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[lua] Port of fix for tangents at position 0 in PathConstraint. See #1198.

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This commit is contained in:
badlogic 2018-10-26 17:22:18 +02:00
parent 7e86c3ff36
commit a3ae6a049b
1 changed files with 13 additions and 2 deletions
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15
spine-lua/PathConstraint.lua
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@ -532,7 +532,12 @@ function PathConstraint:addAfterPosition(p, temp, i, out, o)
end
function PathConstraint:addCurvePosition(p, x1, y1, cx1, cy1, cx2, cy2, x2, y2, out, o, tangents)
if p == 0 or (p ~= p) then p = 0.0001 end
if p == 0 or (p ~= p) then
out[o + 1] = x1
out[o + 2] = y1
out[o + 3] = math_atan2(cy1 - y1, cx1 - x1)
return;
end
local tt = p * p
local ttt = tt * p
local u = 1 - p
@ -546,7 +551,13 @@ function PathConstraint:addCurvePosition(p, x1, y1, cx1, cy1, cx2, cy2, x2, y2,
local y = y1 * uuu + cy1 * uut3 + cy2 * utt3 + y2 * ttt
out[o + 1] = x
out[o + 2] = y
if tangents then out[o + 3] = math_atan2(y - (y1 * uu + cy1 * ut * 2 + cy2 * tt), x - (x1 * uu + cx1 * ut * 2 + cx2 * tt)) end
if tangents then
if p < 0.001 then
out[o + 3] = math_atan2(cy1 - y1, cx1 - x1)
else
out[o + 3] = math_atan2(y - (y1 * uu + cy1 * ut * 2 + cy2 * tt), x - (x1 * uu + cx1 * ut * 2 + cx2 * tt))
end
end
end
return PathConstraint