Quellcode-Bibliothek

^© Kompilation durch diese Firma

[Weder Korrektheit noch Funktionsfähigkeit der Software werden zugesichert.]

Datei: math_draw.C Sprache: C

Original von: Lyx^©

/*
*  File:        math_draw.C
*  Purpose:     Interaction and drawing for mathed
*  Author:      Alejandro Aguilar Sierra <[email protected]>
*  Created:     January 1996
*  Description: Math drawing and interaction for a WYSIWYG math editor.
*
*  Dependencies: Xlib, XForms
*
*  Copyright: (c) 1996, Alejandro Aguilar Sierra
*
*   Version: 0.8beta, Mathed & Lyx project.
*
*   You are free to use and modify this code under the terms of
*   the GNU General Public Licence version 2 or later.
*/

#include <config.h>
#include FORMS_H_LOCATION
#include "math_cursor.h"
#include "math_parser.h"

extern void mathed_set_font(short type, int style);
extern int mathed_char_width(short type, int style, byte c);
extern int mathed_string_width(short type, int style, byte const* s, int ls);
extern int mathed_string_height(short, int, byte const*, int, int&, int&);
extern int mathed_char_height(short, int, byte, int&, int&);

GC canvasGC=0, mathGC=0, mathLineGC=0, latexGC=0, cursorGC=0, mathFrameGC=0;

long unsigned int MathedInset::pm;

void
MathSpaceInset::Draw(int x, int y)
{

// XPoint p[4] = {{++x, y-3}, {x, y}, {x+width-2, y}, {x+width-2, y-3}};

// Sadly, HP-UX CC can't handle that kind of initialization.

   XPoint p[4];
   p[0].x = ++x; p[0].y = y-3;
   p[1].x = x;  p[1].y = y;
   p[2].x = x+width-2; p[2].y = y;
   p[3].x = x+width-2; p[3].y = y-3;

   XDrawLines(fl_display,pm,(space) ? latexGC: mathGC,p,4,CoordModeOrigin);
   XFlush(fl_display);
}

void
MathParInset::Draw(int x, int y)
{
   byte cx, cxp=0;
   int xp=0, ls;
   int asc=df_asc, des=0;
   bool limits = false;

   xo = x;  yo = y;
   if (!array || array->Empty()) {
      mathed_set_font(LM_TC_VAR, 1);
       if (array) {
    MathedXIter data(this);
    data.GetPos(x, y);
       }
      XDrawRectangle(fl_display,pm,mathLineGC,x,y-df_asc, df_width, df_asc);
      XFlush(fl_display);
      return;
   }
   MathedXIter data(this);
   data.GoBegin();
   while (data.OK()) {
      data.GetPos(x, y);
      cx = data.GetChar();
      if (cx >= ' ') {
  byte *s = data.GetString(ls);
   drawStr(data.FCode(), size, x, y, s, ls);
   mathed_char_height(data.FCode(), size, s[ls-1], asc, des);
   limits = false;
      } else {
   if (cx==0) break;
  if (MathIsInset(cx)) {
     int yy = y;
     MathedInset *p = data.GetInset();
     if (cx==LM_TC_UP) {
        if (limits) {
    x -= (xp>p->Width()) ? p->Width()+(xp-p->Width())/2: xp;
    yy -= (asc + p->Descent()+4);
        } else
    yy -= (p->Descent()>asc) ? p->Descent()+4: asc;
     } else
     if (cx==LM_TC_DOWN) {
        if (limits) {
    x -= (xp>p->Width()) ? p->Width()+(xp-p->Width())/2: xp;
    yy += des + p->Ascent() + 2;
        } else
   yy += des + p->Ascent()/2;
     } else {
        asc = p->Ascent();
        des = p->Descent();
     }
     p->Draw(x, yy);
     if (cx!=LM_TC_UP && cx!=LM_TC_DOWN) {
        limits = p->GetLimits();
        if (limits) xp = p->Width();
     }
     data.Next();
  } else
    if (cx==LM_TC_TAB) {
        if ((cxp==cx || cxp==LM_TC_CR || data.IsFirst())) { // && objtype==L
     XDrawRectangle(fl_display,pm,mathLineGC,
      x,y-df_asc, df_width, df_asc);
        }

       XFlush(fl_display);
       data.Next();
       limits = false;
    } else
     if (cx==LM_TC_CR) {
  if (cxp==LM_TC_TAB || cxp==LM_TC_CR || data.IsFirst()) { //  && objtype==LM_OT_MATRIX) {
    XDrawRectangle(fl_display,pm,mathLineGC,x,y-df_asc, df_width, df_asc);
  }
  data.Next();
  limits = false;
     }
  else {
     fprintf(stderr, "GMathed Error: Unrecognized code[%d]\n", cx);
     break;
  }
      }
      cxp = cx;
   }
   if (cxp==LM_TC_TAB || cxp==LM_TC_CR) { // && objtype==LM_OT_MATRIX) {
      data.GetPos(x, y);
      XDrawRectangle(fl_display,pm,mathLineGC,x,y-df_asc, df_width, df_asc);
      XFlush(fl_display);
   }
}

void
MathParInset::Metrics()
{
    byte cx, cxp=0, *s;
    int ls;
    int asc=df_asc, des=0;
    int tb = 0, tab=0;

    bool limits = false;

    ascent = df_asc;//mathed_char_height(LM_TC_VAR, size, 'I', asc, des);
    width = df_width;
    descent = 0;
    if (!array) return;
    if (array->Empty()) return;

    ascent = 0;
    MathedXIter data(this);
    data.GoBegin();
    while (data.OK()) {
cx = data.GetChar();
if (cx >= ' ') {
     s = data.GetString(ls);
     mathed_string_height(data.FCode(), size, s, ls, asc, des);
     if (asc > ascent) ascent = asc;
     if (des > descent) descent = des;
     limits = false;
} else
   if (MathIsInset(cx)) {
       MathedInset *p = data.GetInset();
       p->SetStyle(size);
       p->Metrics();
       if (cx==LM_TC_UP) {
    asc += (limits) ? p->Height()+4: p->Ascent() +
      ((p->Descent()>asc) ? p->Descent()-asc+4: 0);
       } else
  if (cx==LM_TC_DOWN) {
      des += ((limits) ? p->Height()+4: p->Height()-p->Ascent()/2);
  } else {
      asc = p->Ascent();
      des = p->Descent();
  }
       if (asc > ascent) ascent = asc;
       if (des > descent) descent = des;
       if (cx!=LM_TC_UP && cx!=LM_TC_DOWN)
  limits = p->GetLimits();
       data.Next();
   } else
   if (cx==LM_TC_TAB) {
       int x, y;
       data.GetIncPos(x, y);
       if (data.IsFirst() || cxp==LM_TC_TAB || cxp==LM_TC_CR) {
    if (ascent<df_asc) ascent = df_asc;
    tb = x;
       }
       data.setTab(x-tb, tab);
       tb = x;
       tab++;
       limits = false;
       data.Next();
   } else
   if (cx==LM_TC_CR) {
       if (tb>0) {
    int x, y;
    data.GetIncPos(x, y);
    if (data.IsFirst() || cxp==LM_TC_TAB || cxp==LM_TC_CR) {
        if (ascent<df_asc) ascent = df_asc;
        tb = x;
    }
    data.setTab(x-tb, tab);
       } else //if (GetColumns()==1)
      {
    int x, y;
    data.GetIncPos(x, y);
    data.setTab(x, tab);
    if (ascent<df_asc) ascent = df_asc;
       }
       tb=tab=0;
       data.subMetrics(ascent, descent);
       ascent = df_asc;
       descent = 0;
       data.Next();
   }
else {
     fprintf(stderr, "Mathed Error: Unrecognized code[%d]\n", cx);
     break;
}
cxp = cx;
    }
    data.GetIncPos(width, ls);

    // No matter how simple is a matrix, it is NOT a subparagraph
    if (isMatrix()) {
if (cxp==LM_TC_TAB) {
     if (ascent<df_asc) ascent = df_asc;
     data.setTab(0, tab);
} else {
   data.setTab(width-tb, tab);
}
    }

    data.subMetrics(ascent, descent);
}

void
MathSqrtInset::Draw(int x, int y)
{
   MathParInset::Draw(x+hmax+2, y);
   int h=ascent, d=descent, h2=Height()/2, w2 = (Height()>4*hmax)?hmax:hmax/2;
   XPoint p[4];
   p[0].x = x+width-1, p[0].y = y-h;
   p[1].x = x+hmax,    p[1].y = y-h;
   p[2].x = x+w2,      p[2].y = y+d;
   p[3].x = x,         p[3].y = y+d-h2;
   XDrawLines(fl_display, pm, mathLineGC,p, 4, CoordModeOrigin);
   XFlush(fl_display);
}

void
MathSqrtInset::Metrics()
{
   MathParInset::Metrics();
   ascent += 4;
   descent += 2;
   int a, b;
   hmax = mathed_char_height(LM_TC_VAR, size, 'I',a, b);
   if (hmax<10) hmax = 10;
   width += hmax + 4;
}

void
MathFracInset::Draw(int x, int y)
{
    short idxp = idx;
    short sizex = size;

    idx = 0;
    if (size==LM_ST_DISPLAY) size++;
    MathParInset::Draw(x+(width-w0)/2, y - des0);
    den->Draw(x+(width-w1)/2, y + den->Ascent() + 2 - dh);
    size = sizex;
    if (objtype==LM_OT_FRAC)
      XDrawLine(fl_display, pm, mathLineGC, x+2, y-dh, x+width-4, y - dh);
    XFlush(fl_display);
    idx = idxp;
}

void
MathFracInset::Metrics()
{
    if (!dh) {
int a, b;
dh = mathed_char_height(LM_TC_CONST, size, 'I', a, b)/2;
    }
    short idxp = idx;
    short sizex = size;
    idx = 0;
    if (size==LM_ST_DISPLAY) size++;
    MathParInset::Metrics();
    size = sizex;
    w0 = width;
    int as = Height() + 2 + dh;
    des0 = Descent() + 2 + dh;
    den->Metrics();
    w1 = den->Width();
    width = ((w0 > w1) ? w0: w1) + 12;
    ascent = as;
    descent = den->Height()+ 2 - dh;
    idx = idxp;
}

void
MathBigopInset::Draw(int x, int y)
{
   int ls;
   char c;
   char const *s;
   short t;

   if (sym<256 || sym==LM_oint) {
      ls = 1;
      c = (sym==LM_oint) ? LM_int: sym;
      s = &c;
      t = LM_TC_BSYM;
   } else {
      s = name;
      ls = strlen(name);
      t = LM_TC_TEXTRM;
   }
   mathed_set_font(t, size);
   if (sym==LM_oint) {
      XDrawArc(fl_display, pm, mathLineGC, x,y-5*width/4,width,width,0,23040);
      XFlush(fl_display);
      x++;
   }
   XDrawString(fl_display, pm, mathGC, x, y, s, ls);
   XFlush(fl_display);
}

void
MathBigopInset::Metrics()
{
   int ls;
   char c;
   char const *s;
   short t;

   if (sym<256 || sym==LM_oint) {
      ls = 1;
      c = (sym==LM_oint) ? LM_int: sym;
      s = &c;
      t = LM_TC_BSYM;
   } else {
      s = name;
      ls = strlen(name);
      t = LM_TC_TEXTRM;
   }
   mathed_set_font(t, size);
   mathed_string_height(t, size, (unsigned char const *)s, ls, ascent, descent);
   width = mathed_string_width(t, size, (unsigned char const *)s, ls);
   if (sym==LM_oint) width += 2;
}

¤ Dauer der Verarbeitung: 0.4 Sekunden (vorverarbeitet) ¤

Download des Quellennavigators
Download des sprechenden Kalenders
in der Quellcodebibliothek suchen

Haftungshinweis

Die Informationen auf dieser Webseite wurden nach bestem Wissen sorgfältig zusammengestellt. Es wird jedoch weder Vollständigkeit, noch Richtigkeit, noch Qualität der bereit gestellten Informationen zugesichert.

Bemerkung:

Die farbliche Syntaxdarstellung ist noch experimentell.