Description
What MCU/Processor/Board and compiler are you using?
PC Simulator
What LVGL version are you using?
LVGL release/v8.2
pc_simulator_sdl_eclipse release/v8.2
What do you want to achieve?
Mask out an arc on a complex/gradient image. Such as the image below.
What have you tried so far?
I have tried to set the arc image source using lv_style_set_arc_img_src(lv_style_t * style, const void * value), but the image was not visible. So I tried using a small test image with no transparent pixels and it seems to be redrawing the image centered on the knobs position.
Code to reproduce
{
static lv_style_t style;
lv_style_init(&style);
lv_style_set_arc_rounded(&style, 0);
lv_style_set_arc_width(&style, 40);
LV_IMG_DECLARE(img_test);
lv_style_set_arc_img_src(&style, &img_test);
speed_arc = lv_arc_create(lv_scr_act());
lv_obj_center(speed_arc);
// lv_obj_add_style(speed_arc, &style, LV_PART_MAIN);
lv_obj_add_style(speed_arc, &style, LV_PART_INDICATOR);
lv_obj_remove_style(speed_arc, NULL, LV_PART_KNOB);
lv_obj_set_size(speed_arc, 380, 380);
lv_arc_set_rotation(speed_arc, 150);
lv_arc_set_bg_angles(speed_arc, 0, 240);
lv_arc_set_range(speed_arc, 0, 240);
lv_arc_set_value(speed_arc, 120);
}