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「GIL - 座標演算 (point2)」(2007/05/10 (木) 13:11:54) の最新版変更点

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2次元座標の演算

** ソース
 #include <iostream>
 #include <string>
 #include <boost/format.hpp>
 #include <boost/gil/utilities.hpp>
 using namespace std;
 using namespace boost;
 using namespace boost::gil;

 string show( string expression, point2<int> p )
 {
     return str( format( "%s = (%3d, %3d)" ) % expression % p.x % p[1] );
 }

 int main()
 {
     point2<int> p1( 10, 100 );
     point2<int> p2;

     p2.x = 20;
     p2.y = 200;

     cout << "num_dimensions = " << p1.num_dimensions << endl;
     cout << show( "p1", p1 ) << endl;
     cout << show( "p2", p2 ) << endl;
     cout << show( "p1 + p2", p1 + p2 ) << endl;
     cout << show( "p1 - p2", p1 - p2 ) << endl;
 }

** 実行結果
 num_dimensions = 2
 p1 = ( 10, 100)
 p2 = ( 20, 200)
 p1 + p2 = ( 30, 300)
 p1 - p2 = (-10, -100)

2次元座標の演算

** ソース
 #include <iostream>
 #include <string>
 #include <boost/format.hpp>
 #include <boost/gil/utilities.hpp>
 using namespace std;
 using namespace boost;
 using namespace boost::gil;
 
 string show( string expression, point2<int> p )
 {
     return str( format( "%s = (%3d, %3d)" ) % expression % p.x % p[1] );
 }
 
 int main()
 {
     point2<int> p1( 10, 100 );
     point2<int> p2;
 
     p2.x = 20;
     p2.y = 200;
 
     cout << "num_dimensions = " << p1.num_dimensions << endl;
     cout << show( "p1", p1 ) << endl;
     cout << show( "p2", p2 ) << endl;
     cout << show( "p1 + p2", p1 + p2 ) << endl;
     cout << show( "p1 - p2", p1 - p2 ) << endl;
 }

** 実行結果
 num_dimensions = 2
 p1 = ( 10, 100)
 p2 = ( 20, 200)
 p1 + p2 = ( 30, 300)
 p1 - p2 = (-10, -100)