uses classes from before. probably could use some refactoring when my mind is not fried

slidingTriangles.pde

/*
triangles sliding back and forth
*/

int w = 200;
int h = 200;
color c = color(255);
Point center = new Point(w/2,h/2);
int rad;
int counter1;
int counter2;
boolean direction1;

EqTri1 t1;
EqTri2 t2;
ArrayList<Point> trackR;
ArrayList<Point> trackL;

void setup() {
  size(w,h);
  background(0);
  frameRate(30);
  rad = 30;
  //draw two triangles
  Point apexL = new Point(w/2+(int)(rad*(Math.sin(Math.PI/3))),h/2-(int)(rad*3/2));
  Point apexR = new Point(w/2-(int)(rad*(Math.sin(Math.PI/3))),h/2+(int)(rad*3/2));
  trackR = makeLine(apexR, center);
  trackL = makeLine(center, apexL);
  counter1 = trackR.size()-1;
  counter2 = 0;
}

void draw() {
  // sorry this is so ugly; my brain is pretty shot
  background(0);
  if (counter1 == 0 && counter2 == trackL.size()-1) {
    direction1 = false;
  }
  if (counter1 == trackR.size()-1 && counter2 == 0) {
    direction1 = true;
  }
  if (direction1) {
    t2 = new EqTri2(trackR.get(counter1),rad);
    counter1--;
    t1 = new EqTri1(trackL.get(counter2),rad);
    counter2++;
  } else {
    t2 = new EqTri2(trackR.get(counter1),rad);
    counter1++;
    t1 = new EqTri1(trackL.get(counter2),rad);
    counter2--;
  }
  t1.drawT();
  t2.drawT();
}