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feat(chart) send LV_EVENT_DRAW_PART_BEGIN/END before/after the division line drawing section.

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See https://forum.lvgl.io/t/how-to-add-minor-division-lines-to-a-chart/5366/15
This commit is contained in:
Gabor Kiss-Vamosi 2021-06-25 13:51:09 +02:00
parent e66b935061
commit e0ae2aa106
2 changed files with 13 additions and 3 deletions
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2
docs/widgets/extra/chart.md
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@ -140,7 +140,7 @@ The possible values of `dir` `LV_DIR_NONE/RIGHT/UP/LEFT/DOWN/HOR/VER/ALL` or th
- vertical line `clip_area`, `p1`, `p2` (points of the line), `line_dsc`, `part`
- horizontal line `clip_area`, `p1`, `p2` (points of the line), `line_dsc`, `part`
- point `clip_area`, `draw_area` (points of the line), `rect_dsc`, `part`
- `LV_PART_MAIN` (the division lines) `clip_area`, `id` (index of the line), `p1`, `p2` (points of the line), `line_dsc`, `part`
- `LV_PART_MAIN` (the division lines) `clip_area`, `id` (index of the line), `p1`, `p2` (points of the line), `line_dsc`, `part`. Besides events for every line, an event is sent before the first line and after the last line with `id=0xFFFFFFFF`, `p1 = NULL` and `p2 = NULL`. It can be used to add/remove masks, or draw special division lines.
Learn more about [Events](/overview/event).

14
src/extra/widgets/chart/lv_chart.c
View File

@ -755,6 +755,10 @@ static void draw_div_lines(lv_obj_t * obj, const lv_area_t * clip_area)
lv_obj_draw_dsc_init(&obj_draw_dsc, clip_area);
obj_draw_dsc.line_dsc = &line_dsc;
obj_draw_dsc.part = LV_PART_MAIN;
obj_draw_dsc.id = 0xFFFFFFFF;
obj_draw_dsc.p1 = NULL;
obj_draw_dsc.p2 = NULL;
lv_event_send(obj, LV_EVENT_DRAW_PART_BEGIN, &obj_draw_dsc);
lv_opa_t border_opa = lv_obj_get_style_border_opa(obj, LV_PART_MAIN);
lv_coord_t border_w = lv_obj_get_style_border_width(obj, LV_PART_MAIN);
@ -775,7 +779,7 @@ static void draw_div_lines(lv_obj_t * obj, const lv_area_t * clip_area)
}
for(i = i_start; i < i_end; i++) {
p1.y = (int32_t)((int32_t)(h - line_dsc.width) * i) / (chart->hdiv_cnt - 1);
p1.y = (int32_t)((int32_t)h * i) / (chart->hdiv_cnt - 1);
p1.y += y_ofs;
p2.y = p1.y;
@ -801,7 +805,7 @@ static void draw_div_lines(lv_obj_t * obj, const lv_area_t * clip_area)
}
for(i = i_start; i < i_end; i++) {
p1.x = (int32_t)((int32_t)(w - line_dsc.width) * i) / (chart->vdiv_cnt - 1);
p1.x = (int32_t)((int32_t)w * i) / (chart->vdiv_cnt - 1);
p1.x += x_ofs;
p2.x = p1.x;
@ -814,6 +818,12 @@ static void draw_div_lines(lv_obj_t * obj, const lv_area_t * clip_area)
lv_event_send(obj, LV_EVENT_DRAW_PART_END, &obj_draw_dsc);
}
}
obj_draw_dsc.id = 0xFFFFFFFF;
obj_draw_dsc.p1 = NULL;
obj_draw_dsc.p2 = NULL;
lv_event_send(obj, LV_EVENT_DRAW_PART_END, &obj_draw_dsc);
}
static void draw_series_line(lv_obj_t * obj, const lv_area_t * clip_area)