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Math Functions

max​

max(X, Y)

Return the greater value of X,Y.

min​

min(x,y)

Return the smaller value of X,Y.

mid​

mid(x,y,z)

Return the middle value after X, Y, and Z sizes are arranged.

ceil​

ceil(x)

Return the integer closest to x and >=x, which is rounded up.

flr​

flr(x)

Return the integer closest to x and <=x, which is rounded down.

sin/cos​

sin(x),cos(x)

Return the sine/cosine function value of x. Note that unlike math.sin/math.cos, here y is reversed according to the screen coordinate direction.

x is the angle, corresponding to the counterclockwise direction on the screen, and the whole circle corresponds to 0..1.

For example, the far right (0 degrees) is 0, and the far left (180 degrees) is 0.5.

atan2​

atan2(dx,dy)

According to dx, dy converted to an angle (0..1).

The angle corresponds to the counterclockwise direction of the screen.

atan2(0, -1) -- 0.25

sqrt​

sqrt(x)

Calculate the square root of x, if x<0, return 0.

abs​

abs(x)

Return the absolute value of x.

sgn​

sgn(x)

Return the sign of x, if x<0 return -1, if x>=0 return 1.

band/bor/bxor/bnot/shl/shr/lshr/rotl/rotr​

bit运算

band(X, Y) -- x&Y
bor(X, Y)  -- x|y
bxor(X, Y) -- x^Y
bnot(X)    -- ~X
shl(X, N)  -- shift left, fill right with 0
shr(X, N)  -- Arithmetic shift right, fill sign bit on the left
lshr(X, N) -- logical shift right, fill left with 0
rotl(X, N) -- rotate left
rotr(X, N) -- rotate right

There is a difference between the bit operation function and the bit operation symbol. The function will not report an exception when the parameter is illegal, but the symbol operation will directly throw an exception.

rnd​

rnd(X)

Return a random number n, 0 <= n < x.

Note that the return value is not an integer, if you need an integer, use flr(rnd(x)).

If x is an array, then randomly returns an element value from table[1] to table[#table].

srand​

srand(X)

Set the pseudo-random number seed. The same seed will result in the same random sequence.