util.math.cos

Syntax

local result = util.math.cos(
    angle
)

Parameters

Type	Name	Description
`float`	angle	Angle in radians

Returns

Type	Name	Description
`float`	result	Cosine of angle, in the range [-1, 1]

Examples

Cosine of 0 is 1

local result = util.math.cos(0)

core.engine.print("info", result) -- 1.0

Cosine of pi is -1

local result = util.math.cos(util.math.pi)

core.engine.print("info", result) -- -1.0

Cosine of a 60 degree angle

local result = util.math.cos(util.math.rad(60))

core.engine.print("info", result) -- 0.5

Cosine of a 90 degree angle

local result = util.math.cos(util.math.rad(90))

core.engine.print("info", result) -- 0.0

Generate a point on a unit circle

local angle = util.math.rad(45)
local pos_x = util.math.cos(angle)
local pos_y = util.math.sin(angle)

core.engine.print("info", pos_x, pos_y) -- 0.70711  0.70711

Oscillate a value back and forth

local elapsed = 1.0
local value = util.math.cos(elapsed*util.math.pi)

core.engine.print("info", value) -- -1.0

Compute cosine for each cardinal angle

for _, deg in ipairs({0, 90, 180, 270, 360}) do
    core.engine.print("info", deg, util.math.cos(util.math.rad(deg)))
end

Syntax

Parameters

Returns

Examples

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