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Cesium draw points, lines, and faces
2022-07-06 08:46:00 【Sun batian】
cesium- Draw points 、 Line 、 Noodles
Introduce
In the map frame , Drawing points, lines and surfaces is the most common function , Here we are cesium To achieve it , Make it stick to the ground in 3D terrain
Realization effect
spot
Line
Noodles
Complete code
Use here vue Realize specific functions
<template>
<div class="home">
<el-row type="flex" :gutter="20">
<el-col :span="24">
<div class="grid-content bg-purple">
<el-breadcrumb separator="/">
<el-breadcrumb-item>cesium</el-breadcrumb-item>
<el-breadcrumb-item> Drawing function </el-breadcrumb-item>
<el-breadcrumb-item> spot 、 Line 、 Noodles </el-breadcrumb-item>
</el-breadcrumb>
</div>
</el-col>
</el-row>
<el-row type="flex" :gutter="20">
<el-col :span="24">
<div class="grid-content bg-purple">
<cesiumComponent id="cesium" ref="refCesium"/>
</div>
</el-col>
</el-row>
<el-row type="flex" :gutter="20">
<el-col :span="24">
<div class="grid-content bg-purple">
<el-button type="primary" @click="addDem()"> Reset </el-button>
<el-button type="primary" @click="draw('point')"> Draw points </el-button>
<el-button type="primary" @click="draw('polyline')"> Draw the line </el-button>
<el-button type="primary" @click="draw('polygon')"> Draw face </el-button>
<el-button type="primary" @click="clearDrawEntities"> Empty </el-button>
</div>
</el-col>
</el-row>
</div>
</template>
<script>
import cesiumComponent from '../cesium.vue'
export default {
name: "draw",
data() {
return {
_viewer: undefined,
tempEntities: [],
};
},
components: {
cesiumComponent
},
mounted() {
this.init();
},
methods: {
init() {
this.$refs.refCesium.initMap();
this._viewer = this.$refs.refCesium._viewer;
this.addDem();
},
addDem() {
let that = this;
that._viewer.terrainProvider = new Cesium.CesiumTerrainProvider({
url: '../dem/ASTGTM_N29E087D'
});
that._viewer.camera.flyTo({
destination: Cesium.Cartesian3.fromDegrees(87.42919921875, 28.700224692776988, 67863.0),
orientation: {
heading: Cesium.Math.toRadians(0.0),
pitch: Cesium.Math.toRadians(-45.0),
roll: 0.0
}
});
},
/**
* Draw objects according to type
* @param type point、polyline、polygon
*/
draw(type) {
// Draw points
let that = this;
let viewer = this._viewer;
let tempEntities = this.tempEntities;
let position = [];
let tempPoints = [];
// Open depth detection
viewer.scene.globe.depthTestAgainstTerrain = true;
let handler = new Cesium.ScreenSpaceEventHandler(viewer.scene.canvas);
switch (type) {
case 'point':
// Monitor the left mouse button
handler.setInputAction(function (movement) {
// From the camera position through windowPosition Pixels in world coordinates create a ray . return Cartesian3 Position and direction of rays .
let ray = viewer.camera.getPickRay(movement.position);
// Find the intersection between the ray and the rendered earth surface . Rays must be given in world coordinates . return Cartesian3 object
position = viewer.scene.globe.pick(ray, viewer.scene);
let point = that.drawPoint(position);
tempEntities.push(point);
}, Cesium.ScreenSpaceEventType.LEFT_CLICK);
// Double left click to stop drawing
handler.setInputAction(function () {
handler.destroy();// Close event handle
handler = null;
}, Cesium.ScreenSpaceEventType.LEFT_DOUBLE_CLICK);
// Right click to stop drawing
handler.setInputAction(function () {
handler.destroy();// Close event handle
handler = null;
}, Cesium.ScreenSpaceEventType.RIGHT_CLICK);
break;
case 'polyline':
// Mouse movement events
handler.setInputAction(function (movement) {
}, Cesium.ScreenSpaceEventType.MOUSE_MOVE);
// Left click operation
handler.setInputAction(function (click) {
// Call the interface for obtaining location information
let ray = viewer.camera.getPickRay(click.position);
position = viewer.scene.globe.pick(ray, viewer.scene);
tempPoints.push(position);
let tempLength = tempPoints.length;
// Call the interface for drawing points
let point = that.drawPoint(tempPoints[tempPoints.length - 1]);
tempEntities.push(point);
if (tempLength > 1) {
let pointline = that.drawPolyline([tempPoints[tempPoints.length - 2], tempPoints[tempPoints.length - 1]]);
tempEntities.push(pointline);
} else {
// tooltip.innerHTML = " Please draw the next point , Right click to end ";
}
}, Cesium.ScreenSpaceEventType.LEFT_CLICK);
// Right click operation
handler.setInputAction(function (click) {
tempPoints = [];
handler.destroy();// Close event handle
handler = null;
}, Cesium.ScreenSpaceEventType.RIGHT_CLICK);
break;
case 'polygon':
// Mouse movement events
handler.setInputAction(function (movement) {
}, Cesium.ScreenSpaceEventType.MOUSE_MOVE);
// Left click operation
handler.setInputAction(function (click) {
// Call the interface for obtaining location information
let ray = viewer.camera.getPickRay(click.position);
position = viewer.scene.globe.pick(ray, viewer.scene);
tempPoints.push(position);
let tempLength = tempPoints.length;
// Call the interface for drawing points
let point = that.drawPoint(position);
tempEntities.push(point);
if (tempLength > 1) {
let pointline = that.drawPolyline([tempPoints[tempPoints.length - 2], tempPoints[tempPoints.length - 1]]);
tempEntities.push(pointline);
} else {
// tooltip.innerHTML = " Please draw the next point , Right click to end ";
}
}, Cesium.ScreenSpaceEventType.LEFT_CLICK);
// Right click operation
handler.setInputAction(function (click) {
let cartesian = viewer.camera.pickEllipsoid(click.position, viewer.scene.globe.ellipsoid);
if (cartesian) {
let tempLength = tempPoints.length;
if (tempLength < 3) {
alert(' Please select 3 Execute the closing operation command after more than one point ');
} else {
// Close last line
let pointline = that.drawPolyline([tempPoints[tempPoints.length - 1], tempPoints[0]]);
tempEntities.push(pointline);
that.drawPolygon(tempPoints);
tempEntities.push(tempPoints);
handler.destroy();// Close event handle
handler = null;
}
}
}, Cesium.ScreenSpaceEventType.RIGHT_CLICK);
break;
}
},
drawPoint(position, config) {
let viewer = this._viewer;
let config_ = config ? config : {};
return viewer.entities.add({
name: " Point geometry objects ",
position: position,
point: {
color: Cesium.Color.SKYBLUE,
pixelSize: 10,
outlineColor: Cesium.Color.YELLOW,
outlineWidth: 3,
disableDepthTestDistance: Number.POSITIVE_INFINITY,
heightReference: Cesium.HeightReference.CLAMP_TO_GROUND,
}
});
},
drawPolyline(positions, config_) {
let viewer = this._viewer;
if (positions.length < 1) return;
let config = config_ ? config_ : {};
return viewer.entities.add({
name: " Line geometry objects ",
polyline: {
positions: positions,
width: config.width ? config.width : 5.0,
material: new Cesium.PolylineGlowMaterialProperty({
color: config.color ? new Cesium.Color.fromCssColorString(config.color) : Cesium.Color.GOLD,
}),
depthFailMaterial: new Cesium.PolylineGlowMaterialProperty({
color: config.color ? new Cesium.Color.fromCssColorString(config.color) : Cesium.Color.GOLD,
}),
clampToGround: true,
}
});
},
drawPolygon(positions, config_) {
let viewer = this._viewer;
if (positions.length < 2) return;
let config = config_ ? config_ : {};
return viewer.entities.add({
name: " Face geometry objects ",
polygon: {
hierarchy: positions,
material: config.color ? new Cesium.Color.fromCssColorString(config.color).withAlpha(.2) : new Cesium.Color.fromCssColorString("#FFD700").withAlpha(.2),
},
});
},
/**
* Clear entities
*/
clearDrawEntities() {
let viewer = this._viewer;
this.tempEntities = [];
// Clear previous entities
const entitys = viewer.entities._entities._array;
let length = entitys.length
// Flashback traversal prevents entities from decreasing after entitys[f] non-existent
for (let f = length - 1; f >= 0; f--) {
if (entitys[f]._name && (entitys[f]._name === ' Point geometry objects ' || entitys[f]._name === ' Line geometry objects ' || entitys[f]._name === ' Face geometry objects ')) {
viewer.entities.remove(entitys[f]);
}
}
},
},
created() {
},
}
</script>
<style scoped>
.home {
height: 100%;
margin: 0;
padding: 0;
overflow-y: auto;
overflow-x: hidden;
}
.el-breadcrumb {
margin: 10px;
font-size: 15px;
}
#cesium {
max-height: 600px;
}
</style>
Core code
The realization idea here is to open cesium The monitoring event of , Left click to start drawing , Right click to finish drawing , The specific listening event code is as follows ：
/** * Draw objects according to type * @param type point、polyline、polygon */
draw(type) {
// Draw points
let that = this;
let viewer = this._viewer;
let tempEntities = this.tempEntities;
let position = [];
let tempPoints = [];
// Open depth detection
viewer.scene.globe.depthTestAgainstTerrain = true;
let handler = new Cesium.ScreenSpaceEventHandler(viewer.scene.canvas);
switch (type) {
case 'point':
// Monitor the left mouse button
handler.setInputAction(function (movement) {
// From the camera position through windowPosition Pixels in world coordinates create a ray . return Cartesian3 Position and direction of rays .
let ray = viewer.camera.getPickRay(movement.position);
// Find the intersection between the ray and the rendered earth surface . Rays must be given in world coordinates . return Cartesian3 object
position = viewer.scene.globe.pick(ray, viewer.scene);
let point = that.drawPoint(position);
tempEntities.push(point);
}, Cesium.ScreenSpaceEventType.LEFT_CLICK);
// Double left click to stop drawing
handler.setInputAction(function () {
handler.destroy();// Close event handle
handler = null;
}, Cesium.ScreenSpaceEventType.LEFT_DOUBLE_CLICK);
// Right click to stop drawing
handler.setInputAction(function () {
handler.destroy();// Close event handle
handler = null;
}, Cesium.ScreenSpaceEventType.RIGHT_CLICK);
break;
case 'polyline':
// Mouse movement events
handler.setInputAction(function (movement) {
}, Cesium.ScreenSpaceEventType.MOUSE_MOVE);
// Left click operation
handler.setInputAction(function (click) {
// Call the interface for obtaining location information
let ray = viewer.camera.getPickRay(click.position);
position = viewer.scene.globe.pick(ray, viewer.scene);
tempPoints.push(position);
let tempLength = tempPoints.length;
// Call the interface for drawing points
let point = that.drawPoint(tempPoints[tempPoints.length - 1]);
tempEntities.push(point);
if (tempLength > 1) {
let pointline = that.drawPolyline([tempPoints[tempPoints.length - 2], tempPoints[tempPoints.length - 1]]);
tempEntities.push(pointline);
} else {
// tooltip.innerHTML = " Please draw the next point , Right click to end ";
}
}, Cesium.ScreenSpaceEventType.LEFT_CLICK);
// Right click operation
handler.setInputAction(function (click) {
tempPoints = [];
handler.destroy();// Close event handle
handler = null;
}, Cesium.ScreenSpaceEventType.RIGHT_CLICK);
break;
case 'polygon':
// Mouse movement events
handler.setInputAction(function (movement) {
}, Cesium.ScreenSpaceEventType.MOUSE_MOVE);
// Left click operation
handler.setInputAction(function (click) {
// Call the interface for obtaining location information
let ray = viewer.camera.getPickRay(click.position);
position = viewer.scene.globe.pick(ray, viewer.scene);
tempPoints.push(position);
let tempLength = tempPoints.length;
// Call the interface for drawing points
let point = that.drawPoint(position);
tempEntities.push(point);
if (tempLength > 1) {
let pointline = that.drawPolyline([tempPoints[tempPoints.length - 2], tempPoints[tempPoints.length - 1]]);
tempEntities.push(pointline);
} else {
// tooltip.innerHTML = " Please draw the next point , Right click to end ";
}
}, Cesium.ScreenSpaceEventType.LEFT_CLICK);
// Right click operation
handler.setInputAction(function (click) {
let cartesian = viewer.camera.pickEllipsoid(click.position, viewer.scene.globe.ellipsoid);
if (cartesian) {
let tempLength = tempPoints.length;
if (tempLength < 3) {
alert(' Please select 3 Execute the closing operation command after more than one point ');
} else {
// Close last line
let pointline = that.drawPolyline([tempPoints[tempPoints.length - 1], tempPoints[0]]);
tempEntities.push(pointline);
that.drawPolygon(tempPoints);
tempEntities.push(tempPoints);
handler.destroy();// Close event handle
handler = null;
}
}
}, Cesium.ScreenSpaceEventType.RIGHT_CLICK);
break;
}
},
Draw points 、 Line 、 Face code ：
drawPoint(position, config) {
let viewer = this._viewer;
let config_ = config ? config : {
};
return viewer.entities.add({
name: " Point geometry objects ",
position: position,
point: {
color: Cesium.Color.SKYBLUE,
pixelSize: 10,
outlineColor: Cesium.Color.YELLOW,
outlineWidth: 3,
disableDepthTestDistance: Number.POSITIVE_INFINITY,
heightReference: Cesium.HeightReference.CLAMP_TO_GROUND,
}
});
},
drawPolyline(positions, config_) {
let viewer = this._viewer;
if (positions.length < 1) return;
let config = config_ ? config_ : {
};
return viewer.entities.add({
name: " Line geometry objects ",
polyline: {
positions: positions,
width: config.width ? config.width : 5.0,
material: new Cesium.PolylineGlowMaterialProperty({
color: config.color ? new Cesium.Color.fromCssColorString(config.color) : Cesium.Color.GOLD,
}),
depthFailMaterial: new Cesium.PolylineGlowMaterialProperty({
color: config.color ? new Cesium.Color.fromCssColorString(config.color) : Cesium.Color.GOLD,
}),
clampToGround: true,
}
});
},
drawPolygon(positions, config_) {
let viewer = this._viewer;
if (positions.length < 2) return;
let config = config_ ? config_ : {
};
return viewer.entities.add({
name: " Face geometry objects ",
polygon: {
hierarchy: positions,
material: config.color ? new Cesium.Color.fromCssColorString(config.color).withAlpha(.2) : new Cesium.Color.fromCssColorString("#FFD700").withAlpha(.2),
},
});
},
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