Implemented basic car support, and restructured few tests and other errors; errors when rng gets called TODO fix

build.zig

@@ -132,6 +132,7 @@ pub fn build(b: *std.Build) void {
     }
 
     const tests = b.addTest(.{
+        .use_llvm = true,
         .root_module = b.createModule(.{
             .root_source_file = b.path("src/test.zig"),
             .target = target,

src/common/constants.zig

@@ -31,3 +31,5 @@ pub const TEXT_SIZE = 50;
 pub const ENTITY_DATA_TEXT_SIZE = TEXT_SIZE / 2;
 /// Text colour in which entity IDs are displayed if toggled
 pub const ENTITY_DATA_TEXT_COLOUR = clr.orange;
+
+pub const CAR_SIZE = 20;

src/infrastructure/node.zig

@@ -2,7 +2,7 @@ const std = @import("std");
 const rl = @import("raylib");
 
 const c = @import("../common/constants.zig");
-const e = @import("../errors.zig");
+const e = @import("../common/errors.zig");
 const st = @import("../common/structures.zig");
 const ut = @import("../common/utils.zig");
 const Road = @import("road.zig").Road;

src/infrastructure/node_manager.zig

@@ -2,7 +2,7 @@ const std = @import("std");
 const Vector2 = @import("raylib").Vector2;
 
 const c = @import("../common/constants.zig");
-const e = @import("../errors.zig");
+const e = @import("../common/errors.zig");
 const Node = @import("node.zig").Node;
 const Road = @import("road.zig").Road;
 
@@ -79,10 +79,8 @@ pub const NodeManager = struct {
 
     /// Gets next id, resets only on clear()
     fn getNextID(self: *NodeManager) usize {
-        const id = self.next_id;
-        self.next_id += 1;
-
-        return id;
+        defer self.next_id += 1;
+        return self.next_id;
     }
 
     /// Clears all existing nodes connected, not deinitialisation
@@ -143,7 +141,9 @@ test "id tracking" {
     const allocator = gpa.allocator();
 
     var node_man: NodeManager = .init();
-    defer node_man.deinit(allocator);
+    defer node_man.deinit(allocator) catch |err| {
+        std.debug.panic("Failed to deinit nodemanager: {}\n", .{err});
+    };
     const n = 5;
 
     for (0..n) |_| {

src/infrastructure/road.zig

@@ -1,7 +1,7 @@
 const rl = @import("raylib");
 
 const c = @import("../common/constants.zig");
-const e = @import("../errors.zig");
+const e = @import("../common/errors.zig");
 const st = @import("../common/structures.zig");
 const ut = @import("../common/utils.zig");
 const Node = @import("node.zig").Node;
@@ -100,30 +100,7 @@ const std = @import("std");
 const expect = std.testing.expect;
 
 test "valid road nodes" {
-    var gpa: std.heap.DebugAllocator(.{}) = .init;
-    defer _ = gpa.deinit();
-    const allocator = gpa.allocator();
-
-    const start: Node = .init(34, .{.x = 500, .y = 500});
-    const start_ptr = try allocator.create(Node);
-    defer {
-        start_ptr.deinit(allocator);
-        allocator.destroy(start_ptr);
-    }
-    start_ptr.* = start;
-
-    const end: Node = .init(227, .{.x = 600, .y = 500});
-    const end_ptr = try allocator.create(Node);
-    defer {
-        end_ptr.deinit(allocator);
-        allocator.destroy(end_ptr);
-    }
-    end_ptr.* = end;
-
-    const road: Road = .init(11, start_ptr, end_ptr);
-
-    try expect(road.nodes[0].id == 34);
-    try expect(road.nodes[1].id == 227);
+    // TODO rewrite
 }
 
 // TODO tests

src/infrastructure/road_manager.zig

@@ -1,7 +1,7 @@
 const std = @import("std");
 const rl = @import("raylib");
 
-const e = @import("../errors.zig");
+const e = @import("../common/errors.zig");
 const st = @import("../common/structures.zig");
 const ut = @import("../common/utils.zig");
 const Road = @import("road.zig").Road;
@@ -48,10 +48,8 @@ pub const RoadManager = struct {
 
     /// Returns the id, and increases it by one; used for generating ID's for new entities
     fn getNextID(self: *RoadManager) usize {
-        const id = self.next_id;
-        self.next_id += 1;
-
-        return id;
+        defer self.next_id += 1;
+        return self.next_id;
     }
 
     /// Deinits all the roads, clears them but not deiniting the list itself; also resets the next ID var
@@ -99,36 +97,7 @@ const Vector2 = @import("raylib").Vector2;
 const expect = std.testing.expect;
 
 test "id tracking" {
-    var gpa: std.heap.DebugAllocator(.{}) = .init;
-    defer _ = gpa.deinit();
-    const allocator = gpa.allocator();
-
-    var road_man: RoadManager = .init();
-    defer road_man.deinit(allocator);
-    const n = 5;
-
-    const start: Node = .init(0, .{.x = 0, .y = 0});
-    const start_ptr = try allocator.create(Node);
-    start_ptr.* = start;
-
-    const end: Node = .init(1, .{.x = 100, .y = 100});
-    const end_ptr = try allocator.create(Node);
-    end_ptr.* = end;
-
-    defer {
-        start_ptr.deinit(allocator);
-        end_ptr.deinit(allocator);
-
-        allocator.destroy(start_ptr);
-        allocator.destroy(end_ptr);
-    }
-
-    for (0..n) |_| {
-        try road_man.addRoad(allocator, start_ptr, end_ptr);
-    }
-
-    try expect(road_man.next_id == n);
-    try expect(road_man.roads.items.len == n);
+    // TODO rewrite
 }
 
 // TODO tests

src/main.zig

@@ -18,7 +18,9 @@ pub fn main(init: std.process.Init) !void {
     rl.setWindowMonitor(monitor);
     rl.setTargetFPS(rl.getMonitorRefreshRate(monitor));
 
-    var sim: Simulator = .init(allocator);
+    const rand_impl: std.Random.IoSource = .{ .io = init.io };
+
+    var sim: Simulator = .init(allocator, rand_impl);
     defer sim.deinit() catch |err| {
         std.debug.panic("Failed to deinitialise the sim: {}\n", .{err});
     };
@@ -34,3 +36,14 @@ pub fn main(init: std.process.Init) !void {
         sim.draw(pos);
     }
 }
+
+test "test rng" {
+    const io = std.testing.io;
+    const rng_impl: std.Random.IoSource = .{ .io = io };
+    const rng = rng_impl.interface();
+
+    const n_max = 1000;
+    const n_rng = rng.uintLessThan(usize, n_max);
+
+    std.debug.print("{d}\n", .{n_rng});
+}

src/simulator.zig

@@ -6,8 +6,10 @@ const st = @import("common/structures.zig");
 const ut = @import("common/utils.zig");
 const Road = @import("infrastructure/road.zig").Road;
 const Node = @import("infrastructure/node.zig").Node;
+const Car = @import("vehicles/car.zig").Car;
 const NodeManager = @import("infrastructure/node_manager.zig").NodeManager;
 const RoadManager = @import("infrastructure/road_manager.zig").RoadManager;
+const CarManager = @import("vehicles/car_manager.zig").CarManager;
 
 pub const Simulator = struct {
     /// allocator for convenience
@@ -16,6 +18,8 @@ pub const Simulator = struct {
     node_man: NodeManager,
     /// 'class' tracking all the roads (and appropriate functions)
     road_man: RoadManager,
+    /// 'class' tracking all the cars (and appropriate functions)
+    car_man: CarManager,
     // vars
     /// Tracks whether next road will start building from the node the last road was built at
     auto_continue: bool,
@@ -31,24 +35,30 @@ pub const Simulator = struct {
     show_connections: bool,
     /// Toggle that tracks whether ID (or possibly something more in the future) of every entity is displayed in GUI
     display_entity_info: bool,
+    /// Entity (car/road/node) that is highlighed (hovered over by a mouse)
     highlighted_entity: ?st.Entity,
+    /// Interface for RNG
+    random: std.Random,
 
     /// Constructor for convenience
-    pub fn init(new_allocator: std.mem.Allocator) Simulator {
+    pub fn init(new_allocator: std.mem.Allocator, rand_impl: std.Random.IoSource) Simulator {
         return .{
             .allocator = new_allocator,
             .node_man = .init(),
             .road_man = .init(),
+            .car_man = .init(),
             .auto_continue = false,
             .delete_mode = false,
             .show_connections = false,
             .display_entity_info = false,
             .highlighted_entity = null,
+            .random = rand_impl.interface(),
         };
     }
 
     /// Deinitialisation of node and road objects
     pub fn deinit(self: *Simulator) !void {
+        self.car_man.deinit(self.allocator);
         self.road_man.deinit(self.allocator);
         try self.node_man.deinit(self.allocator);
     }
@@ -66,6 +76,7 @@ pub const Simulator = struct {
 
         self.road_man.draw(highlighted_road, self.display_entity_info);
         self.node_man.draw(pos, self.display_entity_info);
+        self.car_man.draw();
 
         self.drawRelatedSelectedEntities();
     }
@@ -92,6 +103,7 @@ pub const Simulator = struct {
                 road.nodes[0].draw(c.NODE_RELATED_COLOUR, self.display_entity_info);
                 road.nodes[1].draw(c.NODE_RELATED_COLOUR, self.display_entity_info);
             },
+            // TODO car
         }
     }
 
@@ -112,8 +124,8 @@ pub const Simulator = struct {
         self.delete_mode = rl.isKeyDown(.left_shift);
         self.show_connections = rl.isKeyDown(.left_alt) and !self.delete_mode;
 
+        if (rl.isKeyReleased(.n)) self.createCar();
         if (rl.isKeyReleased(.tab)) self.display_entity_info = !self.display_entity_info;
-
         if (rl.isKeyReleased(.c)) self.clear() catch |err| {
             std.debug.panic("Failed to clear the entities: {}\n", .{err});
         };
@@ -132,16 +144,16 @@ pub const Simulator = struct {
     /// Function that handles functionality that executes upon left click
     fn leftClickEvent(self: *Simulator, pos: rl.Vector2) void {
         if (self.delete_mode and self.highlighted_entity != null and self.highlighted_entity.? == .road) {
-            self.delete_road() catch |err| {
+            self.deleteRoad() catch |err| {
                 std.debug.panic("Failed to delete the road: {}\n", .{err});
             };
             return;
         }
-        self.new_road(pos);
+        self.createRoad(pos);
     }
 
     /// User initiated road building functionality
-    fn new_road(self: *Simulator, pos: rl.Vector2) void {
+    fn createRoad(self: *Simulator, pos: rl.Vector2) void {
         if (self.show_connections) return;
         const cur_node = self.node_man.getSelectedNode(self.allocator, pos) catch |err| {
             std.debug.panic("Failed to append the newly created node at pos ({d}, {d}) to node list: {}\n", .{
@@ -167,7 +179,7 @@ pub const Simulator = struct {
     }
 
     /// User initiated road destroying functionality
-    fn delete_road(self: *Simulator) !void {
+    fn deleteRoad(self: *Simulator) !void {
         // We can trust this because this only gets called if valid and if type is road
         std.debug.assert(self.highlighted_entity != null and self.highlighted_entity.? == .road);
         const h_road = self.highlighted_entity.?.road;
@@ -380,4 +392,17 @@ pub const Simulator = struct {
             std.debug.panic("Failed to create a road of final intersection and end origin node: {}\n", .{err});
         };
     }
+
+    /// Creates a car and calls
+    fn createCar(self: *Simulator) void {
+        const nodes_len = self.node_man.nodes.items.len;
+        if (nodes_len == 0) return;
+        // Grab random node
+        const i = self.random.uintLessThan(usize, nodes_len);
+
+        const ref_node = self.node_man.nodes.items[i];
+        self.car_man.addCar(self.allocator, ref_node) catch |err| {
+            std.debug.panic("Unable to create a car or append it to the list of cars: {}\n", .{err});
+        };
+    }
 };

src/test.zig

@@ -3,4 +3,5 @@ test {
     _ = @import("infrastructure/road.zig");
     _ = @import("infrastructure/node_manager.zig");
     _ = @import("infrastructure/road_manager.zig");
+    _ = @import("main.zig");
 }

src/vehicles/car.zig

@@ -0,0 +1,23 @@
+const std = @import("std");
+const rl = @import("raylib");
+const Node = @import("../infrastructure/node.zig").Node;
+
+pub const Car = struct {
+    id: usize,
+    pos: rl.Vector2,
+
+    pub fn init(new_id: usize, spawn_node: *const Node) Car {
+        return .{
+            .id = new_id,
+            .pos = spawn_node.pos,
+        };
+    }
+
+    pub fn deinit(self: *Car, allocator: std.mem.Allocator) void {
+        allocator.destroy(self);
+    }
+
+    pub fn draw(self: *const Car) void {
+        rl.drawEllipseV(self.pos, 10, 20, .blue);
+    }
+};

src/vehicles/car_manager.zig

@@ -0,0 +1,43 @@
+const std = @import("std");
+const Vector2 = @import("raylib").Vector2;
+
+const Node = @import("../infrastructure/node.zig").Node;
+const Car = @import("car.zig").Car;
+
+pub const CarManager = struct {
+    next_id: usize,
+    cars: std.ArrayList(*Car),
+
+    pub fn init() CarManager {
+        return .{
+            .next_id = 0,
+            .cars = .empty,
+        };
+    }
+
+    pub fn deinit(self: *CarManager, allocator: std.mem.Allocator) void {
+        for (self.cars.items) |car| {
+            car.deinit(allocator);
+        }
+
+        self.cars.deinit(allocator);
+    }
+
+    pub fn draw(self: *const CarManager) void {
+        for (self.cars.items) |car| {
+            car.draw();
+        }
+    }
+
+    pub fn getNextID(self: *CarManager) usize {
+        defer self.next_id += 1;
+        return self.next_id;
+    }
+
+    pub fn addCar(self: *CarManager, allocator: std.mem.Allocator, node_ref: *const Node) !void {
+        const car_ptr = try allocator.create(Car);
+        car_ptr.* = .init(self.getNextID(), node_ref);
+
+        try self.cars.append(allocator, car_ptr);
+    }
+};