src/app/pages/algorithms/pathfinding/pathfinding.component.ts

@@ -114,10 +114,9 @@ export class PathfindingComponent implements AfterViewInit {
     }
 
     // Default after size changes: pick one consistent scenario
-    this.edgeCase();
+    this.normalCase();
   }
 
-  // Scenarios (buttons)
   normalCase(): void {
     this.stopAnimations();
     this.initializeGrid(true, 'normal');
@@ -250,7 +249,7 @@ export class PathfindingComponent implements AfterViewInit {
     this.endNode.isEnd = true;
 
     if (withWalls) {
-      this.placeDefaultDiagonalWall();
+      this.placeDefaultDiagonalWall(scenario);
     }
   }
 
@@ -300,7 +299,37 @@ export class PathfindingComponent implements AfterViewInit {
     };
   }
 
-  private placeDefaultDiagonalWall(): void {
+  private placeDefaultDiagonalWall(scenario: 'normal' | 'edge'): void {
+    if (scenario === 'edge') {
+      this.createDiagonalWall();
+    }
+    else if (scenario === 'normal') {
+      this.createVerticalWall();
+    }
+  }
+
+  private createVerticalWall() {
+    const height = this.gridRows;
+    const startCol = Math.floor(this.gridCols / 2);
+
+    for (let i = 5; i < (height - 5); i++) {
+      const row = i;
+
+      if (!this.isValidPosition(row, startCol)) {
+        continue;
+      }
+
+      const node = this.grid[row][startCol];
+      if (node.isStart || node.isEnd) {
+        continue;
+      }
+
+      node.isWall = true;
+    }
+
+  }
+
+  private createDiagonalWall() {
     // Diagonal-ish wall; avoids start/end
     const len = Math.min(this.gridRows, this.gridCols);
     const startCol = Math.floor((this.gridCols - len) / 2);
@@ -322,7 +351,7 @@ export class PathfindingComponent implements AfterViewInit {
     }
   }
 
-  // Path state
+// Path state
   private clearPath(): void {
     for (let row = 0; row < this.gridRows; row++) {
       for (let col = 0; col < this.gridCols; col++) {