import * as Cesium from "cesium";
/**
* DrawCircle
* @class DrawCircle
*/
export class DrawCircle {
constructor(viewer, options = {}) {
this.viewer = viewer;
this.scene = viewer.scene;
this.handler = new Cesium.ScreenSpaceEventHandler();
this.color = options.color || Cesium.Color.LIGHTGRAY;
this.clampToGround = options.clampToGround || false;
this.status = false;
this.startCartesian = undefined;
this.endCartesian = undefined;
this.startEntity = undefined;
this.endEntity = undefined;
this.lineEntity = undefined;
}
/**
* Enables the distance measurement tool.
* Click to start measuring, and click again to stop.
* @function
* @type {boolean} Continue - Whether to continue measuring after the first click.
* @returns {void}
*/
on = (isContinue = false) => {
this.scene.canvas.style.cursor = "crosshair";
const viewer = this.viewer;
const scene = viewer.scene;
const handler = this.handler;
const mouseLeftClickHandler = (event) => {
if (!this.status) {
this.status = true;
this.clearEntities(viewer);
} else {
this.status = false;
return;
}
// const pickedObject = scene.pick(event.position);
let pickedEllipsoidPosition;
if (scene.pickPositionSupported) {
pickedEllipsoidPosition = viewer.scene.pickPosition(
event.position);
}
if (!pickedEllipsoidPosition) {
pickedEllipsoidPosition = viewer.camera.pickEllipsoid(
event.position,
scene.globe.ellipsoid,
);
const cartographic = Cesium.Cartographic.fromCartesian(
pickedEllipsoidPosition);
const height = viewer.scene.globe.getHeight(
Cesium.Cartographic.fromRadians(cartographic.longitude,
cartographic.latitude, 0));
pickedEllipsoidPosition = Cesium.Cartesian3.fromRadians(
cartographic.longitude, cartographic.latitude, height);
}
// fix height to 1.0m
const manHeight = 0.5;
const convertCartographic = Cesium.Cartographic.fromCartesian(
pickedEllipsoidPosition);
pickedEllipsoidPosition = Cesium.Cartesian3.fromRadians(
convertCartographic.longitude, convertCartographic.latitude,
convertCartographic.height + manHeight);
const cartographic = Cesium.Cartographic.fromCartesian(pickedEllipsoidPosition);
const height = viewer.scene.globe.getHeight(Cesium.Cartographic.fromRadians(cartographic.longitude, cartographic.latitude, 0));
this.startCartesian = pickedEllipsoidPosition;
this.endCartesian = pickedEllipsoidPosition;
this.startEntity = viewer.entities.add({
position: pickedEllipsoidPosition,
point: {
color: this.color,
pixelSize: 4,
disableDepthTestDistance: Number.POSITIVE_INFINITY,
},
show: false,
});
this.lineEntity = viewer.entities.add({
position: this.startCartesian,
ellipse: {
semiMajorAxis: new Cesium.CallbackProperty(() => {
const distance = Cesium.Cartesian3.distance(this.startCartesian, this.endCartesian);
if (distance < 0.1) {
return 0.1;
}
return distance;
}, false),
semiMinorAxis: new Cesium.CallbackProperty(() => {
const distance = Cesium.Cartesian3.distance(this.startCartesian, this.endCartesian);
if (distance < 0.1) {
return 0.1;
}
return distance;
}, false),
extrudedHeight: height,
height: height,
material: this.color.withAlpha(0.5),
outline: true,
outlineColor: Cesium.Color.WHITE,
},
});
this.endEntity = viewer.entities.add({
/* @ts-expect-error */
position: new Cesium.CallbackProperty(() => {
const center = Cesium.Cartesian3.add(this.startCartesian,
this.endCartesian, new Cesium.Cartesian3());
Cesium.Cartesian3.multiplyByScalar(center, 0.5, center);
return center;
}, false),
label: {
showBackground: false,
font: "14px monospace",
fillColor: this.color,
horizontalOrigin: Cesium.HorizontalOrigin.CENTER,
verticalOrigin: Cesium.VerticalOrigin.TOP,
pixelOffset: new Cesium.Cartesian2(0, -20),
disableDepthTestDistance: Number.POSITIVE_INFINITY,
/*text: new Cesium.CallbackProperty(() => {
let distance = Cesium.Cartesian3.distance(
this.startCartesian,
this.endCartesian);
if (distance > 1000) {
distance = `${(distance / 1000).toFixed(3)}km`;
} else {
distance = `${distance.toFixed(3)}m`;
}
// const distance = Cesium.Cartesian3.distance(this.startCartesian, this.endCartesian).toFixed(3);
return `${distance}`;
}, false),*/
},
});
};
const mouseMoveHandler = (moveEvent) => {
if (!this.status) {
return;
}
let pickedEllipsoidPosition;
if (scene.pickPositionSupported) {
pickedEllipsoidPosition = viewer.scene.pickPosition(
moveEvent.endPosition);
}
if (!pickedEllipsoidPosition) {
pickedEllipsoidPosition = viewer.camera.pickEllipsoid(
moveEvent.endPosition,
scene.globe.ellipsoid,
);
const cartographic = Cesium.Cartographic.fromCartesian(
pickedEllipsoidPosition);
const height = viewer.scene.globe.getHeight(
Cesium.Cartographic.fromRadians(cartographic.longitude,
cartographic.latitude, 0));
pickedEllipsoidPosition = Cesium.Cartesian3.fromRadians(
cartographic.longitude, cartographic.latitude, height);
}
// fix height to 1.0m
const manHeight = 0.5;
const convertCartographic = Cesium.Cartographic.fromCartesian(
pickedEllipsoidPosition);
pickedEllipsoidPosition = Cesium.Cartesian3.fromRadians(
convertCartographic.longitude, convertCartographic.latitude,
convertCartographic.height + manHeight);
this.endCartesian = pickedEllipsoidPosition;
};
handler.setInputAction(mouseLeftClickHandler,
Cesium.ScreenSpaceEventType.LEFT_CLICK);
handler.setInputAction(mouseLeftClickHandler,
Cesium.ScreenSpaceEventType.RIGHT_CLICK);
handler.setInputAction(mouseMoveHandler,
Cesium.ScreenSpaceEventType.MOUSE_MOVE);
};
/**
* Disables the measurement tool and clears the entities.
* @function
* @returns {void}
*/
off = () => {
this.scene.canvas.style.cursor = "default";
this.status = false;
this.clearEntities();
const handler = this.handler;
if (handler) {
handler.removeInputAction(Cesium.ScreenSpaceEventType.LEFT_CLICK);
handler.removeInputAction(Cesium.ScreenSpaceEventType.RIGHT_CLICK);
handler.removeInputAction(Cesium.ScreenSpaceEventType.MOUSE_MOVE);
}
};
clearEntities = () => {
this.viewer.entities.remove(this.lineEntity);
this.viewer.entities.remove(this.startEntity);
this.viewer.entities.remove(this.endEntity);
this.lineEntity = undefined;
this.startEntity = undefined;
this.endEntity = undefined;
};
}