lv_math.h
Defines
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LV_TRIGO_SIN_MAX
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LV_TRIGO_SHIFT
LV_TRIGO_SHIFT to normalize
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LV_BEZIER_VAL_SHIFT
log2(LV_BEZIER_VAL_MAX): used to normalize up scaled values
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LV_BEZIER_VAL_MAX
Max time in Bezier functions (not [0..1] to use integers)
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LV_BEZIER_VAL_FLOAT(f)
Convert const float number cubic-bezier values to fix-point value
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LV_ALIGN_UP(x, align)
Align up value x to align, align must be a power of two
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LV_ROUND_UP(x, round)
Round up value x to round, round can be any integer number
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LV_MIN(a, b)
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LV_MIN3(a, b, c)
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LV_MIN4(a, b, c, d)
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LV_MAX(a, b)
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LV_MAX3(a, b, c)
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LV_MAX4(a, b, c, d)
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LV_CLAMP(min, val, max)
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LV_ABS(x)
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LV_UDIV255(x)
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LV_IS_SIGNED(t)
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LV_UMAX_OF(t)
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LV_SMAX_OF(t)
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LV_MAX_OF(t)
Functions
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int32_t lv_trigo_sin(int16_t angle)
Return with sinus of an angle
- Parameters:
angle –
- Returns:
sinus of 'angle'. sin(-90) = -32767, sin(90) = 32767
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int32_t lv_trigo_cos(int16_t angle)
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int32_t lv_cubic_bezier(int32_t x, int32_t x1, int32_t y1, int32_t x2, int32_t y2)
Calculate the y value of cubic-bezier(x1, y1, x2, y2) function as specified x.
- Parameters:
x – time in range of [0..LV_BEZIER_VAL_MAX]
x1 – x of control point 1 in range of [0..LV_BEZIER_VAL_MAX]
y1 – y of control point 1 in range of [0..LV_BEZIER_VAL_MAX]
x2 – x of control point 2 in range of [0..LV_BEZIER_VAL_MAX]
y2 – y of control point 2 in range of [0..LV_BEZIER_VAL_MAX]
- Returns:
the value calculated
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int32_t lv_bezier3(int32_t t, int32_t u0, uint32_t u1, int32_t u2, int32_t u3)
Calculate a value of a Cubic Bezier function.
- Parameters:
t – time in range of [0..LV_BEZIER_VAL_MAX]
u0 – must be 0
u1 – control value 1 values in range of [0..LV_BEZIER_VAL_MAX]
u2 – control value 2 in range of [0..LV_BEZIER_VAL_MAX]
u3 – must be LV_BEZIER_VAL_MAX
- Returns:
the value calculated from the given parameters in range of [0..LV_BEZIER_VAL_MAX]
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uint16_t lv_atan2(int x, int y)
Calculate the atan2 of a vector.
- Parameters:
x –
y –
- Returns:
the angle in degree calculated from the given parameters in range of [0..360]
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void lv_sqrt(uint32_t x, lv_sqrt_res_t *q, uint32_t mask)
Get the square root of a number
- Parameters:
x – integer which square root should be calculated
q – store the result here. q->i: integer part, q->f: fractional part in 1/256 unit
mask – optional to skip some iterations if the magnitude of the root is known. Set to 0x8000 by default. If root < 16: mask = 0x80 If root < 256: mask = 0x800 Else: mask = 0x8000
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int32_t lv_sqrt32(uint32_t x)
Alternative (fast, approximate) implementation for getting the square root of an integer.
- Parameters:
x – integer which square root should be calculated
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static inline int32_t lv_sqr(int32_t x)
Calculate the square of an integer (input range is 0..32767).
- Parameters:
x – input
- Returns:
square
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int64_t lv_pow(int64_t base, int8_t exp)
Calculate the integer exponents.
- Parameters:
base –
exp –
- Returns:
base raised to the power exponent
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int32_t lv_map(int32_t x, int32_t min_in, int32_t max_in, int32_t min_out, int32_t max_out)
Get the mapped of a number given an input and output range
- Parameters:
x – integer which mapped value should be calculated
min_in – min input range
max_in – max input range
min_out – max output range
max_out – max output range
- Returns:
the mapped number
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void lv_rand_set_seed(uint32_t seed)
Set the seed of the pseudo random number generator
- Parameters:
seed – a number to initialize the random generator
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uint32_t lv_rand(uint32_t min, uint32_t max)
Get a pseudo random number in the given range
- Parameters:
min – the minimum value
max – the maximum value
- Returns:
return the random number. min <= return_value <= max
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struct lv_sqrt_res_t