DiagonalToLShapedLines.h

/*
The MIT License (MIT)

Copyright (c) 2020 Richard Bamford

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/

class Line
{
public:
    Line()
    {
        
    }
    
    Line(Vector2 start, Vector2 end) : m_start(start), m_end(end)
    {
        
    }
    
    Vector2 GetStart()
    {
        return this->m_start;
    }
    
    Vector2 GetEnd()
    {
        return this->m_end;
    }
    
    static void SubdivideRightAngled(Line * input, Line (*output)[4])
    {
        Vector2 targetNodeVec = input->GetStart();
        Vector2 sourceNodeVec = input->GetEnd();
        
        Vector2 midpointDifference = Vector2Subtract(targetNodeVec, sourceNodeVec);
        midpointDifference = Vector2Divide(midpointDifference, 2.0f);
        
        Vector2 midpointPosition = Vector2Add(sourceNodeVec, midpointDifference);
        
        // Source to midpoint.
        
        Vector2 sourceToMidpointCorner {
            sourceNodeVec.x + midpointDifference.x,
            sourceNodeVec.y
        };
        
        Vector2 a = sourceNodeVec;
        Vector2 b = sourceToMidpointCorner;
        Vector2 c = midpointPosition;
        
        
        
        // End to midpoint.
        Vector2 endToMidpointCorner {
            targetNodeVec.x - midpointDifference.x,
            targetNodeVec.y
        };
        
        Vector2 a1 = targetNodeVec;
        Vector2 b1 = endToMidpointCorner;
        Vector2 c1 = midpointPosition;
        
        
        (*output)[0] = Line(a, b);
        (*output)[1] = Line(b, c);
        (*output)[2] = Line(a1, b1);
        (*output)[3] = Line(b1, c1);
    }
    
private:
    Vector2 m_start;
    Vector2 m_end;
};