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kicad/common/drawtxt.cpp

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/**
* Functions to draw and plot text on screen
* @file drawtxt.cpp
*/
/*
* This program source code file is part of KiCad, a free EDA CAD application.
*
* Copyright (C) 2012 Jean-Pierre Charras, jean-pierre.charras@ujf-grenoble.fr
* Copyright (C) 2012 SoftPLC Corporation, Dick Hollenbeck <dick@softplc.com>
* Copyright (C) 2012 Wayne Stambaugh <stambaughw@verizon.net>
* Copyright (C) 1992-2012 KiCad Developers, see AUTHORS.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 <fctsys.h>
#include <gr_basic.h>
#include <common.h>
#include <plot_common.h>
#include <eda_text.h> // EDA_TEXT_HJUSTIFY_T and EDA_TEXT_VJUSTIFY_T
#include <trigo.h>
#include <macros.h>
#include <class_drawpanel.h>
#include <class_base_screen.h>
#include <newstroke_font.h>
#include <plot_common.h>
/* factor used to calculate actual size of shapes from hershey fonts
* (could be adjusted depending on the font name)
* Its value is choosen in order to have letters like M, P .. vertical size
* equal to the vertical char size parameter
* Of course some shapes can be bigger or smaller than the vertical char size
* parameter
*/
#define HERSHEY_SCALE_FACTOR 1 / 21.0
double s_HerscheyScaleFactor = HERSHEY_SCALE_FACTOR;
/* Helper function for texts with over bar
*/
int OverbarPositionY( int size_v, int thickness )
{
return KiROUND( ( (double) size_v * 1.1 ) + ( (double) thickness * 1.5 ) );
}
/**
* Function GetPensizeForBold
* @return the "best" value for a pen size to draw/plot a bold text
* @param aTextSize = the char size (height or width)
*/
int GetPenSizeForBold( int aTextSize )
{
return KiROUND( aTextSize / 5.0 );
}
/**
* Function Clamp_Text_PenSize
* As a rule, pen width should not be >1/4em, otherwise the character
* will be cluttered up in its own fatness
* so pen width max is aSize/4 for bold text, and aSize/6 for normal text
* The "best" pen width is aSize/5 for bold texts,
* so the clamp is consistant with bold option.
* @param aPenSize = the pen size to clamp
* @param aSize the char size (height or width)
* @param aBold = true if text accept bold pen size
* @return the max pen size allowed
*/
int Clamp_Text_PenSize( int aPenSize, int aSize, bool aBold )
{
int penSize = aPenSize;
double scale = aBold ? 4.0 : 6.0;
int maxWidth = KiROUND( std::abs( aSize ) / scale );
if( penSize > maxWidth )
penSize = maxWidth;
return penSize;
}
int Clamp_Text_PenSize( int aPenSize, wxSize aSize, bool aBold )
{
int size = std::min( std::abs( aSize.x ), std::abs( aSize.y ) );
return Clamp_Text_PenSize( aPenSize, size, aBold );
}
/* Functions to draw / plot a string.
* texts have only one line.
* They can be in italic.
* Horizontal and Vertical justification are handled.
* Texts can be rotated
* substrings between ~ markers can be "negated" (i.e. with an over bar
*/
/**
* Function NegableTextLength
* Return the text length (char count) of a negable string,
* excluding the ~ markers
*/
int NegableTextLength( const wxString& aText )
{
int char_count = aText.length();
// Fix the character count, removing the ~ found
for( int i = char_count - 1; i >= 0; i-- )
{
if( aText[i] == '~' )
{
// '~~' draw as '~' and count as two chars
if( i > 0 && aText[i - 1] == '~' )
i--;
else
char_count--;
}
}
return char_count;
}
/* Function GetHersheyShapeDescription
* return a pointer to the shape corresponding to unicode value AsciiCode
* Note we use the same font for Bold and Normal texts
* because KiCad handles a variable pen size to do that
* that gives better results in XOR draw mode.
*/
static const char* GetHersheyShapeDescription( int AsciiCode )
{
// calculate font length
int font_length_max = newstroke_font_bufsize;
if( AsciiCode >= (32 + font_length_max) )
AsciiCode = '?';
if( AsciiCode < 32 )
AsciiCode = 32; /* Clamp control chars */
AsciiCode -= 32;
return newstroke_font[AsciiCode];
}
int ReturnGraphicTextWidth( const wxString& aText, int aXSize, bool aItalic, bool aWidth )
{
int tally = 0;
int char_count = aText.length();
for( int i = 0; i < char_count; i++ )
{
int asciiCode = aText[i];
/* Skip the negation marks
* and first '~' char of '~~'
* ('~~' draw as '~')
*/
if( asciiCode == '~' )
{
if( i == 0 || aText[i - 1] != '~' )
continue;
}
const char* shape_ptr = GetHersheyShapeDescription( asciiCode );
// Get metrics
int xsta = *shape_ptr++ - 'R';
int xsto = *shape_ptr++ - 'R';
tally += KiROUND( aXSize * (xsto - xsta) * s_HerscheyScaleFactor );
}
// For italic correction, add 1/8 size
if( aItalic )
{
tally += KiROUND( aXSize * 0.125 );
}
return tally;
}
// Helper function for drawing character polylines
static void DrawGraphicTextPline( EDA_RECT* aClipBox,
wxDC* aDC,
EDA_COLOR_T aColor,
int aWidth,
bool aSketchMode,
int point_count,
wxPoint* coord,
void (* aCallback)( int x0, int y0, int xf, int yf ),
PLOTTER* aPlotter )
{
if( aPlotter )
{
aPlotter->MoveTo( coord[0] );
for( int ik = 1; ik < point_count; ik++ )
{
aPlotter->LineTo( coord[ik] );
}
aPlotter->PenFinish();
}
else if( aCallback )
{
for( int ik = 0; ik < (point_count - 1); ik++ )
{
aCallback( coord[ik].x, coord[ik].y,
coord[ik + 1].x, coord[ik + 1].y );
}
}
else if( aSketchMode )
{
for( int ik = 0; ik < (point_count - 1); ik++ )
GRCSegm( aClipBox, aDC, coord[ik].x, coord[ik].y,
coord[ik + 1].x, coord[ik + 1].y, aWidth, aColor );
}
else
GRPoly( aClipBox, aDC, point_count, coord, 0,
aWidth, aColor, aColor );
}
/**
* Function DrawGraphicText
* Draw a graphic text (like module texts)
* @param aPanel = the current m_canvas. NULL if draw within a 3D GL Canvas
* @param aDC = the current Device Context. NULL if draw within a 3D GL Canvas
* @param aPos = text position (according to h_justify, v_justify)
* @param aColor (enum EDA_COLOR_T) = text color
* @param aText = text to draw
* @param aOrient = angle in 0.1 degree
* @param aSize = text size (size.x or size.y can be < 0 for mirrored texts)
* @param aH_justify = horizontal justification (Left, center, right)
* @param aV_justify = vertical justification (bottom, center, top)
* @param aWidth = line width (pen width) (use default width if aWidth = 0)
* if width < 0 : draw segments in sketch mode, width = abs(width)
* Use a value min(aSize.x, aSize.y) / 5 for a bold text
* @param aItalic = true to simulate an italic font
* @param aBold = true to use a bold font. Useful only with default width value (aWidth = 0)
* @param aCallback() = function called (if non null) to draw each segment.
* used to draw 3D texts or for plotting, NULL for normal drawings
* @param aPlotter = a pointer to a PLOTTER instance, when this function is used to plot
* the text. NULL to draw this text.
*/
void DrawGraphicText( EDA_DRAW_PANEL* aPanel,
wxDC* aDC,
const wxPoint& aPos,
EDA_COLOR_T aColor,
const wxString& aText,
int aOrient,
const wxSize& aSize,
enum EDA_TEXT_HJUSTIFY_T aH_justify,
enum EDA_TEXT_VJUSTIFY_T aV_justify,
int aWidth,
bool aItalic,
bool aBold,
void (* aCallback)( int x0, int y0, int xf, int yf ),
PLOTTER* aPlotter )
{
int AsciiCode;
int x0, y0;
int size_h, size_v;
unsigned ptr;
int dx, dy; // Draw coordinate for segments to draw. also used in some other calculation
wxPoint current_char_pos; // Draw coordinates for the current char
wxPoint overbar_pos; // Start point for the current overbar
int overbar_italic_comp; // Italic compensation for overbar
EDA_RECT* clipBox; // Clip box used in basic draw functions
clipBox = aPanel ? aPanel->GetClipBox() : NULL;
#define BUF_SIZE 100
wxPoint coord[BUF_SIZE + 1]; // Buffer coordinate used to draw polylines (one char shape)
bool sketch_mode = false;
bool italic_reverse = false; // true for mirrored texts with m_Size.x < 0
size_h = aSize.x; /* PLEASE NOTE: H is for HORIZONTAL not for HEIGHT */
size_v = aSize.y;
if( aWidth == 0 && aBold ) // Use default values if aWidth == 0
aWidth = GetPenSizeForBold( std::min( aSize.x, aSize.y ) );
if( aWidth < 0 )
{
aWidth = -aWidth;
sketch_mode = true;
}
#ifdef CLIP_PEN // made by draw and plot functions
aWidth = Clamp_Text_PenSize( aWidth, aSize, aBold );
#endif
if( size_h < 0 ) // text is mirrored using size.x < 0 (mirror / Y axis)
italic_reverse = true;
unsigned char_count = NegableTextLength( aText );
if( char_count == 0 )
return;
current_char_pos = aPos;
dx = ReturnGraphicTextWidth( aText, size_h, aItalic, aWidth );
dy = size_v;
/* Do not draw the text if out of draw area! */
if( aPanel )
{
int xm, ym, ll, xc, yc;
ll = std::abs( dx );
xc = current_char_pos.x;
yc = current_char_pos.y;
x0 = aPanel->GetClipBox()->GetX() - ll;
y0 = aPanel->GetClipBox()->GetY() - ll;
xm = aPanel->GetClipBox()->GetRight() + ll;
ym = aPanel->GetClipBox()->GetBottom() + ll;
if( xc < x0 )
return;
if( yc < y0 )
return;
if( xc > xm )
return;
if( yc > ym )
return;
}
/* Compute the position of the first letter of the text
* this position is the position of the left bottom point of the letter
* this is the same as the text position only for a left and bottom justified text
* In others cases, this position must be calculated from the text position ans size
*/
switch( aH_justify )
{
case GR_TEXT_HJUSTIFY_CENTER:
current_char_pos.x -= dx / 2;
break;
case GR_TEXT_HJUSTIFY_RIGHT:
current_char_pos.x -= dx;
break;
case GR_TEXT_HJUSTIFY_LEFT:
break;
}
switch( aV_justify )
{
case GR_TEXT_VJUSTIFY_CENTER:
current_char_pos.y += dy / 2;
break;
case GR_TEXT_VJUSTIFY_TOP:
current_char_pos.y += dy;
break;
case GR_TEXT_VJUSTIFY_BOTTOM:
break;
}
// Note: if aPanel == NULL, we are using a GL Canvas that handle scaling
if( aSize.x == 0 )
return;
/* if a text size is too small, the text cannot be drawn, and it is drawn as a single
* graphic line */
if( std::abs( aSize.x ) < 3 )
{
/* draw the text as a line always vertically centered */
wxPoint end( current_char_pos.x + dx, current_char_pos.y );
RotatePoint( &current_char_pos, aPos, aOrient );
RotatePoint( &end, aPos, aOrient );
if( aPlotter )
{
aPlotter->MoveTo( current_char_pos );
aPlotter->FinishTo( end );
}
else if( aCallback )
{
aCallback( current_char_pos.x, current_char_pos.y, end.x, end.y );
}
else
GRLine( clipBox, aDC,
current_char_pos.x, current_char_pos.y, end.x, end.y, aWidth, aColor );
return;
}
if( aItalic )
{
overbar_italic_comp = OverbarPositionY( size_v, aWidth ) / 8;
if( italic_reverse )
{
overbar_italic_comp = -overbar_italic_comp;
}
}
else
{
overbar_italic_comp = 0;
}
;
int overbars = 0; /* Number of '~' seen (except '~~') */
ptr = 0; /* ptr = text index */
while( ptr < char_count )
{
if( aText[ptr + overbars] == '~' )
{
if( ptr + overbars + 1 < aText.length()
&& aText[ptr + overbars + 1] == '~' ) /* '~~' draw as '~' */
ptr++; // skip first '~' char and draw second
else
{
/* Found an overbar, adjust the pointers */
overbars++;
if( overbars & 1 ) // odd overbars count
{
// Starting the overbar
overbar_pos = current_char_pos;
overbar_pos.x += overbar_italic_comp;
overbar_pos.y -= OverbarPositionY( size_v, aWidth );
RotatePoint( &overbar_pos, aPos, aOrient );
}
else
{
// Ending the overbar
coord[0] = overbar_pos;
overbar_pos = current_char_pos;
overbar_pos.x += overbar_italic_comp;
overbar_pos.y -= OverbarPositionY( size_v, aWidth );
RotatePoint( &overbar_pos, aPos, aOrient );
coord[1] = overbar_pos;
// Plot the overbar segment
DrawGraphicTextPline( clipBox, aDC, aColor, aWidth,
sketch_mode, 2, coord, aCallback, aPlotter );
}
continue; /* Skip ~ processing */
}
}
AsciiCode = aText.GetChar( ptr + overbars );
const char* ptcar = GetHersheyShapeDescription( AsciiCode );
// Get metrics
int xsta = *ptcar++ - 'R';
int xsto = *ptcar++ - 'R';
int point_count = 0;
bool endcar = false;
while( !endcar )
{
int hc1, hc2;
hc1 = *ptcar++;
if( hc1 )
{
hc2 = *ptcar++;
}
else
{
// End of character, insert a synthetic pen up:
hc1 = ' ';
hc2 = 'R';
endcar = true;
}
// Do the Hershey decode thing:
// coordinates values are coded as <value> + 'R'
hc1 -= 'R';
hc2 -= 'R';
/* Pen up request */
if( hc1 == -50 && hc2 == 0 )
{
if( point_count )
{
if( aWidth <= 1 )
aWidth = 0;
DrawGraphicTextPline( clipBox, aDC, aColor, aWidth,
sketch_mode, point_count, coord,
aCallback, aPlotter );
}
point_count = 0;
}
else
{
wxPoint currpoint;
hc1 -= xsta; hc2 -= 11; // Align the midpoint
hc1 = KiROUND( hc1 * size_h * s_HerscheyScaleFactor );
hc2 = KiROUND( hc2 * size_v * s_HerscheyScaleFactor );
// To simulate an italic font,
// add a x offset depending on the y offset
if( aItalic )
hc1 -= KiROUND( italic_reverse ? -hc2 / 8.0 : hc2 / 8.0 );
currpoint.x = hc1 + current_char_pos.x;
currpoint.y = hc2 + current_char_pos.y;
RotatePoint( &currpoint, aPos, aOrient );
coord[point_count] = currpoint;
if( point_count < BUF_SIZE - 1 )
point_count++;
}
} // end draw 1 char
ptr++;
// Apply the advance width
current_char_pos.x += KiROUND( size_h * (xsto - xsta) * s_HerscheyScaleFactor );
}
if( overbars % 2 )
{
/* Close the last overbar */
coord[0] = overbar_pos;
overbar_pos = current_char_pos;
overbar_pos.y -= OverbarPositionY( size_v, aWidth );
RotatePoint( &overbar_pos, aPos, aOrient );
coord[1] = overbar_pos;
/* Plot the overbar segment */
DrawGraphicTextPline( clipBox, aDC, aColor, aWidth,
sketch_mode, 2, coord, aCallback, aPlotter );
}
}
/**
* Function PlotGraphicText
* same as DrawGraphicText, but plot graphic text insteed of draw it
* @param aPos = text position (according to aH_justify, aV_justify)
* @param aColor (enum EDA_COLOR_T) = text color
* @param aText = text to draw
* @param aOrient = angle in 0.1 degree
* @param aSize = text size (size.x or size.y can be < 0 for mirrored texts)
* @param aH_justify = horizontal justification (Left, center, right)
* @param aV_justify = vertical justification (bottom, center, top)
* @param aWidth = line width (pen width) (default = 0)
* if width < 0 : draw segments in sketch mode, width = abs(width)
* Use a value min(aSize.x, aSize.y) / 5 for a bold text
* @param aItalic = true to simulate an italic font
* @param aBold = true to use a bold font Useful only with default width value (aWidth = 0)
*/
void PLOTTER::Text( const wxPoint& aPos,
enum EDA_COLOR_T aColor,
const wxString& aText,
int aOrient,
const wxSize& aSize,
enum EDA_TEXT_HJUSTIFY_T aH_justify,
enum EDA_TEXT_VJUSTIFY_T aV_justify,
int aWidth,
bool aItalic,
bool aBold )
{
int textPensize = aWidth;
if( textPensize == 0 && aBold ) // Use default values if aWidth == 0
textPensize = GetPenSizeForBold( std::min( aSize.x, aSize.y ) );
if( textPensize >= 0 )
textPensize = Clamp_Text_PenSize( aWidth, aSize, aBold );
else
textPensize = -Clamp_Text_PenSize( -aWidth, aSize, aBold );
SetCurrentLineWidth( textPensize );
if( aColor >= 0 )
SetColor( aColor );
DrawGraphicText( NULL, NULL, aPos, aColor, aText,
aOrient, aSize,
aH_justify, aV_justify,
textPensize, aItalic,
aBold,
NULL,
this );
if( aWidth != textPensize )
SetCurrentLineWidth( aWidth );
}
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