31 lines
1.1 KiB
GDScript3
31 lines
1.1 KiB
GDScript3
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class_name ViewUtils
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extends RefCounted
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# Computes the exact world-space rect currently visible on screen by
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# transforming the viewport's real screen corners through the actual canvas
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# transform, instead of approximating with viewport_size * camera.zoom
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# (which assumes a simple centered mapping - stretch/aspect="expand" doesn't
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# necessarily expand symmetrically around center, which was making that
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# approximation under/over-shoot on one side and cull content that was
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# actually on screen).
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static func get_visible_world_rect(node: Node) -> Rect2:
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var canvas_transform: Transform2D = node.get_viewport().get_canvas_transform()
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var inverse: Transform2D = canvas_transform.affine_inverse()
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var size: Vector2 = node.get_viewport_rect().size
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var corners: Array = [
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inverse * Vector2(0, 0),
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inverse * Vector2(size.x, 0),
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inverse * Vector2(0, size.y),
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inverse * Vector2(size.x, size.y),
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]
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var min_pt: Vector2 = corners[0]
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var max_pt: Vector2 = corners[0]
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for c in corners:
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min_pt.x = min(min_pt.x, c.x)
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min_pt.y = min(min_pt.y, c.y)
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max_pt.x = max(max_pt.x, c.x)
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max_pt.y = max(max_pt.y, c.y)
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return Rect2(min_pt, max_pt - min_pt)
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