shape editing

examples/index.ts

@@ -1,8 +1,14 @@
 import CesiumPlot from "../src";
+// import CesiumPlot from "../dist/CesiumPlot";
 import * as Cesium from "./cesium/index";
 
-let raster = new Cesium.ArcGisMapServerImageryProvider({
-  url: "https://services.arcgisonline.com/ArcGIS/rest/services/World_Imagery/MapServer",
+// let raster = new Cesium.ArcGisMapServerImageryProvider({
+//   url: "https://services.arcgisonline.com/ArcGIS/rest/services/World_Imagery/MapServer",
+// });
+
+let keda = new Cesium.UrlTemplateImageryProvider({
+  url: "https://10.68.8.41:9043/kmap-server/gridMap/tile/{z}/{y}/{x}",
+  // url: 'http://10.68.8.58:8080/3d/dom2/{z}/{x}/{y}.png'
 });
 const viewer = new Cesium.Viewer("cesiumContainer", {
   animation: false,
@@ -16,7 +22,8 @@ const viewer = new Cesium.Viewer("cesiumContainer", {
   timeline: false,
   navigationHelpButton: false,
   baseLayerPicker: false,
-  imageryProvider: raster,
+  // imageryProvider: raster,
+  imageryProvider: keda,
   contextOptions: {
     requestWebgl2: true,
   },

src/arrow/fine-arrow.ts

@@ -8,32 +8,33 @@ export default class FineArrow extends Draw {
   constructor(cesium: any, viewer: any, style: any) {
     super(cesium, viewer);
     this.cesium = cesium;
-    this.onClick();
+    this.setState('drawing');
   }
 
   /**
    * Add points only on click events
    */
   addPoint(cartesian: Cartesian3) {
-    this.points.push(cartesian);
-    if (this.points.length === 1) {
+    this.points.push();
+    if (this.points.length === 0) {
+      this.points[0] = cartesian;
       this.onMouseMove();
     }
     if (this.points.length === 2) {
       const geometryPoints = this.createPolygon(this.points);
       this.setGeometryPoints(geometryPoints);
       this.addToMap();
-      this.removeClickListener();
       this.removeMoveListener();
+      this.setState('static');
     }
   }
 
   /**
    * Update the last point as the mouse moves.
    */
-  updateMovingPoint(cartesian: Cartesian3) {
-    let tempPoints = [...this.points, cartesian];
-    const geometryPoints = this.createPolygon(tempPoints);
+  updateMovingPoint(cartesian: Cartesian3, index: number) {
+    this.points[index] = cartesian;
+    const geometryPoints = this.createPolygon(this.points);
     this.setGeometryPoints(geometryPoints);
     this.addToMap();
   }
@@ -57,4 +58,8 @@ export default class FineArrow extends Draw {
     const cartesianPoints = this.cesium.Cartesian3.fromDegreesArray(points);
     return cartesianPoints;
   }
+
+  getPoints() {
+    return this.points;
+  }
 }

src/draw.ts

@@ -1,5 +1,6 @@
 import * as Utils from './utils';
 import * as CesiumTypeOnly from '../examples/cesium';
+import { State } from './interface';
 
 export default class Draw {
   cesium: typeof CesiumTypeOnly;
@@ -13,7 +14,10 @@ export default class Draw {
   neckAngle: number;
   eventHandler: CesiumTypeOnly.ScreenSpaceEventHandler;
   entity: CesiumTypeOnly.Entity;
-  geometryPoints: CesiumTypeOnly.Cartesian3[] | undefined;
+  geometryPoints: CesiumTypeOnly.Cartesian3[] = [];
+  state: State = 'drawing';
+  controlPoints: CesiumTypeOnly.EntityCollection;
+  controlPointsEventHandler: CesiumTypeOnly.ScreenSpaceEventHandler;
 
   constructor(cesium: typeof CesiumTypeOnly, viewer: CesiumTypeOnly.Viewer) {
     this.cesium = cesium;
@@ -25,30 +29,74 @@ export default class Draw {
     this.neckAngle = Math.PI / 13;
     this.cartesianToLnglat = this.cartesianToLnglat.bind(this);
     this.pixelToCartesian = this.pixelToCartesian.bind(this);
+    this.onClick();
   }
 
+  /**
+   * The base class provides a method to change the state, and different logic is implemented based on the state.
+   *  The state is controlled by individual sub-components according to the actual situation.
+   * @param state
+   */
+  setState(state: State) {
+    this.state = state;
+  }
+
+  getState(): State {
+    return this.state;
+  }
+
+  /**
+   * Bind a global click event that responds differently based on the state. When in the drawing state,
+   * a click will add points for geometric shapes. During editing, selecting a drawn shape puts it in an
+   *  editable state. Clicking on empty space sets it to a static state.
+   */
   onClick() {
     this.eventHandler = new this.cesium.ScreenSpaceEventHandler(this.viewer.canvas);
     this.eventHandler.setInputAction((evt) => {
-      const cartesian = this.pixelToCartesian(evt.position);
-      this.addPoint(cartesian);
+      const pickedObject = this.viewer.scene.pick(evt.position);
+      const hitEntities = this.cesium.defined(pickedObject) && pickedObject.id instanceof CesiumTypeOnly.Entity;
+      if (this.state === 'drawing') {
+        // In the drawing state, the points clicked are key nodes of the shape, and they are saved in this.points.
+        const cartesian = this.pixelToCartesian(evt.position);
+        this.addPoint(cartesian);
+      } else if (this.state === 'edit') {
+        //In edit mode, exiting the edit state and deleting control points when clicking in the blank area.
+        if (!hitEntities) {
+          this.setState('static');
+          this.removeControlPoints();
+        }
+      } else if (this.state === 'static') {
+        if (hitEntities) {
+          const pickedEntity = pickedObject.id;
+          if (this.cesium.defined(pickedEntity.polygon)) {
+            // Hit PolygonGraphics geometry.
+            this.setState('edit');
+            this.addControlPoints();
+          }
+        }
+      }
     }, this.cesium.ScreenSpaceEventType.LEFT_CLICK);
   }
 
   onMouseMove() {
     this.eventHandler.setInputAction((evt) => {
-      const cartesian = this.pixelToCartesian(evt.endPosition);
-      const lnglat = this.cartesianToLnglat(cartesian);
-      const lastPoint = this.cartesianToLnglat(this.points[this.points.length - 1]);
-      const distance = Utils.MathDistance(lnglat, lastPoint);
-      if (distance < 0.0001) {
-        return false;
-      }
-      // Synchronize data to subclasses.
-      this.updateMovingPoint(cartesian);
+      this.drawingWhileMoving(evt.endPosition, 1);
     }, this.cesium.ScreenSpaceEventType.MOUSE_MOVE);
   }
 
+  drawingWhileMoving(position: CesiumTypeOnly.Cartesian2, index: number) {
+    const cartesian = this.pixelToCartesian(position);
+    const lnglat = this.cartesianToLnglat(cartesian);
+    const points = this.getPoints();
+    const lastPoint = this.cartesianToLnglat(points[points.length - 1]);
+    const distance = Utils.MathDistance(lnglat, lastPoint);
+    if (distance < 0.0001) {
+      return false;
+    }
+    // Synchronize data to subclasses.
+    this.updateMovingPoint(cartesian, index);
+  }
+
   removeClickListener() {
     this.eventHandler.removeInputAction(this.cesium.ScreenSpaceEventType.LEFT_CLICK);
   }
@@ -61,6 +109,10 @@ export default class Draw {
     this.geometryPoints = geometryPoints;
   }
 
+  getGeometryPoints(): CesiumTypeOnly.Cartesian3[] {
+    return this.geometryPoints;
+  }
+
   addToMap() {
     const callback = () => {
       return new this.cesium.PolygonHierarchy(this.geometryPoints);
@@ -89,4 +141,81 @@ export default class Draw {
     const cartesian = this.viewer.scene.globe.pick(ray, this.viewer.scene);
     return cartesian;
   }
+
+  /**
+   * Display key points when creating a shape, allowing dragging of these points to edit and generate new shapes.
+   */
+  addControlPoints() {
+    const points = this.getPoints();
+    this.controlPoints = points.map((position) => {
+      return this.viewer.entities.add({
+        position,
+        billboard: {
+          image: './src/assets/circle_red.png',
+        },
+      });
+    });
+
+    let isDragging = false;
+    let draggedIcon: CesiumTypeOnly.Entity = null;
+
+    this.controlPointsEventHandler = new this.cesium.ScreenSpaceEventHandler(this.viewer.canvas);
+    // Listen for left mouse button press events
+    this.controlPointsEventHandler.setInputAction((clickEvent) => {
+      const pickedObject = this.viewer.scene.pick(clickEvent.position);
+
+      if (this.cesium.defined(pickedObject)) {
+        for (let i = 0; i < this.controlPoints.length; i++) {
+          if (pickedObject.id === this.controlPoints[i]) {
+            isDragging = true;
+            draggedIcon = this.controlPoints[i];
+            draggedIcon.index = i; //Save the index of dragged points for dynamic updates during movement
+            break;
+          }
+        }
+        // Disable default camera interaction.
+        this.viewer.scene.screenSpaceCameraController.enableRotate = false;
+      }
+    }, this.cesium.ScreenSpaceEventType.LEFT_DOWN);
+
+    // Listen for mouse movement events
+    this.controlPointsEventHandler.setInputAction((moveEvent) => {
+      if (isDragging && draggedIcon) {
+        const cartesian = this.viewer.camera.pickEllipsoid(moveEvent.endPosition, this.viewer.scene.globe.ellipsoid);
+        if (cartesian) {
+          draggedIcon.position.setValue(cartesian);
+          this.drawingWhileMoving(moveEvent.endPosition, draggedIcon.index);
+        }
+      }
+    }, this.cesium.ScreenSpaceEventType.MOUSE_MOVE);
+
+    // Listen for left mouse button release events
+    this.controlPointsEventHandler.setInputAction(() => {
+      isDragging = false;
+      draggedIcon = null;
+      this.viewer.scene.screenSpaceCameraController.enableRotate = true;
+    }, this.cesium.ScreenSpaceEventType.LEFT_UP);
+  }
+
+  removeControlPoints() {
+    this.controlPoints.forEach((entity: CesiumTypeOnly.Entity) => {
+      this.viewer.entities.remove(entity);
+    });
+    this.controlPointsEventHandler.removeInputAction(this.cesium.ScreenSpaceEventType.LEFT_DOWN);
+    this.controlPointsEventHandler.removeInputAction(this.cesium.ScreenSpaceEventType.MOUSE_MOVE);
+    this.controlPointsEventHandler.removeInputAction(this.cesium.ScreenSpaceEventType.LEFT_UP);
+  }
+
+  addPoint(cartesian: CesiumTypeOnly.Cartesian3) {
+    //Abstract method that must be implemented by subclasses.
+  }
+
+  getPoints(): CesiumTypeOnly.Cartesian3[] {
+    //Abstract method that must be implemented by subclasses.
+    return this.cesium.Cartesian3();
+  }
+
+  updateMovingPoint(cartesian: CesiumTypeOnly.Cartesian3, index: number) {
+    //Abstract method that must be implemented by subclasses.
+  }
 }

src/interface.ts

@@ -0,0 +1 @@
+export type State = 'drawing' | 'edit' | 'static';