dashLines.2dpy

def Init():
   # --- author : jamesc

   STR.SetFParam0Name("Fade")
   STR.SetFParam1Name("Spread")
   STR.SetFParam2Name("Speed")
   GLB.slots = STR.GetMaxSlots()
   GLB.xmode = 0
   # ---    accent : XOR
   # ---    trigger : randomize
   
   GLB.NUM_OBJS = 12
   GLB.objs = [{} for i in range(GLB.NUM_OBJS)]
   def randomAllObjs(objs):
      for i in range(GLB.NUM_OBJS):
         objs[i].update({'xpos' : np.random.randint(low=0, high=320), 'ypos' : np.random.randint(low=0, high=240), 'xdir' :np.random.random() * 8.0, 'ydir' : np.random.random() * 8.0 , 'size' : np.random.randint(low=8, high=64), 'r' : np.random.random(), 'g' : np.random.random(), 'b' : np.random.random(), 'dasha' : np.random.randint(4,40), 'dashb' : np.random.randint(3,30), 'dashc' : np.random.randint(10,30), 'stroke' : np.random.randint(4,20), }  ) 
         objs[i]['xdir'] = objs[i]['xdir'] * -1 if (np.random.randint(0,2) ) else 1
         objs[i]['ydir'] = objs[i]['ydir'] * -1 if (np.random.randint(0,2) ) else 1
   GLB.randomAllObjs = randomAllObjs

   randomAllObjs(GLB.objs)

   # --- clear screen
   cr.set_source_rgba(0,0,0,1)
   cr.rectangle(0,0,320,240)
   cr.fill()
     
   def update(objs, f1, f2, a, xmode): 
      for i in range(GLB.NUM_OBJS):
         if (a) and (i > 7):
            cr.set_operator(cairo.OPERATOR_XOR)

         cr.set_line_width(objs[i]['stroke'] * 3.)
         cr.set_source_rgb(objs[i]['r'], objs[i]['g'], objs[i]['b'] )
         cr.set_dash([objs[i]['dasha'] * f1 + 1. , objs[i]['dashb'], objs[i]['dashc']])

         cr.move_to(160,objs[i]['ypos'])  
         cr.line_to(320,objs[i]['ypos'])  
         cr.stroke()
         cr.move_to(160,objs[i]['ypos'])  
         cr.line_to(0,objs[i]['ypos'])  
         cr.stroke()

         objs[i]['xpos'] = objs[i]['xpos'] + objs[i]['xdir'] * f2
         if (objs[i]['xpos'] > 320) :
            if (a) :
               objs[i]['xpos'] = 0
            else :
               objs[i]['xpos'] = 320
               objs[i]['xdir'] =  objs[i]['xdir'] * -1

         elif (objs[i]['xpos'] < 0) :
            if (a) :
               objs[i]['xpos'] = 320
            else :
               objs[i]['xpos'] = 0
               objs[i]['xdir'] =  objs[i]['xdir'] * -1
            
         objs[i]['ypos'] =  objs[i]['ypos'] + objs[i]['ydir'] * f2
         if (objs[i]['ypos'] > 240) :
            if (a) :
               objs[i]['ypos'] = 0
            else :
               objs[i]['ypos'] =  240
               objs[i]['ydir'] = objs[i]['ydir'] * -1
         elif (objs[i]['ypos'] < 0) :
            if (a) :
               objs[i]['ypos'] = 240
            else :
               objs[i]['ypos'] = 0
               objs[i]['ydir'] =  objs[i]['ydir'] * -1
   GLB.update = update


def Render(cr):
   acc = STR.CheckAccent()
   trig = STR.CheckTrigger()
   f0 = STR.F0()
   f1 = STR.F1()
   f2 = STR.F2()
   # --- clear screen
   cr.set_source_rgba(0,0,0,f0) 
   cr.rectangle(0,0,320,240)
   cr.fill()

   if trig:
      GLB.xmode = 1 if GLB.xmode==0 else 0

   if GLB.xmode:
      GLB.randomAllObjs(GLB.objs)
      GLB.xmode = 0

   GLB.update(GLB.objs, f1, f2, acc, GLB.xmode)