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zig-base-road-network/src/infrastructure/node_manager.zig
2026-04-07 10:45:02 +02:00

81 lines
2.3 KiB
Zig

const std = @import("std");
const rl = @import("raylib");
const c = @import("../constants.zig");
const Node = @import("node.zig").Node;
pub const NodeManager = struct {
temp_node: ?*Node,
nodes: std.ArrayList(Node),
pub fn init(allocator: std.mem.Allocator) !NodeManager {
return .{
.temp_node = null,
.nodes = try .initCapacity(allocator, c.ALLOC_SIZE),
};
}
pub fn deinit(self: *NodeManager, allocator: std.mem.Allocator) void {
for (self.nodes.items) |*node| {
node.deinit(allocator);
}
self.nodes.deinit(allocator);
}
pub fn draw(self: *const NodeManager, display_details: bool) void {
for (self.nodes.items) |node| {
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);
rl.drawCircleV(pos, c.NODE_RADIUS, .blue);
}
}
pub fn add(self: *NodeManager, pos: rl.Vector2) ?*Node {
const pos_node = self.getSelectedNode(pos);
if (self.temp_node) |_| {
return pos_node;
}
self.temp_node = pos_node;
return null;
}
fn getSelectedNode(self: *NodeManager, pos: rl.Vector2) *Node {
for (self.nodes.items) |*node| {
if (!rl.checkCollisionPointCircle(pos, node.pos, c.NODE_SNAP_RADIUS * c.NODE_RADIUS))
continue;
return node;
}
// We couldn't find the existing node and as such must create a new one
const node: Node = .init(self.getNewID(), pos);
self.nodes.appendBounded(node) catch |err| {
std.debug.panic("This is because preallocated size got exceeded, TODO fix:\n{}\n", .{err});
};
return self.getLastRef().?;
}
fn getNewID(self: *const NodeManager) usize {
const last_ref = self.getLastRef();
return if (last_ref) |ref| ref.*.id + 1 else 0;
}
fn getLastRef(self: *const NodeManager) ?*Node {
const nlen = self.nodes.items.len;
return if (nlen == 0) null else &self.nodes.items[nlen - 1];
}
};