A renderer allows you to change the style of all graphics in a graphics overlay by referencing a single symbol style. A renderer will only effect graphics that do not specify their own symbol style.
Use case
A renderer allows you to change the style of all graphics in an overlay by only changing one copy of the symbol. For example, a user may wish to display a number of graphics on a map of a parkland which represents trees, all sharing a common symbol.
How to use the sample
Run the sample and view graphics for points, lines, and polygons, which are stylized using renderers.
How it works
- Create a
GraphicsOverlayand add it to theMapView. - Create a
Graphic, specifying only aGeometry. - Create a single
Symbolsuch as aSimpleMarkerSymbol. - Create a renderer with the
Symbolsuch as aSimpleRenderer(symbol). - Set the renderer on the
GraphicsOverlaywithgraphicsOverlay.renderer = renderer.
Relevant API
- CubicBezierSegment
- EllipticArcSegment
- GeodesicEllipseParameters
- Geometry
- GeometryEngine
- Graphic
- GraphicsOverlay
- MutablePart
- PolygonBuilder
- PolylineBuilder
- SimpleFillSymbol
- SimpleLineSymbol
- SimpleMarkerSymbol
- SimpleRenderer
Additional information
To set unique symbols across a number of graphics (e.g. showing graphics of individual landmarks) see "Add graphics with symbols" sample.
Tags
arc, bezier, curve, display, ellipse, graphics, marker, overlay, renderer, segment, symbol, true curve
Sample Code
MainActivity.kt
/* Copyright 2022 Esri
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*/
package com.esri.arcgismaps.sample.stylegraphicswithrenderer
import android.os.Bundle
import androidx.appcompat.app.AppCompatActivity
import androidx.databinding.DataBindingUtil
import com.arcgismaps.ApiKey
import com.arcgismaps.ArcGISEnvironment
import com.arcgismaps.Color
import com.arcgismaps.geometry.AngularUnit
import com.arcgismaps.geometry.CubicBezierSegment
import com.arcgismaps.geometry.EllipticArcSegment
import com.arcgismaps.geometry.GeodesicEllipseParameters
import com.arcgismaps.geometry.Geometry
import com.arcgismaps.geometry.GeometryEngine
import com.arcgismaps.geometry.LinearUnit
import com.arcgismaps.geometry.MutablePart
import com.arcgismaps.geometry.Point
import com.arcgismaps.geometry.Polygon
import com.arcgismaps.geometry.PolygonBuilder
import com.arcgismaps.geometry.PolylineBuilder
import com.arcgismaps.geometry.SpatialReference
import com.arcgismaps.mapping.ArcGISMap
import com.arcgismaps.mapping.BasemapStyle
import com.arcgismaps.mapping.Viewpoint
import com.arcgismaps.mapping.symbology.SimpleFillSymbol
import com.arcgismaps.mapping.symbology.SimpleFillSymbolStyle
import com.arcgismaps.mapping.symbology.SimpleLineSymbol
import com.arcgismaps.mapping.symbology.SimpleLineSymbolStyle
import com.arcgismaps.mapping.symbology.SimpleMarkerSymbol
import com.arcgismaps.mapping.symbology.SimpleMarkerSymbolStyle
import com.arcgismaps.mapping.symbology.SimpleRenderer
import com.arcgismaps.mapping.view.Graphic
import com.arcgismaps.mapping.view.GraphicsOverlay
import com.esri.arcgismaps.sample.stylegraphicswithrenderer.databinding.ActivityMainBinding
class MainActivity : AppCompatActivity() {
// set up data binding for the activity
private val activityMainBinding: ActivityMainBinding by lazy {
DataBindingUtil.setContentView(this, R.layout.activity_main)
}
private val mapView by lazy {
activityMainBinding.mapView
}
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
// authentication with an API key or named user is
// required to access basemaps and other location services
ArcGISEnvironment.apiKey = ApiKey.create(BuildConfig.API_KEY)
lifecycle.addObserver(mapView)
// add a map with a topographic basemap style
mapView.map = ArcGISMap(BasemapStyle.ArcGISTopographic)
mapView.setViewpoint(Viewpoint(15.169193, 16.333479, 100_000_000.0))
// add graphics overlays
mapView.graphicsOverlays.addAll(
listOf(
makeRenderedPointGraphicsOverlay(),
makeRenderedLineGraphicsOverlay(),
makeRenderedPolygonGraphicsOverlay(),
makeRenderedCurvedPolygonGraphicsOverlay(),
makeRenderedEllipseGraphicsOverlay()
)
)
}
/**
* Make a point, its graphic, a graphics overlay for it, and add it to the map view.
*/
private fun makeRenderedPointGraphicsOverlay(): GraphicsOverlay {
// create point
val pointGeometry = Point(40e5, 40e5, SpatialReference.webMercator())
// create graphic for point
val pointGraphic = Graphic(pointGeometry)
// red diamond point symbol
val pointSymbol =
SimpleMarkerSymbol(SimpleMarkerSymbolStyle.Diamond, Color.red, 10f)
// create simple renderer
val pointRenderer = SimpleRenderer(pointSymbol)
// create a new graphics overlay with these settings and add it to the map view
return GraphicsOverlay().apply {
// add graphic to overlay
graphics.add(pointGraphic)
// set the renderer on the graphics overlay to the new renderer
renderer = pointRenderer
}
}
/**
* Create a polyline, its graphic, a graphics overlay for it, and add it to the map view.
*/
private fun makeRenderedLineGraphicsOverlay(): GraphicsOverlay {
// create line
val lineBuilder = PolylineBuilder(SpatialReference.webMercator()) {
addPoint(-10e5, 40e5)
addPoint(20e5, 50e5)
}
// create graphic for polyline
val lineGraphic = Graphic(lineBuilder.toGeometry())
// solid blue line symbol
val lineSymbol =
SimpleLineSymbol(SimpleLineSymbolStyle.Solid, Color.blue, 5f)
// create simple renderer
val lineRenderer = SimpleRenderer(lineSymbol)
// create graphic overlay for polyline and add it to the map view
return GraphicsOverlay().apply {
// add graphic to overlay
graphics.add(lineGraphic)
// set the renderer on the graphics overlay to the new renderer
renderer = lineRenderer
}
}
/**
* Create a polygon, its graphic, a graphics overlay for it, and add it to the map view.
*/
private fun makeRenderedPolygonGraphicsOverlay(): GraphicsOverlay {
// create polygon
val polygonBuilder = PolygonBuilder(SpatialReference.webMercator()) {
addPoint(-20e5, 20e5)
addPoint(20e5, 20e5)
addPoint(20e5, -20e5)
addPoint(-20e5, -20e5)
}
// create graphic for polygon
val polygonGraphic = Graphic(polygonBuilder.toGeometry())
// solid yellow polygon symbol
val polygonSymbol =
SimpleFillSymbol(SimpleFillSymbolStyle.Solid, Color.yellow, null)
// create simple renderer
val polygonRenderer = SimpleRenderer(polygonSymbol)
// create graphic overlay for polygon and add it to the map view
return GraphicsOverlay().apply {
// add graphic to overlay
graphics.add(polygonGraphic)
// set the renderer on the graphics overlay to the new renderer
renderer = polygonRenderer
}
}
/**
* Create a curved polygon, its graphic, a graphics overlay for it, and add it to the map view.
*/
private fun makeRenderedCurvedPolygonGraphicsOverlay(): GraphicsOverlay {
// create a point for the center of the geometry
val originPoint = Point(40e5, 5e5, SpatialReference.webMercator())
// create polygon
val curvedPolygonGeometry = makeHeartGeometry(originPoint, 10e5)
// create graphic for polygon
val polygonGraphic = Graphic(curvedPolygonGeometry)
// create a simple fill symbol with outline
val curvedLineSymbol = SimpleLineSymbol(SimpleLineSymbolStyle.Solid, Color.black, 1f)
val curvedFillSymbol =
SimpleFillSymbol(SimpleFillSymbolStyle.Solid, Color.red, curvedLineSymbol)
// create simple renderer
val polygonRenderer = SimpleRenderer(curvedFillSymbol)
// create graphic overlay for polygon and add it to the map view
return GraphicsOverlay().apply {
// add graphic to overlay
graphics.add(polygonGraphic)
// set the renderer on the graphics overlay to the new renderer
renderer = polygonRenderer
}
}
/**
* Create a heart-shape geometry with Bezier and elliptic arc segments from a given [center]
* point and [sideLength].
*/
private fun makeHeartGeometry(center: Point, sideLength: Double): Geometry {
val spatialReference = center.spatialReference
// the x and y coordinates to simplify the calculation
val minX = center.x - 0.5 * sideLength
val minY = center.y - 0.5 * sideLength
// the radius of the arcs
val arcRadius = sideLength * 0.25
// bottom left curve
val leftCurveStart = Point(center.x, minY, spatialReference)
val leftCurveEnd = Point(minX, minY + 0.75 * sideLength, spatialReference)
val leftControlPoint1 = Point(center.x, minY + 0.25 * sideLength, spatialReference)
val leftControlPoint2 = Point(minX, center.y, spatialReference)
val leftCurve = CubicBezierSegment(
leftCurveStart,
leftControlPoint1,
leftControlPoint2,
leftCurveEnd,
spatialReference
)
// top left arc
val leftArcCenter =
Point(minX + 0.25 * sideLength, minY + 0.75 * sideLength, spatialReference)
val leftArc = EllipticArcSegment.createCircularEllipticArc(
leftArcCenter,
arcRadius,
Math.PI,
-Math.PI,
spatialReference
)
// top right arc
val rightArcCenter =
Point(minX + 0.75 * sideLength, minY + 0.75 * sideLength, spatialReference)
val rightArc = EllipticArcSegment.createCircularEllipticArc(
rightArcCenter,
arcRadius,
Math.PI,
-Math.PI,
spatialReference
)
// bottom right curve
val rightCurveStart = Point(minX + sideLength, minY + 0.75 * sideLength, spatialReference)
val rightControlPoint1 = Point(minX + sideLength, center.y, spatialReference)
val rightCurve = CubicBezierSegment(
rightCurveStart,
rightControlPoint1,
leftControlPoint1,
leftCurveStart,
spatialReference
)
// create a mutable part list
val heartParts = MutablePart.createWithSegments(
listOf(leftCurve, leftArc, rightArc, rightCurve),
spatialReference
)
// return the heart
return Polygon(listOf(heartParts).asIterable())
}
/**
* Create an ellipse, its graphic, a graphics overlay for it, and add it to the map view.
*/
private fun makeRenderedEllipseGraphicsOverlay(): GraphicsOverlay {
// create and set all the parameters so that the ellipse has a major axis of 400 kilometres,
// a minor axis of 200 kilometres and is rotated at an angle of -45 degrees
val parameters = GeodesicEllipseParameters.createForPolygon().apply {
axisDirection = -45.0
angularUnit = AngularUnit.degrees
center = Point(40e5, 23e5, SpatialReference.webMercator())
linearUnit = LinearUnit.kilometers
maxPointCount = 100L
maxSegmentLength = 20.0
semiAxis1Length = 200.0
semiAxis2Length = 400.0
}
// define the ellipse parameters to a polygon geometry
val polygon = GeometryEngine.ellipseGeodesicOrNull(parameters)
// set the ellipse fill color
val ellipseSymbol = SimpleFillSymbol(SimpleFillSymbolStyle.Solid, Color.magenta, null)
// return the purple ellipse
return GraphicsOverlay().apply {
// add the symbol to the renderer and add it to the graphic overlay
renderer = SimpleRenderer(ellipseSymbol)
graphics.add(Graphic(polygon))
}
}
private val Color.Companion.blue: Color
get() {
return fromRgba(0, 0, 255, 255)
}
private val Color.Companion.yellow: Color
get() {
return fromRgba(255, 255, 0, 255)
}
private val Color.Companion.magenta: Color
get() {
return fromRgba(255, 0, 255, 255)
}
}