Rotate hierarchy negative width bug

[WilsonPercival]

Problem description

I have a hierarchy of two sprites. The parent sprite has a negative width. The child sprite has Rotate behavior. When I start the game I see that the child sprite is confused.

I think it's similar to this: #7685

Attach a .c3p

rotate_hierarchy_negative_width_bug_r344_2s.zip

Steps to reproduce

1. Open and run the project.

Observed result

observed.mp4

Expected result

expected.mp4

More details

Affected browsers/platforms: Chrome

First affected release: Worked well in r344-2s, broke in r345b. Still doesn't work in r373-2b.

System details

View details

Platform information
Product: Construct 3 r373.2 (beta)
Browser: Chrome 120.0.6099.130
Browser engine: Chromium
Context: browser
Operating system: Windows 11
Device type: desktop
Device pixel ratio: 1.5
Logical CPU cores: 16
Approx. device memory: 8 GB
User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Safari/537.36
Language setting: en-US

Local storage
Storage quota (approx): 283 gb
Storage usage (approx): 123 mb (0%)
Persistant storage: Yes

Browser support notes
This list contains missing features that are not required, but could improve performance or user experience if supported.

Nothing is missing. Everything is OK!
WebGL information
Version string: WebGL 2.0 (OpenGL ES 3.0 Chromium)
Numeric version: 2
Supports NPOT textures: yes
Supports GPU profiling: no
Supports highp precision: yes
Vendor: Google Inc. (AMD)
Renderer: ANGLE (AMD, AMD Radeon(TM) Graphics (0x00001638) Direct3D11 vs_5_0 ps_5_0, D3D11)
Major performance caveat: no
Maximum texture size: 16384
Point size range: 1 to 1024
Extensions:

EXT_color_buffer_float
EXT_color_buffer_half_float
EXT_disjoint_timer_query_webgl2
EXT_float_blend
EXT_texture_compression_bptc
EXT_texture_compression_rgtc
EXT_texture_filter_anisotropic
EXT_texture_norm16
KHR_parallel_shader_compile
OES_draw_buffers_indexed
OES_texture_float_linear
OVR_multiview2
WEBGL_clip_cull_distance
WEBGL_compressed_texture_s3tc
WEBGL_compressed_texture_s3tc_srgb
WEBGL_debug_renderer_info
WEBGL_debug_shaders
WEBGL_lose_context
WEBGL_multi_draw
WEBGL_provoking_vertex
Audio information
System sample rate: 48000 Hz
Output channels: 2
Output interpretation: speakers
Supported decode formats:

WebM Opus (audio/webm; codecs=opus)
Ogg Opus (audio/ogg; codecs=opus)
WebM Vorbis (audio/webm; codecs=vorbis)
Ogg Vorbis (audio/ogg; codecs=vorbis)
MPEG-4 AAC (audio/mp4; codecs=mp4a.40.5)
MP3 (audio/mpeg)
FLAC (audio/flac)
PCM WAV (audio/wav; codecs=1)
Supported encode formats:

WebM Opus (audio/webm; codecs=opus)
Video information
Supported decode formats:

WebM AV1 (video/webm; codecs=av01.0.00M.08)
MP4 AV1 (video/mp4; codecs=av01.0.00M.08)
WebM VP9 (video/webm; codecs=vp9)
WebM VP8 (video/webm; codecs=vp8)
H.265 (video/mp4; codecs=hev1.1.2.L93.B0)
H.264 (video/mp4; codecs=avc1.42E01E)
Supported encode formats:

WebM AV1 (video/webm; codecs=av1)
WebM VP9 (video/webm; codecs=vp9)
WebM VP8 (video/webm; codecs=vp8)

[AshleyScirra]

The maths behind this is actually very complicated, especially as the rotating object has "transform width" enabled, so the fact its parent is mirrored is intentionally meant to affect its rotation. It is however easy to work around: uncheck either "transform width" or "transform angle" and it works correctly. Given the complexity of the problem and the easy workaround, closing.