a = Canvas()
count = 10

drawTriangles = function(){
  a.clear()
  for( var i = 0; i < count; i++ ) {
    //a.clear()
    a.rotate( .1 * rndi(10) )
    a.polygon( a.center.x + i*10, a.center.y, 250, 3).stroke( a.randomColor() )
  }
}

a.draw = function(){
  //anything in the special 'draw' member/property function
  // will be drawn approximately 30 times per second
  // i.e. the “draw loop” or, more technically speaking, the graphics thread
  drawTriangles()
}

// just some notes on incrementing variables
// r += 0.1 equals r = r + 0.1
// r++ equals r = r + 1