286 lines
9.2 KiB
C++
286 lines
9.2 KiB
C++
/**
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* @file magnetic_tracks_functions.cpp
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*/
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/* functions used to control the cursor position, when creating a track
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* and when the "magnetic tracks" option is on
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* (the current created track is kept near existing tracks
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* the distance is the clearance between tracks)
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*/
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#include <fctsys.h>
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#include <pcbnew.h>
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#include <wxPcbStruct.h>
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#include <macros.h>
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#include <pcbcommon.h>
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#include <class_board.h>
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#include <class_track.h>
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#include <protos.h>
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#include <pcbnew_id.h>
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/**
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* Function Join
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* finds the point where line segment (b1,b0) intersects with segment (a1,a0).
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* If that point would be outside of (a0,a1), the respective endpoint is used.
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* Join returns the point in "res" and "true" if a suitable point was found,
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* "false" if both lines are parallel or if the length of either segment is zero.
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*/
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static bool Join( wxPoint* aIntersectPoint, wxPoint a0, wxPoint a1, wxPoint b0, wxPoint b1 )
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{
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/* References:
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http://local.wasp.uwa.edu.au/~pbourke/geometry/lineline2d/
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http://www.gekkou.co.uk/blogs/monologues/2007/12/13/1197586800000.html
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*/
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double denom;
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double t;
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// if either segment is zero length
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if( a1.x==a0.x && a1.y==a0.y )
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return false;
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if( b1.x==b0.x && b1.y==b0.y )
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return false;
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a1 -= a0;
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b1 -= b0;
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b0 -= a0;
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denom = (double) b1.y * a1.x - (double) b1.x * a1.y;
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if( !denom )
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{
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return false; // parallel
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}
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t = ((double) b1.y * b0.x - (double) b1.x * b0.y ) / denom;
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t = std::min( std::max( t, 0.0 ), 1.0 );
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aIntersectPoint->x = KiROUND( a0.x + t * a1.x );
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aIntersectPoint->y = KiROUND( a0.y + t * a1.y );
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return true;
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}
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/*
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* "Project" finds the projection of a grid point on a track. This is the point
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* from where we want to draw new orthogonal tracks when starting on a track.
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*/
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bool Project( wxPoint* aNearPos, wxPoint on_grid, const TRACK* track )
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{
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if( track->GetStart ()== track->GetEnd() )
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return false;
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wxPoint vec = track->GetEnd() - track->GetStart();
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double t = double( on_grid.x - track->GetStart().x ) * vec.x +
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double( on_grid.y - track->GetStart().y ) * vec.y;
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t /= (double) vec.x * vec.x + (double) vec.y * vec.y;
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t = std::min( std::max( t, 0.0 ), 1.0 );
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aNearPos->x = KiROUND( track->GetStart().x + t * vec.x );
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aNearPos->y = KiROUND( track->GetStart().y + t * vec.y );
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return true;
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}
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/**
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* Function Magnetize
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* tests to see if there are any magnetic items within near reach of the given
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* "curpos". If yes, then curpos is adjusted appropriately according to that
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* near magnetic item and true is returned.
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* @param frame = the current frame
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* @param aCurrentTool = the current tool id (from vertical right toolbar)
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* @param aGridSize = the current grid size
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* @param on_grid = the on grid position near initial position ( often on_grid = curpos)
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* @param curpos The initial position, and what to adjust if a change is needed.
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* @return bool - true if the position was adjusted magnetically, else false.
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*/
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bool Magnetize( PCB_EDIT_FRAME* frame, int aCurrentTool, wxSize aGridSize,
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wxPoint on_grid, wxPoint* curpos )
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{
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bool doCheckNet = g_MagneticPadOption != capture_always && g_Drc_On;
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bool doTrack = false;
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bool doPad = false;
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bool amMovingVia = false;
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BOARD* m_Pcb = frame->GetBoard();
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TRACK* currTrack = g_CurrentTrackSegment;
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BOARD_ITEM* currItem = frame->GetCurItem();
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PCB_SCREEN* screen = frame->GetScreen();
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wxPoint pos = screen->RefPos( true );
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// D( printf( "currTrack=%p currItem=%p currTrack->Type()=%d currItem->Type()=%d\n", currTrack, currItem, currTrack ? currTrack->Type() : 0, currItem ? currItem->Type() : 0 ); )
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if( !currTrack && currItem && currItem->Type()==PCB_VIA_T && currItem->GetFlags() )
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{
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// moving a VIA
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currTrack = (TRACK*) currItem;
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amMovingVia = true;
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return false; // comment this return out and play with it.
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}
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else if( currItem != currTrack )
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{
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currTrack = NULL;
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}
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if( g_MagneticPadOption == capture_always )
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doPad = true;
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if( g_MagneticTrackOption == capture_always )
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doTrack = true;
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if( aCurrentTool == ID_TRACK_BUTT || amMovingVia )
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{
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int q = capture_cursor_in_track_tool;
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if( g_MagneticPadOption == q )
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doPad = true;
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if( g_MagneticTrackOption == q )
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doTrack = true;
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}
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// D(printf("doPad=%d doTrack=%d aCurrentTool=%d amMovingVia=%d\n", doPad, doTrack, aCurrentTool, amMovingVia );)
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// The search precedence order is pads, then tracks/vias
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if( doPad )
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{
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LAYER_MSK layer_mask = GetLayerMask( screen->m_Active_Layer );
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D_PAD* pad = m_Pcb->GetPad( pos, layer_mask );
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if( pad )
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{
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if( doCheckNet && currTrack && currTrack->GetNet() != pad->GetNet() )
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return false;
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*curpos = pad->GetPosition();
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return true;
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}
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}
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// after pads, only track & via tests remain, skip them if not desired
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if( doTrack )
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{
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LAYER_NUM layer = screen->m_Active_Layer;
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for( TRACK* via = m_Pcb->m_Track;
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via && (via = via->GetVia( *curpos, layer )) != NULL;
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via = via->Next() )
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{
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if( via != currTrack ) // a via cannot influence itself
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{
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if( !doCheckNet || !currTrack || currTrack->GetNet() == via->GetNet() )
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{
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*curpos = via->GetStart();
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// D(printf("via hit\n");)
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return true;
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}
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}
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}
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if( !currTrack )
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{
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LAYER_MSK layer_mask = GetLayerMask( layer );
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TRACK* track = m_Pcb->GetTrace( m_Pcb->m_Track, pos, layer_mask );
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if( !track || track->Type() != PCB_TRACE_T )
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{
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// D(printf("!currTrack and track=%p not found, layer_mask=0x%X\n", track, layer_mask );)
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return false;
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}
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// D( printf( "Project\n" ); )
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return Project( curpos, on_grid, track );
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}
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/*
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* In two segment mode, ignore the final segment if it's inside a grid square.
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*/
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if( !amMovingVia && currTrack && g_TwoSegmentTrackBuild && currTrack->Back()
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&& currTrack->GetStart().x - aGridSize.x < currTrack->GetEnd().x
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&& currTrack->GetStart().x + aGridSize.x > currTrack->GetEnd().x
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&& currTrack->GetStart().y - aGridSize.y < currTrack->GetEnd().y
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&& currTrack->GetStart().y + aGridSize.y > currTrack->GetEnd().y )
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{
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currTrack = currTrack->Back();
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}
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for( TRACK* track = m_Pcb->m_Track; track; track = track->Next() )
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{
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if( track->Type() != PCB_TRACE_T )
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continue;
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if( doCheckNet && currTrack && currTrack->GetNet() != track->GetNet() )
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continue;
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if( m_Pcb->IsLayerVisible( track->GetLayer() ) == false )
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continue;
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// omit the layer check if moving a via
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if( !amMovingVia && !track->IsOnLayer( layer ) )
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continue;
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if( !track->HitTest( *curpos ) )
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continue;
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// D(printf( "have track prospect\n");)
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if( Join( curpos, track->GetStart(), track->GetEnd(), currTrack->GetStart(), currTrack->GetEnd() ) )
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{
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// D(printf( "join currTrack->Type()=%d\n", currTrack->Type() );)
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return true;
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}
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if( aCurrentTool == ID_TRACK_BUTT || amMovingVia )
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{
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// At this point we have a drawing mouse on a track, we are drawing
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// a new track and that new track is parallel to the track the
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// mouse is on. Find the nearest end point of the track under mouse
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// to the mouse and return that.
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double distStart = hypot( double( curpos->x - track->GetStart().x ),
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double( curpos->y - track->GetStart().y ));
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double distEnd = hypot( double( curpos->x - track->GetEnd().x ),
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double( curpos->y - track->GetEnd().y ));
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// if track not via, or if its a via dragging but not with its adjacent track
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if( currTrack->Type() != PCB_VIA_T
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|| ( currTrack->GetStart() != track->GetStart() && currTrack->GetStart() != track->GetEnd() ))
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{
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if( distStart <= currTrack->GetWidth()/2 )
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{
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// D(printf("nearest end is start\n");)
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*curpos = track->GetStart();
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return true;
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}
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if( distEnd <= currTrack->GetWidth()/2 )
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{
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// D(printf("nearest end is end\n");)
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*curpos = track->GetEnd();
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return true;
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}
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// @todo otherwise confine curpos such that it stays centered within "track"
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}
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}
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}
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}
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return false;
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}
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