/** @brief We drag our finger on the screen to another location.
* @param p [in] New location of our finger.
* @return true on success.
*/
bool ChandWriter::onPaintingMove( const Cpoint &point)
{
Cpoint p =point-(m_rect.leftTop()*8);
if ( m_surface ==NULL)
{
return false;
}
if ( !m_started)
{
m_started =true;
addPoint( p.x, p.y);
#ifdef USE_SDL2
m_graphics->setRenderArea( m_surface);
m_graphics->pixel( p.x, p.y);
m_graphics->setRenderArea( NULL);
#else
CtextSurface::pixel( m_surface, p);
#endif
m_lastPoint =p;
m_index =1;
}
else
{
// Not for small distances.
if ( p.distance( m_lastPoint) >m_minimum_distance && ++m_index<1000)
{
// New line detected.
addPoint( p.x, p.y);
#ifdef USE_SDL2
m_graphics->setRenderArea( m_surface);
m_graphics->line( m_lastPoint.x, m_lastPoint.y, p.x, p.y);
m_graphics->setRenderArea( NULL);
#else
CtextSurface::line( m_surface, m_lastPoint, p);
#endif
// pixel(%d,%d) to (%d,%d)", m_lastPoint.x, m_lastPoint.y, p.x, p.y);
m_lastPoint =p;
}
}
Cimage::onPaint(0);
onUpdate();
return true;
}
