sonic-bluestreak/sonic-bluestreak.love/libs/loveutils/math.lua

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2019-02-03 19:40:28 +01:00
local Math = {}
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function Math.wrap(x, startnumber, endnumber)
local delta = endnumber - startnumber
if delta < 0 then
err("endnumber must be larger than startnumber")
end
while x >= endnumber do
x = x - delta
end
while x < startnumber do
x = x + delta
end
return x
end
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function Math.sign(x)
if (x < 0) then
return -1
elseif (x > 0) then
return 1
else
return 0
end
end
function Math.round(num)
return math.floor(num + 0.5)
end
function Math.vector(x1, y1, x2, y2)
local vecx, vecy
vecx = x2 - x1
vexy = y2 - y1
return vecx, vecy
end
function Math.getMiddlePoint(x1, y1, x2, y2)
local newx, newy, vecx, vecy
vecx = math.max(x1, x2) - math.min(x1, x2)
vecy = math.max(y1, y2) - math.min(y1, y2)
newx = math.min(x1, x2) + (vecx / 2)
newy = math.min(y1, y2) + (vecy / 2)
return newx, newy
end
function Math.pointDistance(x1, y1, x2, y2)
local vecx, vecy
vecx = math.max(x1, x2) - math.min(x1, x2)
vecy = math.max(y1, y2) - math.min(y1, y2)
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return math.sqrt(vecx^2 + vecy^2)
end
function Math.pointDirection(x1,y1,x2,y2)
local vecx, vecy, angle
vecy = y2 - y1
vecx = x2 - x1
angle = math.atan2(vecy, vecx)
return angle
end
function Math.numberToString(x, length)
local length = length or 1
local string = ""
local x = x
if (x >= math.pow(10, length)) then
x = unitsNumber*10 - 1
string = string .. x
else
for i=1, (length-1) do
if (x < math.pow(10, length-i)) then
string = string .. "0"
end
end
string = string .. x
end
return string
end
function Math.floorCoord(x, y)
return math.floor(x), math.floor(y)
end
function Math.pixeliseCoord(x, y, factor)
x, y = Math.floorCoord(x / factor, y / factor)
x = x * factor
y = y * factor
return x, y
end
return Math