javascript - passively tween a property with tweenlite -


i'd able passively tween property on object, during tween can update object , tweenlite carry on.

for example, following code tween coordinates in object 0 15 on 15 seconds. whilst happening, want update x , y variables of target.position, , cannot tweenlite seems "hog" object until it's done (as in, until 15 seconds have passed).

// target.position starts @ { x:0, y: 0 } tweenlite.to(target.position, 15, {     x: 15,     y: 15,     ease: power4.easeout })  // examples sake i'd following, yet not have effect settimeout(function(){ target.position.x += 10 }, 1000) settimeout(function(){ target.position.y += 15 }, 2500) settimeout(function(){ target.position.x -= 17 }, 7500)

i solved question using modifiersplugin tahir ahmed recommended.

the modifiersplugin gives 2 values in callback, it's current value , running total of tween, have named cx , rt. returned in callback used tweenlite in next call, , given again rt. handy can let modifiersplugin after it's own running total, tween x , y yet not update target.position.. pretty useful.

all work out change needed, delta, call dx , add target position, , passively tweening variable possible!

my code looks this:

// dummy example data target.position.x = 200 target.position.y = 300  x = 300 y = 400  tweenlite.to({ x: target.position.x, y: target.position.y }, 0.3, {     x: x,     y: y,     ease: power4.easeout,     modifiers: {         x: function(cx, rt) {              // delta (current change in) value running total - current             const dx = cx - rt.x             target.position.x += dx              // update running total current delta             rt.x += dx             return rt.x         },         y: function(cy, rt) {             const dy = cy - rt.y             target.position.y += dy             rt.y += dy             return rt.y         }     } })

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