How to save a previous mouse position

Processing Coding Questions
2

use an ArrayList

How To

Here is an arraylist, you want this before setup()

ArrayList<PVector> listMousePositions = new ArrayList<PVector>();

To add to the arraylist (this could be in the function mousePressed()):

listMousePositions .add(new PVector(mouseX,mouseY));

Read value

PVector pv = listMousePositions.get(2);

display all:

for(PVector pv : listMousePositions ) {

   point (pv.x,pv.y); 

}

OR

for(int i=0; i<listMousePositions.size()-2; ++) {
      PVector pv1 = listMousePositions.get(i); 
      PVector pv2 = listMousePositions.get(i+1); 
      line  (pv1.x,pv1.y,
             pv2.x,pv2.y ); 
}

Set value

listMousePositions.set(int, new PVector(mouseX,mouseY));

(text from the forum)

Chrisir

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