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         attr _x: Int    # Abscisse
  20         attr _y: Int    # Ordonnée
  21
  22
  23         meth x: Int
  24         do
  25                 return _x
  26         end
  27         meth x=(i: Int)
  28         do
  29                 _x = i
  30         end
  31
  32         meth y: Int
  33         do
  34                 return _y
  35         end
  36         meth y=(i: Int)
  37         do
  38                 _y = i
  39         end
  40
  41         # Change la position d'un point
  42         meth moveto(x: Int, y: Int)
  43         do
  44                 _x = x
  45                 _y = y
  46         end
  47
  48         redef meth to_s: String
  49         do
  50                 var s = "("
  51                 s.append(_x.to_s)
  52                 s.add(':')
  53                 s.append(_y.to_s)
  54                 s.add(')')
  55                 return s
  56         end
  57
  58         redef meth ==(p)
  59         do
  60                 return not p is null and p isa Point and _x == p.x and _y == p.y
  61         end
  62
  63
  64         init
  65         do
  66         end
  67
  68         init at(x: Int, y: Int)
  69         do
  70                 moveto(x, y)
  71         end
  72
  73 end
  74
  75
  76 var p1 = new Point
  77 var p2 = new Point.at(5, 8)
  78 print(p1)               # (0,0)
  79 print(p2)               # (5,8)
  80 print(p1 == p2) # false
  81 p1.moveto(5,12)
  82 p2.y = 12
  83 print(p1 == p2) # true