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Fix arc drawing so that it works in all 4 quadrants. 

Fixes: lp:1836116
* https://bugs.launchpad.net/kicad/+bug/1836116
This commit is contained in:
Jeff Young 2019-07-14 18:09:38 +01:00
parent a3c74051c2
commit d767e83dac
1 changed files with 38 additions and 10 deletions
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48
eeschema/lib_arc.cpp
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@ -429,6 +429,8 @@ void LIB_ARC::BeginEdit( const wxPoint aPosition )
void LIB_ARC::CalcEdit( const wxPoint& aPosition )
{
#define sq( x ) pow( x, 2 )
// Edit state 0: drawing: place ArcStart
// Edit state 1: drawing: place ArcEnd (center calculated for 90-degree subtended angle)
// Edit state 2: point editing: move ArcStart (center calculated for invariant subtended angle)
@ -441,7 +443,10 @@ void LIB_ARC::CalcEdit( const wxPoint& aPosition )
m_ArcStart = aPosition;
m_ArcEnd = aPosition;
m_Pos = aPosition;
break;
m_Radius = 0;
m_t1 = 0;
m_t2 = 0;
return;
case 1:
m_ArcEnd = aPosition;
@ -452,7 +457,7 @@ void LIB_ARC::CalcEdit( const wxPoint& aPosition )
case 3:
{
wxPoint v = m_ArcStart - m_ArcEnd;
double chordBefore = v.x * v.x + v.y * v.y;
double chordBefore = sq( v.x ) + sq( v.y );
if( m_editState == 2 )
m_ArcStart = aPosition;
@ -460,7 +465,7 @@ void LIB_ARC::CalcEdit( const wxPoint& aPosition )
m_ArcEnd = aPosition;
v = m_ArcStart - m_ArcEnd;
double chordAfter = v.x * v.x + v.y * v.y;
double chordAfter = sq( v.x ) + sq( v.y );
double ratio = chordAfter / chordBefore;
m_Radius = KiROUND( sqrt( m_Radius * m_Radius * ratio ) );
@ -481,17 +486,40 @@ void LIB_ARC::CalcEdit( const wxPoint& aPosition )
// Calculate 'd', the vector from the chord midpoint to the center
wxPoint d;
d.x = KiROUND( sqrt( pow( m_Radius, 2 ) - pow( l/2, 2) ) * ( m_ArcStart.y - m_ArcEnd.y ) / l );
d.y = KiROUND( sqrt( pow( m_Radius, 2 ) - pow( l/2, 2) ) * ( m_ArcEnd.x - m_ArcStart.x ) / l );
if( d.x < 0 || d.y < 0 ) // sqrt() doesn't like really small numbers...
d = { 0, 0 };
d.x = KiROUND( sqrt( sq( m_Radius ) - sq( l/2 ) ) * ( m_ArcStart.y - m_ArcEnd.y ) / l );
d.y = KiROUND( sqrt( sq( m_Radius ) - sq( l/2 ) ) * ( m_ArcEnd.x - m_ArcStart.x ) / l );
wxPoint c1 = m + d;
wxPoint c2 = m - d;
wxPoint test = ( m_editState == 4 ) ? aPosition : m_Pos;
m_Pos = ( m_editState > 1 && GetLineLength( c1, test ) < GetLineLength( c2, test ) ) ? c1 : c2;
// Solution gives us 2 centers; we need to pick one:
switch( m_editState )
{
case 1:
{
// Keep center clockwise from chord while drawing
wxPoint chordVector = twoPointVector( m_ArcStart, m_ArcEnd );
double chordAngle = ArcTangente( chordVector.y, chordVector.x );
NORMALIZE_ANGLE_POS( chordAngle );
wxPoint c1Test = c1;
RotatePoint( &c1Test, m_ArcStart, -chordAngle );
m_Pos = c1Test.x > 0 ? c2 : c1;
}
break;
case 2:
case 3:
// Pick the one closer to the old center
m_Pos = ( GetLineLength( c1, m_Pos ) < GetLineLength( c2, m_Pos ) ) ? c1 : c2;
break;
case 4:
// Pick the one closer to the mouse position
m_Pos = ( GetLineLength( c1, aPosition ) < GetLineLength( c2, aPosition ) ) ? c1 : c2;
break;
}
CalcRadiusAngles();
}