fix update embed #637. new function: addLabelToLine()

package.json

@@ -1,6 +1,6 @@
 {
   "name": "obsidian-excalidraw-plugin",
-  "version": "1.6.29",
+  "version": "1.6.33",
   "description": "This is an Obsidian.md plugin that lets you view and edit Excalidraw drawings",
 	"main": "lib/index.js",
   "types": "lib/index.d.ts",

src/ExcalidrawAutomate.ts

@@ -948,7 +948,7 @@ export class ExcalidrawAutomate implements ExcalidrawAutomateInterface {
       endArrowHead?: "triangle"|"dot"|"arrow"|"bar"|null;
       padding?: number;
     },
-  ): void {
+  ): string {
     if (!(this.elementsDict[objectA] && this.elementsDict[objectB])) {
       return;
     }
@@ -1032,7 +1032,7 @@ export class ExcalidrawAutomate implements ExcalidrawAutomateInterface {
         aY + (i * (bY - aY)) / (numAP - 1),
       ]);
     }
-    this.addArrow(points, {
+    return this.addArrow(points, {
       startArrowHead: formatting?.startArrowHead,
       endArrowHead: formatting?.endArrowHead,
       startObjectId: objectA,
@@ -1040,6 +1040,45 @@ export class ExcalidrawAutomate implements ExcalidrawAutomateInterface {
     });
   };
 
+  /**
+   * Adds a text label to a line or arrow. Currently only works with a straight (2 point - start & end - line)
+   * @param lineId id of the line or arrow object in elementsDict
+   * @param label the label text
+   * @returns undefined (if unsuccessful) or the id of the new text element
+   */
+  addLabelToLine(lineId: string, label: string): string {
+    const line = this.elementsDict[lineId];
+    if(!line || !["arrow","line"].includes(line.type) || line.points.length !== 2) {
+      return;
+    }
+
+    let angle = Math.atan2(line.points[1][1],line.points[1][0]);
+
+    const size = this.measureText(label);
+    let delta = size.height/6;
+
+    if(angle < 0) {
+      if(angle < -Math.PI/2) {
+        angle+= Math.PI;
+      } else {
+        delta = -delta;
+      } 
+    } else {
+      if(angle > Math.PI/2) {
+        angle-= Math.PI;
+        delta = -delta;
+      }
+    }
+    this.style.angle = angle;
+    const id = this.addText(
+      line.x+line.points[1][0]/2-size.width/2+delta,
+      line.y+line.points[1][1]/2-5*size.height/6,
+      label
+    );
+    this.style.angle = 0;
+    return id;
+  }
+
   /**
    * clear elementsDict and imagesDict only
    */

src/ExcalidrawView.ts

@@ -1250,6 +1250,7 @@ export default class ExcalidrawView extends TextFileView {
     }
     if (this.activeLoader) {
       this.activeLoader.terminate = true;
+      this.activeLoader = null;
     }
     this.nextLoader = null;
     api.resetScene();

src/dialogs/SuggesterInfo.ts

@@ -236,10 +236,16 @@ export const EXCALIDRAW_AUTOMATE_INFO: SuggesterInfo[] = [
   },
   {
     field: "connectObjects",
-    code: "connectObjects(objectA: string, connectionA: ConnectionPoint, objectB: string, connectionB: ConnectionPoint, formatting?: {numberOfPoints?: number; startArrowHead?: string; endArrowHead?: string; padding?: number;},): void;",
+    code: "connectObjects(objectA: string, connectionA: ConnectionPoint, objectB: string, connectionB: ConnectionPoint, formatting?: {numberOfPoints?: number; startArrowHead?: string; endArrowHead?: string; padding?: number;},): string;",
     desc: 'type ConnectionPoint = "top" | "bottom" | "left" | "right" | null\nWhen null is passed as ConnectionPoint then Excalidraw will automatically decide\nnumberOfPoints is the number of points on the line. Default is 0 i.e. line will only have a start and end point.\nArrowHead: "triangle"|"dot"|"arrow"|"bar"|null',
     after: "",
   },
+  {
+    field: "addLabelToLine",
+    code: "addLabelToLine(lineId: string, label: string): string;",
+    desc: 'Adds a text label to a line or arrow. Currently only works with a simple straight 2-point (start & end) line',
+    after: "",
+  }, 
   {
     field: "clear",
     code: "clear(): void;",

src/types.d.ts

@@ -114,7 +114,8 @@ export interface ExcalidrawAutomateInterface {
       endArrowHead?: string; //"triangle"|"dot"|"arrow"|"bar"|null
       padding?: number;
     },
-  ): void;
+  ): string;
+  addLabelToLine(lineId: string, label:string): string;
   clear(): void; //clear elementsDict and imagesDict only
   reset(): void; //clear() + reset all style values to default
   isExcalidrawFile(f: TFile): boolean; //returns true if MD file is an Excalidraw file