kicad/common/preview_items/ruler_item.cpp

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/*
* This program source code file is part of KiCad, a free EDA CAD application.
*
* Copyright (C) 2017 Kicad Developers, see change_log.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
*/
#include <preview_items/ruler_item.h>
#include <preview_items/preview_utils.h>
#include <gal/graphics_abstraction_layer.h>
#include <layers_id_colors_and_visibility.h>
#include <view/view.h>
#include <pcb_painter.h>
#include <base_units.h>
#include <common.h>
using namespace KIGFX::PREVIEW;
static const double maxTickDensity = 10.0; // min pixels between tick marks
static const double midTickLengthFactor = 1.5;
static const double majorTickLengthFactor = 2.5;
static void drawCursorStrings( KIGFX::VIEW* aView, const VECTOR2D& aCursor,
const VECTOR2D& aRulerVec )
{
// draw the cursor labels
std::vector<wxString> cursorStrings;
cursorStrings.push_back( DimensionLabel( "r", aRulerVec.EuclideanNorm(), g_UserUnit ) );
double degs = RAD2DECIDEG( -aRulerVec.Angle() );
cursorStrings.push_back( DimensionLabel( wxString::FromUTF8( "θ" ), degs, DEGREES ) );
for( auto& str: cursorStrings )
{
// FIXME: remove spaces that choke OpenGL lp:1668455
str.erase( std::remove( str.begin(), str.end(), ' ' ), str.end() );
}
auto temp = aRulerVec;
DrawTextNextToCursor( aView, aCursor, -temp, cursorStrings );
}
/**
* Description of a "tick format" for a scale factor - how many ticks there are
* between medium/major ticks and how each scale relates to the last one
*/
struct TICK_FORMAT
{
double divisionBase; ///> multiple from the last scale
int majorStep; ///> ticks between major ticks
int midStep; ///> ticks between medium ticks (0 if no medium ticks)
};
static TICK_FORMAT getTickFormatForScale( double aScale, double& aTickSpace )
{
// simple 1/2/5 scales per decade
static std::vector<TICK_FORMAT> tickFormats =
{
{ 2, 10, 5 }, // |....:....|
{ 2, 5, 0 }, // |....|
{ 2.5, 2, 0 }, // |.|.|
};
// could start at a set number of MM, but that's not available in common
aTickSpace = 1;
// convert to a round (mod-10) number of mils
if( g_UserUnit == INCHES )
{
aTickSpace *= 2.54;
}
int tickFormat = 0;
while( true )
{
const auto pixelSpace = aTickSpace * aScale;
if( pixelSpace >= maxTickDensity )
break;
tickFormat = ( tickFormat + 1 ) % tickFormats.size();
aTickSpace *= tickFormats[tickFormat].divisionBase;
}
return tickFormats[tickFormat];
}
/**
* 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::VIEW *aView, const VECTOR2D& aOrigin,
const VECTOR2D& aLine, double aMinorTickLen )
{
VECTOR2D tickLine = aLine.Rotate( -M_PI_2 );
auto gal = aView->GetGAL();
double tickSpace;
TICK_FORMAT tickF = getTickFormatForScale( gal->GetWorldScale(), tickSpace );
auto rs = static_cast<KIGFX::PCB_RENDER_SETTINGS*>( aView->GetPainter()->GetSettings() );
// 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 )
{
gal->SetHorizontalJustify( GR_TEXT_HJUSTIFY_LEFT );
}
else
{
gal->SetHorizontalJustify( GR_TEXT_HJUSTIFY_RIGHT );
labelAngle += M_PI;
}
// text and ticks are dimmed
gal->SetStrokeColor( rs->GetLayerColor( LAYER_AUX_ITEMS ).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;
}
gal->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() );
gal->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 );
}
}
RULER_ITEM::RULER_ITEM( const TWO_POINT_GEOMETRY_MANAGER& aGeomMgr ):
EDA_ITEM( NOT_USED ), // Never added to anything - just a preview
m_geomMgr( aGeomMgr )
{}
const BOX2I RULER_ITEM::ViewBBox() const
{
BOX2I tmp;
tmp.SetOrigin( m_geomMgr.GetOrigin() );
tmp.SetEnd( m_geomMgr.GetEnd() );
tmp.Normalize();
return tmp;
}
void RULER_ITEM::ViewGetLayers( int aLayers[], int& aCount ) const
{
aLayers[0] = LAYER_GP_OVERLAY;
aCount = 1;
}
void RULER_ITEM::ViewDraw( int aLayer, KIGFX::VIEW* aView ) const
{
auto& gal = *aView->GetGAL();
auto rs = static_cast<KIGFX::RENDER_SETTINGS*>( aView->GetPainter()->GetSettings() );
const auto origin = m_geomMgr.GetOrigin();
const auto end = m_geomMgr.GetEnd();
gal.SetLineWidth( 1.0 );
gal.SetIsStroke( true );
gal.SetIsFill( false );
gal.SetTextMirrored( false );
gal.SetStrokeColor( rs->GetLayerColor( LAYER_AUX_ITEMS ) );
gal.ResetTextAttributes();
// draw the main line from the origin to cursor
gal.DrawLine( origin, end );
VECTOR2D rulerVec( end - origin );
// constant text size on screen
SetConstantGlyphHeight( gal, 14.0 );
drawCursorStrings( aView, end, rulerVec );
// tick label size
SetConstantGlyphHeight( gal, 12.0 );
// basic tick size
const double minorTickLen = 5.0 / gal.GetWorldScale();
drawTicksAlongLine( aView, origin, rulerVec, minorTickLen );
gal.SetStrokeColor( rs->GetLayerColor( LAYER_AUX_ITEMS ).WithAlpha( PreviewOverlayDeemphAlpha( true ) ) );
drawBacksideTicks( gal, origin, rulerVec, minorTickLen * majorTickLengthFactor, 2 );
// draw the back of the origin "crosshair"
gal.DrawLine( origin, origin + rulerVec.Resize( -minorTickLen * midTickLengthFactor ) );
}