Ipelib
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#include <ipeshape.h>
Public Types | |
enum | Type { EArc, ESegment, ESpline, EOldSpline, ECardinalSpline, ESpiroSpline } |
Public Member Functions | |
Type | type () const |
int | countCP () const |
Vector | cp (int i) const |
Vector | last () const |
Matrix | matrix () const |
float | tension () const |
Arc | arc () const |
void | beziers (std::vector< Bezier > &bez) const |
void | draw (Painter &painter) const |
void | addToBBox (Rect &box, const Matrix &m, bool cp) const |
double | distance (const Vector &v, const Matrix &m, double bound) const |
void | snapVtx (const Vector &mouse, const Matrix &m, Vector &pos, double &bound, bool cp) const |
void | snapBnd (const Vector &mouse, const Matrix &m, Vector &pos, double &bound) const |
Friends | |
class | Curve |
A segment on an SubPath.
A segment is either an elliptic arc, a straight segment, or a spline curve, depending on its type(). This is a lightweight object, created on the fly by Curve::segment(). There is no public constructor, so the only way to create such an object is through that method.
The type() is one of the following:
ESegment:
the segment has two control points, and represents a line segment.ESpline:
a B-spline curve with n control points. The first and last control point's knot value is repeated three times, so the curve begins and ends in these points. A spline with 4 control points is a single Bezier curve with those control points. A spline with 3 control points is defined to be a quadratic Bezier curve with those control points.ECardinalSpline:
a cardinal spline curve with n control points. The curve passes through the control points in the given order. The tension is currently fixed at 0.5.ESpiroSpline:
a clothoid spline curve with n control points, computed using Raph Levien's spiro code (through libspiro).EOldSpline:
an incorrectly defined B-spline, used by Ipe for many years. Supported for compatibility.EArc:
an elliptic arc, with begin and end point. The supporting ellipse is defined by the matrix(), it is the image under the affine transformation matrix() of the unit circle. matrix() is such that its inverse transforms both start and end position to points (nearly) on the unit circle. The arc is the image of the positively (counter-clockwise) directed arc from the pre-image of the start position to the pre-image of the end position. Whether this is a positively or negatively oriented arc in user space depends on the matrix.
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Type of segment.
Referenced by ipe::Path::clone(), and ipe::Shape::isSegment().
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Number of control points.
Referenced by ipe::Path::clone().
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Return control point.
References addToBBox(), arc(), beziers(), distance(), draw(), last(), matrix(), snapBnd(), snapVtx(), and tension().
Referenced by ipe::Path::clone(), ipe::Curve::closed(), and ipe::Ellipse::matrix().
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Return last control point.
Referenced by ipe::Path::clone(), and cp().
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Referenced by ipe::Path::clone(), cp(), and ipe::Path::draw().
float CurveSegment::tension | ( | ) | const |
Tension (if Type() == ECardinalSpline)
Panics if segment is not a cardinal spline.
References ipe::ECardinalSpline.
Referenced by ipe::Curve::appendOldSpline(), and cp().
Arc CurveSegment::arc | ( | ) | const |
void CurveSegment::beziers | ( | std::vector< Bezier > & | bez | ) | const |
Convert spline curve to a sequence of Bezier splines.
References ipe::Bezier::cardinalSpline(), ipe::ECardinalSpline, ipe::ESpiroSpline, ipe::Bezier::oldSpline(), and ipe::Bezier::spline().
Referenced by cp().
void CurveSegment::draw | ( | Painter & | painter | ) | const |
Draw the segment.
Current position of the painter is already on first control point.
References ipe::Painter::curveTo(), ipe::Painter::drawArc(), ipe::ECardinalSpline, ipe::ESpiroSpline, and ipe::Painter::lineTo().
Referenced by ipe::Curve::closed(), cp(), ipe::Ellipse::matrix(), and ipe::Shape::subPath().
Add segment to bounding box.
Does not assume that first control point has already been added.
If cpf is true, then control points of splines, Bezier curves, and the center of arcs are included in the bbox (so that snapping can find them). Otherwise, a tight bounding box for the geometric object itself is computed.
References ipe::Rect::addPoint(), ipe::Rect::addRect(), ipe::ECardinalSpline, and ipe::ESpiroSpline.
Referenced by ipe::Curve::closed(), cp(), and ipe::Ellipse::matrix().
Return distance to the segment.
References ipe::Segment::distance(), ipe::ECardinalSpline, and ipe::ESpiroSpline.
Referenced by ipe::Curve::closed(), cp(), and ipe::Ellipse::matrix().
void CurveSegment::snapVtx | ( | const Vector & | mouse, |
const Matrix & | m, | ||
Vector & | pos, | ||
double & | bound, | ||
bool | ctl | ||
) | const |
Snap to vertex of the segment.
The method assumes that the first control point has already been tested.
References ipe::ECardinalSpline, and ipe::ESpiroSpline.
Referenced by ipe::Curve::closed(), cp(), and ipe::Ellipse::matrix().
void CurveSegment::snapBnd | ( | const Vector & | mouse, |
const Matrix & | m, | ||
Vector & | pos, | ||
double & | bound | ||
) | const |
References ipe::Curve::Curve(), ipe::Arc::distance(), ipe::ECardinalSpline, ipe::ESpiroSpline, and ipe::Segment::snap().
Referenced by ipe::Curve::closed(), cp(), and ipe::Ellipse::matrix().
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