Simple and fast Entity-Component-System (ECS) library

October 6, 2021 library, Library

Fast ECS

Simple and fast Entity-Component-System (ECS) library written in Dart.

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device Nexus 5 (2014) android 6.0.1
fast_ecs version 0.0.1
all Time 10500(ms)
1024 entities

RotationSystem

void update(double deltaTime, SetEntity entities) {
    for (var i = 0; i < entities.size; i++) {
      Entity entity = entities[i];
      TransformComponent transform = transformComponents[entity];
      VelocityComponent rotation = velocityComponents[entity];
      transform.rotation += rotation.velocity * deltaTime;
      transform.dirty = true;
    }
  }

SpriteSystem

void updateSprite(TransformComponent transform, SpriteComponent sprite) {
    var textureRegion = sprite.textureRegion;
    if (transform.dirty && textureRegion != null) {
      var scos = cos(transform.rotation) * transform.scale;
      var ssin = sin(transform.rotation) * transform.scale;
      var tx = -scos * textureRegion.anchorX + ssin * textureRegion.anchorY;
      var ty = -ssin * textureRegion.anchorX - scos * textureRegion.anchorY;
      sprite.transformData.set(scos, ssin, tx, ty);
      transform.dirty = false;
    }
  }