96 lines
2.6 KiB
GDScript
96 lines
2.6 KiB
GDScript
extends Reference
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class_name SummerDayCanvasState
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signal fill_transform_changed(fill_transform)
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signal canvas_transform_changed(canvas_transform)
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signal view_transform_changed(view_transform)
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signal canvas_polygon_changed(polygon)
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var rect_size: Vector2
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var fill_transform := Transform2D.IDENTITY
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var canvas_transform := Transform2D.IDENTITY setget _set_canvas_transform
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var view_transform := Transform2D.IDENTITY # canvas_transform * fill_transform
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var inverse_view_transform := Transform2D.IDENTITY
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# For spacial transform.
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var clip_space_view_transform := Transform2D.IDENTITY
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var canvas_to_clip_space := Transform2D.IDENTITY
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var _canvas_polygon: PoolVector2Array # The polygon, that forms the canvas rect.
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func _init():
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connect("fill_transform_changed", self, "_update_view_transformation")
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connect("canvas_transform_changed", self, "_update_view_transformation")
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func update_fill_transform(scene: SummerDayScene):
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if scene == null:
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fill_transform = Transform2D.IDENTITY
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else:
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var aspect_ratio = scene.aspect_ratio.x / scene.aspect_ratio.y
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var size_ratio = rect_size.x / rect_size.y
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var scale
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var translation = Vector2.ZERO
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if aspect_ratio <= size_ratio:
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scale = rect_size.y
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translation.x = rect_size.x * 0.5 - aspect_ratio * scale * 0.5
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else:
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scale = rect_size.x / aspect_ratio
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translation.y = rect_size.y * 0.5 - scale * 0.5
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fill_transform = Transform2D.IDENTITY.scaled(Vector2(scale, scale))
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fill_transform = fill_transform.translated(translation)
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fill_transform = Transform2D(
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Vector2(scale, 0.0),
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Vector2(0.0, scale),
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translation
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)
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_update_canvas_polygon(scene)
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emit_signal("fill_transform_changed", fill_transform)
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func update_canvas_to_clip_space():
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canvas_to_clip_space = Transform2D(
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Vector2(2.0 / rect_size.x, 0.0),
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Vector2(0.0, -2.0 / rect_size.y),
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Vector2(-1.0, 1.0)
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)
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func _update_view_transformation(transform):
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view_transform = canvas_transform * fill_transform
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inverse_view_transform = view_transform.affine_inverse()
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clip_space_view_transform = canvas_to_clip_space * view_transform
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emit_signal(
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"view_transform_changed", view_transform, clip_space_view_transform
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)
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func _set_canvas_transform(new_canvas_transform):
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canvas_transform = new_canvas_transform
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emit_signal("canvas_transform_changed", canvas_transform)
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func _update_canvas_polygon(scene: SummerDayScene):
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if scene == null:
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_canvas_polygon = PoolVector2Array()
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return
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_canvas_polygon = PoolVector2Array(
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[
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Vector2.ZERO,
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Vector2(scene.raw_aspect_ratio, 0.0),
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Vector2(scene.raw_aspect_ratio, 1.0),
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Vector2(0.0, 1.0)
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]
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)
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emit_signal("canvas_polygon_changed", _canvas_polygon)
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