qtriangulator_p.h

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#ifndef QTRIANGULATOR_P_H
#define QTRIANGULATOR_P_H

//
//  W A R N I N G
//  -------------
//
// This file is not part of the Qt API.  It exists purely as an
// implementation detail.  This header file may change from version to
// version without notice, or even be removed.
//
// We mean it.
//

#include <QtCore/qvector.h>
#include <QtGui/private/qvectorpath_p.h>

QT_BEGIN_NAMESPACE

class QVertexIndexVector
{
public:
    enum Type {
        UnsignedInt,
        UnsignedShort
    };

    inline Type type() const { return t; }

    inline void setDataUint(const QVector<quint32> &data)
    {
        t = UnsignedInt;
        indices32 = data;
    }

    inline void setDataUshort(const QVector<quint16> &data)
    {
        t = UnsignedShort;
        indices16 = data;
    }

    inline const void* data() const
    {
        if (t == UnsignedInt)
            return indices32.data();
        return indices16.data();
    }

    inline int size() const
    {
        if (t == UnsignedInt)
            return indices32.size();
        return indices16.size();
    }

    inline QVertexIndexVector &operator = (const QVertexIndexVector &other)
    {
         if (t == UnsignedInt)
           indices32 = other.indices32;
         else
           indices16 = other.indices16;

         return *this;
    }

private:

    Type t;
    QVector<quint32> indices32;
    QVector<quint16> indices16;
};

struct QTriangleSet
{
    inline QTriangleSet() { }
    inline QTriangleSet(const QTriangleSet &other) : vertices(other.vertices), indices(other.indices) { }
    QTriangleSet &operator = (const QTriangleSet &other) {vertices = other.vertices; indices = other.indices; return *this;}

    // The vertices of a triangle are given by: (x[i[n]], y[i[n]]), (x[j[n]], y[j[n]]), (x[k[n]], y[k[n]]), n = 0, 1, ...
    QVector<qreal> vertices; // [x[0], y[0], x[1], y[1], x[2], ...]
    QVertexIndexVector indices; // [i[0], j[0], k[0], i[1], j[1], k[1], i[2], ...]
};

struct QPolylineSet
{
    inline QPolylineSet() { }
    inline QPolylineSet(const QPolylineSet &other) : vertices(other.vertices), indices(other.indices) { }
    QPolylineSet &operator = (const QPolylineSet &other) {vertices = other.vertices; indices = other.indices; return *this;}

    QVector<qreal> vertices; // [x[0], y[0], x[1], y[1], x[2], ...]
    QVertexIndexVector indices;
};

// The vertex coordinates of the returned triangle set will be rounded to a grid with a mesh size
// of 1/32. The polygon is first transformed, then scaled by 32, the coordinates are rounded to
// integers, the polygon is triangulated, and then scaled back by 1/32.
// 'hint' should be a combination of QVectorPath::Hints.
// 'lod' is the level of detail. Default is 1. Curves are split into more lines when 'lod' is higher.
QTriangleSet qTriangulate(const qreal *polygon, int count, uint hint = QVectorPath::PolygonHint | QVectorPath::OddEvenFill, const QTransform &matrix = QTransform());
QTriangleSet qTriangulate(const QVectorPath &path, const QTransform &matrix = QTransform(), qreal lod = 1);
QTriangleSet qTriangulate(const QPainterPath &path, const QTransform &matrix = QTransform(), qreal lod = 1);
QPolylineSet qPolyline(const QVectorPath &path, const QTransform &matrix = QTransform(), qreal lod = 1);
QPolylineSet qPolyline(const QPainterPath &path, const QTransform &matrix = QTransform(), qreal lod = 1);

QT_END_NAMESPACE

#endif