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blender-archive/source/blender/editors/gpencil/gpencil_weight_paint.c

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/*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software Foundation,
* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
* The Original Code is Copyright (C) 2015, Blender Foundation
* This is a new part of Blender
* Brush based operators for editing Grease Pencil strokes
*/
/** \file
* \ingroup edgpencil
*/
#include "MEM_guardedalloc.h"
#include "BLI_blenlib.h"
#include "BLI_math.h"
#include "BLT_translation.h"
#include "DNA_brush_types.h"
#include "DNA_gpencil_types.h"
#include "BKE_brush.h"
#include "BKE_colortools.h"
#include "BKE_context.h"
#include "BKE_deform.h"
#include "BKE_gpencil.h"
#include "BKE_main.h"
#include "BKE_object_deform.h"
#include "BKE_report.h"
#include "DNA_meshdata_types.h"
#include "WM_api.h"
#include "WM_types.h"
#include "RNA_access.h"
#include "RNA_define.h"
#include "UI_view2d.h"
#include "ED_gpencil.h"
#include "ED_screen.h"
#include "ED_view3d.h"
#include "DEG_depsgraph.h"
#include "DEG_depsgraph_query.h"
#include "gpencil_intern.h"
/* ************************************************ */
/* General Brush Editing Context */
#define GP_SELECT_BUFFER_CHUNK 256
/* Grid of Colors for Smear. */
typedef struct tGP_Grid {
/** Lower right corner of rectangle of grid cell. */
float bottom[2];
/** Upper left corner of rectangle of grid cell. */
float top[2];
/** Average Color */
float color[4];
/** Total points included. */
int totcol;
} tGP_Grid;
/* List of points affected by brush. */
typedef struct tGP_Selected {
/** Referenced stroke. */
bGPDstroke *gps;
/** Point index in points array. */
int pt_index;
/** Position */
int pc[2];
/** Color */
float color[4];
} tGP_Selected;
/* Context for brush operators */
typedef struct tGP_BrushWeightpaintData {
struct Main *bmain;
Scene *scene;
Object *object;
ARegion *region;
/* Current GPencil datablock */
bGPdata *gpd;
Brush *brush;
/* Space Conversion Data */
GP_SpaceConversion gsc;
/* Is the brush currently painting? */
bool is_painting;
/* Start of new paint */
bool first;
/* Is multi-frame editing enabled, and are we using falloff for that? */
bool is_multiframe;
bool use_multiframe_falloff;
/* active vertex group */
int vrgroup;
/* Brush Runtime Data: */
/* - position and pressure
* - the *_prev variants are the previous values
*/
float mval[2], mval_prev[2];
float pressure, pressure_prev;
/* - Effect 2D vector */
float dvec[2];
/* - multi-frame falloff factor. */
float mf_falloff;
/* brush geometry (bounding box). */
rcti brush_rect;
/* Temp data to save selected points */
/** Stroke buffer. */
tGP_Selected *pbuffer;
/** Number of elements currently used in cache. */
int pbuffer_used;
/** Number of total elements available in cache. */
int pbuffer_size;
} tGP_BrushWeightpaintData;
/* Ensure the buffer to hold temp selected point size is enough to save all points selected. */
static tGP_Selected *gpencil_select_buffer_ensure(tGP_Selected *buffer_array,
int *buffer_size,
int *buffer_used,
const bool clear)
{
tGP_Selected *p = NULL;
/* By default a buffer is created with one block with a predefined number of free slots,
* if the size is not enough, the cache is reallocated adding a new block of free slots.
* This is done in order to keep cache small and improve speed. */
if (*buffer_used + 1 > *buffer_size) {
if ((*buffer_size == 0) || (buffer_array == NULL)) {
p = MEM_callocN(sizeof(struct tGP_Selected) * GP_SELECT_BUFFER_CHUNK, __func__);
*buffer_size = GP_SELECT_BUFFER_CHUNK;
}
else {
*buffer_size += GP_SELECT_BUFFER_CHUNK;
p = MEM_recallocN(buffer_array, sizeof(struct tGP_Selected) * *buffer_size);
}
if (p == NULL) {
*buffer_size = *buffer_used = 0;
}
buffer_array = p;
}
/* clear old data */
if (clear) {
*buffer_used = 0;
if (buffer_array != NULL) {
memset(buffer_array, 0, sizeof(tGP_Selected) * *buffer_size);
}
}
return buffer_array;
}
/* Brush Operations ------------------------------- */
/* Compute strength of effect. */
static float brush_influence_calc(tGP_BrushWeightpaintData *gso, const int radius, const int co[2])
{
Brush *brush = gso->brush;
/* basic strength factor from brush settings */
float influence = brush->alpha;
/* use pressure? */
if (brush->gpencil_settings->flag & GP_BRUSH_USE_PRESSURE) {
influence *= gso->pressure;
}
/* distance fading */
int mval_i[2];
round_v2i_v2fl(mval_i, gso->mval);
float distance = (float)len_v2v2_int(mval_i, co);
influence *= 1.0f - (distance / max_ff(radius, 1e-8));
/* Apply Brush curve. */
float brush_fallof = BKE_brush_curve_strength(brush, distance, (float)radius);
influence *= brush_fallof;
/* apply multi-frame falloff */
influence *= gso->mf_falloff;
/* return influence */
return influence;
}
/* Compute effect vector for directional brushes. */
static void brush_calc_dvec_2d(tGP_BrushWeightpaintData *gso)
{
gso->dvec[0] = (float)(gso->mval[0] - gso->mval_prev[0]);
gso->dvec[1] = (float)(gso->mval[1] - gso->mval_prev[1]);
normalize_v2(gso->dvec);
}
/* ************************************************ */
/* Brush Callbacks
* This section defines the callbacks used by each brush to perform their magic.
* These are called on each point within the brush's radius. */
/* Draw Brush */
static bool brush_draw_apply(tGP_BrushWeightpaintData *gso,
bGPDstroke *gps,
int pt_index,
const int radius,
const int co[2])
{
/* create dvert */
BKE_gpencil_dvert_ensure(gps);
MDeformVert *dvert = gps->dvert + pt_index;
float inf;
/* Compute strength of effect */
inf = brush_influence_calc(gso, radius, co);
/* need a vertex group */
if (gso->vrgroup == -1) {
if (gso->object) {
BKE_object_defgroup_add(gso->object);
DEG_relations_tag_update(gso->bmain);
gso->vrgroup = 0;
}
}
else {
bDeformGroup *defgroup = BLI_findlink(&gso->object->defbase, gso->vrgroup);
if (defgroup->flag & DG_LOCK_WEIGHT) {
return false;
}
}
/* Get current weight and blend. */
MDeformWeight *dw = BKE_defvert_ensure_index(dvert, gso->vrgroup);
if (dw) {
dw->weight = interpf(gso->brush->weight, dw->weight, inf);
CLAMP(dw->weight, 0.0f, 1.0f);
}
return true;
}
/* ************************************************ */
/* Header Info */
static void gp_weightpaint_brush_header_set(bContext *C)
{
ED_workspace_status_text(C, TIP_("GPencil Weight Paint: LMB to paint | RMB/Escape to Exit"));
}
/* ************************************************ */
/* Grease Pencil Weight Paint Operator */
/* Init/Exit ----------------------------------------------- */
static bool gp_weightpaint_brush_init(bContext *C, wmOperator *op)
{
Scene *scene = CTX_data_scene(C);
ToolSettings *ts = CTX_data_tool_settings(C);
Object *ob = CTX_data_active_object(C);
Paint *paint = &ts->gp_weightpaint->paint;
/* set the brush using the tool */
tGP_BrushWeightpaintData *gso;
/* setup operator data */
gso = MEM_callocN(sizeof(tGP_BrushWeightpaintData), "tGP_BrushWeightpaintData");
op->customdata = gso;
gso->bmain = CTX_data_main(C);
gso->brush = paint->brush;
BKE_curvemapping_initialize(gso->brush->curve);
gso->is_painting = false;
gso->first = true;
gso->pbuffer = NULL;
gso->pbuffer_size = 0;
gso->pbuffer_used = 0;
gso->gpd = ED_gpencil_data_get_active(C);
gso->scene = scene;
gso->object = ob;
if (ob) {
gso->vrgroup = ob->actdef - 1;
if (!BLI_findlink(&ob->defbase, gso->vrgroup)) {
gso->vrgroup = -1;
}
}
else {
gso->vrgroup = -1;
}
gso->region = CTX_wm_region(C);
/* Multiframe settings. */
gso->is_multiframe = (bool)GPENCIL_MULTIEDIT_SESSIONS_ON(gso->gpd);
gso->use_multiframe_falloff = (ts->gp_sculpt.flag & GP_SCULPT_SETT_FLAG_FRAME_FALLOFF) != 0;
/* Init multi-edit falloff curve data before doing anything,
* so we won't have to do it again later. */
if (gso->is_multiframe) {
BKE_curvemapping_initialize(ts->gp_sculpt.cur_falloff);
}
/* Setup space conversions. */
gp_point_conversion_init(C, &gso->gsc);
/* Update header. */
gp_weightpaint_brush_header_set(C);
return true;
}
static void gp_weightpaint_brush_exit(bContext *C, wmOperator *op)
{
tGP_BrushWeightpaintData *gso = op->customdata;
/* Disable headerprints. */
ED_workspace_status_text(C, NULL);
/* Free operator data */
MEM_SAFE_FREE(gso->pbuffer);
MEM_SAFE_FREE(gso);
op->customdata = NULL;
}
/* Poll callback for stroke weight paint operator. */
static bool gp_weightpaint_brush_poll(bContext *C)
{
/* NOTE: this is a bit slower, but is the most accurate... */
return CTX_DATA_COUNT(C, editable_gpencil_strokes) != 0;
}
/* Helper to save the points selected by the brush. */
static void gp_save_selected_point(tGP_BrushWeightpaintData *gso,
bGPDstroke *gps,
int index,
int pc[2])
{
tGP_Selected *selected;
bGPDspoint *pt = &gps->points[index];
/* Ensure the array to save the list of selected points is big enough. */
gso->pbuffer = gpencil_select_buffer_ensure(
gso->pbuffer, &gso->pbuffer_size, &gso->pbuffer_used, false);
selected = &gso->pbuffer[gso->pbuffer_used];
selected->gps = gps;
selected->pt_index = index;
copy_v2_v2_int(selected->pc, pc);
copy_v4_v4(selected->color, pt->vert_color);
gso->pbuffer_used++;
}
/* Select points in this stroke and add to an array to be used later. */
static void gp_weightpaint_select_stroke(tGP_BrushWeightpaintData *gso,
bGPDstroke *gps,
const float diff_mat[4][4])
{
GP_SpaceConversion *gsc = &gso->gsc;
rcti *rect = &gso->brush_rect;
Brush *brush = gso->brush;
const int radius = (brush->flag & GP_BRUSH_USE_PRESSURE) ? gso->brush->size * gso->pressure :
gso->brush->size;
bGPDstroke *gps_active = (gps->runtime.gps_orig) ? gps->runtime.gps_orig : gps;
bGPDspoint *pt_active = NULL;
bGPDspoint *pt1, *pt2;
bGPDspoint *pt = NULL;
int pc1[2] = {0};
int pc2[2] = {0};
int i;
int index;
bool include_last = false;
/* Check if the stroke collide with brush. */
if (!ED_gpencil_stroke_check_collision(gsc, gps, gso->mval, radius, diff_mat)) {
return;
}
if (gps->totpoints == 1) {
bGPDspoint pt_temp;
pt = &gps->points[0];
gp_point_to_parent_space(gps->points, diff_mat, &pt_temp);
gp_point_to_xy(gsc, gps, &pt_temp, &pc1[0], &pc1[1]);
pt_active = (pt->runtime.pt_orig) ? pt->runtime.pt_orig : pt;
/* do boundbox check first */
if ((!ELEM(V2D_IS_CLIPPED, pc1[0], pc1[1])) && BLI_rcti_isect_pt(rect, pc1[0], pc1[1])) {
/* only check if point is inside */
int mval_i[2];
round_v2i_v2fl(mval_i, gso->mval);
if (len_v2v2_int(mval_i, pc1) <= radius) {
/* apply operation to this point */
if (pt_active != NULL) {
gp_save_selected_point(gso, gps_active, 0, pc1);
}
}
}
}
else {
/* Loop over the points in the stroke, checking for intersections
* - an intersection means that we touched the stroke
*/
for (i = 0; (i + 1) < gps->totpoints; i++) {
/* Get points to work with */
pt1 = gps->points + i;
pt2 = gps->points + i + 1;
bGPDspoint npt;
gp_point_to_parent_space(pt1, diff_mat, &npt);
gp_point_to_xy(gsc, gps, &npt, &pc1[0], &pc1[1]);
gp_point_to_parent_space(pt2, diff_mat, &npt);
gp_point_to_xy(gsc, gps, &npt, &pc2[0], &pc2[1]);
/* Check that point segment of the boundbox of the selection stroke */
if (((!ELEM(V2D_IS_CLIPPED, pc1[0], pc1[1])) && BLI_rcti_isect_pt(rect, pc1[0], pc1[1])) ||
((!ELEM(V2D_IS_CLIPPED, pc2[0], pc2[1])) && BLI_rcti_isect_pt(rect, pc2[0], pc2[1]))) {
/* Check if point segment of stroke had anything to do with
* brush region (either within stroke painted, or on its lines)
* - this assumes that linewidth is irrelevant
*/
if (gp_stroke_inside_circle(gso->mval, radius, pc1[0], pc1[1], pc2[0], pc2[1])) {
/* To each point individually... */
pt = &gps->points[i];
pt_active = (pt->runtime.pt_orig) ? pt->runtime.pt_orig : pt;
index = (pt->runtime.pt_orig) ? pt->runtime.idx_orig : i;
if (pt_active != NULL) {
gp_save_selected_point(gso, gps_active, index, pc1);
}
/* Only do the second point if this is the last segment,
* and it is unlikely that the point will get handled
* otherwise.
*
* NOTE: There is a small risk here that the second point wasn't really
* actually in-range. In that case, it only got in because
* the line linking the points was!
*/
if (i + 1 == gps->totpoints - 1) {
pt = &gps->points[i + 1];
pt_active = (pt->runtime.pt_orig) ? pt->runtime.pt_orig : pt;
index = (pt->runtime.pt_orig) ? pt->runtime.idx_orig : i + 1;
if (pt_active != NULL) {
gp_save_selected_point(gso, gps_active, index, pc2);
include_last = false;
}
}
else {
include_last = true;
}
}
else if (include_last) {
/* This case is for cases where for whatever reason the second vert (1st here)
* doesn't get included because the whole edge isn't in bounds,
* but it would've qualified since it did with the previous step
* (but wasn't added then, to avoid double-ups).
*/
pt = &gps->points[i];
pt_active = (pt->runtime.pt_orig) ? pt->runtime.pt_orig : pt;
index = (pt->runtime.pt_orig) ? pt->runtime.idx_orig : i;
if (pt_active != NULL) {
gp_save_selected_point(gso, gps_active, index, pc1);
include_last = false;
}
}
}
}
}
}
/* Apply weight paint brushes to strokes in the given frame. */
static bool gp_weightpaint_brush_do_frame(bContext *C,
tGP_BrushWeightpaintData *gso,
bGPDlayer *gpl,
bGPDframe *gpf,
const float diff_mat[4][4])
{
Object *ob = CTX_data_active_object(C);
char tool = gso->brush->gpencil_weight_tool;
const int radius = (gso->brush->flag & GP_BRUSH_USE_PRESSURE) ?
gso->brush->size * gso->pressure :
gso->brush->size;
tGP_Selected *selected = NULL;
int i;
/*---------------------------------------------------------------------
* First step: select the points affected. This step is required to have
* all selected points before apply the effect, because it could be
* required to do some step. Now is not used, but the operator is ready.
*--------------------------------------------------------------------- */
LISTBASE_FOREACH (bGPDstroke *, gps, &gpf->strokes) {
/* Skip strokes that are invalid for current view. */
if (ED_gpencil_stroke_can_use(C, gps) == false) {
continue;
}
/* Check if the color is editable. */
if (ED_gpencil_stroke_color_use(ob, gpl, gps) == false) {
continue;
}
/* Check points below the brush. */
gp_weightpaint_select_stroke(gso, gps, diff_mat);
}
/*---------------------------------------------------------------------
* Second step: Apply effect.
*--------------------------------------------------------------------- */
bool changed = false;
for (i = 0; i < gso->pbuffer_used; i++) {
changed = true;
selected = &gso->pbuffer[i];
switch (tool) {
case GPWEIGHT_TOOL_DRAW: {
brush_draw_apply(gso, selected->gps, selected->pt_index, radius, selected->pc);
changed |= true;
break;
}
default:
printf("ERROR: Unknown type of GPencil Weight Paint brush\n");
break;
}
}
/* Clear the selected array, but keep the memory allocation.*/
gso->pbuffer = gpencil_select_buffer_ensure(
gso->pbuffer, &gso->pbuffer_size, &gso->pbuffer_used, true);
return changed;
}
/* Apply brush effect to all layers. */
static bool gp_weightpaint_brush_apply_to_layers(bContext *C, tGP_BrushWeightpaintData *gso)
{
ToolSettings *ts = CTX_data_tool_settings(C);
Depsgraph *depsgraph = CTX_data_ensure_evaluated_depsgraph(C);
Object *obact = gso->object;
bool changed = false;
Object *ob_eval = (Object *)DEG_get_evaluated_id(depsgraph, &obact->id);
bGPdata *gpd = (bGPdata *)ob_eval->data;
/* Find visible strokes, and perform operations on those if hit */
LISTBASE_FOREACH (bGPDlayer *, gpl, &gpd->layers) {
/* If locked or no active frame, don't do anything. */
if ((!BKE_gpencil_layer_is_editable(gpl)) || (gpl->actframe == NULL)) {
continue;
}
/* calculate difference matrix */
float diff_mat[4][4];
BKE_gpencil_parent_matrix_get(depsgraph, obact, gpl, diff_mat);
/* Active Frame or MultiFrame? */
if (gso->is_multiframe) {
/* init multi-frame falloff options */
int f_init = 0;
int f_end = 0;
if (gso->use_multiframe_falloff) {
BKE_gpencil_frame_range_selected(gpl, &f_init, &f_end);
}
LISTBASE_FOREACH (bGPDframe *, gpf, &gpl->frames) {
/* Always do active frame; Otherwise, only include selected frames */
if ((gpf == gpl->actframe) || (gpf->flag & GP_FRAME_SELECT)) {
/* Compute multi-frame falloff factor. */
if (gso->use_multiframe_falloff) {
/* Falloff depends on distance to active frame
* (relative to the overall frame range). */
gso->mf_falloff = BKE_gpencil_multiframe_falloff_calc(
gpf, gpl->actframe->framenum, f_init, f_end, ts->gp_sculpt.cur_falloff);
}
else {
/* No falloff */
gso->mf_falloff = 1.0f;
}
/* affect strokes in this frame */
changed |= gp_weightpaint_brush_do_frame(C, gso, gpl, gpf, diff_mat);
}
}
}
else {
if (gpl->actframe != NULL) {
/* Apply to active frame's strokes */
gso->mf_falloff = 1.0f;
changed |= gp_weightpaint_brush_do_frame(C, gso, gpl, gpl->actframe, diff_mat);
}
}
}
return changed;
}
/* Calculate settings for applying brush */
static void gp_weightpaint_brush_apply(bContext *C, wmOperator *op, PointerRNA *itemptr)
{
tGP_BrushWeightpaintData *gso = op->customdata;
Brush *brush = gso->brush;
const int radius = ((brush->flag & GP_BRUSH_USE_PRESSURE) ? gso->brush->size * gso->pressure :
gso->brush->size);
float mousef[2];
int mouse[2];
bool changed = false;
/* Get latest mouse coordinates */
RNA_float_get_array(itemptr, "mouse", mousef);
gso->mval[0] = mouse[0] = (int)(mousef[0]);
gso->mval[1] = mouse[1] = (int)(mousef[1]);
gso->pressure = RNA_float_get(itemptr, "pressure");
/* Store coordinates as reference, if operator just started running */
if (gso->first) {
gso->mval_prev[0] = gso->mval[0];
gso->mval_prev[1] = gso->mval[1];
gso->pressure_prev = gso->pressure;
}
/* Update brush_rect, so that it represents the bounding rectangle of brush. */
gso->brush_rect.xmin = mouse[0] - radius;
gso->brush_rect.ymin = mouse[1] - radius;
gso->brush_rect.xmax = mouse[0] + radius;
gso->brush_rect.ymax = mouse[1] + radius;
/* Calculate 2D direction vector and relative angle. */
brush_calc_dvec_2d(gso);
changed = gp_weightpaint_brush_apply_to_layers(C, gso);
/* Updates */
if (changed) {
DEG_id_tag_update(&gso->gpd->id, ID_RECALC_GEOMETRY);
WM_event_add_notifier(C, NC_GPENCIL | ND_DATA | NA_EDITED, NULL);
}
/* Store values for next step */
gso->mval_prev[0] = gso->mval[0];
gso->mval_prev[1] = gso->mval[1];
gso->pressure_prev = gso->pressure;
gso->first = false;
}
/* Running --------------------------------------------- */
/* helper - a record stroke, and apply paint event */
static void gp_weightpaint_brush_apply_event(bContext *C, wmOperator *op, const wmEvent *event)
{
tGP_BrushWeightpaintData *gso = op->customdata;
PointerRNA itemptr;
float mouse[2];
mouse[0] = event->mval[0] + 1;
mouse[1] = event->mval[1] + 1;
/* fill in stroke */
RNA_collection_add(op->ptr, "stroke", &itemptr);
RNA_float_set_array(&itemptr, "mouse", mouse);
RNA_boolean_set(&itemptr, "pen_flip", event->ctrl != false);
RNA_boolean_set(&itemptr, "is_start", gso->first);
/* Handle pressure sensitivity (which is supplied by tablets). */
float pressure = event->tablet.pressure;
CLAMP(pressure, 0.0f, 1.0f);
RNA_float_set(&itemptr, "pressure", pressure);
/* apply */
gp_weightpaint_brush_apply(C, op, &itemptr);
}
/* reapply */
static int gp_weightpaint_brush_exec(bContext *C, wmOperator *op)
{
if (!gp_weightpaint_brush_init(C, op)) {
return OPERATOR_CANCELLED;
}
RNA_BEGIN (op->ptr, itemptr, "stroke") {
gp_weightpaint_brush_apply(C, op, &itemptr);
}
RNA_END;
gp_weightpaint_brush_exit(C, op);
return OPERATOR_FINISHED;
}
/* start modal painting */
static int gp_weightpaint_brush_invoke(bContext *C, wmOperator *op, const wmEvent *event)
{
tGP_BrushWeightpaintData *gso = NULL;
const bool is_modal = RNA_boolean_get(op->ptr, "wait_for_input");
const bool is_playing = ED_screen_animation_playing(CTX_wm_manager(C)) != NULL;
/* the operator cannot work while play animation */
if (is_playing) {
BKE_report(op->reports, RPT_ERROR, "Cannot Paint while play animation");
return OPERATOR_CANCELLED;
}
/* init painting data */
if (!gp_weightpaint_brush_init(C, op)) {
return OPERATOR_CANCELLED;
}
gso = op->customdata;
/* register modal handler */
WM_event_add_modal_handler(C, op);
/* start drawing immediately? */
if (is_modal == false) {
ARegion *region = CTX_wm_region(C);
/* apply first dab... */
gso->is_painting = true;
gp_weightpaint_brush_apply_event(C, op, event);
/* redraw view with feedback */
ED_region_tag_redraw(region);
}
return OPERATOR_RUNNING_MODAL;
}
/* painting - handle events */
static int gp_weightpaint_brush_modal(bContext *C, wmOperator *op, const wmEvent *event)
{
tGP_BrushWeightpaintData *gso = op->customdata;
const bool is_modal = RNA_boolean_get(op->ptr, "wait_for_input");
bool redraw_region = false;
bool redraw_toolsettings = false;
/* The operator can be in 2 states: Painting and Idling */
if (gso->is_painting) {
/* Painting */
switch (event->type) {
/* Mouse Move = Apply somewhere else */
case MOUSEMOVE:
case INBETWEEN_MOUSEMOVE:
/* apply brush effect at new position */
gp_weightpaint_brush_apply_event(C, op, event);
/* force redraw, so that the cursor will at least be valid */
redraw_region = true;
break;
/* Painting mbut release = Stop painting (back to idle) */
case LEFTMOUSE:
if (is_modal) {
/* go back to idling... */
gso->is_painting = false;
}
else {
/* end painting, since we're not modal */
gso->is_painting = false;
gp_weightpaint_brush_exit(C, op);
return OPERATOR_FINISHED;
}
break;
/* Abort painting if any of the usual things are tried */
case MIDDLEMOUSE:
case RIGHTMOUSE:
case EVT_ESCKEY:
gp_weightpaint_brush_exit(C, op);
return OPERATOR_FINISHED;
}
}
else {
/* Idling */
BLI_assert(is_modal == true);
switch (event->type) {
/* Painting mbut press = Start painting (switch to painting state) */
case LEFTMOUSE:
/* do initial "click" apply */
gso->is_painting = true;
gso->first = true;
gp_weightpaint_brush_apply_event(C, op, event);
break;
/* Exit modal operator, based on the "standard" ops */
case RIGHTMOUSE:
case EVT_ESCKEY:
gp_weightpaint_brush_exit(C, op);
return OPERATOR_FINISHED;
/* MMB is often used for view manipulations */
case MIDDLEMOUSE:
return OPERATOR_PASS_THROUGH;
/* Mouse movements should update the brush cursor - Just redraw the active region */
case MOUSEMOVE:
case INBETWEEN_MOUSEMOVE:
redraw_region = true;
break;
/* Change Frame - Allowed */
case EVT_LEFTARROWKEY:
case EVT_RIGHTARROWKEY:
case EVT_UPARROWKEY:
case EVT_DOWNARROWKEY:
return OPERATOR_PASS_THROUGH;
/* Camera/View Gizmo's - Allowed */
/* (See rationale in gpencil_paint.c -> gpencil_draw_modal()) */
case EVT_PAD0:
case EVT_PAD1:
case EVT_PAD2:
case EVT_PAD3:
case EVT_PAD4:
case EVT_PAD5:
case EVT_PAD6:
case EVT_PAD7:
case EVT_PAD8:
case EVT_PAD9:
return OPERATOR_PASS_THROUGH;
/* Unhandled event */
default:
break;
}
}
/* Redraw region? */
if (redraw_region) {
ED_region_tag_redraw(CTX_wm_region(C));
}
/* Redraw toolsettings (brush settings)? */
if (redraw_toolsettings) {
DEG_id_tag_update(&gso->gpd->id, ID_RECALC_GEOMETRY);
WM_event_add_notifier(C, NC_SCENE | ND_TOOLSETTINGS, NULL);
}
return OPERATOR_RUNNING_MODAL;
}
void GPENCIL_OT_weight_paint(wmOperatorType *ot)
{
/* identifiers */
ot->name = "Stroke Weight Paint";
ot->idname = "GPENCIL_OT_weight_paint";
ot->description = "Paint stroke points with a color";
/* api callbacks */
ot->exec = gp_weightpaint_brush_exec;
ot->invoke = gp_weightpaint_brush_invoke;
ot->modal = gp_weightpaint_brush_modal;
ot->cancel = gp_weightpaint_brush_exit;
ot->poll = gp_weightpaint_brush_poll;
/* flags */
ot->flag = OPTYPE_REGISTER | OPTYPE_UNDO | OPTYPE_BLOCKING;
/* properties */
PropertyRNA *prop;
prop = RNA_def_collection_runtime(ot->srna, "stroke", &RNA_OperatorStrokeElement, "Stroke", "");
RNA_def_property_flag(prop, PROP_HIDDEN | PROP_SKIP_SAVE);
prop = RNA_def_boolean(ot->srna, "wait_for_input", true, "Wait for Input", "");
RNA_def_property_flag(prop, PROP_HIDDEN | PROP_SKIP_SAVE);
}
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