diff options
Diffstat (limited to 'src/gui/painting/qbezier_p.h')
| -rw-r--r-- | src/gui/painting/qbezier_p.h | 36 |
1 files changed, 18 insertions, 18 deletions
diff --git a/src/gui/painting/qbezier_p.h b/src/gui/painting/qbezier_p.h index 399dd89140..f1f7eb155a 100644 --- a/src/gui/painting/qbezier_p.h +++ b/src/gui/painting/qbezier_p.h @@ -162,27 +162,27 @@ inline void QBezier::coefficients(qreal t, qreal &a, qreal &b, qreal &c, qreal & inline QPointF QBezier::pointAt(qreal t) const { -#if 1 - qreal a, b, c, d; - coefficients(t, a, b, c, d); - return QPointF(a*x1 + b*x2 + c*x3 + d*x4, a*y1 + b*y2 + c*y3 + d*y4); -#else // numerically more stable: + qreal x, y; + qreal m_t = 1. - t; - qreal a = x1*m_t + x2*t; - qreal b = x2*m_t + x3*t; - qreal c = x3*m_t + x4*t; - a = a*m_t + b*t; - b = b*m_t + c*t; - qreal x = a*m_t + b*t; - qreal a = y1*m_t + y2*t; - qreal b = y2*m_t + y3*t; - qreal c = y3*m_t + y4*t; - a = a*m_t + b*t; - b = b*m_t + c*t; - qreal y = a*m_t + b*t; + { + qreal a = x1*m_t + x2*t; + qreal b = x2*m_t + x3*t; + qreal c = x3*m_t + x4*t; + a = a*m_t + b*t; + b = b*m_t + c*t; + x = a*m_t + b*t; + } + { + qreal a = y1*m_t + y2*t; + qreal b = y2*m_t + y3*t; + qreal c = y3*m_t + y4*t; + a = a*m_t + b*t; + b = b*m_t + c*t; + y = a*m_t + b*t; + } return QPointF(x, y); -#endif } inline QPointF QBezier::normalVector(qreal t) const |