Coords.h

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/******************************************************************************
 * Copyright 2022 Kristiyan Manev (University of Manchester)
 *
 * Licensed under the Apache License, Version 2.0(the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *****************************************************************************/
 
#ifndef COORDS_H
#define COORDS_H
 
#include<algorithm>   // min, max
 
struct Coord2D
{
    int row;
    int col;
};
 
struct Rect2D
{
    Coord2D position;
    Coord2D size;
};
namespace rect {
    inline Rect2D getOverlap(Rect2D r1, Rect2D r2){
        Rect2D retRect;
        retRect.position.col = std::max(r1.position.col, r2.position.col);
        retRect.size.col = std::min((r1.position.col + r1.size.col), (r2.position.col + r2.size.col)) - retRect.position.col;
        if(0 > retRect.size.col)
            retRect.size.col = 0;
        
        retRect.position.row = std::max(r1.position.row, r2.position.row);
        retRect.size.row = std::min((r1.position.row + r1.size.row), (r2.position.row + r2.size.row)) - retRect.position.row;
        if(0 > retRect.size.row)
            retRect.size.row = 0;
        
        return retRect;
    }
    inline bool empty(Rect2D r){
        return (0 >= r.size.row || 0 >= r.size.col);
    }
}
 
#endif //COORDS_H