Slic3r::SpiralVaseHelpers Namespace Reference

Functions
float	distance (SpiralVase::SpiralPoint a, SpiralVase::SpiralPoint b)
SpiralVase::SpiralPoint	subtract (SpiralVase::SpiralPoint a, SpiralVase::SpiralPoint b)
SpiralVase::SpiralPoint	add (SpiralVase::SpiralPoint a, SpiralVase::SpiralPoint b)
SpiralVase::SpiralPoint	scale (SpiralVase::SpiralPoint a, float factor)
float	dot (SpiralVase::SpiralPoint a, SpiralVase::SpiralPoint b)
SpiralVase::SpiralPoint	nearest_point_on_line (SpiralVase::SpiralPoint c, SpiralVase::SpiralPoint a, SpiralVase::SpiralPoint b, float &dist)
SpiralVase::SpiralPoint	nearest_point_on_lines (SpiralVase::SpiralPoint p, std::vector< SpiralVase::SpiralPoint > *points, bool &found, float &dist)

Function Documentation

add()

SpiralVase::SpiralPoint Slic3r::SpiralVaseHelpers::add	(	SpiralVase::SpiralPoint	a,
		SpiralVase::SpiralPoint	b )

{ return SpiralVase::SpiralPoint(a.x + b.x, a.y + b.y); }

References Slic3r::SpiralVase::SpiralPoint::x, and Slic3r::SpiralVase::SpiralPoint::y.

Referenced by nearest_point_on_line(), and Slic3r::SpiralVase::process_layer().

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distance()

float Slic3r::SpiralVaseHelpers::distance	(	SpiralVase::SpiralPoint	a,
		SpiralVase::SpiralPoint	b )

== Smooth Spiral Helpers == Distance between a and b

{ return sqrt(pow(a.x - b.x, 2) + pow(a.y - b.y, 2)); }

References Slic3r::SpiralVase::SpiralPoint::x, and Slic3r::SpiralVase::SpiralPoint::y.

Referenced by nearest_point_on_line(), and Slic3r::SpiralVase::process_layer().

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dot()

float Slic3r::SpiralVaseHelpers::dot	(	SpiralVase::SpiralPoint	a,
		SpiralVase::SpiralPoint	b )

dot product

{ return a.x * b.x + a.y * b.y; }

References Slic3r::SpiralVase::SpiralPoint::x, and Slic3r::SpiralVase::SpiralPoint::y.

Referenced by nearest_point_on_line().

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nearest_point_on_line()

SpiralVase::SpiralPoint Slic3r::SpiralVaseHelpers::nearest_point_on_line	(	SpiralVase::SpiralPoint	c,
		SpiralVase::SpiralPoint	a,
		SpiralVase::SpiralPoint	b,
		float &	dist )

Find the point on line ab closes to point c

{
    SpiralVase::SpiralPoint ab      = subtract(b, a);
    SpiralVase::SpiralPoint ca      = subtract(c, a);
    float                   t       = dot(ca, ab) / dot(ab, ab);
    t                               = t > 1 ? 1 : t;
    t                               = t < 0 ? 0 : t;
    SpiralVase::SpiralPoint closest = SpiralVase::SpiralPoint(add(a, scale(ab, t)));
    dist                            = distance(c, closest);
    return closest;
}

References add(), Slic3r::Geometry::dist(), distance(), dot(), scale(), and subtract().

Referenced by nearest_point_on_lines().

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nearest_point_on_lines()

SpiralVase::SpiralPoint Slic3r::SpiralVaseHelpers::nearest_point_on_lines	(	SpiralVase::SpiralPoint	p,
		std::vector< SpiralVase::SpiralPoint > *	points,
		bool &	found,
		float &	dist )

Given a set of lines defined by points such as line[n] is the line from points[n] to points[n+1], find the closest point to p that falls on any of the lines

{
    if (points->size() < 2) {
        found = false;
        return SpiralVase::SpiralPoint(0, 0);
    }
    float                   min = std::numeric_limits<float>::max();
    SpiralVase::SpiralPoint closest(0, 0);
    for (unsigned long i = 0; i < points->size() - 1; i++) {
        float                   currentDist = 0;
        SpiralVase::SpiralPoint current     = nearest_point_on_line(p, points->at(i), points->at(i + 1), currentDist);
        if (currentDist < min) {
            min     = currentDist;
            closest = current;
            found   = true;
        }
    }
    dist = min;
    return closest;
}

References Slic3r::Geometry::dist(), and nearest_point_on_line().

Referenced by Slic3r::SpiralVase::process_layer().

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scale()

SpiralVase::SpiralPoint Slic3r::SpiralVaseHelpers::scale	(	SpiralVase::SpiralPoint	a,
		float	factor )

{ return SpiralVase::SpiralPoint(a.x * factor, a.y * factor); }

References Slic3r::SpiralVase::SpiralPoint::x, and Slic3r::SpiralVase::SpiralPoint::y.

Referenced by nearest_point_on_line(), and Slic3r::SpiralVase::process_layer().

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subtract()

SpiralVase::SpiralPoint Slic3r::SpiralVaseHelpers::subtract	(	SpiralVase::SpiralPoint	a,
		SpiralVase::SpiralPoint	b )

{
    return SpiralVase::SpiralPoint(a.x - b.x, a.y - b.y);
}

References Slic3r::SpiralVase::SpiralPoint::x, and Slic3r::SpiralVase::SpiralPoint::y.

Referenced by nearest_point_on_line().

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