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Refinements and fixes in auto-pan. 

Add comments.
Fix incorrect comparison.
Fix a too fast auto-pan speed when auto-pan acceleration was not set to the minimal value.
This commit is contained in:
jean-pierre charras 2021-01-19 10:26:33 +01:00
parent 1491330596
commit fed56572f8
1 changed files with 11 additions and 3 deletions
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14
common/view/wx_view_controls.cpp
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@ -494,13 +494,21 @@ void WX_VIEW_CONTROLS::onTimer( wxTimerEvent& aEvent )
double borderSize = std::min( m_settings.m_autoPanMargin * m_view->GetScreenPixelSize().x,
m_settings.m_autoPanMargin * m_view->GetScreenPixelSize().y );
// When the mouse cursor is outside the area with no pan,
// m_panDirection is the dist to this area limit ( in pixels )
// It will be used also as pan value (the pan speed depends on this dist).
VECTOR2D dir( m_panDirection );
// When the mouse cursor is outside the area with no pan, the pan value
// is accelerated depending on the dist between the area and the cursor
float accel = 0.5f + ( m_settings.m_autoPanAcceleration / 5.0f );
if( dir.EuclideanNorm() > borderSize / 2 )
dir = dir.Resize( pow( borderSize, accel ) );
else if( dir.EuclideanNorm() > borderSize )
// For a small mouse cursor dist to area, just use the distance.
// But for a dist > borderSize / 2, use an accelerated pan value
if( dir.EuclideanNorm() >= borderSize ) // far from area limits
dir = dir.Resize( borderSize * accel );
else if( dir.EuclideanNorm() > borderSize / 2 ) // Near from area limits
dir = dir.Resize( borderSize );
dir = m_view->ToWorld( dir, false );