implemented CvLine#[] and tested CvLine

ext/cvline.cpp

@@ -41,6 +41,8 @@ define_ruby_class()
   rb_define_method(rb_klass, "rho=", RUBY_METHOD_FUNC(rb_set_rho), 1);
   rb_define_method(rb_klass, "theta", RUBY_METHOD_FUNC(rb_theta), 0);
   rb_define_method(rb_klass, "theta=", RUBY_METHOD_FUNC(rb_set_theta), 1);
+  rb_define_method(rb_klass, "[]", RUBY_METHOD_FUNC(rb_aref), 1);
+  rb_define_method(rb_klass, "[]=", RUBY_METHOD_FUNC(rb_aset), 2);
 }
 
 VALUE
@@ -94,6 +96,52 @@ rb_set_theta(VALUE self, VALUE theta)
   return self;
 }
 
+/*
+ * call-seq:
+ *   [<i>index</i>]
+ *
+ * Return value of <i>index</i> dimension.
+ */
+VALUE
+rb_aref(VALUE self, VALUE index)
+{
+  switch (NUM2INT(index)) {
+  case 0:
+    return DBL2NUM(CVLINE(self)->rho);
+    break;
+  case 1:
+    return DBL2NUM(CVLINE(self)->theta);
+    break;
+  default:
+    rb_raise(rb_eIndexError, "index should be 0...2");
+    break;
+  }
+  return Qnil;
+}
+
+/*
+ * call-seq:
+ *   [<i>index</i>] = <i>value</i>
+ *
+ * Set value of <i>index</i> dimension to <i>value</i>
+ */
+VALUE
+rb_aset(VALUE self, VALUE index, VALUE value)
+{
+  switch (NUM2INT(index)) {
+  case 0:
+    CVLINE(self)->rho = NUM2DBL(value);
+    break;
+  case 1:
+    CVLINE(self)->theta = NUM2DBL(value);
+    break;
+  default:
+    rb_raise(rb_eIndexError, "index should be 0...2");
+    break;
+  }
+  return value;
+}
+
 VALUE
 new_object(CvLine line)
 {

ext/cvline.h

@@ -34,6 +34,8 @@ VALUE rb_rho(VALUE self);
 VALUE rb_set_rho(VALUE self, VALUE rho);
 VALUE rb_theta(VALUE self);
 VALUE rb_set_theta(VALUE self, VALUE theta);
+VALUE rb_aref(VALUE self, VALUE index);
+VALUE rb_aset(VALUE self, VALUE index, VALUE value);
 
 VALUE new_object(CvLine line);
 

test/test_cvline.rb

@@ -0,0 +1,50 @@
+#!/usr/bin/env ruby
+# -*- mode: ruby; coding: utf-8-unix -*- 
+require 'test/unit'
+require 'opencv'
+require File.expand_path(File.dirname(__FILE__)) + '/helper'
+
+include OpenCV
+
+# Tests for OpenCV::CvLine
+class TestCvLine < OpenCVTestCase
+  def setup
+    @line = CvLine.new
+  end
+  
+  def test_initialize
+    assert_not_nil(@line)
+    assert_equal(CvLine, @line.class)
+  end
+
+  def test_rho
+    @line.rho = 0.0
+    assert_in_delta(0.0, @line.rho, 0.001)
+    @line.rho = 3.14
+    assert_in_delta(3.14, @line.rho, 0.001)
+  end
+
+  def test_theta
+    @line.theta = 0.0
+    assert_in_delta(0.0, @line.theta, 0.001)
+    @line.theta = 3.14
+    assert_in_delta(3.14, @line.theta, 0.001)
+  end
+
+  def test_aref_aset
+    @line[0] = 0.0
+    @line[1] = 0.0
+    assert_in_delta(0.0, @line[0], 0.001)
+    assert_in_delta(0.0, @line[1], 0.001)
+
+    @line[0] = 3.14
+    @line[1] = 2.71
+    assert_in_delta(3.14, @line[0], 0.001)
+    assert_in_delta(2.71, @line[1], 0.001)
+
+    assert_raise(IndexError) {
+      @line[2] = 1
+    }
+  end
+end
+