题是我的 kml 文件在谷歌地图上呈现时根本不呈现这些线路:(

如果我对一组不同的坐标(多边形)执行相同的操作，则完全可以正常工作。事实上，如果我不对线条进行颜色编码而只使用默认颜色，它会完美地呈现线条。但是，我需要颜色编码。我附上下面的代码:

public static void drawKML(File f) throws IOException
    {
        final  Kml kml= KmlFactory.createKml();
        final  Document document = kml.createAndSetDocument().withName("Document.kml").withOpen(true);

        final LineStyle style1=document.createAndAddStyle().withId("linestyleExample1").createAndSetLineStyle().withColor("ff000000");
        final LineStyle style2=document.createAndAddStyle().withId("linestyleExample2").createAndSetLineStyle().withColor("ff008cff");

        final LineStyle style3=document.createAndAddStyle().withId("linestyleExample3").createAndSetLineStyle().withColor("ff008000");
        FileInputStream fstream=new FileInputStream(f);
        DataInputStream in=new DataInputStream(fstream);
        BufferedReader br=new BufferedReader(new InputStreamReader(in));
        String line=br.readLine();
        Placemark placemark1;

        while(line!=null)
        {
            String[] alpha=line.split(" ");
            double speed=Double.parseDouble(alpha[4])*3.6;
            String description="";
            description=description+"Speed="+speed+"\n";

            if(speed>=0 && speed<=15) {
                document.createAndAddPlacemark().withStyleUrl("#linestyleExample1").withDescription(description).createAndSetLineString().withExtrude(true).withTessellate(true).addToCoordinates(Double.parseDouble(alpha[1]), Double.parseDouble(alpha[0])).addToCoordinates(Double.parseDouble(alpha[3]),Double.parseDouble(alpha[2]));
                logger.error("In black range");
            }
            else if(speed>15 && speed<=35) {
                document.createAndAddPlacemark().withStyleUrl("#linestyleExample2").withDescription(description).createAndSetLineString().withExtrude(true).withTessellate(true).addToCoordinates(Double.parseDouble(alpha[1]), Double.parseDouble(alpha[0])).addToCoordinates(Double.parseDouble(alpha[3]),Double.parseDouble(alpha[2]));
                logger.error("In orange range");
                }
            else {
                document.createAndAddPlacemark().withStyleUrl("#linestyleExample3").withDescription(description).createAndSetLineString().withExtrude(true).withTessellate(true).addToCoordinates(Double.parseDouble(alpha[1]), Double.parseDouble(alpha[0])).addToCoordinates(Double.parseDouble(alpha[3]),Double.parseDouble(alpha[2]));
                logger.error("In green");
            }
            //placemark1.createAndSetLineString().withExtrude(true).withTessellate(true).addToCoordinates(Double.parseDouble(alpha[1]), Double.parseDouble(alpha[0])).addToCoordinates(Double.parseDouble(alpha[3]),Double.parseDouble(alpha[2]));
            line=br.readLine();

        }
        kml.marshal(new File(path/to/file));
    }

它是这样的:

它应该是这样的:

来自错误 kml 文件的片段(不代表任何点):

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<kml xmlns="http://www.opengis.net/kml/2.2" xmlns:gx="http://www.google.com/kml/ext/2.2" xmlns:atom="http://www.w3.org/2005/Atom" xmlns:xal="urn:oasis:names:tc:ciq:xsdschema:xAL:2.0">
    <Document>
            <name>Document.kml</name>
        <open>1</open>
        <Style id="linestyleExample1">
            <LineStyle>
                <color>ff000234</color>
                <width>0.0</width>
            </LineStyle>
        </Style>
        <Style id="linestyleExample2">
            <LineStyle>
                <color>ff008cff</color>
                <width>0.0</width>
            </LineStyle>
        </Style>
        <Style id="linestyleExample3">
            <LineStyle>
                <color>ff006400</color>
                <width>0.0</width>
            </LineStyle>
        </Style>
        <Placemark>
            <description>Speed=0.0
</description>
            <styleUrl>#linestyleExample1</styleUrl>
            <LineString>
                <extrude>1</extrude>
                <tessellate>1</tessellate>
                <coordinates>78.48419,17.38463 78.48302,17.38328</coordinates>
            </LineString>
        </Placemark>
        <Placemark>
            <description>Speed=0.0
</description>
            <styleUrl>#linestyleExample1</styleUrl>
            <LineString>
                <extrude>1</extrude>
                <tessellate>1</tessellate>
                <coordinates>78.48302,17.38328 78.48244,17.38264</coordinates>
            </LineString>
        </Placemark>
        <Placemark>
            <description>Speed=0.0
</description>
            <styleUrl>#linestyleExample1</styleUrl>
            <LineString>
                <extrude>1</extrude>
                <tessellate>1</tessellate>
                <coordinates>78.48244,17.38264 78.48173,17.38204</coordinates>
            </LineString>
        </Placemark>
        <Placemark>
            <description>Speed=51.4415867904
</description>
            <styleUrl>#linestyleExample3</styleUrl>
            <LineString>
                <coordinates>78.48173,17.38204 78.48068,17.38264</coordinates>
            </LineString>
        </Placemark>
        <Placemark>
            <description>Speed=51.4415867904
</description>
            <styleUrl>#linestyleExample3</styleUrl>
            <LineString>
                <coordinates>78.48068,17.38264 78.47993,17.3829</coordinates>
            </LineString>
        </Placemark>
        <Placemark>
            <description>Speed=90.72
</description>
            <styleUrl>#linestyleExample3</styleUrl>
            <LineString>
                <coordinates>78.47993,17.3829 78.47677,17.38331</coordinates>
            </LineString>
        </Placemark>
        <Placemark>
            <description>Speed=76.46400000000001
</description>
            <styleUrl>#linestyleExample3</styleUrl>
            <LineString>
                <coordinates>78.47677,17.38331 78.47521,17.38359</coordinates>
            </LineString>
        </Placemark>
        <Placemark>
            <description>Speed=61.56000000000001
</description>
            <styleUrl>#linestyleExample3</styleUrl>
            <LineString>
                <coordinates>78.47521,17.38359 78.47506,17.38353</coordinates>
            </LineString>
        </Placemark>
        <Placemark>
            <description>Speed=0.0
</description>
            <styleUrl>#linestyleExample1</styleUrl>
            <LineString>
                <extrude>1</extrude>
                <tessellate>1</tessellate>

来自一个确实正确表示它的片段:

<?xml version="1.0" encoding="UTF-8"?>
<kml xmlns="http://www.opengis.net/kml/2.2" xmlns:atom="http://www.w3.org/2005/Atom" xmlns:gx="http://www.google.com/kml/ext/2.2" xmlns:kml="http://www.opengis.net/kml/2.2" xmlns:xal="urn:oasis:names:tc:ciq:xsdschema:xAL:2.0">
    <Document id="feat_1">
        <Style id="stylesel_0">
            <LineStyle>
                <color>ff000000</color>
                <colorMode>normal</colorMode>
            </LineStyle>
        </Style>
        <Style id="stylesel_1">
            <LineStyle>
                <color>ff008cff</color>
                <colorMode>normal</colorMode>
            </LineStyle>
        </Style>
        <Style id="stylesel_2">
            <LineStyle>
                <color>ff008cff</color>
                <colorMode>normal</colorMode>
            </LineStyle>
        </Style>
        <Style id="stylesel_3">
            <LineStyle>
                <color>ff008cff</color>
                <colorMode>normal</colorMode>
            </LineStyle>
        </Style>
        <Style id="stylesel_4">
            <LineStyle>
                <color>ff008cff</color>
                <colorMode>normal</colorMode>
            </LineStyle>
        </Style>
        <Style id="stylesel_5">
            <LineStyle>
                <color>ff008000</color>
                <colorMode>normal</colorMode>
            </LineStyle>
        </Style>
        <Style id="stylesel_6">
            <LineStyle>
                <color>ff008cff</color>
                <colorMode>normal</colorMode>
            </LineStyle>
        </Style>
        <Style id="stylesel_7">
            <LineStyle>
                <color>ff008cff</color>
                <colorMode>normal</colorMode>
            </LineStyle>
        </Style>
        <Style id="stylesel_8">
            <LineStyle>
                <color>ff008cff</color>
                <colorMode>normal</colorMode>
            </LineStyle>
        </Style>
        <Style id="stylesel_9">
            <LineStyle>
                <color>ff008cff</color>
                <colorMode>normal</colorMode>
            </LineStyle>
        </Style>
        <Style id="stylesel_10">
            <LineStyle>
                <color>ff008cff</color>
                <colorMode>normal</colorMode>
            </LineStyle>
        </Style>
        <Style id="stylesel_11">
            <LineStyle>
                <color>ff008cff</color>
                <colorMode>normal</colorMode>
            </LineStyle>
        </Style>
        <Style id="stylesel_12">
            <LineStyle>
                <color>ff008cff</color>
                <colorMode>normal</colorMode>
            </LineStyle>
        </Style>
        <Style id="stylesel_13">
            <LineStyle>
                <color>ff008000</color>
                <colorMode>normal</colorMode>
            </LineStyle>
        </Style>
        <Style id="stylesel_14">
            <LineStyle>
                <color>ff008000</color>
                <colorMode>normal</colorMode>
            </LineStyle>
        </Style>
        <Style id="stylesel_15">
            <LineStyle>
                <color>ff008cff</color>
                <colorMode>normal</colorMode>
            </LineStyle>
        </Style>
        <Style id="stylesel_16">

它们是不同的，因为第二个是使用 Python 生成的(它首先生成很多线型，然后将它们一个一个地分配给点。)

Answer 1

原因是在“错误的”kml 中，您的线型有明确的宽度定义 0.0 将其更改为正数(5.0 左右)，您将看到您的线条或完全删除它以使用默认宽度

Codewise 我不知道你正在使用的库，但我猜这样的东西应该可以解决问题

final LineStyle style2=
    document.createAndAddStyle()
            .withId("linestyleExample2")
            .createAndSetLineStyle()
            .withColor("ff008cff")
            .withWidth(5.0d);