I'm moving a sprite from one image point to another using a boolean switch, currently the movement is instantaneous - is there any way to make it a smooth transition?
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The typical way would be to set the sprite's position using the system expression lerp(a,b,x), where a & b are your required positions & x is the interpolation factor (which goes from 0-1, & is usually a var that increases with time).
There's also Rex's MoveTo behavior - http://c2rexplugins.weebly.com/rex_moveto.html - which is what I'd recommend since it has a lot of handy event options.
Or this is a quite advanced tweening plugin: viewtopic.php?t=70700&start=0