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42 lines
1.2 KiB
42 lines
1.2 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.testing.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.warn("entity: {}, pos: {d}, vel: {d}\n", .{ entity, pos.*, vel });
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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.warn("---- 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.warn("entity: {}, pos: {d}, vel: {d}\n", .{ entity, pos, vel });
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}
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}
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