Nowadays I study hard about Exercise 16-7 video average location of motion in processing

so I can control and change the black spot 

// Draw a circle based on average motion <-- under this line

but just I controlled first spot

I want control first spot and then second.. third.. sequence

like insert image, please check .jpg file :)

first obj ( red color)

.

.

and then second obj (green color)

.

.

and then third obj (blue color)

.

.

and disappear first (red color)

.

.

next obj (red color)

and now I really expecting your answer mail~~~~

Have a nice everybody

Thank you

first

second

third....next...next