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_COORD_MAX

LV_COORD_MIN

LV_SIZE_CONTENT

LV_PCT_STORED_MAX

LV_PCT_POS_MAX

LV_PCT(x)

LV_COORD_IS_PCT(x)

LV_COORD_GET_PCT(x)

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

参数:

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

参数:

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

int32_t lv_area_get_width(const lv_area_t *area_p)

Get the width of an area

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

int32_t lv_area_get_height(const lv_area_t *area_p)

Get the height of an area

参数:: area_p -- pointer to an area
返回:: 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

参数:

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

参数:

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

uint32_t lv_area_get_size(const lv_area_t *area_p)

Return with area of an area (x * y)

参数:: area_p -- pointer to an area
返回:: 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)

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 another

参数:

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 *point, int32_t angle, int32_t scale_x, int32_t scale_y, const lv_point_t *pivot, bool zoom_first)

Transform a point

参数:

point -- pointer to a point
angle -- angle with 0.1 resolutions (123 means 12.3°)
scale_x -- horizontal zoom, 256 means 100%
scale_y -- vertical zoom, 256 means 100%
pivot -- pointer to the pivot point of the transformation
zoom_first -- true: zoom first and rotate after that; else: opposite order

void lv_point_array_transform(lv_point_t *points, size_t count, int32_t angle, int32_t scale_x, int32_t scale_y, const lv_point_t *pivot, bool zoom_first)

Transform an array of points

参数:

points -- pointer to an array of points
count -- number of points in the array
angle -- angle with 0.1 resolutions (123 means 12.3°)
scale_x -- horizontal zoom, 256 means 100%
scale_y -- vertical zoom, 256 means 100%
pivot -- pointer to the pivot point of the transformation
zoom_first -- true: zoom first and rotate after that; else: opposite order

lv_point_t lv_point_from_precise(const lv_point_precise_t *p)

lv_point_precise_t lv_point_to_precise(const lv_point_t *p)

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

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

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

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

int32_t lv_pct(int32_t x)

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

参数:: x -- the percentage (0..1000)
返回:: a coordinate that stores the percentage

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