/**
* Draw labelled ticks on a line. Ticks are spaced according to a
* maximum density. Miror ticks are not labelled.
*
* @param aGal the GAL to draw on
* @param aOrigin start of line to draw ticks on
* @param aLine line vector
* @param aMinorTickLen length of minor ticks in IU
*/
void drawTicksAlongLine( KIGFX::GAL& aGal, const VECTOR2D& aOrigin,
const VECTOR2D& aLine, double aMinorTickLen )
{
VECTOR2D tickLine = aLine.Rotate( -M_PI_2 );
double tickSpace;
TICK_FORMAT tickF = getTickFormatForScale( aGal.GetWorldScale(), tickSpace );
// number of ticks in whole ruler
int numTicks = (int) std::ceil( aLine.EuclideanNorm() / tickSpace );
// work out which way up the tick labels go
double labelAngle = -tickLine.Angle();
if( aLine.Angle() > 0 )
{
aGal.SetHorizontalJustify( GR_TEXT_HJUSTIFY_LEFT );
}
else
{
aGal.SetHorizontalJustify( GR_TEXT_HJUSTIFY_RIGHT );
labelAngle += M_PI;
}
// text and ticks are dimmed
aGal.SetStrokeColor( PreviewOverlayDefaultColor().WithAlpha( PreviewOverlayDeemphAlpha( true ) ) );
const auto labelOffset = tickLine.Resize( aMinorTickLen * ( majorTickLengthFactor + 1 ) );
for( int i = 0; i < numTicks; ++i )
{
const auto tickPos = aOrigin + aLine.Resize( tickSpace * i );
double length = aMinorTickLen;
bool drawLabel = false;
if( i % tickF.majorStep == 0)
{
drawLabel = true;
length *= majorTickLengthFactor;
}
else if( tickF.midStep && i % tickF.midStep == 0 )
{
drawLabel = true;
length *= midTickLengthFactor;
}
aGal.DrawLine( tickPos, tickPos + tickLine.Resize( length ) );
if( drawLabel )
{
wxString label = DimensionLabel( "", tickSpace * i, g_UserUnit );
// FIXME: spaces choke OpenGL lp:1668455
label.erase( std::remove( label.begin(), label.end(), ' ' ), label.end() );
aGal.BitmapText( label, tickPos + labelOffset, labelAngle );
}
}
}
/**
* Draw simple ticks on the back of a line such that the line is
* divided into n parts.
*
* @param aGal the GAL to draw on
* @param aOrigin start of line to draw ticks on
* @param aLine line vector
* @param aTickLen length of ticks in IU
* @param aNumDivisions number of parts to divide the line into
*/
void drawBacksideTicks( KIGFX::GAL& aGal, const VECTOR2D& aOrigin,
const VECTOR2D& aLine, double aTickLen, int aNumDivisions )
{
const double backTickSpace = aLine.EuclideanNorm() / aNumDivisions;
const auto backTickVec = aLine.Rotate( M_PI_2 ).Resize( aTickLen );
for( int i = 0; i < aNumDivisions + 1; ++i )
{
const auto backTickPos = aOrigin + aLine.Resize( backTickSpace * i );
aGal.DrawLine( backTickPos, backTickPos + backTickVec );
}
}