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Update the orientation of a graphic using expressions based on its attributes.
Use case
Instead of reading the attribute and changing the rotation on the symbol for a single graphic (a manual CPU operation), you can bind the rotation to an expression that applies to the whole overlay (an automatic GPU operation). This usually results in a noticeable performance boost (smooth rotations).
How to use the sample
Adjust the heading and pitch sliders to rotate the cone.
How it works
Create a new graphics overlay.
Create a simple renderer and set its scene properties.
Set the heading expression to [HEADING]
.
Apply the renderer to the graphics overlay.
Create a graphic and add it to the overlay.
To update the graphic's rotation, update the HEADING
or PITCH
property in the graphic's attributes.
Relevant API
Graphic.attributes
GraphicsOverlay
SceneProperties
SceneProperties.headingExpression
SceneProperties.pitchExpression
SimpleRenderer
SimpleRenderer.rendererSceneProperties
3D, expression, graphics, heading, pitch, rotation, scene, symbology
Sample CodeScenePropertiesExpressions.qml
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// [WriteFile Name=ScenePropertiesExpressions, Category=Scenes]
// [Legal]
// Copyright 2019 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
import Esri.ArcGISRuntime
import QtQuick.Controls
Rectangle {
id: rootRectangle
clip : true
width : 800
height : 600
readonly property real longitude : -118.71
readonly property real latitude : 32.09
readonly property real altitude : 100000.0
readonly property int coneDimension : 10000
readonly property real initialPitch : 90.0
readonly property real initialHeading : 180.0
readonly property string headingStr : "heading"
readonly property string pitchStr : "pitch"
SceneView {
id: sceneView
anchors.fill : parent
Scene {
id: scene
Basemap {
initStyle : Enums.BasemapStyleArcGISImageryStandard
}
Surface {
ArcGISTiledElevationSource {
url : "https://elevation3d.arcgis.com/arcgis/rest/services/WorldElevation3D/Terrain3D/ImageServer"
}
}
}
// add a graphics overlay
GraphicsOverlay {
id: graphicsOverlay
LayerSceneProperties {
surfacePlacement : Enums.SurfacePlacementAbsolute
}
SimpleRenderer {
id: sceneRenderer
RendererSceneProperties {
id: renderProps
headingExpression : "[" +headingStr+ "]"
pitchExpression : "[" +pitchStr+ "]"
}
}
Graphic {
id: coneGraphic
geometry : Point {
x : longitude
y : latitude
z : altitude
spatialReference : sceneView.spatialReference
}
SimpleMarkerSceneSymbol {
style : Enums.SimpleMarkerSceneSymbolStyleCone
color : "red"
width : coneDimension
depth : coneDimension
height : coneDimension * 2
anchorPosition : Enums.SceneSymbolAnchorPositionCenter
}
Component.onCompleted : {
coneGraphic.attributes.insertAttribute(headingStr, initialHeading);
coneGraphic.attributes.insertAttribute(pitchStr, initialPitch);
}
}
}
Component.onCompleted : {
// Set the focus on SceneView to initially enable keyboard navigation
forceActiveFocus();
// set viewpoint to the specified camera
setViewpointCameraAndWait(camera);
}
}
Rectangle {
anchors.fill : sliderColumn
color : "lightblue"
}
Column {
id: sliderColumn
spacing : 4
anchors {
left : parent .left
top : parent .top
}
height : childrenRect.height
Text {
anchors {
margins : 5
}
text : pitchStr + ": " + pitchSlider.value.toFixed( 0 )
font.pixelSize : 20
verticalAlignment : Text.AlignTop
}
Slider {
id: pitchSlider
opacity : 0.7
height : 64
// slider controls degrees of rotation:
from : -90
to : 90
value : initialPitch
anchors {
margins : 5
}
onValueChanged : {
coneGraphic.attributes.replaceAttribute(pitchStr, value);
}
}
Text {
anchors {
margins : 5
}
text : headingStr + ": " + headingSlider.value.toFixed( 0 )
verticalAlignment : Text.AlignTop
font.pixelSize : 20
}
Slider {
id: headingSlider
opacity : 0.7
height : 64
// slider controls degrees of rotation:
from : 0
to : 360
value : initialHeading
anchors {
margins : 5
}
onValueChanged : {
coneGraphic.attributes.replaceAttribute(headingStr, value);
}
}
}
Camera {
id: camera
heading : 0.0
pitch : 45.0
roll : 0.0
Point {
x : longitude
y : latitude - 1.0 // place the camera somewhat south of the cone
z : altitude * 2.0 // place the camera somewhat higher than the cone
spatialReference : SpatialReference { wkid : 4326 }
}
}
}