Simple renderer

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Display common symbols for all graphics in a graphics overlay with a renderer.

screenshot

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

  1. Create a GraphicsOverlay.
  2. Create a number of Point objects with x, y and spatial reference parameters.
  3. Create a SimpleMarkerSymbol passing in a SimpleMarkerSymbolStyle, color and size as parameters.
  4. Create a simple renderer with SimpleRenderer(simpleMarkerSymbol).
  5. Set the simple renderer to the graphics overlay using graphicsOverlay::setRenderer(simpleRenderer).
  6. Create a number of Graphic objects with the points initiated in step 2.
  7. 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.

Tags

graphics, marker, renderer, symbol, symbolize, symbology

Sample Code

Simple_Renderer.qmlSimple_Renderer.cppSimple_Renderer.h
                               
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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]

import QtQuick 2.6
import QtQuick.Controls 2.2
import Esri.Samples 1.0

Simple_RendererSample {
    clip: true
    width: 800
    height: 600

    // add a mapView component
    MapView {
        anchors.fill: parent
        objectName: "mapView"
    }
}

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