tests/example_point.nit

   1 # This file is part of NIT ( http://www.nitlanguage.org ).
   2 #
   3 # Copyright 2004-2008 Jean Privat <jean@pryen.org>
   4 #
   5 # Licensed under the Apache License, Version 2.0 (the "License");
   6 # you may not use this file except in compliance with the License.
   7 # You may obtain a copy of the License at
   8 #
   9 #     http://www.apache.org/licenses/LICENSE-2.0
  10 #
  11 # Unless required by applicable law or agreed to in writing, software
  12 # distributed under the License is distributed on an "AS IS" BASIS,
  13 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  14 # See the License for the specific language governing permissions and
  15 # limitations under the License.
  16
  17 class Point
  18 private
  19         var x: Int = 0  # Abscisse
  20         var y: Int = 0  # Ordonnée
  21
  22         # Change la position d'un point
  23         fun moveto(x: Int, y: Int)
  24         do
  25                 _x = x
  26                 _y = y
  27         end
  28
  29         redef fun to_s: String
  30         do
  31                 var s = "({_x}:{_y})"
  32                 return s
  33         end
  34
  35         redef fun ==(p)
  36         do
  37                 return p isa Point and _x == p.x and _y == p.y
  38         end
  39
  40
  41         init at(x: Int, y: Int)
  42         do
  43                 moveto(x, y)
  44         end
  45
  46 end
  47
  48
  49 var p1 = new Point
  50 var p2 = new Point.at(5, 8)
  51 print(p1)               # (0,0)
  52 print(p2)               # (5,8)
  53 print(p1 == p2) # false
  54 p1.moveto(5,12)
  55 p2.y = 12
  56 print(p1 == p2) # true