lv_area.h
Defines
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LV_COORD_TYPE_SHIFT
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LV_COORD_TYPE_MASK
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LV_COORD_TYPE(x)
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LV_COORD_PLAIN(x)
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LV_COORD_TYPE_PX
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LV_COORD_TYPE_SPEC
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LV_COORD_TYPE_PX_NEG
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LV_COORD_IS_PX(x)
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LV_COORD_IS_SPEC(x)
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LV_COORD_SET_SPEC(x)
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LV_COORD_MAX
Max coordinate value
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LV_COORD_MIN
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LV_SIZE_CONTENT
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LV_PCT_STORED_MAX
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LV_PCT_POS_MAX
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LV_PCT(x)
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LV_COORD_IS_PCT(x)
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LV_COORD_GET_PCT(x)
Enums
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enum lv_align_t
Alignments
Values:
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enumerator LV_ALIGN_DEFAULT
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enumerator LV_ALIGN_TOP_LEFT
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enumerator LV_ALIGN_TOP_MID
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enumerator LV_ALIGN_TOP_RIGHT
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enumerator LV_ALIGN_BOTTOM_LEFT
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enumerator LV_ALIGN_BOTTOM_MID
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enumerator LV_ALIGN_BOTTOM_RIGHT
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enumerator LV_ALIGN_LEFT_MID
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enumerator LV_ALIGN_RIGHT_MID
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enumerator LV_ALIGN_CENTER
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enumerator LV_ALIGN_OUT_TOP_LEFT
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enumerator LV_ALIGN_OUT_TOP_MID
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enumerator LV_ALIGN_OUT_TOP_RIGHT
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enumerator LV_ALIGN_OUT_BOTTOM_LEFT
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enumerator LV_ALIGN_OUT_BOTTOM_MID
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enumerator LV_ALIGN_OUT_BOTTOM_RIGHT
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enumerator LV_ALIGN_OUT_LEFT_TOP
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enumerator LV_ALIGN_OUT_LEFT_MID
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enumerator LV_ALIGN_OUT_LEFT_BOTTOM
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enumerator LV_ALIGN_OUT_RIGHT_TOP
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enumerator LV_ALIGN_OUT_RIGHT_MID
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enumerator LV_ALIGN_OUT_RIGHT_BOTTOM
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enumerator LV_ALIGN_DEFAULT
Functions
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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
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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
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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)
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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)
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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)
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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)
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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
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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
- 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
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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
- Parameters:
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
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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
- Parameters:
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
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lv_point_t lv_point_from_precise(const lv_point_precise_t *p)
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lv_point_precise_t lv_point_to_precise(const lv_point_t *p)
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void lv_point_set(lv_point_t *p, int32_t x, int32_t y)
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void lv_point_precise_set(lv_point_precise_t *p, lv_value_precise_t x, lv_value_precise_t y)
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void lv_point_swap(lv_point_t *p1, lv_point_t *p2)
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void lv_point_precise_swap(lv_point_precise_t *p1, lv_point_precise_t *p2)
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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
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int32_t lv_pct_to_px(int32_t v, int32_t base)
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struct lv_point_t
- #include <lv_area.h>
Represents a point on the screen.
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struct lv_point_precise_t
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struct lv_area_t
- #include <lv_area.h>
Represents an area of the screen.