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kicad/eeschema/lib_arc.cpp

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/*
* This program source code file is part of KiCad, a free EDA CAD application.
*
* Copyright (C) 2017 Jean-Pierre Charras, jp.charras at wanadoo.fr
* Copyright (C) 2004-2017 KiCad Developers, see AUTHORS.txt for contributors.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, you may find one here:
* http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
* or you may search the http://www.gnu.org website for the version 2 license,
* or you may write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
*/
/**
* @file lib_arc.cpp
*/
#include <fctsys.h>
#include <gr_basic.h>
#include <macros.h>
#include <sch_draw_panel.h>
#include <plotter.h>
#include <trigo.h>
#include <base_units.h>
#include <msgpanel.h>
#include <bitmaps.h>
#include <general.h>
#include <lib_arc.h>
#include <transform.h>
// Helper function
static inline wxPoint twoPointVector( const wxPoint &startPoint, const wxPoint &endPoint )
{
return endPoint - startPoint;
}
//! @brief Given three points A B C, compute the circumcenter of the resulting triangle
//! reference: http://en.wikipedia.org/wiki/Circumscribed_circle
//! Coordinates of circumcenter in Cartesian coordinates
static wxPoint calcCenter( const wxPoint& A, const wxPoint& B, const wxPoint& C )
{
double circumCenterX, circumCenterY;
double Ax = (double) A.x;
double Ay = (double) A.y;
double Bx = (double) B.x;
double By = (double) B.y;
double Cx = (double) C.x;
double Cy = (double) C.y;
wxPoint circumCenter;
double D = 2.0 * ( Ax * ( By - Cy ) + Bx * ( Cy - Ay ) + Cx * ( Ay - By ) );
// prevent division / 0
if( fabs( D ) < 1e-7 )
D = 1e-7;
circumCenterX = ( (Ay * Ay + Ax * Ax) * (By - Cy) +
(By * By + Bx * Bx) * (Cy - Ay) +
(Cy * Cy + Cx * Cx) * (Ay - By) ) / D;
circumCenterY = ( (Ay * Ay + Ax * Ax) * (Cx - Bx) +
(By * By + Bx * Bx) * (Ax - Cx) +
(Cy * Cy + Cx * Cx) * (Bx - Ax) ) / D;
circumCenter.x = (int) circumCenterX;
circumCenter.y = (int) circumCenterY;
return circumCenter;
}
LIB_ARC::LIB_ARC( LIB_PART* aParent ) : LIB_ITEM( LIB_ARC_T, aParent )
{
m_Radius = 0;
m_t1 = 0;
m_t2 = 0;
m_Width = 0;
m_Fill = NO_FILL;
m_isFillable = true;
m_editState = 0;
m_lastEditState = 0;
m_editCenterDistance = 0.0;
m_editSelectPoint = ARC_STATUS_START;
m_editDirection = 0;
}
bool LIB_ARC::HitTest( const wxPoint& aRefPoint ) const
{
int mindist = GetPenSize() / 2;
// Have a minimal tolerance for hit test
if( mindist < MINIMUM_SELECTION_DISTANCE )
mindist = MINIMUM_SELECTION_DISTANCE;
return HitTest( aRefPoint, mindist, DefaultTransform );
}
bool LIB_ARC::HitTest( const wxPoint &aPosition, int aThreshold, const TRANSFORM& aTransform ) const
{
if( aThreshold < 0 )
aThreshold = GetPenSize() / 2;
// TODO: use aTransMat to calculates parameters
wxPoint relativePosition = aPosition;
relativePosition.y = -relativePosition.y; // reverse Y axis
int distance = KiROUND( GetLineLength( m_Pos, relativePosition ) );
if( abs( distance - m_Radius ) > aThreshold )
return false;
// We are on the circle, ensure we are only on the arc, i.e. between
// m_ArcStart and m_ArcEnd
wxPoint startEndVector = twoPointVector( m_ArcStart, m_ArcEnd);
wxPoint startRelativePositionVector = twoPointVector( m_ArcStart, relativePosition );
wxPoint centerStartVector = twoPointVector( m_Pos, m_ArcStart );
wxPoint centerEndVector = twoPointVector( m_Pos, m_ArcEnd );
wxPoint centerRelativePositionVector = twoPointVector( m_Pos, relativePosition );
// Compute the cross product to check if the point is in the sector
double crossProductStart = CrossProduct( centerStartVector, centerRelativePositionVector );
double crossProductEnd = CrossProduct( centerEndVector, centerRelativePositionVector );
// The cross products need to be exchanged, depending on which side the center point
// relative to the start point to end point vector lies
if( CrossProduct( startEndVector, startRelativePositionVector ) < 0 )
{
std::swap( crossProductStart, crossProductEnd );
}
// When the cross products have a different sign, the point lies in sector
// also check, if the reference is near start or end point
return HitTestPoints( m_ArcStart, relativePosition, MINIMUM_SELECTION_DISTANCE ) ||
HitTestPoints( m_ArcEnd, relativePosition, MINIMUM_SELECTION_DISTANCE ) ||
( crossProductStart <= 0 && crossProductEnd >= 0 );
}
EDA_ITEM* LIB_ARC::Clone() const
{
return new LIB_ARC( *this );
}
int LIB_ARC::compare( const LIB_ITEM& aOther ) const
{
wxASSERT( aOther.Type() == LIB_ARC_T );
const LIB_ARC* tmp = ( LIB_ARC* ) &aOther;
if( m_Pos.x != tmp->m_Pos.x )
return m_Pos.x - tmp->m_Pos.x;
if( m_Pos.y != tmp->m_Pos.y )
return m_Pos.y - tmp->m_Pos.y;
if( m_t1 != tmp->m_t1 )
return m_t1 - tmp->m_t1;
if( m_t2 != tmp->m_t2 )
return m_t2 - tmp->m_t2;
return 0;
}
void LIB_ARC::SetOffset( const wxPoint& aOffset )
{
m_Pos += aOffset;
m_ArcStart += aOffset;
m_ArcEnd += aOffset;
}
bool LIB_ARC::Inside( EDA_RECT& aRect ) const
{
return aRect.Contains( m_ArcStart.x, -m_ArcStart.y )
|| aRect.Contains( m_ArcEnd.x, -m_ArcEnd.y );
}
void LIB_ARC::Move( const wxPoint& aPosition )
{
wxPoint offset = aPosition - m_Pos;
m_Pos = aPosition;
m_ArcStart += offset;
m_ArcEnd += offset;
}
void LIB_ARC::MirrorHorizontal( const wxPoint& aCenter )
{
m_Pos.x -= aCenter.x;
m_Pos.x *= -1;
m_Pos.x += aCenter.x;
m_ArcStart.x -= aCenter.x;
m_ArcStart.x *= -1;
m_ArcStart.x += aCenter.x;
m_ArcEnd.x -= aCenter.x;
m_ArcEnd.x *= -1;
m_ArcEnd.x += aCenter.x;
std::swap( m_ArcStart, m_ArcEnd );
std::swap( m_t1, m_t2 );
m_t1 = 1800 - m_t1;
m_t2 = 1800 - m_t2;
if( m_t1 > 3600 || m_t2 > 3600 )
{
m_t1 -= 3600;
m_t2 -= 3600;
}
else if( m_t1 < -3600 || m_t2 < -3600 )
{
m_t1 += 3600;
m_t2 += 3600;
}
}
void LIB_ARC::MirrorVertical( const wxPoint& aCenter )
{
m_Pos.y -= aCenter.y;
m_Pos.y *= -1;
m_Pos.y += aCenter.y;
m_ArcStart.y -= aCenter.y;
m_ArcStart.y *= -1;
m_ArcStart.y += aCenter.y;
m_ArcEnd.y -= aCenter.y;
m_ArcEnd.y *= -1;
m_ArcEnd.y += aCenter.y;
std::swap( m_ArcStart, m_ArcEnd );
std::swap( m_t1, m_t2 );
m_t1 = - m_t1;
m_t2 = - m_t2;
if( m_t1 > 3600 || m_t2 > 3600 )
{
m_t1 -= 3600;
m_t2 -= 3600;
}
else if( m_t1 < -3600 || m_t2 < -3600 )
{
m_t1 += 3600;
m_t2 += 3600;
}
}
void LIB_ARC::Rotate( const wxPoint& aCenter, bool aRotateCCW )
{
int rot_angle = aRotateCCW ? -900 : 900;
RotatePoint( &m_Pos, aCenter, rot_angle );
RotatePoint( &m_ArcStart, aCenter, rot_angle );
RotatePoint( &m_ArcEnd, aCenter, rot_angle );
m_t1 -= rot_angle;
m_t2 -= rot_angle;
if( m_t1 > 3600 || m_t2 > 3600 )
{
m_t1 -= 3600;
m_t2 -= 3600;
}
else if( m_t1 < -3600 || m_t2 < -3600 )
{
m_t1 += 3600;
m_t2 += 3600;
}
}
void LIB_ARC::Plot( PLOTTER* aPlotter, const wxPoint& aOffset, bool aFill,
const TRANSFORM& aTransform )
{
wxASSERT( aPlotter != NULL );
int t1 = m_t1;
int t2 = m_t2;
wxPoint pos = aTransform.TransformCoordinate( m_Pos ) + aOffset;
aTransform.MapAngles( &t1, &t2 );
if( aFill && m_Fill == FILLED_WITH_BG_BODYCOLOR )
{
aPlotter->SetColor( GetLayerColor( LAYER_DEVICE_BACKGROUND ) );
aPlotter->Arc( pos, -t2, -t1, m_Radius, FILLED_WITH_BG_BODYCOLOR, 0 );
}
bool already_filled = m_Fill == FILLED_WITH_BG_BODYCOLOR;
aPlotter->SetColor( GetLayerColor( LAYER_DEVICE ) );
aPlotter->Arc( pos, -t2, -t1, m_Radius, already_filled ? NO_FILL : m_Fill, GetPenSize() );
}
int LIB_ARC::GetPenSize() const
{
if( m_Width > 0 )
return m_Width;
if( m_Width == 0 )
return GetDefaultLineThickness();
return -1; // a value to use a minimal pen size
}
void LIB_ARC::drawEditGraphics( EDA_RECT* aClipBox, wxDC* aDC, COLOR4D aColor )
{
// The edit indicators only get drawn when a new arc is being drawn.
if( !IsNew() )
return;
// Use the last edit state so when the drawing switches from the end mode to the center
// point mode, the last line between the center points gets erased.
if( m_lastEditState == 1 )
{
GRLine( aClipBox, aDC, m_ArcStart.x, -m_ArcStart.y, m_ArcEnd.x, -m_ArcEnd.y, 0, aColor );
}
else
{
GRDashedLine( aClipBox, aDC, m_ArcStart.x, -m_ArcStart.y, m_Pos.x, -m_Pos.y, 0, aColor );
GRDashedLine( aClipBox, aDC, m_ArcEnd.x, -m_ArcEnd.y, m_Pos.x, -m_Pos.y, 0, aColor );
}
}
void LIB_ARC::drawGraphic( EDA_DRAW_PANEL* aPanel, wxDC* aDC, const wxPoint& aOffset,
COLOR4D aColor, GR_DRAWMODE aDrawMode, void* aData,
const TRANSFORM& aTransform )
{
// Don't draw the arc until the end point is selected. Only the edit indicators
// get drawn at this time.
if( IsNew() && m_lastEditState == 1 )
return;
wxPoint pos1, pos2, posc;
COLOR4D color = GetLayerColor( LAYER_DEVICE );
if( aColor == COLOR4D::UNSPECIFIED ) // Used normal color or selected color
{
if( IsSelected() )
color = GetItemSelectedColor();
}
else
{
color = aColor;
}
pos1 = aTransform.TransformCoordinate( m_ArcEnd ) + aOffset;
pos2 = aTransform.TransformCoordinate( m_ArcStart ) + aOffset;
posc = aTransform.TransformCoordinate( m_Pos ) + aOffset;
int pt1 = m_t1;
int pt2 = m_t2;
bool swap = aTransform.MapAngles( &pt1, &pt2 );
if( swap )
{
std::swap( pos1.x, pos2.x );
std::swap( pos1.y, pos2.y );
}
GRSetDrawMode( aDC, aDrawMode );
FILL_T fill = aData ? NO_FILL : m_Fill;
if( aColor != COLOR4D::UNSPECIFIED )
fill = NO_FILL;
EDA_RECT* const clipbox = aPanel? aPanel->GetClipBox() : NULL;
if( fill == FILLED_WITH_BG_BODYCOLOR )
{
GRFilledArc( clipbox, aDC, posc.x, posc.y, pt1, pt2,
m_Radius, GetPenSize( ),
(m_Flags & IS_MOVED) ? color : GetLayerColor( LAYER_DEVICE_BACKGROUND ),
GetLayerColor( LAYER_DEVICE_BACKGROUND ) );
}
else if( fill == FILLED_SHAPE && !aData )
{
GRFilledArc( clipbox, aDC, posc.x, posc.y, pt1, pt2, m_Radius,
color, color );
}
else
{
#ifdef DRAW_ARC_WITH_ANGLE
GRArc( clipbox, aDC, posc.x, posc.y, pt1, pt2, m_Radius,
GetPenSize(), color );
#else
GRArc1( clipbox, aDC, pos1.x, pos1.y, pos2.x, pos2.y,
posc.x, posc.y, GetPenSize(), color );
#endif
}
/* Set to one (1) to draw bounding box around arc to validate bounding box
* calculation. */
#if 0
EDA_RECT bBox = GetBoundingBox();
bBox.RevertYAxis();
bBox = aTransform.TransformCoordinate( bBox );
bBox.Move( aOffset );
GRRect( clipbox, aDC, bBox, 0, LIGHTMAGENTA );
#endif
}
const EDA_RECT LIB_ARC::GetBoundingBox() const
{
int minX, minY, maxX, maxY, angleStart, angleEnd;
EDA_RECT rect;
wxPoint nullPoint, startPos, endPos, centerPos;
wxPoint normStart = m_ArcStart - m_Pos;
wxPoint normEnd = m_ArcEnd - m_Pos;
if( ( normStart == nullPoint ) || ( normEnd == nullPoint ) || ( m_Radius == 0 ) )
{
wxLogDebug( wxT("Invalid arc drawing definition, center(%d, %d) \
start(%d, %d), end(%d, %d), radius %d" ),
m_Pos.x, m_Pos.y, m_ArcStart.x, m_ArcStart.y, m_ArcEnd.x,
m_ArcEnd.y, m_Radius );
return rect;
}
endPos = DefaultTransform.TransformCoordinate( m_ArcEnd );
startPos = DefaultTransform.TransformCoordinate( m_ArcStart );
centerPos = DefaultTransform.TransformCoordinate( m_Pos );
angleStart = m_t1;
angleEnd = m_t2;
if( DefaultTransform.MapAngles( &angleStart, &angleEnd ) )
{
std::swap( endPos.x, startPos.x );
std::swap( endPos.y, startPos.y );
}
/* Start with the start and end point of the arc. */
minX = std::min( startPos.x, endPos.x );
minY = std::min( startPos.y, endPos.y );
maxX = std::max( startPos.x, endPos.x );
maxY = std::max( startPos.y, endPos.y );
/* Zero degrees is a special case. */
if( angleStart == 0 )
maxX = centerPos.x + m_Radius;
/* Arc end angle wrapped passed 360. */
if( angleStart > angleEnd )
angleEnd += 3600;
if( angleStart <= 900 && angleEnd >= 900 ) /* 90 deg */
maxY = centerPos.y + m_Radius;
if( angleStart <= 1800 && angleEnd >= 1800 ) /* 180 deg */
minX = centerPos.x - m_Radius;
if( angleStart <= 2700 && angleEnd >= 2700 ) /* 270 deg */
minY = centerPos.y - m_Radius;
if( angleStart <= 3600 && angleEnd >= 3600 ) /* 0 deg */
maxX = centerPos.x + m_Radius;
rect.SetOrigin( minX, minY );
rect.SetEnd( maxX, maxY );
rect.Inflate( ( GetPenSize()+1 ) / 2 );
return rect;
}
void LIB_ARC::GetMsgPanelInfo( EDA_UNITS_T aUnits, std::vector< MSG_PANEL_ITEM >& aList )
{
wxString msg;
EDA_RECT bBox = GetBoundingBox();
LIB_ITEM::GetMsgPanelInfo( aUnits, aList );
msg = MessageTextFromValue( aUnits, m_Width, true );
aList.push_back( MSG_PANEL_ITEM( _( "Line Width" ), msg, BLUE ) );
msg.Printf( wxT( "(%d, %d, %d, %d)" ), bBox.GetOrigin().x,
bBox.GetOrigin().y, bBox.GetEnd().x, bBox.GetEnd().y );
aList.push_back( MSG_PANEL_ITEM( _( "Bounding Box" ), msg, BROWN ) );
}
wxString LIB_ARC::GetSelectMenuText( EDA_UNITS_T aUnits ) const
{
return wxString::Format( _( "Arc center (%s, %s), radius %s" ),
MessageTextFromValue( aUnits, m_Pos.x ),
MessageTextFromValue( aUnits, m_Pos.y ),
MessageTextFromValue( aUnits, m_Radius ) );
}
BITMAP_DEF LIB_ARC::GetMenuImage() const
{
return add_arc_xpm;
}
void LIB_ARC::BeginEdit( STATUS_FLAGS aEditMode, const wxPoint aPosition )
{
wxCHECK_RET( ( aEditMode & ( IS_NEW | IS_MOVED | IS_RESIZED ) ) != 0,
wxT( "Invalid edit mode for LIB_ARC object." ) );
if( aEditMode == IS_NEW )
{
m_ArcStart = m_ArcEnd = aPosition;
m_editState = m_lastEditState = 1;
}
else if( aEditMode == IS_MOVED )
{
m_initialPos = m_Pos;
m_initialCursorPos = aPosition;
}
else
{
// The arc center point has to be rotated with while adjusting the
// start or end point, determine the side of this point and the distance
// from the start / end point
wxPoint middlePoint = wxPoint( (m_ArcStart.x + m_ArcEnd.x) / 2,
(m_ArcStart.y + m_ArcEnd.y) / 2 );
wxPoint centerVector = m_Pos - middlePoint;
wxPoint startEndVector = twoPointVector( m_ArcStart, m_ArcEnd );
m_editCenterDistance = EuclideanNorm( centerVector );
// Determine on which side is the center point
m_editDirection = CrossProduct( startEndVector, centerVector ) ? 1 : -1;
// Drag either the start, end point or the outline
if( HitTestPoints( m_ArcStart, aPosition, MINIMUM_SELECTION_DISTANCE ) )
{
m_editSelectPoint = ARC_STATUS_START;
}
else if( HitTestPoints( m_ArcEnd, aPosition, MINIMUM_SELECTION_DISTANCE ) )
{
m_editSelectPoint = ARC_STATUS_END;
}
else
{
m_editSelectPoint = ARC_STATUS_OUTLINE;
}
m_editState = 0;
}
m_Flags = aEditMode;
}
bool LIB_ARC::ContinueEdit( const wxPoint aPosition )
{
wxCHECK_MSG( ( m_Flags & ( IS_NEW | IS_MOVED | IS_RESIZED ) ) != 0, false,
wxT( "Bad call to ContinueEdit(). LIB_ARC is not being edited." ) );
if( m_Flags == IS_NEW )
{
if( m_editState == 1 ) // Second position yields the arc segment length.
{
m_ArcEnd = aPosition;
m_editState = 2;
return true; // Need third position to calculate center point.
}
}
return false;
}
void LIB_ARC::EndEdit( const wxPoint& aPosition, bool aAbort )
{
wxCHECK_RET( ( m_Flags & ( IS_NEW | IS_MOVED | IS_RESIZED ) ) != 0,
wxT( "Bad call to EndEdit(). LIB_ARC is not being edited." ) );
m_lastEditState = 0;
m_editState = 0;
m_Flags = 0;
}
void LIB_ARC::CalcEdit( const wxPoint& aPosition )
{
if( m_Flags == IS_RESIZED )
{
wxPoint newCenterPoint, startPos, endPos;
// Choose the point of the arc to be adjusted
if( m_editSelectPoint == ARC_STATUS_START )
{
startPos = aPosition;
endPos = m_ArcEnd;
}
else if( m_editSelectPoint == ARC_STATUS_END )
{
endPos = aPosition;
startPos = m_ArcStart;
}
else
{
// Use the cursor for adjusting the arc curvature
startPos = m_ArcStart;
endPos = m_ArcEnd;
// If the distance is too small, use the old center point
// else the new center point is calculated over the three points start/end/cursor
if( DistanceLinePoint( startPos, endPos, aPosition ) > MINIMUM_SELECTION_DISTANCE )
{
newCenterPoint = calcCenter( startPos, aPosition, endPos );
}
else
{
newCenterPoint = m_Pos;
}
// Determine if the arc angle is larger than 180 degrees -> this happens if both
// points (cursor position, center point) lie on the same side of the vector
// start-end
double crossA = CrossProduct( twoPointVector( startPos, endPos ),
twoPointVector( endPos, aPosition ) );
double crossB = CrossProduct( twoPointVector( startPos, endPos ),
twoPointVector( endPos, newCenterPoint ) );
if( ( crossA < 0 && crossB < 0 ) || ( crossA >= 0 && crossB >= 0 ) )
newCenterPoint = m_Pos;
}
if( m_editSelectPoint == ARC_STATUS_START || m_editSelectPoint == ARC_STATUS_END )
{
// Compute the new center point when the start/end points are modified
wxPoint middlePoint = wxPoint( (startPos.x + endPos.x) / 2,
(startPos.y + endPos.y) / 2 );
wxPoint startEndVector = twoPointVector( startPos, endPos );
wxPoint perpendicularVector = wxPoint( -startEndVector.y, startEndVector.x );
double lengthPerpendicularVector = EuclideanNorm( perpendicularVector );
// prevent too large values, division / 0
if( lengthPerpendicularVector < 1e-1 )
lengthPerpendicularVector = 1e-1;
perpendicularVector.x = (int) ( (double) perpendicularVector.x *
m_editCenterDistance /
lengthPerpendicularVector ) * m_editDirection;
perpendicularVector.y = (int) ( (double) perpendicularVector.y *
m_editCenterDistance /
lengthPerpendicularVector ) * m_editDirection;
newCenterPoint = middlePoint + perpendicularVector;
m_ArcStart = startPos;
m_ArcEnd = endPos;
}
m_Pos = newCenterPoint;
CalcRadiusAngles();
}
else if( m_Flags == IS_NEW )
{
if( m_editState == 1 )
{
m_ArcEnd = aPosition;
}
if( m_editState != m_lastEditState )
m_lastEditState = m_editState;
// Keep the arc center point up to date. Otherwise, there will be edit graphic
// artifacts left behind from the initial draw.
int dx, dy;
int cX, cY;
double angle;
cX = aPosition.x;
cY = aPosition.y;
dx = m_ArcEnd.x - m_ArcStart.x;
dy = m_ArcEnd.y - m_ArcStart.y;
cX -= m_ArcStart.x;
cY -= m_ArcStart.y;
angle = ArcTangente( dy, dx );
RotatePoint( &dx, &dy, angle ); /* The segment dx, dy is horizontal
* -> Length = dx, dy = 0 */
RotatePoint( &cX, &cY, angle );
cX = dx / 2; /* cX, cY is on the median segment 0.0 a dx, 0 */
RotatePoint( &cX, &cY, -angle );
cX += m_ArcStart.x;
cY += m_ArcStart.y;
m_Pos.x = cX;
m_Pos.y = cY;
CalcRadiusAngles();
}
else if( m_Flags == IS_MOVED )
{
Move( m_initialPos + aPosition - m_initialCursorPos );
}
}
void LIB_ARC::CalcRadiusAngles()
{
wxPoint centerStartVector = twoPointVector( m_Pos, m_ArcStart );
wxPoint centerEndVector = twoPointVector( m_Pos, m_ArcEnd );
m_Radius = KiROUND( EuclideanNorm( centerStartVector ) );
// Angles in eeschema are still integers
m_t1 = KiROUND( ArcTangente( centerStartVector.y, centerStartVector.x ) );
m_t2 = KiROUND( ArcTangente( centerEndVector.y, centerEndVector.x ) );
NORMALIZE_ANGLE_POS( m_t1 );
NORMALIZE_ANGLE_POS( m_t2 ); // angles = 0 .. 3600
// Restrict angle to less than 180 to avoid PBS display mirror Trace because it is
// assumed that the arc is less than 180 deg to find orientation after rotate or mirror.
if( (m_t2 - m_t1) > 1800 )
m_t2 -= 3600;
else if( (m_t2 - m_t1) <= -1800 )
m_t2 += 3600;
while( (m_t2 - m_t1) >= 1800 )
{
m_t2--;
m_t1++;
}
while( (m_t1 - m_t2) >= 1800 )
{
m_t2++;
m_t1--;
}
NORMALIZE_ANGLE_POS( m_t1 );
if( !IsMoving() )
NORMALIZE_ANGLE_POS( m_t2 );
}
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