#include "RenderTarget.hpp"

namespace frame::render
{

    RenderTarget::RenderTarget(Size size)
        : image(size)
    {
    }

    void RenderTarget::DrawPixel(Vector const& position, Color color)
    {
        image.at(position.x, position.y) = color;
    }

    void RenderTarget::DrawLine(Vector const& start,
                                Vector const& end,
                                Color color)
    {
        auto const deltaX = std::abs(start.x - end.x);
        auto const deltaY = std::abs(start.y - end.y);

        auto const rX = start.x < end.x ? 1 : -1;
        auto const rY = start.y < end.y ? 1 : -1;

        auto pos = start;
        auto E   = 2 * deltaY - deltaX;

        DrawPixel(pos, color);

        while(pos != end)
        {
            if(E <= 0)
            {
                pos.x += rX;

                E += 2 * deltaY;
            } else
            {
                pos.x += rX;
                pos.y += rY;

                E += 2 * deltaY - 2 * deltaX;
            }
            DrawPixel(pos, color);
        }
    }

} // namespace frame::render