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Refactor baking code for Curve2D

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The main change is to caculate tangent directly from bezier curve, without going
through discretized polyline, avoiding pitfalls of discretization. A similar refacor
had been applied to Curve3D.

The test cases for Curve2D is updated, comparing floating point with is_equal_approxmiate()
instead of `==`, in order to avoid float precision problem.
This commit is contained in:
Yaohua Xiong
2022-11-24 20:43:34 +08:00
parent 8912f3e4a7
commit 91e9ad92f5
9 changed files with 221 additions and 142 deletions
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16
doc/classes/Curve2D.xml
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@ -51,7 +51,7 @@
<return type="Vector2" />
<param index="0" name="to_point" type="Vector2" />
<description>
Returns the closest baked point (in curve's local space) to [param to_point].
Returns the closest point on baked segments (in curve's local space) to [param to_point].
[param to_point] must be in this curve's local space.
</description>
</method>
@ -94,7 +94,7 @@
</method>
<method name="sample_baked" qualifiers="const">
<return type="Vector2" />
<param index="0" name="offset" type="float" />
<param index="0" name="offset" type="float" default="0.0" />
<param index="1" name="cubic" type="bool" default="false" />
<description>
Returns a point within the curve at position [param offset], where [param offset] is measured as a pixel distance along the curve.
@ -104,13 +104,10 @@
</method>
<method name="sample_baked_with_rotation" qualifiers="const">
<return type="Transform2D" />
<param index="0" name="offset" type="float" />
<param index="0" name="offset" type="float" default="0.0" />
<param index="1" name="cubic" type="bool" default="false" />
<param index="2" name="loop" type="bool" default="true" />
<param index="3" name="lookahead" type="float" default="4.0" />
<description>
Similar to [method sample_baked], but returns [Transform2D] that includes a rotation along the curve. Returns empty transform if length of the curve is [code]0[/code].
Use [param loop] to smooth the tangent at the end of the curve. [param lookahead] defines the distance to a nearby point for calculating the tangent vector.
[codeblock]
var transform = curve.sample_baked_with_rotation(offset)
position = transform.get_origin()
@ -160,6 +157,13 @@
[param tolerance_degrees] controls how many degrees the midpoint of a segment may deviate from the real curve, before the segment has to be subdivided.
</description>
</method>
<method name="tessellate_even_length" qualifiers="const">
<return type="PackedVector2Array" />
<param index="0" name="max_stages" type="int" default="5" />
<param index="1" name="tolerance_length" type="float" default="20.0" />
<description>
</description>
</method>
</methods>
<members>
<member name="bake_interval" type="float" setter="set_bake_interval" getter="get_bake_interval" default="5.0">