diff options
Diffstat (limited to 'source/blender/editors/gpencil/gpencil_utils.c')
| -rw-r--r-- | source/blender/editors/gpencil/gpencil_utils.c | 62 |
1 files changed, 52 insertions, 10 deletions
diff --git a/source/blender/editors/gpencil/gpencil_utils.c b/source/blender/editors/gpencil/gpencil_utils.c index 2b662d04f03..ed05b8be9ca 100644 --- a/source/blender/editors/gpencil/gpencil_utils.c +++ b/source/blender/editors/gpencil/gpencil_utils.c @@ -391,7 +391,16 @@ EnumPropertyItem *ED_gpencil_layers_with_new_enum_itemf(bContext *C, PointerRNA /* ******************************************************** */ /* Brush Tool Core */ -/* Check if part of stroke occurs within last segment drawn by eraser */ +/** + * Check whether a given stroke segment is inside a circular brush + * + * \param mval The current screen-space coordinates (midpoint) of the brush + * \param mvalo The previous screen-space coordinates (midpoint) of the brush (NOT CURRENTLY USED) + * \param rad The radius of the brush + * + * \param x0, y0 The screen-space x and y coordinates of the start of the stroke segment + * \param x1, y1 The screen-space x and y coordinates of the end of the stroke segment + */ bool gp_stroke_inside_circle(const int mval[2], const int UNUSED(mvalo[2]), int rad, int x0, int y0, int x1, int y1) { @@ -502,7 +511,11 @@ bGPDpalettecolor *ED_gpencil_stroke_getcolor(bGPdata *gpd, bGPDstroke *gps) /* ******************************************************** */ /* Space Conversion */ -/* Init handling for space-conversion function (from passed-in parameters) */ +/** + * Init settings for stroke point space conversions + * + * \param r_gsc: [out] The space conversion settings struct, populated with necessary params + */ void gp_point_conversion_init(bContext *C, GP_SpaceConversion *r_gsc) { ScrArea *sa = CTX_wm_area(C); @@ -538,7 +551,13 @@ void gp_point_conversion_init(bContext *C, GP_SpaceConversion *r_gsc) } } -/* convert point to parent space */ +/** + * Convert point to parent space + * + * \param pt Original point + * \param diff_mat Matrix with the difference between original parent matrix + * \param[out] r_pt Pointer to new point after apply matrix + */ void gp_point_to_parent_space(bGPDspoint *pt, float diff_mat[4][4], bGPDspoint *r_pt) { float fpt[3]; @@ -547,7 +566,9 @@ void gp_point_to_parent_space(bGPDspoint *pt, float diff_mat[4][4], bGPDspoint * copy_v3_v3(&r_pt->x, fpt); } -/* Change position relative to parent object */ +/** + * Change points position relative to parent object + */ void gp_apply_parent(bGPDlayer *gpl, bGPDstroke *gps) { bGPDspoint *pt; @@ -568,7 +589,9 @@ void gp_apply_parent(bGPDlayer *gpl, bGPDstroke *gps) } } -/* Change point position relative to parent object */ +/** + * Change point position relative to parent object + */ void gp_apply_parent_point(bGPDlayer *gpl, bGPDspoint *pt) { /* undo matrix */ @@ -583,8 +606,13 @@ void gp_apply_parent_point(bGPDlayer *gpl, bGPDspoint *pt) copy_v3_v3(&pt->x, fpt); } -/* Convert Grease Pencil points to screen-space values - * WARNING: This assumes that the caller has already checked whether the stroke in question can be drawn +/** + * Convert a Grease Pencil coordinate (i.e. can be 2D or 3D) to screenspace (2D) + * + * \param[out] r_x The screen-space x-coordinate of the point + * \param[out] r_y The screen-space y-coordinate of the point + * + * \warning This assumes that the caller has already checked whether the stroke in question can be drawn. */ void gp_point_to_xy(GP_SpaceConversion *gsc, bGPDstroke *gps, bGPDspoint *pt, int *r_x, int *r_y) @@ -628,8 +656,16 @@ void gp_point_to_xy(GP_SpaceConversion *gsc, bGPDstroke *gps, bGPDspoint *pt, } } -/* Convert Grease Pencil points to screen-space values (as floats) - * WARNING: This assumes that the caller has already checked whether the stroke in question can be drawn +/** + * Convert a Grease Pencil coordinate (i.e. can be 2D or 3D) to screenspace (2D) + * + * Just like gp_point_to_xy(), except the resulting coordinates are floats not ints. + * Use this version to solve "stair-step" artifacts which may arise when roundtripping the calculations. + * + * \param r_x: [out] The screen-space x-coordinate of the point + * \param r_y: [out] The screen-space y-coordinate of the point + * + * \warning This assumes that the caller has already checked whether the stroke in question can be drawn */ void gp_point_to_xy_fl(GP_SpaceConversion *gsc, bGPDstroke *gps, bGPDspoint *pt, float *r_x, float *r_y) @@ -688,6 +724,12 @@ void gp_point_to_xy_fl(GP_SpaceConversion *gsc, bGPDstroke *gps, bGPDspoint *pt, /** * Project screenspace coordinates to 3D-space * + * For use with editing tools where it is easier to perform the operations in 2D, + * and then later convert the transformed points back to 3D. + * + * \param screen_co: The screenspace 2D coordinates to convert to + * \param r_out: The resulting 3D coordinates of the input point + * * \note We include this as a utility function, since the standard method * involves quite a few steps, which are invariably always the same * for all GPencil operations. So, it's nicer to just centralize these. @@ -722,7 +764,7 @@ bool gp_point_xy_to_3d(GP_SpaceConversion *gsc, Scene *scene, const float screen } /** - * Apply smooth to stroke point + * Apply smooth to stroke point * \param gps Stroke to smooth * \param i Point index * \param inf Amount of smoothing to apply |