kicad/pcbnew/magnetic_tracks_functions.cpp

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