Create a new set of geometries for analysis (e.g. displaying buffer zones around abandoned coal mine shafts in an area of planned urban development) by clipping intersecting geometries.
How to use the sample
Click the "Clip" button to clip the blue graphic with the red dashed envelopes.
How it works
Create a GraphicsOverlay and add a Graphic containing an envelope.
Create another GraphicsOverlay that contains three other envelopes: one that intersects a part of the first graphic, one that is entirely within it, and another completely outside of it.
Create a third GraphicsOverlay but add no graphics to it.
Create a Button that, when clicked, calls a function that hides the main graphic. In the same function, iterate through the GraphicsOverlay that contains the three envelopes and call GeometryEngine.clip for each Envelope, by passing in the main graphic's Geometry and the current Envelope as arguments.
Add each clipped Geometry graphic to the empty GraphicsOverlay to visualize the clipped geometries.
Relevant API
Envelope
Geometry
GeometryEngine.clip
Graphic
GraphicsOverlay
Additional information
Note: the resulting geometry may be null if the envelope does not intersect the geometry being clipped.
Tags
analysis, clip, geometry
Sample Code
ClipGeometry.qml
Use dark colors for code blocksCopy
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// [WriteFile Name=ClipGeometry, Category=Geometry]// [Legal]// Copyright 2018 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 QtQuick.Controls
import Esri.ArcGISRuntime
Rectangle {
id: rootRectangleclip: truewidth: 800height: 600MapView {
id: mapViewanchors.fill: parentComponent.onCompleted: {
// Set the focus on MapView to initially enable keyboard navigation forceActiveFocus();
}
Map {
Basemap {
initStyle: Enums.BasemapStyleArcGISTopographic
}
initialViewpoint: vc
// Create the envelope for ColoradoEnvelope {
id: coloradoGeometryxMax: -11362327.128340xMin: -12138232.018408yMin: 4441198.773776yMax: 5012861.290274spatialReference: SpatialReference {
wkid: 3857 }
}
// Create the dotted outline for the clipping envelopesSimpleLineSymbol {
id: redOutlinestyle: Enums.SimpleLineSymbolStyleDash
color: "#FFFF0000"width: 3 }
// Create the outline and fill for ColoradoSimpleFillSymbol {
id: coloradoFillSymbolcolor: "#220000FF"style: Enums.SimpleFillSymbolStyleSolid
SimpleLineSymbol {
color: "#FF0000FF"width: 2.0style: Enums.SimpleFillSymbolStyleSolid
}
}
}
ViewpointCenter {
id: vccenter: Point {
x: -11655182.595204y: 4741618.772994spatialReference: SpatialReference {
wkid: 3857 }
}
targetScale: 15151632 }
// Create an envelope outside of ColoradoEnvelope {
id: outsideEnvelopexMax: -11858344.321294xMin: -12201990.219681yMax: 5297071.577304yMin: 5147942.225174spatialReference: SpatialReference {
wkid: 3857 }
}
// Create an envelope intersecting ColoradoEnvelope {
id: intersectingEnvelopexMax: -11962086.479298xMin: -12260345.183558yMax: 4566553.881363yMin: 4332053.378376spatialReference: SpatialReference {
wkid: 3857 }
}
// Create an envelope inside of ColoradoEnvelope {
id: containedEnvelopexMax: -11431488.567009xMin: -11655182.595204yMax: 4741618.772994yMin: 4593570.068343spatialReference: SpatialReference {
wkid: 3857 }
}
// Create a graphics overlay for the Colorado geometryGraphicsOverlay {
id: coloradoOverlay// ColoradoGraphic {
id: coloradoGraphicgeometry: coloradoGeometry
symbol: coloradoFillSymbol
}
}
// Create a graphics overlay to contain the clipping envelopesGraphicsOverlay {
id: envelopesOverlay// Outside envelopeGraphic {
id: outsideEnvelopeGraphicgeometry: outsideEnvelope
symbol: redOutline
}
// Intersecting envelopeGraphic {
id: intersectingEnvelopeGraphicgeometry: intersectingEnvelope
symbol: redOutline
}
// Contained envelopeGraphic {
id: containedEnvelopeGraphicgeometry: containedEnvelope
symbol: redOutline
}
}
// Create a graphics overlay for the clipped graphicsGraphicsOverlay {
id: clippedAreasOverlay }
}
// Create a button that clips the geometry into the envelopesButton {
id: clipOrResetButtonanchors {
horizontalCenter: parent.horizontalCenter
bottom: parent.bottom
bottomMargin: 25 }
text: "Clip"onClicked: {
if (clipOrResetButton.text === "Clip")
{
// Immediately hide the Colorado graphic to prevent overlap coloradoOverlay.visible = false;
// Iterate through the clipping envelopes envelopesOverlay.graphics.forEach(graphic => {
// Create a variable that contains the clip result, which is an envelope of the overlap between colorado and the current graphicconst clippedGeometry = GeometryEngine.clip(coloradoGraphic.geometry, graphic.geometry.extent);
if (clippedGeometry !== null) {
// Create a new graphic using the clip envelope, and fill it in with the colorado fill symbolconst clippedGraphic = ArcGISRuntimeEnvironment.createObject("Graphic", { geometry: clippedGeometry, symbol: coloradoFillSymbol });
// Add the new clipped graphic to the map clippedAreasOverlay.graphics.append(clippedGraphic);
}
});
clipOrResetButton.text = "Reset";
}
else {
clipOrResetButton.text = "Clip";
coloradoOverlay.visible = true;
clippedAreasOverlay.graphics.clear();
}
}
}
}
