lv_arc.h

Enums

enum lv_arc_mode_t

Values:

enumerator LV_ARC_MODE_NORMAL
enumerator LV_ARC_MODE_SYMMETRICAL
enumerator LV_ARC_MODE_REVERSE

Functions

lv_obj_t *lv_arc_create(lv_obj_t *parent)

Create an arc object

参数:

parent -- pointer to an object, it will be the parent of the new arc

返回:

pointer to the created arc

void lv_arc_set_start_angle(lv_obj_t *obj, lv_value_precise_t start)

Set the start angle of an arc. 0 deg: right, 90 bottom, etc.

参数:

  • obj -- pointer to an arc object

  • start -- the start angle. (if LV_USE_FLOAT is enabled it can be fractional too.)

void lv_arc_set_end_angle(lv_obj_t *obj, lv_value_precise_t end)

Set the end angle of an arc. 0 deg: right, 90 bottom, etc.

参数:

  • obj -- pointer to an arc object

  • end -- the end angle (if LV_USE_FLOAT is enabled it can be fractional too.)

void lv_arc_set_angles(lv_obj_t *obj, lv_value_precise_t start, lv_value_precise_t end)

Set the start and end angles

参数:

  • obj -- pointer to an arc object

  • start -- the start angle (if LV_USE_FLOAT is enabled it can be fractional too.)

  • end -- the end angle (if LV_USE_FLOAT is enabled it can be fractional too.)

void lv_arc_set_bg_start_angle(lv_obj_t *obj, lv_value_precise_t start)

Set the start angle of an arc background. 0 deg: right, 90 bottom, etc.

参数:

  • obj -- pointer to an arc object

  • start -- the start angle (if LV_USE_FLOAT is enabled it can be fractional too.)

void lv_arc_set_bg_end_angle(lv_obj_t *obj, lv_value_precise_t end)

Set the start angle of an arc background. 0 deg: right, 90 bottom etc.

参数:

  • obj -- pointer to an arc object

  • end -- the end angle (if LV_USE_FLOAT is enabled it can be fractional too.)

void lv_arc_set_bg_angles(lv_obj_t *obj, lv_value_precise_t start, lv_value_precise_t end)

Set the start and end angles of the arc background

参数:

  • obj -- pointer to an arc object

  • start -- the start angle (if LV_USE_FLOAT is enabled it can be fractional too.)

  • end -- the end angle (if LV_USE_FLOAT is enabled it can be fractional too.)

void lv_arc_set_rotation(lv_obj_t *obj, int32_t rotation)

Set the rotation for the whole arc

参数:

  • obj -- pointer to an arc object

  • rotation -- rotation angle

void lv_arc_set_mode(lv_obj_t *obj, lv_arc_mode_t type)

Set the type of arc.

参数:

  • obj -- pointer to arc object

  • type -- arc's mode

void lv_arc_set_value(lv_obj_t *obj, int32_t value)

Set a new value on the arc

参数:

  • obj -- pointer to an arc object

  • value -- new value

void lv_arc_set_range(lv_obj_t *obj, int32_t min, int32_t max)

Set minimum and the maximum values of an arc

参数:

  • obj -- pointer to the arc object

  • min -- minimum value

  • max -- maximum value

void lv_arc_set_change_rate(lv_obj_t *obj, uint32_t rate)

Set a change rate to limit the speed how fast the arc should reach the pressed point.

参数:

  • obj -- pointer to an arc object

  • rate -- the change rate

void lv_arc_set_knob_offset(lv_obj_t *obj, int32_t offset)

Set an offset angle for the knob

参数:

  • obj -- pointer to an arc object

  • offset -- knob offset from main arc in degrees

lv_value_precise_t lv_arc_get_angle_start(lv_obj_t *obj)

Get the start angle of an arc.

参数:

obj -- pointer to an arc object

返回:

the start angle 0..360

lv_value_precise_t lv_arc_get_angle_end(lv_obj_t *obj)

Get the end angle of an arc.

参数:

obj -- pointer to an arc object

返回:

the end angle 0..360

lv_value_precise_t lv_arc_get_bg_angle_start(lv_obj_t *obj)

Get the start angle of an arc background.

参数:

obj -- pointer to an arc object

返回:

the start angle 0..360

lv_value_precise_t lv_arc_get_bg_angle_end(lv_obj_t *obj)

Get the end angle of an arc background.

参数:

obj -- pointer to an arc object

返回:

the end angle 0..360

int32_t lv_arc_get_value(const lv_obj_t *obj)

Get the value of an arc

参数:

obj -- pointer to an arc object

返回:

the value of the arc

int32_t lv_arc_get_min_value(const lv_obj_t *obj)

Get the minimum value of an arc

参数:

obj -- pointer to an arc object

返回:

the minimum value of the arc

int32_t lv_arc_get_max_value(const lv_obj_t *obj)

Get the maximum value of an arc

参数:

obj -- pointer to an arc object

返回:

the maximum value of the arc

lv_arc_mode_t lv_arc_get_mode(const lv_obj_t *obj)

Get whether the arc is type or not.

参数:

obj -- pointer to an arc object

返回:

arc's mode

int32_t lv_arc_get_rotation(const lv_obj_t *obj)

Get the rotation for the whole arc

参数:

obj -- pointer to an arc object

返回:

arc's current rotation

int32_t lv_arc_get_knob_offset(const lv_obj_t *obj)

Get the current knob angle offset

参数:

obj -- pointer to an arc object

返回:

arc's current knob offset

void lv_arc_align_obj_to_angle(const lv_obj_t *obj, lv_obj_t *obj_to_align, int32_t r_offset)

Align an object to the current position of the arc (knob)

参数:

  • obj -- pointer to an arc object

  • obj_to_align -- pointer to an object to align

  • r_offset -- consider the radius larger with this value (< 0: for smaller radius)

void lv_arc_rotate_obj_to_angle(const lv_obj_t *obj, lv_obj_t *obj_to_rotate, int32_t r_offset)

Rotate an object to the current position of the arc (knob)

参数:

  • obj -- pointer to an arc object

  • obj_to_rotate -- pointer to an object to rotate

  • r_offset -- consider the radius larger with this value (< 0: for smaller radius)

Variables

const lv_obj_class_t lv_arc_class