summaryrefslogtreecommitdiffstats
path: root/ktouch/src/ktouchslideline.cpp
blob: d7eff3fd91ff047421b00328d2355884abc4ed3b (plain)
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
/***************************************************************************
 *   ktouchslideline.h                                                     *
 *   -----------------                                                     *
 *   Copyright (C) 2000 by Håvard Frøiland, 2006 by Andreas Nicolai        *
 *   ghorwin@users.sourceforge.net                                         *
 *                                                                         *
 *   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.                                   *
 ***************************************************************************/

#include "ktouchslideline.h"
#include "ktouchslideline.moc"

#include <tqpainter.h>
#include <tqpixmap.h>
#include <kdebug.h>

#include <cmath>
#include <algorithm>

#include "prefs.h"
#include "ktouchcolorscheme.h"

// uncomment the following define to enable extended debugging
//#define SLIDE_LINE_DEBUGGING


// --- don't touch the lines below ---
#ifdef SLIDE_LINE_DEBUGGING

#define DRAW_TEACHER_CURSOR
#define KD_DEBUG(x)  kdDebug() << x 

#else // SLIDE_LINE_DEBUGGING

#define KD_DEBUG(x) ;

#endif // SLIDE_LINE_DEBUGGING
// --- don't touch the lines above ---


KTouchSlideLine::KTouchSlideLine(TQWidget *parent)
  : TQWidget( parent ),
    m_teacherPixmap(NULL),
    m_studentPixmap(NULL),
    m_slideTimer(this),
    m_cursorVisible(false),
    m_cursorTimer(this)
{
    // set widget defaults (note: teacher and student text is empty after creation)
    setMinimumHeight(50);
    setMaximumHeight(150);
    // NOTE : the maximum widget height is adjusted again in applyPreferences()

    setCursorTimerEnabled(true);

	m_marginCursor = 0;
 	m_cursorRangeLen = 0;
	m_slideLineHeight = 0;

	m_xCharWidth = 0;
	m_spaceCharWidth = 0;
	m_cursorHeight = 0;

	m_teacherTextLen = 0;
	m_correctTextLen = 0;
	m_studentTextLen = 0;
	m_xCursorTeacher = 0;
	m_xCursorStudent = 0;
	m_yCursorStudent = 0;

	// the x frame coordinates initially to zero
	m_xFrameTeacher = 0; 
	m_xFrameTeacherCurrent = 0;
    m_xFrameStudent = 0;  
    m_xFrameStudentCurrent = 0;

    connect( &m_cursorTimer, TQT_SIGNAL(timeout()), this, TQT_SLOT(toggleCursor()) );
    connect( &m_slideTimer, TQT_SIGNAL(timeout()), this, TQT_SLOT(slide()) );
}
// ----------------------------------------------------------------------------

KTouchSlideLine::~KTouchSlideLine() {
    delete m_teacherPixmap;
    delete m_studentPixmap;
}
// ----------------------------------------------------------------------------

void KTouchSlideLine::applyPreferences() {
	KD_DEBUG( "[KTouchSlideLine::applyPreferences]" << endl );

	// set maximum widget height (also determines maximum font size)
    setMaximumHeight(Prefs::maxSlidingWidgetHeight());

	// set font face of we override the lecture font
	if (Prefs::overrideLectureFont())
    	setFont(Prefs::font());
	else
		updateSlidingLines();
		
	// Note: The function setFont() in turn calls resizeFont() and through that
	//       the whole widget gets updated.
}
// ----------------------------------------------------------------------------

void KTouchSlideLine::setNewText(const TQString& teacher_text, const TQString& student_text) {
	KD_DEBUG( "[KTouchSlideLine::setNewText]" << endl );

    m_teacherText=teacher_text;
    m_studentText=student_text;
	KD_DEBUG( "  m_teacherText   = '" << m_teacherText << "'" << endl );
	KD_DEBUG( "  m_studentText   = '" << m_studentText << "'" << endl );

    updateSlidingLines();
}
// ----------------------------------------------------------------------------

void KTouchSlideLine::setStudentText(const TQString& text) {
	KD_DEBUG( "[KTouchSlideLine::setStudentText]" << endl );
    m_studentText=text;
    updateStudentLine();
}
// ----------------------------------------------------------------------------

void KTouchSlideLine::setFont(const TQFont& font) {
	KD_DEBUG( "[KTouchSlideLine::setFont]" << endl );
	// set the font for the slide line, unless the configuration overrides it
	if (Prefs::overrideLectureFont())		m_font = Prefs::font();
	else									m_font = font;

	// set point size of the font
	resizeFont();
	// Note: this function also takes care of updating the lines
}
// ----------------------------------------------------------------------------

bool KTouchSlideLine::canAddCharacter(const TQString& new_student_text) {
    TQFontMetrics fontMetrics( m_font );
	int new_text_len = textLen(fontMetrics, new_student_text);
	int allowed_student_length = m_studentPixmap->width() - 2*m_marginCursor;
	return (new_text_len <= allowed_student_length);
}
// ----------------------------------------------------------------------------


// *** Public slots ***

void KTouchSlideLine::setCursorTimerEnabled(bool on) {
    if (on)     m_cursorTimer.start(600);
    else        m_cursorTimer.stop();
    m_cursorVisible=false;
    drawCursor();
}
// ----------------------------------------------------------------------------


// *** Private slots ***

void KTouchSlideLine::toggleCursor() {
    m_cursorVisible=!m_cursorVisible;
    drawCursor();
}
// ----------------------------------------------------------------------------

void KTouchSlideLine::slide() {
	KD_DEBUG( "[KTouchSlideLine::slide]" << endl );
    if (m_studentPixmap==NULL || m_teacherPixmap==NULL) return;
    // calculate new x positions depending on slide speed
    double speed = 1.0 + 0.2*Prefs::slidingSpeed();

	KD_DEBUG( "  speed = " << speed << endl );

	// Teacher's line
	double dx_teacher = m_xFrameTeacher - m_xFrameTeacherCurrent;
    if (fabs(dx_teacher) < 1.0)	{	// if we are already close enough, don't slide anylonger
		m_xFrameTeacherCurrent = m_xFrameTeacher;
		dx_teacher = 0;
	}
	else {
    	double dx_teacher_new = dx_teacher/speed;
		m_xFrameTeacherCurrent += dx_teacher_new;
	}
    int int_xFrameTeacherCurrent = static_cast<int>(ceil(m_xFrameTeacherCurrent));
    KD_DEBUG( "  m_xFrameTeacher = " << m_xFrameTeacher << " current = "
            << int_xFrameTeacherCurrent << " (" << m_xFrameTeacherCurrent << ")" << endl );
    if (!Prefs::right2LeftTyping()) {
     	bitBlt(this, m_marginHorWidget, m_marginVerWidget,
           	m_teacherPixmap, int_xFrameTeacherCurrent, 0, m_slideLineWidth, m_slideLineHeight);
	}
	else {
	}

	// Student's line
	double dx_student = m_xFrameStudent - m_xFrameStudentCurrent;
    if (fabs(dx_student) < 1.0) {	// if we are already close enough, don't slide anylonger
		m_xFrameStudentCurrent = m_xFrameStudent;
		dx_student = 0;
	}
	else {
    	double dx_student_new = dx_student/speed;
		m_xFrameStudentCurrent += dx_student_new;
	}
    // NOTE : use ceil() to always round up the value, otherwise we get a funny "jumping"
    //        curser effect
    int int_xFrameStudentCurrent = static_cast<int>(ceil(m_xFrameStudentCurrent));
    KD_DEBUG( "  m_xFrameStudent = " << m_xFrameStudent << " current = "
            << int_xFrameStudentCurrent << " (" << m_xFrameStudentCurrent << ")" << endl );
    if (!Prefs::right2LeftTyping()) {
     	bitBlt(this, m_marginHorWidget, m_marginVerWidget + m_slideLineHeight + m_slideLineDist,
           	m_studentPixmap, int_xFrameStudentCurrent, 0, m_slideLineWidth, m_slideLineHeight);
	}
	else {
	}

    // restart slide timer if necessary
    if (dx_teacher != 0 || dx_student != 0)
        m_slideTimer.start(100, true);  // start singleshot timer to slide again
    drawCursor();
}
// ----------------------------------------------------------------------------


// *** Protected member functions (event implementation) ***

void KTouchSlideLine::paintEvent(TQPaintEvent*) {
    KD_DEBUG( "[KTouchSlideLine::paintEvent]" << endl );
    if (m_studentPixmap==NULL || m_teacherPixmap==NULL)
        updateSlidingLines();
    else
        slide();
}
// ----------------------------------------------------------------------------

void KTouchSlideLine::resizeEvent ( TQResizeEvent * ) {
    KD_DEBUG( "[KTouchSlideLine::resizeEvent]" << endl );
	// required input member variables:  none

	// when the widget is resized, the whole geometry is invalidated, so we do:
	//   1. recalculate and store the geometry of the sliding lines
	//   2. resize the font
	//   3. recreate the sliding lines (this is done from the resizeFont() function

	// TODO : make these values depending on widget size
	m_marginVerWidget = 10; 
	m_slideLineDist =  5;
	m_marginCursor = 20;
	m_slideLineHeight = (height() - 2*m_marginVerWidget - m_slideLineDist)/2;

	KD_DEBUG( "  m_slideLineDist    = " << m_slideLineDist  << endl );
	KD_DEBUG( "  m_slideLineHeight  = " << m_slideLineHeight  << endl );
	KD_DEBUG( "  m_marginCursor     = " << m_marginCursor  << endl );

	// now resize the font
	resizeFont();
}
// ----------------------------------------------------------------------------



// *** Private member functions (event implementation)

int KTouchSlideLine::textLen(const TQFontMetrics& fontMetrics, const TQString& text) {
	//KD_DEBUG( "[KTouchSlideLine::textLen]" << endl;

	// required input member variables:  m_xCharWidth

	// add an x to the string and subtract the width of the single x afterwards,
	// so that in case of "blablabla   " still the correct size is returned
    int w;
	if (!Prefs::right2LeftTyping())
		w = fontMetrics.boundingRect(text + "x").width() - m_xCharWidth;
	else
		w = fontMetrics.boundingRect("x" + text).width() - m_xCharWidth;
    return w;
}
// ----------------------------------------------------------------------------

void KTouchSlideLine::resizeFont() {
	KD_DEBUG( "[KTouchSlideLine::resizeFont]" << endl );
	if (m_slideLineHeight == 0)  return; // can happen during startup

	// required input member variables:  m_slideLineHeight

	// TODO : add support for fixed/overridden font size

    // this formula sets the font height to 65% of the line height
    m_font.setPointSize(static_cast<int>(m_slideLineHeight*0.65));
	// set the cursor height
	m_cursorHeight = static_cast<int>(m_slideLineHeight*0.65);
	KD_DEBUG( "  m_cursorHeight   = " << m_cursorHeight  << endl );
	// calculate the margin between the top of the student line and the top of the cursor.
	int y_line_margin = (m_slideLineHeight - m_cursorHeight)/2;
	// set the y coordinate of the cursor
	m_yCursorStudent = height() - m_marginVerWidget - m_slideLineHeight + y_line_margin;
	KD_DEBUG( "  m_yCursorStudent = " << m_yCursorStudent  << endl );
	// get font infos
    TQFontMetrics fontMetrics( m_font );
	// width of a single x character
	m_xCharWidth = fontMetrics.boundingRect("x").width();
	// width of a single space character
    m_spaceCharWidth = fontMetrics.boundingRect("x  x").width() - fontMetrics.boundingRect("x x").width();
	// update slide lines
	updateSlidingLines();
}
// ----------------------------------------------------------------------------

void KTouchSlideLine::drawCursor() {
	// required input member variables:  m_xCursorStudent, m_yCursorStudent, m_cursorHeight
	//									 m_xCursorTeacher
	//									 m_marginHorWidget, m_slideLineDist, m_slideLineHeight
	//									 m_xFrameTeacher, m_xFrameTeacherCurrent,
	//									 m_xFrameStudent, m_xFrameStudentCurrent,

    TQPainter p(this);

#ifdef DRAW_TEACHER_CURSOR
	TQColor col_tt = Prefs::commonTypingLineColors() ?
			     Prefs::teacherTextColor() :
				 KTouchColorScheme::m_colorSchemes[Prefs::currentColorScheme()].m_teacherTextColor;
	TQColor col_tb = Prefs::commonTypingLineColors() ?
			     Prefs::teacherBackgroundColor() :
				 KTouchColorScheme::m_colorSchemes[Prefs::currentColorScheme()].m_teacherBackground;

    if (m_cursorVisible)    p.setPen( col_tt );
    else                    p.setPen( col_tb );

	int dx_teacher = static_cast<int>(m_xFrameTeacher - m_xFrameTeacherCurrent);
	int cursor_x_teacher = m_marginHorWidget + m_xCursorTeacher + dx_teacher;

	// don't draw cursor if outside frame
	if (cursor_x_teacher > m_marginHorWidget && cursor_x_teacher < width() - m_marginHorWidget) {
    	p.drawLine(cursor_x_teacher, m_yCursorStudent - m_slideLineDist - m_slideLineHeight,
				   cursor_x_teacher, m_yCursorStudent + m_cursorHeight - m_slideLineDist - m_slideLineHeight);
	}
#endif


    if (m_cursorVisible)    p.setPen( m_cursorColor );
    else                    p.setPen( m_cursorBackground );

	int dx_student = static_cast<int>(m_xFrameStudent - m_xFrameStudentCurrent);
	int cursor_x_student = m_marginHorWidget + m_xCursorStudent + dx_student;

	// don't draw cursor if outside frame
	if (cursor_x_student > m_marginHorWidget && cursor_x_student < width() - m_marginHorWidget) {
//        KD_DEBUG( "  cursor_x_student    = " << cursor_x_student  << endl );
    	p.drawLine(cursor_x_student, m_yCursorStudent,
				   cursor_x_student, m_yCursorStudent + m_cursorHeight);
	}
}
// ----------------------------------------------------------------------------

void KTouchSlideLine::drawEnterChar(TQPainter *painter, int cursorPos, int y, int enterWidth) {
	// required input member variables:  none

    int gap = std::min(2,static_cast<int>(0.2*enterWidth));
    int enterHeight = static_cast<int>(0.4*enterWidth);
    int arrowSize = static_cast<int>(enterWidth/4.0);     // mind the difference between 4 and 4.0
    painter->drawLine(cursorPos+enterWidth, y, cursorPos+enterWidth, y-enterHeight);    // vertical line
    painter->drawLine(cursorPos+gap, y, cursorPos+enterWidth, y);                       // arrow
    painter->drawLine(cursorPos+gap, y, cursorPos+gap+arrowSize, y+arrowSize);          // arrow
    painter->drawLine(cursorPos+gap, y, cursorPos+gap+arrowSize, y-arrowSize);          // arrow
}
// ----------------------------------------------------------------------------

void KTouchSlideLine::updateSlidingLines() {
	KD_DEBUG( "[KTouchSlideLine::updateSlidingLines]" << endl );

	// required input member variables:  m_teacherText, m_studentText, m_marginCursor, m_cursorRangeLen
	//									 m_slideLineHeight, m_xCharWidth

	// check that input variables are ok, some of this stuff can happen during startup,
	// but we MUST NOT allow these variables here
    if (m_teacherText.isEmpty()) 	return;  
    if (m_slideLineHeight == 0) 	return;

	// first update some variables
    TQFontMetrics fontMetrics( m_font );
	m_teacherTextLen = textLen(fontMetrics, m_teacherText);
	KD_DEBUG( "  m_teacherTextLen = " << m_teacherTextLen  << endl );

	// assume long text first and calculate variables for maximum slide line size
	m_marginHorWidget = 30; // TODO : make dependent of widget width
	m_slideLineWidth = width() - 2*m_marginHorWidget;
	m_cursorRangeLen = m_slideLineWidth - 2*m_marginCursor;

	// adjust m_marginCursor and m_cursorRangeLen if text is smaller then available widget width
	if (m_teacherTextLen < m_cursorRangeLen) {
		KD_DEBUG( "  --> short text, correcting variables" << endl );
		m_cursorRangeLen = m_teacherTextLen;
		m_slideLineWidth = m_cursorRangeLen + 2*m_marginCursor;
		m_marginHorWidget = (width() - m_slideLineWidth)/2;
	}
	KD_DEBUG( "  m_cursorRangeLen   = " << m_cursorRangeLen  << endl );
	KD_DEBUG( "  m_slideLineWidth   = " << m_slideLineWidth  << endl );
	KD_DEBUG( "  m_marginHorWidget  = " << m_marginHorWidget << endl );

    // delete old pixmaps because we have to change their sizes anyway
    delete m_teacherPixmap;
	m_teacherPixmap = NULL; // just a precaution
    delete m_studentPixmap;
	m_studentPixmap = NULL; // just a precaution

	// create the teacher pixmap
	int w = 2*m_marginCursor + m_teacherTextLen; // TODO : add size of enter character
	int h = m_slideLineHeight;
    m_teacherPixmap = new TQPixmap(w,h);
	KD_DEBUG( "  m_teacherPixmap  = " << w << " x " << h << endl );

	// draw the teacher pixmap text
    TQPainter painter;
    painter.begin (TQT_TQPAINTDEVICE(m_teacherPixmap), this);
    painter.setFont( m_font );

	TQColor col_tt = Prefs::commonTypingLineColors() ?
			     Prefs::teacherTextColor() :
				 KTouchColorScheme::m_colorSchemes[Prefs::currentColorScheme()].m_teacherTextColor;
	TQColor col_tb = Prefs::commonTypingLineColors() ?
			     Prefs::teacherBackgroundColor() :
				 KTouchColorScheme::m_colorSchemes[Prefs::currentColorScheme()].m_teacherBackground;

    painter.fillRect( m_teacherPixmap->rect(), TQBrush(col_tb) );
    painter.setPen( col_tt );
    // create a rectangle for the text drawing
    TQRect textRect(m_marginCursor, 0, w-2*m_marginCursor, h);
	// left aligned
    if (!Prefs::right2LeftTyping()) {
     	painter.drawText(textRect, TQPainter::AlignLeft | TQPainter::AlignVCenter, m_teacherText);
    	// TODO : draw enter char after the text
    }
	// right aligned, e.g. for Hebrew text
    else {
		painter.drawText(textRect, TQPainter::AlignRight | TQPainter::AlignVCenter, m_teacherText);
		// TODO : draw enter character at left of text
    }
    painter.end();
	// done with the teachers text which will not change so quickly again

	// create student line pixmap thats slightly longer than the teacher's pixmap
    m_studentPixmap = new TQPixmap(w+100,h);
	KD_DEBUG( "  m_studentPixmap  = " << w+100 << " x " << h << endl );

	// update (draw) student line and calculate coordinates needed for sliding
	repaint(true); // trigger a paint event to erase the background
	updateStudentLine();
}
// ----------------------------------------------------------------------------

void KTouchSlideLine::updateStudentLine() {
	KD_DEBUG( "[KTouchSlideLine::updateStudentLine]" << endl );
	if (m_teacherPixmap == NULL || m_studentPixmap == NULL)  return;

	// required input member variables:  m_teacherText, m_studentText, m_marginCursor, m_cursorRangeLen
	//									 m_slideLineHeight, m_xCharWidth, m_teacherTextLen

	if (m_teacherTextLen == 0)  return;

    TQFontMetrics fontMetrics( m_font );
	m_studentTextLen = textLen(fontMetrics, m_studentText);
	KD_DEBUG( "  m_studentTextLen = " << m_studentTextLen << endl );

	// we now need to find out, how much of the students text was typed correctly
    int teacherLen = m_teacherText.length();
    int studentLen = m_studentText.length();

	unsigned int min_len = TQMIN(teacherLen, studentLen);

	TQString correctText;
	if (!Prefs::right2LeftTyping()) {
		// for text typed from left to right
		for (unsigned int i=0; i<min_len; ++i) {
			if (m_teacherText[i] == m_studentText[i])	correctText += m_teacherText[i];
			else break;
		}
	}
	else {
		// for text typed from right to left
		for (unsigned int i=min_len; i>0; --i) {
			if (m_teacherText[i-1] == m_studentText[i-1])	correctText = m_teacherText[i] + correctText;
			else break;
		}
	}

    bool error = (correctText.length() != min_len);
	KD_DEBUG( "  error in text?   = " << error << endl );
	KD_DEBUG( "  correctText      = '" << correctText << "'" << endl );
	m_correctTextLen = textLen(fontMetrics, correctText);
	KD_DEBUG( "  m_correctTextLen = " << m_correctTextLen << endl );

	// *** Teacher slide line ***

	// adjust some of the coordinates
    // NOTE: use ceil to get consistent rounding
	m_xCursorTeacher = static_cast<int>(m_marginCursor + ceil(double(m_correctTextLen)/m_teacherTextLen * m_cursorRangeLen));
	KD_DEBUG( "  m_xCursorTeacher = " << m_xCursorTeacher << endl );

	// TODO : transform coordinates when Prefs::right2LeftTyping() is true

	// find the coordinates of the current position in the Teacher's pixmap
	m_xCursorTPixmap = m_marginCursor + m_correctTextLen;
	KD_DEBUG( "  m_xCursorTPixmap = " << m_xCursorTPixmap << endl );

	// find the left x coordinates of the frame to be copied from the teacher pixmap, but first store the shift.
	m_xFrameTeacher = m_xCursorTPixmap - m_xCursorTeacher;
	KD_DEBUG( "  m_xFrameTeacher  = " << m_xFrameTeacher << endl );


	// *** Student slide line ***

	// make sure our student text length is < then allowed length
	int allowed_student_length = m_studentPixmap->width() - 2*m_marginCursor;
	if (m_studentTextLen > allowed_student_length) {
		KD_DEBUG( "  WARNING : m_studentTextLen ("<< m_studentTextLen <<") > allowed_student_length ("<< allowed_student_length <<")" << endl );
		m_studentTextLen = allowed_student_length;
	}

	// adjust some of the coordinates
	if (m_studentTextLen > m_teacherTextLen)
		m_xCursorStudent = m_marginCursor + m_cursorRangeLen;
	else
		m_xCursorStudent = static_cast<int>(m_marginCursor + ceil(double(m_studentTextLen)/m_teacherTextLen * m_cursorRangeLen));
	KD_DEBUG( "  m_xCursorStudent = " << m_xCursorStudent << endl );

	// find the coordinates of the current position in the Students's pixmap
	m_xCursorSPixmap = m_marginCursor + m_studentTextLen;

	// find the left x coordinates of the frame to be copied from the teacher pixmap, but first store the shift.
	m_xFrameStudent = m_xCursorSPixmap - m_xCursorStudent;
	KD_DEBUG( "  m_xFrameTeacher  = " << m_xFrameStudent << endl );

    // now let's draw the students pixmap
    TQPainter painter;
    painter.begin (TQT_TQPAINTDEVICE(m_studentPixmap), this);
    if (Prefs::colorOnError()) {
        // draw the student line depending on the colour settings
        if (error) {
			// determine colors depending on preferences settings
			m_cursorBackground = Prefs::commonTypingLineColors() 	? 	Prefs::errorBackgroundColor() :
				 KTouchColorScheme::m_colorSchemes[Prefs::currentColorScheme()].m_errorBackground;
			m_cursorColor = Prefs::commonTypingLineColors() 		?	Prefs::errorTextColor() :
				 KTouchColorScheme::m_colorSchemes[Prefs::currentColorScheme()].m_errorTextColor;
        }
        else {
			// determine colors depending on preferences settings
			m_cursorBackground = Prefs::commonTypingLineColors() 	? 	Prefs::studentBackgroundColor() :
				 KTouchColorScheme::m_colorSchemes[Prefs::currentColorScheme()].m_studentBackground;
			m_cursorColor = Prefs::commonTypingLineColors() 		? 	Prefs::studentTextColor() :
				 KTouchColorScheme::m_colorSchemes[Prefs::currentColorScheme()].m_studentTextColor;
        }
		painter.fillRect (m_studentPixmap->rect(), TQBrush(m_cursorBackground));
		painter.setPen( m_cursorColor );
    }
    else {
        // use always student text colors
        m_cursorColor = Prefs::studentTextColor();
        painter.setPen( m_cursorColor );
        m_cursorBackground = Prefs::studentBackgroundColor();
        painter.fillRect( m_studentPixmap->rect(), TQBrush(m_cursorBackground) );
    }
    // draw the text
    painter.setFont( m_font );
    TQRect textRect(m_marginCursor, 0, m_studentPixmap->width()-2*m_marginCursor, m_studentPixmap->height());
    if (Prefs::right2LeftTyping())
       painter.drawText(textRect, TQPainter::AlignRight | TQPainter::AlignVCenter, m_studentText);
    else 
       painter.drawText(textRect, TQPainter::AlignLeft | TQPainter::AlignVCenter, m_studentText);
    painter.end();
	// done painting the students line

	// turn on cursor blinking	
    m_cursorVisible = true;
    m_cursorTimer.start(800);

    slide(); // start the sliding 
}