273 lines
8.1 KiB
C++
273 lines
8.1 KiB
C++
/*
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* This program source code file is part of KiCad, a free EDA CAD application.
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*
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* Copyright (C) 2017 Kicad Developers, see change_log.txt for contributors.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, you may find one here:
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* http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
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* or you may search the http://www.gnu.org website for the version 2 license,
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* or you may write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
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*/
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#include <preview_items/ruler_item.h>
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#include <preview_items/preview_utils.h>
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#include <gal/graphics_abstraction_layer.h>
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#include <layers_id_colors_and_visibility.h>
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#include <view/view.h>
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#include <pcb_painter.h>
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#include <base_units.h>
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#include <common.h>
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using namespace KIGFX::PREVIEW;
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static const double maxTickDensity = 10.0; // min pixels between tick marks
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static const double midTickLengthFactor = 1.5;
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static const double majorTickLengthFactor = 2.5;
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static void drawCursorStrings( KIGFX::VIEW* aView, const VECTOR2D& aCursor,
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const VECTOR2D& aRulerVec )
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{
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// draw the cursor labels
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std::vector<wxString> cursorStrings;
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cursorStrings.push_back( DimensionLabel( "r", aRulerVec.EuclideanNorm(), g_UserUnit ) );
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double degs = RAD2DECIDEG( -aRulerVec.Angle() );
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cursorStrings.push_back( DimensionLabel( "θ", degs, DEGREES ) );
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for( auto& str: cursorStrings )
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{
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// FIXME: remove spaces that choke OpenGL lp:1668455
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str.erase( std::remove( str.begin(), str.end(), ' ' ), str.end() );
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}
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auto temp = aRulerVec;
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DrawTextNextToCursor( aView, aCursor, -temp, cursorStrings );
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}
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/**
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* Description of a "tick format" for a scale factor - how many ticks there are
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* between medium/major ticks and how each scale relates to the last one
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*/
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struct TICK_FORMAT
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{
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double divisionBase; ///> multiple from the last scale
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int majorStep; ///> ticks between major ticks
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int midStep; ///> ticks between medium ticks (0 if no medium ticks)
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};
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static TICK_FORMAT getTickFormatForScale( double aScale, double& aTickSpace )
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{
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// simple 1/2/5 scales per decade
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static std::vector<TICK_FORMAT> tickFormats =
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{
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{ 2, 10, 5 }, // |....:....|
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{ 2, 5, 0 }, // |....|
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{ 2.5, 2, 0 }, // |.|.|
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};
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// could start at a set number of MM, but that's not available in common
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aTickSpace = 1;
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// convert to a round (mod-10) number of mils
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if( g_UserUnit == INCHES )
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{
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aTickSpace *= 2.54;
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}
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int tickFormat = 0;
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while( true )
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{
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const auto pixelSpace = aTickSpace * aScale;
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if( pixelSpace >= maxTickDensity )
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break;
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tickFormat = ( tickFormat + 1 ) % tickFormats.size();
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aTickSpace *= tickFormats[tickFormat].divisionBase;
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}
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return tickFormats[tickFormat];
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}
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/**
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* Draw labelled ticks on a line. Ticks are spaced according to a
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* maximum density. Miror ticks are not labelled.
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*
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* @param aGal the GAL to draw on
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* @param aOrigin start of line to draw ticks on
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* @param aLine line vector
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* @param aMinorTickLen length of minor ticks in IU
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*/
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void drawTicksAlongLine( KIGFX::VIEW *aView, const VECTOR2D& aOrigin,
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const VECTOR2D& aLine, double aMinorTickLen )
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{
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VECTOR2D tickLine = aLine.Rotate( -M_PI_2 );
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auto gal = aView->GetGAL();
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double tickSpace;
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TICK_FORMAT tickF = getTickFormatForScale( gal->GetWorldScale(), tickSpace );
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auto rs = static_cast<KIGFX::PCB_RENDER_SETTINGS*>( aView->GetPainter()->GetSettings() );
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// number of ticks in whole ruler
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int numTicks = (int) std::ceil( aLine.EuclideanNorm() / tickSpace );
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// work out which way up the tick labels go
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double labelAngle = -tickLine.Angle();
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if( aLine.Angle() > 0 )
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{
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gal->SetHorizontalJustify( GR_TEXT_HJUSTIFY_LEFT );
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}
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else
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{
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gal->SetHorizontalJustify( GR_TEXT_HJUSTIFY_RIGHT );
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labelAngle += M_PI;
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}
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// text and ticks are dimmed
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gal->SetStrokeColor( rs->GetLayerColor( LAYER_AUX_ITEMS ).WithAlpha( PreviewOverlayDeemphAlpha( true ) ) );
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const auto labelOffset = tickLine.Resize( aMinorTickLen * ( majorTickLengthFactor + 1 ) );
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for( int i = 0; i < numTicks; ++i )
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{
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const auto tickPos = aOrigin + aLine.Resize( tickSpace * i );
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double length = aMinorTickLen;
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bool drawLabel = false;
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if( i % tickF.majorStep == 0)
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{
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drawLabel = true;
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length *= majorTickLengthFactor;
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}
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else if( tickF.midStep && i % tickF.midStep == 0 )
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{
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drawLabel = true;
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length *= midTickLengthFactor;
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}
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gal->DrawLine( tickPos, tickPos + tickLine.Resize( length ) );
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if( drawLabel )
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{
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wxString label = DimensionLabel( "", tickSpace * i, g_UserUnit );
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// FIXME: spaces choke OpenGL lp:1668455
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label.erase( std::remove( label.begin(), label.end(), ' ' ), label.end() );
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gal->BitmapText( label, tickPos + labelOffset, labelAngle );
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}
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}
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}
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/**
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* Draw simple ticks on the back of a line such that the line is
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* divided into n parts.
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*
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* @param aGal the GAL to draw on
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* @param aOrigin start of line to draw ticks on
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* @param aLine line vector
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* @param aTickLen length of ticks in IU
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* @param aNumDivisions number of parts to divide the line into
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*/
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void drawBacksideTicks( KIGFX::GAL& aGal, const VECTOR2D& aOrigin,
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const VECTOR2D& aLine, double aTickLen, int aNumDivisions )
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{
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const double backTickSpace = aLine.EuclideanNorm() / aNumDivisions;
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const auto backTickVec = aLine.Rotate( M_PI_2 ).Resize( aTickLen );
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for( int i = 0; i < aNumDivisions + 1; ++i )
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{
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const auto backTickPos = aOrigin + aLine.Resize( backTickSpace * i );
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aGal.DrawLine( backTickPos, backTickPos + backTickVec );
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}
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}
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RULER_ITEM::RULER_ITEM( const TWO_POINT_GEOMETRY_MANAGER& aGeomMgr ):
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EDA_ITEM( NOT_USED ), // Never added to anything - just a preview
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m_geomMgr( aGeomMgr )
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{}
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const BOX2I RULER_ITEM::ViewBBox() const
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{
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BOX2I tmp;
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tmp.SetOrigin( m_geomMgr.GetOrigin() );
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tmp.SetEnd( m_geomMgr.GetEnd() );
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tmp.Normalize();
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return tmp;
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}
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void RULER_ITEM::ViewGetLayers( int aLayers[], int& aCount ) const
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{
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aLayers[0] = LAYER_GP_OVERLAY;
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aCount = 1;
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}
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void RULER_ITEM::ViewDraw( int aLayer, KIGFX::VIEW* aView ) const
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{
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auto& gal = *aView->GetGAL();
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auto rs = static_cast<KIGFX::RENDER_SETTINGS*>( aView->GetPainter()->GetSettings() );
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const auto origin = m_geomMgr.GetOrigin();
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const auto end = m_geomMgr.GetEnd();
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gal.SetLineWidth( 1.0 );
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gal.SetIsStroke( true );
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gal.SetIsFill( false );
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gal.SetTextMirrored( false );
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gal.SetStrokeColor( rs->GetLayerColor( LAYER_AUX_ITEMS ) );
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gal.ResetTextAttributes();
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// draw the main line from the origin to cursor
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gal.DrawLine( origin, end );
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VECTOR2D rulerVec( end - origin );
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// constant text size on screen
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SetConstantGlyphHeight( gal, 14.0 );
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drawCursorStrings( aView, end, rulerVec );
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// tick label size
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SetConstantGlyphHeight( gal, 12.0 );
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// basic tick size
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const double minorTickLen = 5.0 / gal.GetWorldScale();
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drawTicksAlongLine( aView, origin, rulerVec, minorTickLen );
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gal.SetStrokeColor( rs->GetLayerColor( LAYER_AUX_ITEMS ).WithAlpha( PreviewOverlayDeemphAlpha( true ) ) );
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drawBacksideTicks( gal, origin, rulerVec, minorTickLen * majorTickLengthFactor, 2 );
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// draw the back of the origin "crosshair"
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gal.DrawLine( origin, origin + rulerVec.Resize( -minorTickLen * midTickLengthFactor ) );
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}
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