Extrude graphics

View inQMLC++
View on GitHub
Sample viewer app

Extrude graphics based on an attribute value.

screenshot

Use case

Graphics representing features can be vertically extruded to represent properties of the data that might otherwise go unseen. Extrusion can add visual prominence to data beyond what may be offered by varying the color, size, or shape of symbol alone. For example, graphics representing wind turbines in a wind farm application can be extruded by a real-world "height" attribute so that they can be visualized in a landscape. Likewise, census data can be extruded by a thematic "population" attribute to visually convey population levels across a country.

How to use the sample

Run the sample. Note that the graphics are extruded to the level set in their height property.

How it works

  1. Create a GraphicsOverlay and SimpleRenderer.
  2. Get the renderer's SceneProperties using renderer::sceneProperties().
  3. Set the extrusion mode for the renderer with props::setExtrusionMode(ExtrusionMode::BaseHeight).
  4. Specify the attribute name of the graphic that the extrusion mode will use: props::setExtrusionExpression("[height]").
  5. Set the renderer on the graphics overlay using graphicsOverlay::setRenderer(renderer).
  6. Create graphics with the attribute set: graphic::attributes()::insertAttribute("height", z).

Relevant API

  • RendererSceneProperties
  • ExtrusionMode
  • SceneProperties::setExtrusionExpression()
  • SimpleRenderer

About the data

Data is hard coded in this sample as a demonstration of how to create and set an attribute to a graphic. To extrude graphics based on pre-existing attributes (e.g. from a feature layer) see the FeatureLayerExtrusion sample.

Tags

3D, extrude, extrusion, height, scene, visualization

Sample Code

ExtrudeGraphics.qmlExtrudeGraphics.cppExtrudeGraphics.h
                              
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
// [WriteFile Name=ExtrudeGraphics, Category=Scenes]
// [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

ExtrudeGraphicsSample {
    width: 800
    height: 600

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

Your browser is no longer supported. Please upgrade your browser for the best experience. See our browser deprecation post for more details.