123 lines
3.0 KiB
GDScript3
123 lines
3.0 KiB
GDScript3
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extends RefCounted
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class_name Grid
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var _cells: Dictionary
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var _scale: float
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var size: Vector3
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var scaled_points: Dictionary
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func build(unscaled_size: Vector3, scale: float, boids: Array):
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_scale = scale
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size = Vector3(_scale_axis(unscaled_size.x), _scale_axis(unscaled_size.y), _scale_axis(unscaled_size.z))
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_cells.clear()
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scaled_points.clear()
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var idx := 0
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for boid in boids:
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var scaled_point := _scale_point(boid._get_boid_position())
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_add_body(boid, scaled_point)
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scaled_points[boid.get_instance_id()] = scaled_point
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idx += 1
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func _scale_axis(point: float) -> float:
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return floorf(point / _scale)
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func _scale_point(vector: Vector3) -> Vector3:
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var scaled_point = (vector / _scale).floor()
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scaled_point.x = minf(maxf(scaled_point.x, 0), size.x)
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scaled_point.y = minf(maxf(scaled_point.y, 0), size.y)
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scaled_point.z = minf(maxf(scaled_point.z, 0), size.z)
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return scaled_point
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func _add_body(body: Node, scaled_point: Vector3) -> void:
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var boids := _cells.get(scaled_point, [])
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boids.append(body)
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_cells[scaled_point] = boids
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func _get_cell(x: float, y: float, z: float, write_to: Array[Node]) -> void:
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write_to.append_array(_cells.get(Vector3(x, y, z), []))
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func get_nearby_boids(boid: Node) -> Array[Node]:
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var scaled_point: Vector3 = scaled_points[boid.get_instance_id()]
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# keep the points in bounds
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var x := minf(maxf(scaled_point.x, 0), size.x)
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var y := minf(maxf(scaled_point.y, 0), size.y)
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var z := minf(maxf(scaled_point.z, 0), size.z)
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var results: Array[Node] = []
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var gb := func(x, y, z): _get_cell(x, y, z, results)
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gb.call(x, y, z)
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var up := y - 1
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var down := y + 1
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var left := x - 1
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var right := x + 1
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var forwards := z - 1
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var backwards := z + 1
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# up
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if up > 0:
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gb.call(x, up, z)
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if left > 0:
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gb.call(left, up, z)
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if right <= size.x:
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gb.call(right, up, z)
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if forwards > 0:
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gb.call(x, up, forwards)
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if left > 0:
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gb.call(left, up, forwards)
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if right <= size.x:
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gb.call(right, up, forwards)
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if backwards <= size.z:
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gb.call(x, up, backwards)
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if left > 0:
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gb.call(left, up, backwards)
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if right <= size.x:
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gb.call(right, up, backwards)
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# down
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if down <= size.y:
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gb.call(x, down, z)
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if left > 0:
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gb.call(left, down, z)
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if right <= size.x:
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gb.call(right, down, z)
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if forwards > 0:
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gb.call(x, down, forwards)
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if left > 0:
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gb.call(left, down, forwards)
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if right <= size.x:
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gb.call(right, down, forwards)
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if backwards <= size.z:
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gb.call(x, down, backwards)
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if left > 0:
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gb.call(left, down, backwards)
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if right <= size.x:
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gb.call(right, down, backwards)
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# forwards
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if forwards > 0:
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gb.call(x, y, forwards)
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if left > 0:
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gb.call(left, y, forwards)
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if right <= size.x:
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gb.call(right, y, forwards)
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if backwards <= size.z:
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gb.call(x, y, backwards)
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if left > 0:
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gb.call(left, y, backwards)
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if right <= size.x:
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gb.call(right, y, backwards)
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# left and right
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if left > 0:
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gb.call(left, y, z)
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if right <= size.x:
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gb.call(right, y, z)
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return results
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