draw_vertical_line.hpp

#ifndef PASTELGFX_DRAW_VERTICAL_LINE_HPP
#define PASTELGFX_DRAW_VERTICAL_LINE_HPP

#include "pastel/gfx/drawing/draw_vertical_line.h"
#include "pastel/gfx/color/colormixer/assign_colormixer.h"

#include "pastel/sys/syscommon.h"

namespace Pastel
{

    template <typename Type, typename Image_View, typename ColorMixer>
    void drawVerticalLine(
        real x, integer y, real y2,
        const NoDeduction<Type>& color,
        const View<2, Type, Image_View>& image,
        const ColorMixer& colorMixer)
    {
        // Cull by x.

        if (x < 0 || x >= image.width())
        {
            return;
        }

        // Convert to integer coordinates.

        integer yMin = toPixelSpanPoint(y);
        integer yMax = toPixelSpanPoint(y2);

        // Cull by x.

        if (yMin >= image.height() || yMax <= 0)
        {
            return;
        }

        // Clip.

        if (yMin < 0)
        {
            yMin = 0;
        }

        if (yMax > image.height())
        {
            yMax = image.height();
        }

        using Cursor = typename Image_View::Cursor;

        Cursor cursor = image.cursor(x, yMin);

        // Draw.

        for (integer y = yMin;y < yMax;++y)
        {
            *cursor = colorMixer(*cursor, color);
            cursor.yIncrement();
        }
    }

    template <typename Type, typename Image_View>
    void drawVerticalLine(
        real x, integer y, real y2,
        const NoDeduction<Type>& color,
        const View<2, Type, Image_View>& image)
    {
        drawVerticalLine(
            x, y, y2, color, image, 
            assignColorMixer<Type>());
    }

}

#endif