keyword
property
property Name { field: T = default, … }
A property declares a named record of typed fields, each with a default value. It is the one record keyword in Ludic, and how you use it decides how it is stored: list it in a model (or attach it with spawn) and it becomes a per-instance component held in the engine's storage and bound in queries; construct it with new and it becomes a plain heap record addressed by a pointer. Fields carry a type and a default, so a freshly spawned or new-ed property starts fully seeded. Give fields descriptive names — column/row, not x/y — because those names are what handlers read and write.
Example
program Descent {
property Position { column: int = 0, row: int = 0 }
property Health { current: int = 100, maximum: int = 100 }
model Player { Position, Health }
handler Spawn phase Start {
spawn Hero { Position { column: 4, row: 4 }; Health { current: 80 } }
}
handler DrawWorld phase Render {
Screen.clear(Color.MidnightBlue)
for (position, health) in query [Position, Health, {Player}] {
let bar_width = health.current / 4
Screen.fill_rectangle(x: position.column, y: position.row, width: bar_width, height: 4, color: Color.Crimson)
}
Screen.show()
}
}