ofxTween::map or general map question

advanced
#1

Hi,

I know that below command line will do a nice job for remapping the value with val.

float amplitude = ofxTween::map( val , 0, max_val, 0, max_remap, clamp, easeQuad, easingType );

What if I want to remap it something like to be

What would be suggestions?

#2

you have to combine two tweens. The first half would be, an easeOut, the next half would be an easeIn.

#3

@Ahbee
but that would end up declaring two different variable, isn’t it?

#4

I think I misunderstood your original question. I thought you were just trying to get a float variable to follow the bell curve path you posted. Can you give more context on your problem?

#5

No I guess you are right, but how would I combine two ofxTween ?

float amplitude = ofxTween::map( val , 0, max_val/2, 0, max_remap, clamp, easeQuad, easingType );

float amplitude = ofxTween::map( val , max_val/2, max_val, 0, max_remap, clamp, easeQuad, easingType );

This would be the result? It would overwrite the variable, isn’t it?

#6

that is not what map does. You want to use the easing function

ofxEasingExpo easing;
float amplitude;
if (time < duration/2.0) {
  amplitude = easing.easeOut(currentTime, 0, MaxAmp, duration/2.0);
}else{
  amplitude = easing.easeIn(currentTime, MaxAmp, 0, duration/2.0);
}
#7

sorry it should be

ofxEasingExpo easing;
float amplitude;
if (time < duration/2.0) {
  amplitude = easing.easeOut(currentTime, 0, MaxAmp, duration/2.0);
}else{
  amplitude = easing.easeIn(currentTime-(duration/2.0), MaxAmp, 0, duration/2.0);
}