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ShapeToPolygon: implement negative inflation 

Fixes https://gitlab.com/kicad/code/kicad/-/issues/8859
This commit is contained in:
david-beinder 2021-07-27 01:34:47 +02:00 committed by Jeff Young
parent 11becc5a68
commit 3a833debea
1 changed files with 66 additions and 14 deletions
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80
libs/kimath/src/convert_basic_shapes_to_polygon.cpp
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@ -365,18 +365,64 @@ void TransformTrapezoidToPolygon( SHAPE_POLY_SET& aCornerBuffer, const wxPoint&
const wxSize& aSize, double aRotation, int aDeltaX, int aDeltaY,
int aInflate, int aError, ERROR_LOC aErrorLoc )
{
SHAPE_POLY_SET outline;
wxSize size( aSize / 2 );
SHAPE_POLY_SET outline;
wxSize size( aSize / 2 );
std::vector<ROUNDED_CORNER> corners;
corners.reserve( 4 );
corners.push_back( ROUNDED_CORNER( -size.x + aDeltaY, -size.y - aDeltaX ) );
corners.push_back( ROUNDED_CORNER( size.x - aDeltaY, -size.y + aDeltaX ) );
corners.push_back( ROUNDED_CORNER( size.x + aDeltaY, size.y - aDeltaX ) );
corners.push_back( ROUNDED_CORNER( -size.x - aDeltaY, size.y + aDeltaX ) );
if( aDeltaY == size.x || aDeltaX == size.y )
CornerListRemoveDuplicates( corners );
if( aInflate < 0 )
{
if( !aDeltaX && !aDeltaY ) // rectangle
{
size.x = std::max( 1, size.x + aInflate );
size.y = std::max( 1, size.y + aInflate );
}
else if( aDeltaX ) // horizontal trapezoid
{
double slope = (double) aDeltaX / size.x;
int yShrink = KiROUND( ( std::hypot( size.x, aDeltaX ) * aInflate ) / size.x );
size.y = std::max( 1, size.y + yShrink );
size.x = std::max( 1, size.x + aInflate );
aDeltaX = KiROUND( size.x * slope );
if( aDeltaX > size.y ) // shrinking turned the trapezoid into a triangle
{
corners.reserve( 3 );
corners.push_back( ROUNDED_CORNER( -size.x, -size.y - aDeltaX ) );
corners.push_back( ROUNDED_CORNER( KiROUND( size.y / slope ), 0 ) );
corners.push_back( ROUNDED_CORNER( -size.x, size.y + aDeltaX ) );
}
}
else // vertical trapezoid
{
double slope = (double) aDeltaY / size.y;
int xShrink = KiROUND( ( std::hypot( size.y, aDeltaY ) * aInflate ) / size.y );
size.x = std::max( 1, size.x + xShrink );
size.y = std::max( 1, size.y + aInflate );
aDeltaY = KiROUND( size.y * slope );
if( aDeltaY > size.x )
{
corners.reserve( 3 );
corners.push_back( ROUNDED_CORNER( 0, -KiROUND( size.x / slope ) ) );
corners.push_back( ROUNDED_CORNER( size.x + aDeltaY, size.y ) );
corners.push_back( ROUNDED_CORNER( -size.x - aDeltaY, size.y ) );
}
}
aInflate = 0;
}
if( corners.empty() )
{
corners.reserve( 4 );
corners.push_back( ROUNDED_CORNER( -size.x + aDeltaY, -size.y - aDeltaX ) );
corners.push_back( ROUNDED_CORNER( size.x - aDeltaY, -size.y + aDeltaX ) );
corners.push_back( ROUNDED_CORNER( size.x + aDeltaY, size.y - aDeltaX ) );
corners.push_back( ROUNDED_CORNER( -size.x - aDeltaY, size.y + aDeltaX ) );
if( aDeltaY == size.x || aDeltaX == size.y )
CornerListRemoveDuplicates( corners );
}
CornerListToPolygon( outline, corners, aInflate, aError, aErrorLoc );
@ -396,10 +442,16 @@ void TransformRoundChamferedRectToPolygon( SHAPE_POLY_SET& aCornerBuffer, const
SHAPE_POLY_SET outline;
wxSize size( aSize / 2 );
int chamferCnt = std::bitset<8>( aChamferCorners ).count();
double chamferDeduct = 0;
// Ensure size is > 0, to avoid generating unusable shapes which can crash kicad.
size.x = std::max( 1, size.x );
size.y = std::max( 1, size.y );
if( aInflate < 0 )
{
size.x = std::max( 1, size.x + aInflate );
size.y = std::max( 1, size.y + aInflate );
chamferDeduct = aInflate * ( 2.0 - M_SQRT2 );
aCornerRadius = std::max( 0, aCornerRadius + aInflate );
aInflate = 0;
}
std::vector<ROUNDED_CORNER> corners;
corners.reserve( 4 + chamferCnt );
@ -411,7 +463,7 @@ void TransformRoundChamferedRectToPolygon( SHAPE_POLY_SET& aCornerBuffer, const
if( aChamferCorners )
{
int shorterSide = std::min( aSize.x, aSize.y );
int chamfer = aChamferRatio * shorterSide;
int chamfer = std::max( 0, KiROUND( aChamferRatio * shorterSide + chamferDeduct ) );
int chamId[4] = { RECT_CHAMFER_TOP_LEFT, RECT_CHAMFER_TOP_RIGHT,
RECT_CHAMFER_BOTTOM_RIGHT, RECT_CHAMFER_BOTTOM_LEFT };
int sign[8] = { 0, 1, -1, 0, 0, -1, 1, 0 };