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Shear
This function was borrowed from way's 3D dice roller demo. It performs a graphics shear (AKA "skew") coordinate transformation (which affects all following draws). It's recommended to perform a love.graphics.push before shearing.
function shear(ox, oy, xx, xy, yx, yy)
local atan2, acos, tan = math.atan2, math.acos, math.tan
local ex, ey, fx,fy = xx-ox, xy-oy, yx-ox, yy-oy
if ex*fy<ey*fx then ex,ey,fx,fy=fx,fy,ex,ey end
local e,f = (ex*ex+ey*ey)^.5, (fx*fx+fy*fy)^.5
ex,ey = ex/e, ey/e
fx,fy = fx/f, fy/f
local desiredOrientation=atan2(ey+fy,ex+fx)
local desiredAngle=acos(ex*fx+ey*fy)/2
local z=tan(desiredAngle)
local distortion=((1+z*z)/2)^.5
love.graphics.translate(ox, oy)
love.graphics.rotate(desiredOrientation)
love.graphics.scale(1, z)
love.graphics.rotate(-pi/4)
love.graphics.scale(e/distortion,f/distortion)
end
local atan2, acos, tan = math.atan2, math.acos, math.tan
local ex, ey, fx,fy = xx-ox, xy-oy, yx-ox, yy-oy
if ex*fy<ey*fx then ex,ey,fx,fy=fx,fy,ex,ey end
local e,f = (ex*ex+ey*ey)^.5, (fx*fx+fy*fy)^.5
ex,ey = ex/e, ey/e
fx,fy = fx/f, fy/f
local desiredOrientation=atan2(ey+fy,ex+fx)
local desiredAngle=acos(ex*fx+ey*fy)/2
local z=tan(desiredAngle)
local distortion=((1+z*z)/2)^.5
love.graphics.translate(ox, oy)
love.graphics.rotate(desiredOrientation)
love.graphics.scale(1, z)
love.graphics.rotate(-pi/4)
love.graphics.scale(e/distortion,f/distortion)
end
Available since LÖVE 0.8.0
This code has become obsolete as of version 0.8.0.
You can use love.graphics.shear to shear/skew the whole scene or the shear parameters in love.graphics.draw to shear/skew a single drawable.
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