summaryrefslogtreecommitdiffstats
path: root/examples/scribble/scribble.cpp
blob: 04f9314214e524f03e6fac0d0ee91e016cde9da2 (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
/****************************************************************************
**
** Copyright (C) 1992-2008 Trolltech ASA.  All rights reserved.
**
** This file is part of an example program for TQt.  This example
** program may be used, distributed and modified without limitation.
**
*****************************************************************************/

#include "scribble.h"

#include <ntqapplication.h>
#include <tqevent.h>
#include <tqpainter.h>
#include <tqtoolbar.h>
#include <tqtoolbutton.h>
#include <tqspinbox.h>
#include <tqtooltip.h>
#include <tqrect.h>
#include <tqpoint.h>
#include <tqcolordialog.h>
#include <tqfiledialog.h>
#include <tqcursor.h>
#include <tqimage.h>
#include <tqstrlist.h>
#include <tqpopupmenu.h>
#include <tqintdict.h>

const bool no_writing = FALSE;

Canvas::Canvas( TQWidget *parent, const char *name )
    : TQWidget( parent, name, WStaticContents ), pen( TQt::red, 3 ), polyline(3),
      mousePressed( FALSE ), buffer( width(), height() )
{

    if ((tqApp->argc() > 0) && !buffer.load(tqApp->argv()[1]))
	buffer.fill( colorGroup().base() );
    setBackgroundMode( TQWidget::PaletteBase );
#ifndef TQT_NO_CURSOR
    setCursor( TQt::crossCursor );
#endif
}

void Canvas::save( const TQString &filename, const TQString &format )
{
    if ( !no_writing )
	buffer.save( filename, format.upper() );
}

void Canvas::clearScreen()
{
    buffer.fill( colorGroup().base() );
    repaint( FALSE );
}

void Canvas::mousePressEvent( TQMouseEvent *e )
{
    mousePressed = TRUE;
    polyline[2] = polyline[1] = polyline[0] = e->pos();
}

void Canvas::mouseReleaseEvent( TQMouseEvent * )
{
    mousePressed = FALSE;
}

void Canvas::mouseMoveEvent( TQMouseEvent *e )
{
    if ( mousePressed ) {
	TQPainter painter;
	painter.begin( &buffer );
	painter.setPen( pen );
	polyline[2] = polyline[1];
	polyline[1] = polyline[0];
	polyline[0] = e->pos();
	painter.drawPolyline( polyline );
	painter.end();

	TQRect r = polyline.boundingRect();
	r = r.normalize();
	r.setLeft( r.left() - penWidth() );
	r.setTop( r.top() - penWidth() );
	r.setRight( r.right() + penWidth() );
	r.setBottom( r.bottom() + penWidth() );

	bitBlt( this, r.x(), r.y(), &buffer, r.x(), r.y(), r.width(), r.height() );
    }
}

void Canvas::resizeEvent( TQResizeEvent *e )
{
    TQWidget::resizeEvent( e );

    int w = width() > buffer.width() ?
	    width() : buffer.width();
    int h = height() > buffer.height() ?
	    height() : buffer.height();

    TQPixmap tmp( buffer );
    buffer.resize( w, h );
    buffer.fill( colorGroup().base() );
    bitBlt( &buffer, 0, 0, &tmp, 0, 0, tmp.width(), tmp.height() );
}

void Canvas::paintEvent( TQPaintEvent *e )
{
    TQWidget::paintEvent( e );

    TQMemArray<TQRect> rects = e->region().rects();
    for ( uint i = 0; i < rects.count(); i++ ) {
	TQRect r = rects[(int)i];
	bitBlt( this, r.x(), r.y(), &buffer, r.x(), r.y(), r.width(), r.height() );
    }
}

//------------------------------------------------------

Scribble::Scribble( TQWidget *parent, const char *name )
    : TQMainWindow( parent, name )
{
    canvas = new Canvas( this );
    setCentralWidget( canvas );

    TQToolBar *tools = new TQToolBar( this );

    bSave = new TQToolButton( TQPixmap(), "Save", "Save as PNG image", this, TQ_SLOT( slotSave() ), tools );
    bSave->setText( "Save as..." );

    tools->addSeparator();

    bPColor = new TQToolButton( TQPixmap(), "Choose Pen Color", "Choose Pen Color", this, TQ_SLOT( slotColor() ), tools );
    bPColor->setText( "Choose Pen Color..." );

    tools->addSeparator();

    bPWidth = new TQSpinBox( 1, 20, 1, tools );
    TQToolTip::add( bPWidth, "Choose Pen Width" );
    connect( bPWidth, TQ_SIGNAL( valueChanged( int ) ), this, TQ_SLOT( slotWidth( int ) ) );
    bPWidth->setValue( 3 );

    tools->addSeparator();

    bClear = new TQToolButton( TQPixmap(), "Clear Screen", "Clear Screen", this, TQ_SLOT( slotClear() ), tools );
    bClear->setText( "Clear Screen" );
}

void Scribble::slotSave()
{
    TQPopupMenu *menu = new TQPopupMenu( 0 );
    TQIntDict<TQString> formats;
    formats.setAutoDelete( TRUE );

    for ( unsigned int i = 0; i < TQImageIO::outputFormats().count(); i++ ) {
	TQString str = TQString( TQImageIO::outputFormats().at( i ) );
	formats.insert( menu->insertItem( TQString( "%1..." ).arg( str ) ), new TQString( str ) );
    }

    menu->setMouseTracking( TRUE );
    int id = menu->exec( bSave->mapToGlobal( TQPoint( 0, bSave->height() + 1 ) ) );

    if ( id != -1 ) {
	TQString format = *formats[ id ];

	TQString filename = TQFileDialog::getSaveFileName( TQString::null, TQString( "*.%1" ).arg( format.lower() ), this );
	if ( !filename.isEmpty() )
	    canvas->save( filename, format );
    }

    delete menu;
}

void Scribble::slotColor()
{
    TQColor c = TQColorDialog::getColor( canvas->penColor(), this );
    if ( c.isValid() )
	canvas->setPenColor( c );
}

void Scribble::slotWidth( int w )
{
    canvas->setPenWidth( w );
}

void Scribble::slotClear()
{
    canvas->clearScreen();
}