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router: improve heuristic to avoid segment drag 'flickery snapping' 

Fixes https://gitlab.com/kicad/code/kicad/-/issues/10113
This commit is contained in:
Tomasz Wlostowski 2022-12-29 12:16:25 +01:00
parent 157b93c4ae
commit dfb1068358
1 changed files with 3 additions and 2 deletions
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5
pcbnew/router/pns_tool_base.cpp
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@ -264,12 +264,13 @@ bool TOOL_BASE::checkSnap( ITEM *aItem )
// Sync PNS engine settings with the general PCB editor options.
auto& pnss = m_router->Settings();
// If we're dragging a track segment, don't try to snap to items on the same copper layer.
// If we're dragging a track segment, don't try to snap to items on the same copper layer with same nets. This is not a perfect heuristic, but seems to work reasonably well :-)
// This way we avoid 'flickery' behaviour for short segments when the snap algo is trying to
// snap to the corners of the segments next to the one being dragged.
if( m_startItem && aItem && m_router->GetState() == ROUTER::DRAG_SEGMENT
&& aItem->Layer() == m_startItem->Layer() && aItem->OfKind( ITEM::SEGMENT_T )
&& m_startItem->OfKind( ITEM::SEGMENT_T ) )
&& m_startItem->OfKind( ITEM::SEGMENT_T )
&& aItem->Net() == m_startItem->Net() )
return false;
pnss.SetSnapToPads(