#include <kis_paintop_utils.h>

Public Member Functions
QPointF	pushThroughHistory (const QPointF &pt, qreal zoom)

void	reset (const QPointF &pt)

Private Attributes
QPointF	m_first

QPointF	m_second

Detailed Description

A special class containing the previous position of the cursor for the sake of painting the outline of the paint op. The main purpose of this class is to ensure that the saved point does not equal to the current one, which would cause a outline flicker. To achieve this the class stores two previously requested points instead of the last one.

Definition at line 113 of file kis_paintop_utils.h.

Member Function Documentation

◆ pushThroughHistory()

QPointF KisPaintOpUtils::PositionHistory::pushThroughHistory	(	const QPointF &	pt,
		qreal	zoom )

inline

Returns: the previously used point, which is guaranteed not to be equal to pt and updates the history if needed

We use per-axis distance to avoid artifacts when using devices that send events in a staircase way.

Ideally, we should make the transition from m_first to m_second smooth, but simple blending via 'coeff' doesn't work for some reason.

Definition at line 120 of file kis_paintop_utils.h.

                                                              {
        QPointF result;
        const qreal pointSwapThreshold = 7.0 / zoom;
 
        const qreal distance = qMin(qAbs(pt.x() - m_second.x()), qAbs(pt.y() - m_second.y()));
        const qreal coeff = qMin(1.0, distance / pointSwapThreshold);
 
        if (coeff > 1.0 - std::numeric_limits<qreal>::epsilon()) {
            result = m_second;
            m_first = m_second;
            m_second = pt;
        } else {
            result = m_first;
        }
 
        return result;
    }

References distance().

◆ reset()

void KisPaintOpUtils::PositionHistory::reset ( const QPointF & pt )

inline

Definition at line 146 of file kis_paintop_utils.h.

    {
        m_first = pt;
        m_second = pt;
    }

Member Data Documentation

◆ m_first

QPointF KisPaintOpUtils::PositionHistory::m_first

private

Definition at line 153 of file kis_paintop_utils.h.

◆ m_second

QPointF KisPaintOpUtils::PositionHistory::m_second

private

Definition at line 154 of file kis_paintop_utils.h.

The documentation for this class was generated from the following file:

libs/image/brushengine/kis_paintop_utils.h

Public Member Functions