When applied to a text layer source text, it will show "+ / - " according to whether the point the expression is looking at is speeding up or slowing down.
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function AccelDeccel(point) { | |
xResult = ""; | |
yResult = ""; | |
pointVelocity = point.velocity; | |
pointVelocityLastFrame = point.velocityAtTime(time - thisComp.frameDuration); | |
xVelocityNow = Math.abs(pointVelocity[0]); | |
yVelocityNow = Math.abs(pointVelocity[1]); | |
xVelocityLastFrame = Math.abs(pointVelocityLastFrame[0]); | |
yVelocityLastFrame = Math.abs(pointVelocityLastFrame[1]); | |
xResult = (xVelocityNow > xVelocityLastFrame && xVelocityNow) ? "+" : (xVelocityNow < xVelocityLastFrame && xVelocityNow) ? "-" : ""; | |
yResult = (yVelocityNow > yVelocityLastFrame && yVelocityNow) ? "+" : (yVelocityNow < yVelocityLastFrame && yVelocityNow) ? "-" : ""; | |
return [ xResult, yResult ]; | |
} | |
AccelDeccel(/*pickqhip a point here, like a layer's poition property*/); |
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