lv_area.h

Defines

_LV_COORD_TYPE_SHIFT

_LV_COORD_TYPE_MASK

_LV_COORD_TYPE(x)

_LV_COORD_PLAIN(x)

_LV_COORD_TYPE_PX

_LV_COORD_TYPE_SPEC

_LV_COORD_TYPE_PX_NEG

LV_COORD_IS_PX(x)

LV_COORD_IS_SPEC(x)

LV_COORD_SET_SPEC(x)

LV_PCT(x)

LV_COORD_IS_PCT(x)

LV_COORD_GET_PCT(x)

LV_SIZE_CONTENT

LV_COORD_MAX

LV_COORD_MIN

Typedefs

typedef _lv_align_t lv_align_t

typedef _lv_dir_t lv_dir_t

Enums

enum _lv_align_t

Alignments

Values:

enumerator LV_ALIGN_DEFAULT

enumerator LV_ALIGN_TOP_LEFT

enumerator LV_ALIGN_TOP_MID

enumerator LV_ALIGN_TOP_RIGHT

enumerator LV_ALIGN_BOTTOM_LEFT

enumerator LV_ALIGN_BOTTOM_MID

enumerator LV_ALIGN_BOTTOM_RIGHT

enumerator LV_ALIGN_LEFT_MID

enumerator LV_ALIGN_RIGHT_MID

enumerator LV_ALIGN_CENTER

enumerator LV_ALIGN_OUT_TOP_LEFT

enumerator LV_ALIGN_OUT_TOP_MID

enumerator LV_ALIGN_OUT_TOP_RIGHT

enumerator LV_ALIGN_OUT_BOTTOM_LEFT

enumerator LV_ALIGN_OUT_BOTTOM_MID

enumerator LV_ALIGN_OUT_BOTTOM_RIGHT

enumerator LV_ALIGN_OUT_LEFT_TOP

enumerator LV_ALIGN_OUT_LEFT_MID

enumerator LV_ALIGN_OUT_LEFT_BOTTOM

enumerator LV_ALIGN_OUT_RIGHT_TOP

enumerator LV_ALIGN_OUT_RIGHT_MID

enumerator LV_ALIGN_OUT_RIGHT_BOTTOM

enum _lv_dir_t

Values:

enumerator LV_DIR_NONE

enumerator LV_DIR_LEFT

enumerator LV_DIR_RIGHT

enumerator LV_DIR_TOP

enumerator LV_DIR_BOTTOM

enumerator LV_DIR_HOR

enumerator LV_DIR_VER

enumerator LV_DIR_ALL

Functions

void lv_area_set(lv_area_t *area_p, int32_t x1, int32_t y1, int32_t x2, int32_t y2)

Initialize an area

Parameters:

area_p -- pointer to an area
x1 -- left coordinate of the area
y1 -- top coordinate of the area
x2 -- right coordinate of the area
y2 -- bottom coordinate of the area

static inline void lv_area_copy(lv_area_t *dest, const lv_area_t *src)

Copy an area

Parameters:

dest -- pointer to the destination area
src -- pointer to the source area

static inline int32_t lv_area_get_width(const lv_area_t *area_p)

Get the width of an area

Parameters:: area_p -- pointer to an area
Returns:: the width of the area (if x1 == x2 -> width = 1)

static inline int32_t lv_area_get_height(const lv_area_t *area_p)

Get the height of an area

Parameters:: area_p -- pointer to an area
Returns:: the height of the area (if y1 == y2 -> height = 1)

void lv_area_set_width(lv_area_t *area_p, int32_t w)

Set the width of an area

Parameters:

area_p -- pointer to an area
w -- the new width of the area (w == 1 makes x1 == x2)

void lv_area_set_height(lv_area_t *area_p, int32_t h)

Set the height of an area

Parameters:

area_p -- pointer to an area
h -- the new height of the area (h == 1 makes y1 == y2)

void _lv_area_set_pos(lv_area_t *area_p, int32_t x, int32_t y)

Set the position of an area (width and height will be kept)

Parameters:

area_p -- pointer to an area
x -- the new x coordinate of the area
y -- the new y coordinate of the area

uint32_t lv_area_get_size(const lv_area_t *area_p)

Return with area of an area (x * y)

Parameters:: area_p -- pointer to an area
Returns:: size of area

void lv_area_increase(lv_area_t *area, int32_t w_extra, int32_t h_extra)

void lv_area_move(lv_area_t *area, int32_t x_ofs, int32_t y_ofs)

bool _lv_area_intersect(lv_area_t *res_p, const lv_area_t *a1_p, const lv_area_t *a2_p)

Get the common parts of two areas

Parameters:

res_p -- pointer to an area, the result will be stored her
a1_p -- pointer to the first area
a2_p -- pointer to the second area

Returns:

false: the two area has NO common parts, res_p is invalid

int8_t _lv_area_diff(lv_area_t res_p[], const lv_area_t *a1_p, const lv_area_t *a2_p)

Get resulting sub areas after removing the common parts of two areas from the first area

Parameters:

res_p -- pointer to an array of areas with a count of 4, the resulting areas will be stored here
a1_p -- pointer to the first area
a2_p -- pointer to the second area

Returns:

number of results (max 4) or -1 if no intersect

void _lv_area_join(lv_area_t *a_res_p, const lv_area_t *a1_p, const lv_area_t *a2_p)

Join two areas into a third which involves the other two

Parameters:

a_res_p -- pointer to an area, the result will be stored here
a1_p -- pointer to the first area
a2_p -- pointer to the second area

bool _lv_area_is_point_on(const lv_area_t *a_p, const lv_point_t *p_p, int32_t radius)

Check if a point is on an area

Parameters:

a_p -- pointer to an area
p_p -- pointer to a point
radius -- radius of area (e.g. for rounded rectangle)

Returns:

false:the point is out of the area

bool _lv_area_is_on(const lv_area_t *a1_p, const lv_area_t *a2_p)

Check if two area has common parts

Parameters:

a1_p -- pointer to an area.
a2_p -- pointer to an other area

Returns:

false: a1_p and a2_p has no common parts

bool _lv_area_is_in(const lv_area_t *ain_p, const lv_area_t *aholder_p, int32_t radius)

Check if an area is fully on an other

Parameters:

ain_p -- pointer to an area which could be in 'aholder_p'
aholder_p -- pointer to an area which could involve 'ain_p'
radius -- radius of aholder_p (e.g. for rounded rectangle)

Returns:

true: ain_p is fully inside aholder_p

bool _lv_area_is_out(const lv_area_t *aout_p, const lv_area_t *aholder_p, int32_t radius)

Check if an area is fully out of an other

Parameters:

aout_p -- pointer to an area which could be in 'aholder_p'
aholder_p -- pointer to an area which could involve 'ain_p'
radius -- radius of aholder_p (e.g. for rounded rectangle)

Returns:

true: aout_p is fully outside aholder_p

bool _lv_area_is_equal(const lv_area_t *a, const lv_area_t *b)

Check if 2 area is the same

Parameters:

a -- pointer to an area
b -- pointer to another area

void lv_area_align(const lv_area_t *base, lv_area_t *to_align, lv_align_t align, int32_t ofs_x, int32_t ofs_y)

Align an area to an other

Parameters:

base -- an area where the other will be aligned
to_align -- the area to align
align -- LV_ALIGN_...
ofs_x -- X offset
ofs_y -- Y offset

void lv_point_transform(lv_point_t *p, int32_t angle, int32_t scale_x, int32_t scale_y, const lv_point_t *pivot, bool zoom_first)

static inline lv_point_t lv_point_from_precise(const lv_point_precise_t *p)

static inline lv_point_precise_t lv_point_to_precise(const lv_point_t *p)

static inline void lv_point_set(lv_point_t *p, int32_t x, int32_t y)

static inline void lv_point_precise_set(lv_point_precise_t *p, lv_value_precise_t x, lv_value_precise_t y)

static inline void lv_point_swap(lv_point_t *p1, lv_point_t *p2)

static inline void lv_point_precise_swap(lv_point_precise_t *p1, lv_point_precise_t *p2)

static inline int32_t lv_pct(int32_t x)

Convert a percentage value to int32_t. Percentage values are stored in special range

Parameters:: x -- the percentage (0..1000)
Returns:: a coordinate that stores the percentage

static inline int32_t lv_pct_to_px(int32_t v, int32_t base)

struct lv_point_t

#include <lv_area.h>

Represents a point on the screen.

Public Members

int32_t x

int32_t y

struct lv_point_precise_t

Public Members

lv_value_precise_t x

lv_value_precise_t y

struct lv_area_t

#include <lv_area.h>

Represents an area of the screen.

Public Members

int32_t x1

int32_t y1

int32_t x2

int32_t y2

struct lv_area_transform_cache_t

Public Members

int32_t angle_prev

int32_t sinma

int32_t cosma