qt5base-lts/tests/auto/qtessellator/testtessellator.cpp

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#include "testtessellator.h"
#include <private/qtessellator_p.h>

#include "math.h"

class TestTessellator : public QTessellator
{
public:
    QVector<XTrapezoid> *traps;
    void addTrap(const Trapezoid &trap);
};

void TestTessellator::addTrap(const Trapezoid &trap)
{
    XTrapezoid xtrap;
    xtrap.top = Q27Dot5ToXFixed(trap.top);
    xtrap.bottom = Q27Dot5ToXFixed(trap.bottom);
    xtrap.left.p1.x = Q27Dot5ToXFixed(trap.topLeft->x);
    xtrap.left.p1.y = Q27Dot5ToXFixed(trap.topLeft->y);
    xtrap.left.p2.x = Q27Dot5ToXFixed(trap.bottomLeft->x);
    xtrap.left.p2.y = Q27Dot5ToXFixed(trap.bottomLeft->y);
    xtrap.right.p1.x = Q27Dot5ToXFixed(trap.topRight->x);
    xtrap.right.p1.y = Q27Dot5ToXFixed(trap.topRight->y);
    xtrap.right.p2.x = Q27Dot5ToXFixed(trap.bottomRight->x);
    xtrap.right.p2.y = Q27Dot5ToXFixed(trap.bottomRight->y);
    traps->append(xtrap);
}


void test_tesselate_polygon(QVector<XTrapezoid> *traps, const QPointF *points, int nPoints,
                         bool winding)
{
    TestTessellator t;
    t.traps = traps;
    t.setWinding(winding);
    t.tessellate(points, nPoints);
}


void test_tessellate_polygon_convex(QVector<XTrapezoid> *traps, const QPointF *points, int nPoints,
                                   bool winding)
{
    TestTessellator t;
    t.traps = traps;
    t.setWinding(winding);
    t.tessellateConvex(points, nPoints);
}


void test_tessellate_polygon_rect(QVector<XTrapezoid> *traps, const QPointF *points, int nPoints,
                                  bool winding)
{
    // 5 points per rect
    Q_ASSERT(nPoints % 5 == 0);

    TestTessellator t;
    t.traps = traps;
    t.setWinding(winding);
    for (int i = 0; i < nPoints / 5; ++i) {
        QPointF rectA = points[5*i];
        QPointF rectB = points[5*i+1];
        QPointF rectC = points[5*i+2];
        QPointF rectD = points[5*i+3];

        QPointF a = (rectA + rectD) * 0.5;
        QPointF b = (rectB + rectC) * 0.5;

        QPointF delta = rectA - rectD;

        qreal width = sqrt(delta.x() * delta.x() + delta.y() * delta.y());

        t.tessellateRect(a, b, width);
    }
}