Display common symbols for all graphics in a graphics overlay with a renderer.
Use case
Graphics are often used to display data that changes location regularly because they are held in memory instead of being persisted to the map. When a number of graphics are required to share the same style, a simple renderer can be applied to the graphics overlay containing the graphics. For example, the location of mobile taxis from a same company could be plotted on a map with each taxi marked by a relevant symbol.
How to use the sample
The sample loads with a predefined simple renderer, which displays a red cross simple marker symbol for the graphics in the graphics overlay.
How it works
Create a GraphicsOverlay.
Create a number of Point objects with x, y and spatial reference parameters.
Create a SimpleMarkerSymbol passing in a SimpleMarkerSymbolStyle, color and size as parameters.
Create a simple renderer with SimpleRenderer(simpleMarkerSymbol).
Set the simple renderer to the graphics overlay using graphicsOverlay::setRenderer(simpleRenderer).
Create a number of Graphic objects with the points initiated in step 2.
Add the graphics to the graphics overlay with graphicsOverlay::graphics()::append(graphic).
Relevant API
Graphic
GraphicsOverlay
Point
SimpleMarkerSymbol
SimpleRenderer
Additional information
Renderers are used to display graphics that don't already have a symbol set. A renderer will not override a graphic's symbol if one has been set.
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// [WriteFile Name=Simple_Renderer, Category=DisplayInformation]// [Legal]// Copyright 2016 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.// [Legal]#ifdef PCH_BUILD#include"pch.hpp"#endif// PCH_BUILD#include"Simple_Renderer.h"#include"Map.h"#include"MapQuickView.h"#include"Point.h"#include"GraphicsOverlay.h"#include"Graphic.h"#include"SimpleMarkerSymbol.h"#include"SimpleRenderer.h"#include"SpatialReference.h"#include"MapViewTypes.h"#include"MapTypes.h"#include"SymbolTypes.h"#include"TaskWatcher.h"#include"GraphicsOverlayListModel.h"#include"GraphicListModel.h"#include"Envelope.h"usingnamespace Esri::ArcGISRuntime;
Simple_Renderer::Simple_Renderer(QQuickItem* parent) :
QQuickItem(parent)
{
}
Simple_Renderer::~Simple_Renderer() = default;
voidSimple_Renderer::init(){
qmlRegisterType<MapQuickView>("Esri.Samples", 1, 0, "MapView");
qmlRegisterType<Simple_Renderer>("Esri.Samples", 1, 0, "Simple_RendererSample");
}
voidSimple_Renderer::componentComplete(){
QQuickItem::componentComplete();
// find QML MapView component m_mapView = findChild<MapQuickView*>("mapView");
m_mapView->setWrapAroundMode(WrapAroundMode::Disabled);
// Create a map using the imagery basemap m_map = newMap(BasemapStyle::ArcGISImageryStandard, this);
// create graphics overlay m_graphicsOverlay = newGraphicsOverlay(this);
// create red cross SimpleMarkerSymbol SimpleMarkerSymbol* crossSymbol = newSimpleMarkerSymbol(SimpleMarkerSymbolStyle::Cross, QColor("red"), 12, this);
// create renderer and set symbol to crossSymbol SimpleRenderer* simpleRenderer = newSimpleRenderer(crossSymbol, this);
// set the SimpleRenderer to the GraphicsOverlay m_graphicsOverlay->setRenderer(simpleRenderer);
// create points to renderPoint oldFaithfulPoint(-110.828140, 44.460458, SpatialReference::wgs84());
Point cascadeGeyserPoint(-110.829004, 44.462438, SpatialReference::wgs84());
Point plumeGeyserPoint(-110.829381, 44.462735, SpatialReference::wgs84());
// create graphics using points and add them to GraphicsOverlayaddPoint(oldFaithfulPoint);
addPoint(cascadeGeyserPoint);
addPoint(plumeGeyserPoint);
// Set map to map view m_mapView->setMap(m_map);
// set viewpoint using the two farthest points as an envelope with padding m_mapView->setViewpointGeometry(Envelope(oldFaithfulPoint, plumeGeyserPoint), 50);
// add GraphicsOverlay to MapView m_mapView->graphicsOverlays()->append(m_graphicsOverlay);
}
voidSimple_Renderer::addPoint(Point &point){
// create graphic Graphic* graphic = newGraphic(point, this);
// add graphic to Graphic Overlay m_graphicsOverlay->graphics()->append(graphic);
}
