def spring_DLT(x, y, base, d=15):
t_val = Terrain.GetTerrainVal(pix[x, y])
e_val = float(elevations[y][x])
diff = e_val - base
if (diff > 1):
return
if (d == 0):
return
pix[x, y] = (113, 237, 255, 255)
for tup in pixel_neighbors((x, y)):
i, j = tup
t_val = Terrain.GetTerrainVal(pix[i, j])
if (t_val != Terrain.Water() and t_val != Terrain.Ice()):
spring_DLT(i, j, base, d - 1)
