drawtxt.cpp 18.7 KB
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582
/**
 * 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>

#ifndef DEFAULT_SIZE_TEXT
#   define DEFAULT_SIZE_TEXT 50
#endif

#define EDA_DRAWBASE
#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;


/**
 * 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( ABS( aSize ) / scale );

    if( penSize > maxWidth )
        penSize = maxWidth;
    return penSize;
}


int Clamp_Text_PenSize( int aPenSize, wxSize aSize, bool aBold )
{
    int size = MIN( ABS( aSize.x ), 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 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] == '~' )
        {
            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];

        if( AsciiCode == '~' ) /* Skip the negation marks */
        {
            continue;
        }

        const char* ptcar = GetHersheyShapeDescription( AsciiCode );
        /* Get metrics */
        int         xsta = *ptcar++ - 'R';
        int         xsto = *ptcar++ - 'R';
        tally += KiROUND( aXSize * (xsto - xsta) * s_HerscheyScaleFactor );
    }

    /* Italic correction, 1/8em */
    if( aItalic )
    {
        tally += KiROUND( aXSize * 0.125 );
    }
    return tally;
}


/* Helper function for drawing character polygons */
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 );
}


/* Helper function for texts with over bar
 */
static int overbar_position( int size_v, int thickness )
{
    return KiROUND( ( (double) size_v * 26 * s_HerscheyScaleFactor ) + ( (double) thickness * 1.5 ) );
}


/**
 * 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       overbars;                     // Number of ~ seen
    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( 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 = 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( 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( aPanel->GetClipBox(), aDC,
                    current_char_pos.x, current_char_pos.y, end.x, end.y, aWidth, aColor );

        return;
    }

    if( aItalic )
    {
        overbar_italic_comp = overbar_position( size_v, aWidth ) / 8;
        if( italic_reverse )
        {
            overbar_italic_comp = -overbar_italic_comp;
        }
    }
    else
    {
        overbar_italic_comp = 0;
    };

    overbars = 0;
    ptr = 0;   /* ptr = text index */
    while( ptr < char_count )
    {
        if( aText[ptr + overbars] == '~' )
        {
            /* Found an overbar, adjust the pointers */
            overbars++;

            if( overbars % 2 )
            {
                /* Starting the overbar */
                overbar_pos    = current_char_pos;
                overbar_pos.x += overbar_italic_comp;
                overbar_pos.y -= overbar_position( 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 -= overbar_position( 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 -= overbar_position( 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( 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 );
}