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Clarify Geometry.offset_polygon_2d regarding vertices translation

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The method is used to either inflate or deflate a polygon.
For translating/transforming a polygon, use `Transform2D.xform`.
This commit is contained in:
Andrii Doroshenko (Xrayez) 2020-05-01 17:51:26 +03:00
parent 34e011c8a5
commit 19b72da35d
1 changed files with 7 additions and 0 deletions
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7
doc/classes/Geometry2D.xml
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@ -200,6 +200,13 @@
Inflates or deflates [code]polygon[/code] by [code]delta[/code] units (pixels). If [code]delta[/code] is positive, makes the polygon grow outward. If [code]delta[/code] is negative, shrinks the polygon inward. Returns an array of polygons because inflating/deflating may result in multiple discrete polygons. Returns an empty array if [code]delta[/code] is negative and the absolute value of it approximately exceeds the minimum bounding rectangle dimensions of the polygon.
Each polygon's vertices will be rounded as determined by [code]join_type[/code], see [enum PolyJoinType].
The operation may result in an outer polygon (boundary) and inner polygon (hole) produced which could be distinguished by calling [method is_polygon_clockwise].
[b]Note:[/b] To translate the polygon's vertices specifically, use the [method Transform2D.xform] method:
[codeblock]
var polygon = PackedVector2Array([Vector2(0, 0), Vector2(100, 0), Vector2(100, 100), Vector2(0, 100)])
var offset = Vector2(50, 50)
polygon = Transform2D(0, offset).xform(polygon)
print(polygon) # prints [Vector2(50, 50), Vector2(150, 50), Vector2(150, 150), Vector2(50, 150)]
[/codeblock]
</description>
</method>
<method name="offset_polyline">