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Improve docs on how ParallaxLayer mirroring works. 

I wrote everything I wish was written when I tried to make an
infinite scrolling background, addressing every point of every
mistake I made.

(cherry picked from commit 40813b68f0)
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Lucas Clemente Vella 2023-08-22 15:01:24 +01:00 committed by Rémi Verschelde
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commit cdf8e0e87c
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7
doc/classes/ParallaxLayer.xml
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@ -12,9 +12,10 @@
</tutorials> </tutorials>
<members> <members>
<member name="motion_mirroring" type="Vector2" setter="set_mirroring" getter="get_mirroring" default="Vector2(0, 0)"> <member name="motion_mirroring" type="Vector2" setter="set_mirroring" getter="get_mirroring" default="Vector2(0, 0)">
The ParallaxLayer's [Texture2D] repeating. Useful for creating an infinite scrolling background. If an axis is set to [code]0[/code], the [Texture2D] will not be repeated. The interval, in pixels, at which the [ParallaxLayer] is drawn repeatedly. Useful for creating an infinitely scrolling background. If an axis is set to [code]0[/code], the [ParallaxLayer] will be drawn only once along that direction.
If the length of the viewport axis is bigger than twice the repeated axis size, it will not repeat infinitely, as the parallax layer only draws 2 instances of the texture at any given time. [b]Note:[/b] If you want the repetition to pixel-perfect match a [Texture2D] displayed by a child node, you should account for any scale applied to the texture when defining this interval. For example, if you use a child [Sprite2D] scaled to [code]0.5[/code] to display a 600x600 texture, and want this sprite to be repeated continuously horizontally, you should set the mirroring to [code]Vector2(300, 0)[/code].
[b]Note:[/b] Despite its name, the texture will not be mirrored, it will simply be repeated. [b]Note:[/b] If the length of the viewport axis is bigger than twice the repeated axis size, it will not repeat infinitely, as the parallax layer only draws 2 instances of the layer at any given time. The visibility window is calculated from the parent [ParallaxBackground]'s position, not the layer's own position. So, if you use mirroring, [b]do not[/b] change the [ParallaxLayer] position relative to its parent. Instead, if you need to adjust the background's position, set the [member CanvasLayer.offset] property in the parent [ParallaxBackground].
[b]Note:[/b] Despite the name, the layer will not be mirrored, it will only be repeated.
</member> </member>
<member name="motion_offset" type="Vector2" setter="set_motion_offset" getter="get_motion_offset" default="Vector2(0, 0)"> <member name="motion_offset" type="Vector2" setter="set_motion_offset" getter="get_motion_offset" default="Vector2(0, 0)">
The ParallaxLayer's offset relative to the parent ParallaxBackground's [member ParallaxBackground.scroll_offset]. The ParallaxLayer's offset relative to the parent ParallaxBackground's [member ParallaxBackground.scroll_offset].