feat: 添加当前位置Marker，显示实时设计高度，完善地形图代码

android/src/main/java/com/icegps/geotools/TriangleDisplay.kt

@@ -0,0 +1,54 @@
+package com.icegps.geotools
+
+import com.icegps.geotools.ktx.toMapboxPoint
+import com.icegps.triangulation.Triangle
+import com.mapbox.geojson.Feature
+import com.mapbox.geojson.FeatureCollection
+import com.mapbox.geojson.LineString
+import com.mapbox.maps.MapView
+import com.mapbox.maps.extension.style.layers.addLayer
+import com.mapbox.maps.extension.style.layers.generated.lineLayer
+import com.mapbox.maps.extension.style.layers.properties.generated.LineJoin
+import com.mapbox.maps.extension.style.sources.addSource
+import com.mapbox.maps.extension.style.sources.generated.geoJsonSource
+
+/**
+ * @author tabidachinokaze
+ * @date 2025/11/28
+ */
+fun MapView.displayTriangle(
+    triangles: List<Triangle>,
+    sourceId: String,
+    layerId: String
+) {
+    val features = triangles.map {
+        listOf(it.x1, it.x2, it.x3)
+    }.map {
+        fromPoints(points = it, closed = true)
+    }.map {
+        it.map { line ->
+            val lineA = line.a.toMapboxPoint()
+            val lineB = line.b.toMapboxPoint()
+            LineString.fromLngLats(listOf(lineA, lineB))
+        }.map {
+            Feature.fromGeometry(it)
+        }
+    }.flatten()
+    mapboxMap.getStyle { style ->
+        style.removeStyleLayer(layerId)
+        style.removeStyleSource(sourceId)
+        val source = geoJsonSource(sourceId) {
+            featureCollection(FeatureCollection.fromFeatures(features))
+        }
+        style.addSource(source)
+
+        val layer = lineLayer(layerId, sourceId) {
+            lineWidth(1.5)
+            lineJoin(LineJoin.ROUND)
+            lineOpacity(1.0)
+            lineColor("#ff0000")
+        }
+
+        style.addLayer(layer)
+    }
+}