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fix(chart): fix saving the address of a local variable in lv_example_chart_3()

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fixes https://forum.lvgl.io/t/two-questions-about-the-chart-control/18590/2
This commit is contained in:
Gabor Kiss-Vamosi
2024-10-28 19:04:39 +01:00
parent 253981ae82
commit 37ea110238
1 changed files with 22 additions and 12 deletions
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34
examples/widgets/chart/lv_example_chart_3.c
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@@ -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);
}