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Correct Cairo GAL dot rendering 

This matches the OpenGL dot rendering.  Patch from dsa-t with minor
changes

Fixes https://gitlab.com/kicad/code/kicad/issues/5832
This commit is contained in:
Seth Hillbrand 2020-10-21 12:27:51 -07:00
parent 69d47c90ea
commit ae1004776f
2 changed files with 26 additions and 16 deletions
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40
common/gal/cairo/cairo_gal.cpp
View File

@ -37,6 +37,7 @@
#include <bitmap_base.h>
#include <algorithm>
#include <cmath>
#include <limits>
#include <pixman.h>
@ -999,12 +1000,12 @@ void CAIRO_GAL_BASE::drawGridCross( const VECTOR2D& aPoint )
{
syncLineWidth();
VECTOR2D offset( 0, 0 );
auto size = 2.0 * lineWidthInPixels;
double size = 2.0 * lineWidthInPixels + 0.5;
auto p0 = roundp( xform( aPoint ) ) - VECTOR2D( size, 0 ) + offset;
auto p1 = roundp( xform( aPoint ) ) + VECTOR2D( size, 0 ) + offset;
auto p2 = roundp( xform( aPoint ) ) - VECTOR2D( 0, size ) + offset;
auto p3 = roundp( xform( aPoint ) ) + VECTOR2D( 0, size ) + offset;
VECTOR2D p0 = roundp( xform( aPoint ) ) - VECTOR2D( size, 0 ) + offset;
VECTOR2D p1 = roundp( xform( aPoint ) ) + VECTOR2D( size, 0 ) + offset;
VECTOR2D p2 = roundp( xform( aPoint ) ) - VECTOR2D( 0, size ) + offset;
VECTOR2D p3 = roundp( xform( aPoint ) ) + VECTOR2D( 0, size ) + offset;
cairo_set_source_rgba( currentContext, gridColor.r, gridColor.g, gridColor.b, gridColor.a );
cairo_move_to( currentContext, p0.x, p0.y );
@ -1015,15 +1016,16 @@ void CAIRO_GAL_BASE::drawGridCross( const VECTOR2D& aPoint )
}
void CAIRO_GAL_BASE::drawGridPoint( const VECTOR2D& aPoint, double aSize )
void CAIRO_GAL_BASE::drawGridPoint( const VECTOR2D& aPoint, double aWidth, double aHeight )
{
auto p = roundp( xform( aPoint ) );
auto s = std::max( 1.0, xform( aSize / 2.0 ) );
VECTOR2D p = roundp( xform( aPoint ) );
double sw = std::max( 1.0, aWidth );
double sh = std::max( 1.0, aHeight );
cairo_set_source_rgba( currentContext, gridColor.r, gridColor.g, gridColor.b, gridColor.a );
cairo_move_to( currentContext, p.x, p.y );
cairo_arc( currentContext, p.x, p.y, s, 0.0, 2.0 * M_PI );
cairo_close_path( currentContext );
cairo_rectangle( currentContext, p.x - std::floor( sw / 2 ) - 0.5,
p.y - std::floor( sh / 2 ) - 0.5, sw, sh );
cairo_fill( currentContext );
}
@ -1621,6 +1623,8 @@ void CAIRO_GAL_BASE::DrawGrid()
}
else // Dots or Crosses grid
{
lineWidthIsOdd = true;
isStrokeEnabled = true;
for( int j = gridStartY; j <= gridEndY; j++ )
{
bool tickY = ( j % gridTick == 0 );
@ -1628,14 +1632,20 @@ void CAIRO_GAL_BASE::DrawGrid()
for( int i = gridStartX; i <= gridEndX; i++ )
{
bool tickX = ( i % gridTick == 0 );
SetLineWidth( ( ( tickX && tickY ) ? doubleMarker : marker ) );
auto pos = VECTOR2D( i * gridScreenSize.x + gridOrigin.x,
j * gridScreenSize.y + gridOrigin.y );
VECTOR2D pos{ i * gridScreenSize.x + gridOrigin.x,
j * gridScreenSize.y + gridOrigin.y };
if( gridStyle == GRID_STYLE::SMALL_CROSS )
{
SetLineWidth( ( tickX && tickY ) ? doubleMarker : marker );
drawGridCross( pos );
}
else if( gridStyle == GRID_STYLE::DOTS )
drawGridPoint( pos, GetLineWidth() );
{
double doubleGridLineWidth = gridLineWidth * 2.0f;
drawGridPoint( pos, ( tickX ) ? doubleGridLineWidth : gridLineWidth,
( tickY ) ? doubleGridLineWidth : gridLineWidth );
}
}
}
}

2
include/gal/cairo/cairo_gal.h
View File

@ -244,7 +244,7 @@ protected:
*/
void drawGridLine( const VECTOR2D& aStartPoint, const VECTOR2D& aEndPoint );
void drawGridCross( const VECTOR2D& aPoint );
void drawGridPoint( const VECTOR2D& aPoint, double aSize );
void drawGridPoint( const VECTOR2D& aPoint, double aWidth, double aHeight );
void drawAxes( const VECTOR2D& aStartPoint, const VECTOR2D& aEndPoint );
/// Super class definition