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48 lines
1.4 KiB
48 lines
1.4 KiB
const std = @import("std");
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const ecs = @import("ecs");
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// override the EntityTraits used by ecs
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pub const EntityTraits = ecs.EntityTraitsType(.small);
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pub const Velocity = struct { x: f32, y: f32 };
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pub const Position = struct { x: f32, y: f32 };
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pub fn main() !void {
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var reg = ecs.Registry.init(std.heap.c_allocator);
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defer reg.deinit();
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var e1 = reg.create();
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reg.add(e1, Position{ .x = 0, .y = 0 });
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reg.add(e1, Velocity{ .x = 5, .y = 7 });
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var e2 = reg.create();
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reg.add(e2, Position{ .x = 10, .y = 10 });
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reg.add(e2, Velocity{ .x = 15, .y = 17 });
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var view = reg.view(.{ Velocity, Position }, .{});
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var iter = view.iterator();
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while (iter.next()) |entity| {
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var pos = view.get(Position, entity);
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const vel = view.getConst(Velocity, entity);
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std.debug.print(
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"entity: {}, pos: (x = {d}, y = {d}), vel: (x = {d}, y = {d})\n",
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.{ entity, pos.x, pos.y, vel.x, vel.y },
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);
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pos.*.x += vel.x;
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pos.*.y += vel.y;
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}
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std.debug.print("---- resetting iter\n", .{});
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iter.reset();
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while (iter.next()) |entity| {
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const pos = view.getConst(Position, entity);
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const vel = view.getConst(Velocity, entity);
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std.debug.print(
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"entity: {}, pos: (x = {d}, y = {d}), vel: (x = {d}, y = {d})\n",
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.{ entity, pos.x, pos.y, vel.x, vel.y },
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);
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}
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}
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