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114 lines
2.8 KiB
C++
114 lines
2.8 KiB
C++
// Ryzom - MMORPG Framework <http://dev.ryzom.com/projects/ryzom/>
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// Copyright (C) 2010 Winch Gate Property Limited
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//
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Affero General Public License as
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// published by the Free Software Foundation, either version 3 of the
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// License, or (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Affero General Public License for more details.
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//
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// You should have received a copy of the GNU Affero General Public License
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// along with this program. If not, see <http://www.gnu.org/licenses/>.
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#ifndef RY_AREA_GEOMETRY_H
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#define RY_AREA_GEOMETRY_H
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template<class T>
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struct CAreaCoords
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{
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CAreaCoords(){}
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CAreaCoords(T x, T y)
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:X(x),Y(y){}
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T X;
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T Y;
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CAreaCoords<T> &operator*=(float scalar)
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{
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X = T ( scalar * X);
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Y = T ( scalar * Y);
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return *this;
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}
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};
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template<class T>
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class CAreaQuad
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{
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public:
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bool contains( CAreaCoords<T> point )const
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{
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uint32 nNbIntersection = 0;
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for (uint i = 0; i < 4; ++i)
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{
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const CAreaCoords<T> &p1 = Vertices[i];
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const CAreaCoords<T> &p2 = Vertices[(i+1)%4];
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if ( p1.Y - point.Y < T(0) && p2.Y-point.Y < T(0) )
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continue;
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if ( p1.Y-point.Y > T(0) && p2.Y-point.Y > T(0) )
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continue;
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T xinter = (sint32)( p1.X + (p2.X-p1.X) * ( double(point.Y - p1.Y) / double( p2.Y - p1.Y ) ) );
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if (xinter > point.X)
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++nNbIntersection;
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}
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if ((nNbIntersection&1) == 1) // odd intersections so the vertex is inside
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return true;
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else
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return false;
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}
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CAreaCoords<T> Vertices [4];
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};
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template<class T>
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class CAreaRect
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{
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public:
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///from a quad : build the bounding rect
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CAreaRect<T>( const CAreaQuad<T> & quad )
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{
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Point.X = quad.Vertices[0].X;
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Point.Y = quad.Vertices[0].Y;
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CAreaCoords<T> topRight(quad.Vertices[0].X,quad.Vertices[0].Y);
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for ( uint i = 1; i < 3; i++ )
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{
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if ( Point.X > quad.Vertices[i].X )
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Point.X = quad.Vertices[i].X;
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else if ( topRight.X < quad.Vertices[i].X )
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topRight.X = quad.Vertices[i].X;
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if ( Point.Y > quad.Vertices[i].Y )
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Point.Y = quad.Vertices[i].Y;
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else if ( topRight.Y < quad.Vertices[i].Y )
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topRight.Y = quad.Vertices[i].Y;
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}
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Width = topRight.X - Point.X;
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Height = topRight.Y - Point.Y;
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}
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CAreaCoords<T> center()
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{
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return CAreaCoords<T> ( Point.X + Width / 2, Point.Y + Height / 2 );
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}
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/// bottom left point
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CAreaCoords<T> Point;
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///width
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T Width;
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T Height;
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};
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#endif // RY_AREA_GEOMETRY_H
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/* End of area_geometry.h */
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