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Animation Playback Adjustment #20

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Animation Playback Adjustment #20

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c5a1b3f
FlxMath::fastSinCos (#18)
HEIHUAa Jan 25, 2026
5e1d3c3
Update FlxMath.hx (#19)
HEIHUAa Feb 10, 2026
ed89942
Animation improvement
HEIHUAa Feb 11, 2026
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2 changes: 1 addition & 1 deletion flixel/animation/FlxAnimation.hx
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Original file line number Diff line number Diff line change
Expand Up @@ -177,7 +177,7 @@ class FlxAnimation extends FlxBaseAnimation

reversed = Reversed;
paused = false;
_frameTimer = 0;
_frameTimer = -FlxG.elapsed / 2;
finished = frameDuration == 0;

var maxFrameIndex:Int = numFrames - 1;
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37 changes: 37 additions & 0 deletions flixel/math/FlxMath.hx
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Expand Up @@ -548,6 +548,43 @@ class FlxMath
return fastSin(n + 1.570796327); // sin and cos are the same, offset by pi/2
}

/**
* ~1.3x faster than calling fastSin() + fastCos() separately.
*/
public static inline function fastSinCos(angle:Float):{sin:Float, cos:Float}
{
var n = angle * 0.3183098862;

if (n > 1)
{
n -= (Math.ceil(n) >> 1) << 1;
}
else if (n < -1)
{
n += (Math.ceil(-n) >> 1) << 1;
}

var sin:Float;
if (n > 0)
{
sin = n * (3.1 + n * (0.5 + n * (-7.2 + n * 3.6)));
}
else
{
sin = n * (3.1 - n * (0.5 + n * (7.2 + n * 3.6)));
}

var cos = Math.sqrt(1 - sin * sin);

var originalN = n * Math.PI;
if (originalN < -Math.PI * 0.5 || originalN > Math.PI * 0.5)
{
cos = -cos;
}

return {sin: sin, cos: cos};
}

/**
* Hyperbolic sine.
*/
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