diff --git a/examples/widgets/chart/lv_example_chart_3.c b/examples/widgets/chart/lv_example_chart_3.c index dd882e07b5..478bf6e1de 100644 --- a/examples/widgets/chart/lv_example_chart_3.c +++ b/examples/widgets/chart/lv_example_chart_3.c @@ -27,27 +27,37 @@ static void event_cb(lv_event_t * e) int32_t * y_array = lv_chart_get_y_array(chart, ser); int32_t value = y_array[id]; - char buf[16]; - lv_snprintf(buf, sizeof(buf), LV_SYMBOL_DUMMY"$%d", value); - + /*Draw a rectangle above the clicked point*/ + lv_layer_t * layer = lv_event_get_layer(e); lv_draw_rect_dsc_t draw_rect_dsc; lv_draw_rect_dsc_init(&draw_rect_dsc); draw_rect_dsc.bg_color = lv_color_black(); draw_rect_dsc.bg_opa = LV_OPA_50; draw_rect_dsc.radius = 3; - draw_rect_dsc.bg_image_src = buf; - draw_rect_dsc.bg_image_recolor = lv_color_white(); lv_area_t chart_obj_coords; lv_obj_get_coords(chart, &chart_obj_coords); - lv_area_t a; - a.x1 = chart_obj_coords.x1 + p.x - 20; - a.x2 = chart_obj_coords.x1 + p.x + 20; - a.y1 = chart_obj_coords.y1 + p.y - 30; - a.y2 = chart_obj_coords.y1 + p.y - 10; + lv_area_t rect_area; + rect_area.x1 = chart_obj_coords.x1 + p.x - 20; + rect_area.x2 = chart_obj_coords.x1 + p.x + 20; + rect_area.y1 = chart_obj_coords.y1 + p.y - 30; + rect_area.y2 = chart_obj_coords.y1 + p.y - 10; + lv_draw_rect(layer, &draw_rect_dsc, &rect_area); - lv_layer_t * layer = lv_event_get_layer(e); - lv_draw_rect(layer, &draw_rect_dsc, &a); + /*Draw the value as label to the center of the rectangle*/ + char buf[16]; + lv_snprintf(buf, sizeof(buf), LV_SYMBOL_DUMMY"$%d", value); + + lv_draw_label_dsc_t draw_label_dsc; + lv_draw_label_dsc_init(&draw_label_dsc); + draw_label_dsc.color = lv_color_white(); + draw_label_dsc.text = buf; + draw_label_dsc.text_local = 1; + draw_label_dsc.align = LV_TEXT_ALIGN_CENTER; + lv_area_t label_area = rect_area; + lv_area_set_height(&label_area, lv_font_get_line_height(draw_label_dsc.font)); + lv_area_align(&rect_area, &label_area, LV_ALIGN_CENTER, 0, 0); + lv_draw_label(layer, &draw_label_dsc, &label_area); ser = lv_chart_get_series_next(chart, ser); }