Difference between revisions of "Math.distance"
From GiderosMobile
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=== Return values === | === Return values === | ||
'''Returns''' (number) the distance between the two points<br/> | '''Returns''' (number) the distance between the two points<br/> | ||
| + | |||
| + | === Example === | ||
| + | <source lang="lua"> | ||
| + | local mydist = 256 | ||
| + | function LevelX:onEnterFrame(e) | ||
| + | -- player position | ||
| + | posx, posy = self.player1.body:getPosition() | ||
| + | -- for perfs | ||
| + | for k, v in pairs(self.myobjects) do -- k=sprite, v=box2d body | ||
| + | local x1, y1 = v:getPosition() | ||
| + | if math.distance(x1, y1, posx, posy) > mydist then | ||
| + | k:setVisible(false) | ||
| + | else | ||
| + | k:setVisible(true) | ||
| + | end | ||
| + | end | ||
| + | end | ||
| + | </source> | ||
{{Math}} | {{Math}} | ||
Revision as of 01:28, 23 November 2021
Available since: Gideros 2020.9
Class: math
Description
Returns the distance betwen two points.
(number) = math.distance(x1,y1,z1,x2,y2,z2)
(number) = math.distance({x1,y1,z1},{x2,y2,z2})
(number) = math.distance({x=x1,y=y1,z=z1},{x=x2,y=y2,z=z2})
Parameters
x1: (number) X component of the first point
y1: (number) Y component of the first point
z1: (number) Z component of the first point optional
x2: (number) X component of the second point
y2: (number) Y component of the second point
z2: (number) Z component of the second point optional
Return values
Returns (number) the distance between the two points
Example
local mydist = 256
function LevelX:onEnterFrame(e)
-- player position
posx, posy = self.player1.body:getPosition()
-- for perfs
for k, v in pairs(self.myobjects) do -- k=sprite, v=box2d body
local x1, y1 = v:getPosition()
if math.distance(x1, y1, posx, posy) > mydist then
k:setVisible(false)
else
k:setVisible(true)
end
end
end
- Math
- Math.abs
- Math.acos
- Math.asin
- Math.atan
- Math.atan2
- Math.ceil
- Math.clamp
- Math.cos
- Math.cosh
- Math.cross
- Math.deg
- Math.distance
- Math.distances
- Math.dot
- Math.edge
- Math.exp
- Math.fft
- Math.floor
- Math.fmod
- Math.frexp
- Math.ifft
- Math.inside
- Math.ldexp
- Math.length
- Math.log
- Math.log10
- Math.max
- Math.min
- Math.modf
- Math.nearest
- Math.noise
- Math.normalize
- Math.pow
- Math.rad
- Math.random
- Math.randomseed
- Math.raycast
- Math.round
- Math.sign
- Math.sin
- Math.sinh
- Math.sqrt
- Math.tan
- Math.tanh
