Returns the current time of this tween, a float number between 0 to 1.
time() is always linear from 0 to 1, and is not affected by the easing shaper function.
Example
import megamu.shapetween.*;
Tween ani;
void setup(){
ani = new Tween(this, 2);
}
void draw(){
background(255);
ellipse(ani.time()*width, ani.position()*height, 4, 4);
}