Implement LineTool.ts

frontend/src/tools/drawing/LineTool.ts

@@ -0,0 +1,39 @@
+import { Tool } from '../Tool';
+import { YjsDocument } from '../../crdt/YjsDocument';
+
+class LineTool extends Tool {
+  private startPoint: { x: number; y: number } | null = null;
+
+  constructor(yjsDoc: YjsDocument) {
+    super(yjsDoc);
+    this.name = 'LineTool';
+  }
+
+  onMouseDown(event: MouseEvent): void {
+    if (!this.startPoint) {
+      this.startPoint = { x: event.clientX, y: event.clientY };
+    } else {
+      // Create line element in Yjs document
+      this.yjsDoc.createLine(this.startPoint.x, this.startPoint.y, event.clientX, event.clientY);
+      this.startPoint = null;
+    }
+  }
+
+  onMouseMove(event: MouseEvent): void {
+    // Preview line while dragging
+  }
+
+  onMouseUp(event: MouseEvent): void {
+    // Handle mouse up if needed
+  }
+
+  onKeyUp(event: KeyboardEvent): void {
+    // Handle key up events
+  }
+
+  reset(): void {
+    this.startPoint = null;
+  }
+}
+
+export { LineTool };