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Fix T103868: render uv transform gizmo even if it has zero area 

Change the 2D Gizmo drawing function to provide a usable transform matrix,
if it would otherwise be degenerate.

Differential Revision: https://developer.blender.org/D17113
This commit is contained in:
Chris Blackbourn 2023-01-27 17:05:15 +13:00
parent 34a6591a07
commit 6c8db7c22b
Notes: blender-bot 2023-02-14 03:21:27 +01:00 
Referenced by issue #103868, UV Editor, Manipulator disappears if AABB of selection has zero area.
1 changed files with 5 additions and 2 deletions
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7
source/blender/editors/transform/transform_gizmo_2d.c
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@ -604,8 +604,11 @@ static void gizmo2d_xform_draw_prepare(const bContext *C, wmGizmoGroup *gzgroup)
UI_view2d_view_to_region_m4(&region->v2d, ggd->cage->matrix_space);
/* Define the bounding box of the gizmo in the offset transform matrix. */
unit_m4(ggd->cage->matrix_offset);
ggd->cage->matrix_offset[0][0] = (ggd->max[0] - ggd->min[0]);
ggd->cage->matrix_offset[1][1] = (ggd->max[1] - ggd->min[1]);
const float min_gizmo_pixel_size = 0.001f; /* Draw Gizmo larger than this many pixels. */
const float min_scale_axis_x = min_gizmo_pixel_size / ggd->cage->matrix_space[0][0];
const float min_scale_axis_y = min_gizmo_pixel_size / ggd->cage->matrix_space[1][1];
ggd->cage->matrix_offset[0][0] = max_ff(min_scale_axis_x, ggd->max[0] - ggd->min[0]);
ggd->cage->matrix_offset[1][1] = max_ff(min_scale_axis_y, ggd->max[1] - ggd->min[1]);
ScrArea *area = CTX_wm_area(C);