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40 lines
978 B
40 lines
978 B
2 days ago
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#include <flecs.h>
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#include <iostream>
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struct Position {
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double x, y;
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};
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struct Velocity {
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double x, y;
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};
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int main() {
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flecs::world ecs;
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// Create a system for Position, Velocity. Systems are like queries (see
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// queries) with a function that can be ran or scheduled (see pipeline).
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flecs::system s = ecs.system<Position, const Velocity>()
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.each([](flecs::entity e, Position& p, const Velocity& v) {
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p.x += v.x;
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p.y += v.y;
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std::cerr << e.name() << ": {" << p.x << ", " << p.y << "}\n";
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});
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// Create a few test entities for a Position, Velocity query
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ecs.entity("e1")
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.set<Position>({10, 20})
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.set<Velocity>({1, 2});
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ecs.entity("e2")
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.set<Position>({10, 20})
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.set<Velocity>({3, 4});
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// This entity will not match as it does not have Position, Velocity
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ecs.entity("e3")
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.set<Position>({10, 20});
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// Run the system
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s.run();
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}
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