1 Reply Latest reply on Apr 20, 2009 7:11 PM by FONGHO

# Constant speed movement of object

Hi,

I am trying to get an object to track my mouse on press and i am using a tween. However, the nature of the tween is such that the time taken for the object would move would always be constant despite the distance.

I would like to make the object travel at a constant speed regardless of the distance. Is it correct for me to use a tween? If not what should I be using?

The code for my tween is as follows.

map_mc.tracker_mc._x = map_mc._xmouse;
map_mc.tracker_mc._y = map_mc._ymouse;
startx = map_mc.crosshair_mc._x;
endx = map_mc.tracker_mc._x;
starty = map_mc.crosshair_mc._y;
endy = map_mc.tracker_mc._y;

trackTweenx = new Tween(map_mc.crosshair_mc, "_x", Regular.easeIn, startx, endx, spd, true);
trackTweeny = new Tween(map_mc.crosshair_mc, "_y", Regular.easeIn, starty, endy, spd, true);

map_mc.tracker_mc is the mouse cursor that would appear when onPress while the map_mc.crosshair_mc is the object that would track my cursor's movements.

Thanks.

• ###### 1. Re: Constant speed movement of object

spd = distance/time

because you want speed constant, calculate your tween distance:

dist=Math.sqrt((startx-endx)*(startx-endx)+(starty-endy*(starty-endy));

and use the following time in your tween:

time = dist/spd;

trackTweenx = new Tween(map_mc.crosshair_mc, "_x", Regular.easeIn, startx, endx, time, true);

trackTweeny = new Tween(map_mc.crosshair_mc, "_y", Regular.easeIn, starty, endy, time, true);