Added left and right click events, fixed display details option/functionality, added function that safely removes the node and prevented addition of new roads if they are bounded by the same nodes (distance/length check)

src/infrastructure/node_manager.zig

@@ -22,13 +22,13 @@ pub const NodeManager = struct {
 
     pub fn draw(self: *const NodeManager, display_details: bool) void {
         for (self.nodes.items) |node| {
+            if (display_details) rl.drawCircleV(node.pos, c.NODE_SNAP_RADIUS * c.NODE_RADIUS, .pink);
             rl.drawCircleV(node.pos, c.NODE_RADIUS, .brown);
         }
 
         const pos = rl.getMousePosition();
 
         if (self.temp_node) |node| {
-            if (display_details) rl.drawCircleV(node.pos, c.NODE_SNAP_RADIUS * c.NODE_RADIUS, .pink);
 
             rl.drawLineEx(node.pos, pos, c.ROAD_SIZE, .black);
             rl.drawCircleV(node.pos, c.NODE_RADIUS, .brown);
@@ -41,10 +41,7 @@ pub const NodeManager = struct {
     pub fn add(self: *NodeManager, pos: rl.Vector2) ?*Node {
         const pos_node = self.getSelectedNode(pos);
 
-        if (self.temp_node) |_| {
-            // TODO add road length check before creating the second node / returning
-            return pos_node;
-        }
+        if (self.temp_node != null) return pos_node;
 
         self.temp_node = pos_node;
         return null;
@@ -83,9 +80,23 @@ pub const NodeManager = struct {
         return if (last_ref) |ref| ref.*.id + 1 else 0;
     }
 
+    /// Iterates through all nodes and runs the deinit procedure on each of them
     pub fn clear(self: *NodeManager, allocator: std.mem.Allocator) void {
         for (self.nodes.items) |*node| {
             node.deinit(allocator);
         }
     }
+
+    /// Removes the node from the list with all appropriate checks
+    pub fn removeNode(self: *NodeManager, node_to_remove: *Node) void {
+        // In case the node has references to the existing roads we can not remove it
+        if (node_to_remove.roads.items.len > 0) return;
+
+        for (self.nodes.items, 0..) |*node, i| {
+            if (node.id != node_to_remove.id) continue;
+
+            _ = self.nodes.swapRemove(i);
+            return;
+        }
+    }
 };

src/simulator.zig

@@ -53,9 +53,18 @@ pub const Simulator = struct {
     /// every mouse event is checked here
     fn handleMouseInput(self: *Simulator) void {
         const pos = rl.getMousePosition();
-        if (!rl.isMouseButtonReleased(.left)) return;
 
+        if (rl.isMouseButtonReleased(.left)) {
+            self.leftClickEvent(pos);
+        }
+        else if (rl.isMouseButtonReleased(.right)) self.rightClickEvent();
+
+    }
+
+    fn leftClickEvent(self: *Simulator, pos: rl.Vector2) void {
         if (self.node_man.add(pos)) |node| {
+            if (self.node_man.temp_node.?.id == node.id) return;
+
             self.road_man.add(self.allocator, self.node_man.temp_node.?, node) catch |err| {
                 std.debug.panic("Error while attempting to add a road: {}\n", .{err});
             };
@@ -64,6 +73,13 @@ pub const Simulator = struct {
         }
     }
 
+    fn rightClickEvent(self: *Simulator) void {
+        if (self.node_man.temp_node) |node| {
+            self.node_man.removeNode(node);
+            self.node_man.temp_node = null;
+        }
+    }
+
     /// The main drawing function that is exposed upwards
     pub fn draw(self: *const Simulator) void {
         self.road_man.draw();
@@ -73,6 +89,7 @@ pub const Simulator = struct {
         rl.clearBackground(.light_gray);
     }
 
+    /// Draws UI elements like text
     fn drawUI(self: *const Simulator) void {
         var buf: [1024]u8 = undefined;