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RGLed.cpp

// -*- c-basic-offset: 2 -*-

/*  This file is a modified version of kled.cpp, which is part of the
    KDE libraries.  The modifications (for "brute-force" antialiasing)
    were carried out by Chris Cannam, April 2004.
 
    Copyright (C) 1998 Jörg Habenicht (j.habenicht@europemail.com)
 
    This library is free software; you can redistribute it and/or
    modify it under the terms of the GNU Library General Public
    License as published by the Free Software Foundation; either
    version 2 of the License, or (at your option) any later version.
 
    This library 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
    Library General Public License for more details.
 
    You should have received a copy of the GNU Library General Public License
    along with this library; see the file COPYING.LIB.  If not, write to
    the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
    Boston, MA 02111-1307, USA.
*/

/*************************************************************************
 * $Id: rgled.cpp 6694 2005-07-17 11:42:36Z cannam $
 *
 * $Log$
 * Revision 1.2  2005/07/17 11:42:36  cannam
 * * fixes from stg branch:
 *   - fix failure to recolour led when switching track from audio to midi or vice versa
 *   - fix colour number / menu index confusion in spb colour menu
 *
 * Revision 1.1.10.1  2005/07/17 00:00:30  cannam
 *
 * * merge across from HEAD to 17/07/2005
 * * appearance fixes
 *
 * Revision 1.1  2004/04/05 09:54:05  cannam
 *
 * * antialiased LEDs
 *
 * Revision 1.24  2002/12/16 15:10:03  mkretz
 * don't use a gray background but rather take the color from the current
 * colorscheme
 *
 * Revision 1.23  2002/03/04 00:51:49  lunakl
 * Keep BC changes (the patch is almost 100KiB of boring stuff
 * ... anybody willing to review? ;) ).
 *
 * Revision 1.22  2002/02/27 23:15:45  pfeiffer
 * kapp--
 *
 * Revision 1.21  2002/01/22 10:23:55  hausmann
 * - minor API fix (don't return a const QColor object)
 *
 * Revision 1.20  2001/10/10 17:40:39  mueller
 * CVS_SILENT: fixincludes
 *
 * Revision 1.19  2001/08/08 14:35:12  hausmann
 * - removed empty KActionCollection::childEvent
 * - added sizeHint() and minimumSizeHint() methods to KLed, as advised by
 *   Rik in the comment in kled.h
 * - removed unused mousePressEvent, mouseMoveEvent and mouseReleaseEvent
 *   handlers from KPassDlg
 * - merged KToolBar::insertSeparator() and KToolBar::insertLineSeparator()
 *   with their overloaded variants
 *
 * Revision 1.18  2001/04/16 22:08:43  pfeiffer
 * don't assume that the first item of an enum is 0
 *
 * Revision 1.17  2000/09/12 19:15:53  pfeiffer
 * Stefan Hellwig in cooperation with Joerg Habenicht:
 * Draw nicer LEDs, especially sunken ones.
 *
 * Revision 1.16  2000/08/24 12:44:48  porten
 * "friend class" patches from Thomas Kunert <kunert@physik.tu-dresden.de>
 *
 * Revision 1.15  2000/08/17 16:44:44  reggie
 * Don't crash
 *
 * Revision 1.14  2000/06/03 01:04:42  gehrmab
 * * Made drawing routines available for overriding
 * * Added a parent/name constructor
 * * Propertyfication
 *
 * Revision 1.13  2000/05/08 19:38:49  sschiman
 * Calling setColor before setting up the private data is a bad idea ;-)
 *
 * Revision 1.12  2000/05/07 09:49:57  habenich
 * provided method to set the factor to dark the LED
 * precalculated the dark color, is just retrieved at paint events
 *
 * Revision 1.11  2000/04/09 16:08:33  habenich
 * fixed nasty bug #70 disappearing led
 * reenabled flat and raised led painting
 *
 * Revision 1.10  1999/12/25 17:12:18  mirko
 * Modified Look "round" to "raised", as the others are flat and
 * sunken. All enums start with uppercase letters now to fit the overall
 * KDE style.
 * Implemented raised rectangluar look.
 * --Mirko.
 *
 * Revision 1.9  1999/11/12 21:17:09  antlarr
 * Fixed some bugs.
 * Added the possibility to draw a sunk rectangle as the "old" KLedLamp did.
 *
 * Revision 1.9  1999/11/11 16:08:15  antlarr
 * Fixed some bugs.
 * Added the possibility to draw a sunk rectangle as the "old" KLedLamp did.
 *
 * Revision 1.8  1999/11/01 22:03:15  dmuell
 * fixing all kinds of compile warnings
 * (unused var, unused argument etc)
 *
 * Revision 1.7  1999/10/10 13:34:14  mirko
 * First merge with KLedLamp that shows a rectangular LED.
 * It does not yet work reliably.
 *
 * Revision 1.6  1999/03/01 23:34:49  kulow
 * CVS_SILENT ported to Qt 2.0
 *
 * Revision 1.5  1999/02/19 08:52:42  habenich
 * ID und LOG tags included
 *
 *
 *************************************************************************/

#define PAINT_BENCH
#undef PAINT_BENCH

#ifdef PAINT_BENCH
#include <qdatetime.h>
#include <stdio.h>
#endif


#include <qpainter.h>
#include <qimage.h>
#include <qcolor.h>
#include <kapplication.h>
#include <kpixmapeffect.h>
#include "kled.h"


class KLed::KLedPrivate
{
    friend class KLed;

    int dark_factor;
    QColor offcolor;
    QPixmap *off_map;
    QPixmap *on_map;
};



KLed::KLed(QWidget *parent, const char *name)
        : QWidget( parent, name),
        led_state(On),
        led_look(Raised),
        led_shape(Circular)
{
    QColor col(green);
    d = new KLed::KLedPrivate;
    d->dark_factor = 300;
    d->offcolor = col.dark(300);
    d->off_map = 0;
    d->on_map = 0;

    setColor(col);
}


KLed::KLed(const QColor& col, QWidget *parent, const char *name)
        : QWidget( parent, name),
        led_state(On),
        led_look(Raised),
        led_shape(Circular)
{
    d = new KLed::KLedPrivate;
    d->dark_factor = 300;
    d->offcolor = col.dark(300);
    d->off_map = 0;
    d->on_map = 0;

    setColor(col);
    //setShape(Circular);
}

KLed::KLed(const QColor& col, KLed::State state,
           KLed::Look look, KLed::Shape shape, QWidget *parent, const char *name )
        : QWidget(parent, name),
        led_state(state),
        led_look(look),
        led_shape(shape)
{
    d = new KLed::KLedPrivate;
    d->dark_factor = 300;
    d->offcolor = col.dark(300);
    d->off_map = 0;
    d->on_map = 0;

    //setShape(shape);
    setColor(col);
}


KLed::~KLed()
{
    delete d->off_map;
    delete d->on_map;
    delete d;
}

void
KLed::paintEvent(QPaintEvent *)
{
#ifdef PAINT_BENCH
    const int rounds = 1000;
    QTime t;
    t.start();
    for (int i = 0; i < rounds; i++) {
#endif
        switch (led_shape) {
        case Rectangular:
            switch (led_look) {
            case Sunken :
                paintRectFrame(false);
                break;
            case Raised :
                paintRectFrame(true);
                break;
            case Flat :
                paintRect();
                break;
            default :
                qWarning("%s: in class KLed: no KLed::Look set", qApp->argv()[0]);
            }
            break;
        case Circular:
            switch (led_look) {
            case Flat :
                paintFlat();
                break;
            case Raised :
                paintRound();
                break;
            case Sunken :
                paintSunken();
                break;
            default:
                qWarning("%s: in class KLed: no KLed::Look set", qApp->argv()[0]);
            }
            break;
        default:
            qWarning("%s: in class KLed: no KLed::Shape set", qApp->argv()[0]);
            break;
        }
#ifdef PAINT_BENCH

    }
    int ready = t.elapsed();
    qWarning("elapsed: %d msec. for %d rounds", ready, rounds);
#endif
}

void
KLed::paintFlat() // paint a ROUND FLAT led lamp
{
    QPainter paint;
    QColor color;
    QBrush brush;
    QPen pen;

    // Initialize coordinates, width, and height of the LED
    //
    int width = this->width();
    // Make sure the LED is round!
    if (width > this->height())
        width = this->height();
    width -= 2; // leave one pixel border
    if (width < 0)
        width = 0;


    // start painting widget
    //
    paint.begin( this );

    // Set the color of the LED according to given parameters
    color = ( led_state ) ? led_color : d->offcolor;

    // Set the brush to SolidPattern, this fills the entire area
    // of the ellipse which is drawn with a thin grey "border" (pen)
    brush.setStyle( QBrush::SolidPattern );
    brush.setColor( color );

    pen.setWidth( 1 );
    color = colorGroup().dark();
    pen.setColor( color );                // Set the pen accordingly

    paint.setPen( pen );                  // Select pen for drawing
    paint.setBrush( brush );        // Assign the brush to the painter

    // Draws a "flat" LED with the given color:
    paint.drawEllipse( 1, 1, width, width );

    paint.end();
    //
    // painting done
}

void
KLed::paintRound() // paint a ROUND RAISED led lamp
{
    QPainter paint;
    QColor color;
    QBrush brush;
    QPen pen;

    // Initialize coordinates, width, and height of the LED
    int width = this->width();

    // Make sure the LED is round!
    if (width > this->height())
        width = this->height();
    width -= 2; // leave one pixel border
    if (width < 0)
        width = 0;

    // start painting widget
    //
    paint.begin( this );

    // Set the color of the LED according to given parameters
    color = ( led_state ) ? led_color : d->offcolor;

    // Set the brush to SolidPattern, this fills the entire area
    // of the ellipse which is drawn first
    brush.setStyle( QBrush::SolidPattern );
    brush.setColor( color );
    paint.setBrush( brush );        // Assign the brush to the painter

    // Draws a "flat" LED with the given color:
    paint.drawEllipse( 1, 1, width, width );

    // Draw the bright light spot of the LED now, using modified "old"
    // painter routine taken from KDEUI´s KLed widget:

    // Setting the new width of the pen is essential to avoid "pixelized"
    // shadow like it can be observed with the old LED code
    pen.setWidth( 2 );

    // shrink the light on the LED to a size about 2/3 of the complete LED
    int pos = width / 5 + 1;
    int light_width = width;
    light_width *= 2;
    light_width /= 3;

    // Calculate the LED´s "light factor":
    int light_quote = (130 * 2 / (light_width ? light_width : 1)) + 100;

    // Now draw the bright spot on the LED:
    while (light_width)
    {
        color = color.light( light_quote );                 // make color lighter
        pen.setColor( color );                        // set color as pen color
        paint.setPen( pen );                    // select the pen for drawing
        paint.drawEllipse( pos, pos, light_width, light_width );  // draw the ellipse (circle)
        light_width--;
        if (!light_width)
            break;
        paint.drawEllipse( pos, pos, light_width, light_width );
        light_width--;
        if (!light_width)
            break;
        paint.drawEllipse( pos, pos, light_width, light_width );
        pos++;
        light_width--;
    }

    // Drawing of bright spot finished, now draw a thin grey border
    // around the LED; it looks nicer that way. We do this here to
    // avoid that the border can be erased by the bright spot of the LED

    pen.setWidth( 1 );
    color = colorGroup().dark();
    pen.setColor( color );                // Set the pen accordingly
    paint.setPen( pen );                  // Select pen for drawing
    brush.setStyle( QBrush::NoBrush );          // Switch off the brush
    paint.setBrush( brush );              // This avoids filling of the ellipse

    paint.drawEllipse( 1, 1, width, width );

    paint.end();
    //
    // painting done
}

void
KLed::paintSunken() // paint a ROUND SUNKEN led lamp
{
    QPainter paint;
    QColor color;
    QBrush brush;
    QPen pen;

    // First of all we want to know what area should be updated
    // Initialize coordinates, width, and height of the LED
    int     width = this->width();

    // Make sure the LED is round!
    if (width > this->height())
        width = this->height();
    width -= 2; // leave one pixel border
    if (width < 0)
        width = 0;

    // maybe we could stop HERE, if width <=0 ?

    int scale = 1;
    QPixmap *tmpMap = 0;
    bool smooth = true;

    if (smooth)
    {
        if (led_state) {
            if (d->on_map) {
                paint.begin(this);
                paint.drawPixmap(0, 0, *d->on_map);
                paint.end();
                return ;
            }
        } else {
            if (d->off_map) {
                paint.begin(this);
                paint.drawPixmap(0, 0, *d->off_map);
                paint.end();
                return ;
            }
        }

        scale = 3;
        width *= scale;

        tmpMap = new QPixmap(width, width);
        tmpMap->fill(paletteBackgroundColor());
        paint.begin(tmpMap);

    } else
    {
        paint.begin(this);
    }

    // Set the color of the LED according to given parameters
    color = ( led_state ) ? led_color : d->offcolor;

    // Set the brush to SolidPattern, this fills the entire area
    // of the ellipse which is drawn first
    brush.setStyle( QBrush::SolidPattern );
    brush.setColor( color );
    paint.setBrush( brush );                // Assign the brush to the painter

    // Draws a "flat" LED with the given color:
    paint.drawEllipse( scale, scale, width - scale*2, width - scale*2 );

    // Draw the bright light spot of the LED now, using modified "old"
    // painter routine taken from KDEUI´s KLed widget:

    // Setting the new width of the pen is essential to avoid "pixelized"
    // shadow like it can be observed with the old LED code
    pen.setWidth( 2 * scale );

    // shrink the light on the LED to a size about 2/3 of the complete LED
    int pos = width / 5 + 1;
    int light_width = width;
    light_width *= 2;
    light_width /= 3;

    // Calculate the LED´s "light factor":
    int light_quote = (130 * 2 / (light_width ? light_width : 1)) + 100;

    // Now draw the bright spot on the LED:
    while (light_width)
    {
        color = color.light( light_quote );                      // make color lighter
        pen.setColor( color );                                   // set color as pen color
        paint.setPen( pen );                                     // select the pen for drawing
        paint.drawEllipse( pos, pos, light_width, light_width ); // draw the ellipse (circle)
        light_width--;
        if (!light_width)
            break;
        paint.drawEllipse( pos, pos, light_width, light_width );
        light_width--;
        if (!light_width)
            break;
        paint.drawEllipse( pos, pos, light_width, light_width );
        pos++;
        light_width--;
    }

    // Drawing of bright spot finished, now draw a thin border
    // around the LED which resembles a shadow with light coming
    // from the upper left.

    pen.setWidth( 2 * scale + 1 ); // ### shouldn't this value be smaller for smaller LEDs?
    brush.setStyle( QBrush::NoBrush );              // Switch off the brush
    paint.setBrush( brush );                        // This avoids filling of the ellipse

    // Set the initial color value to colorGroup().light() (bright) and start
    // drawing the shadow border at 45° (45*16 = 720).

    int angle = -720;
    color = colorGroup().light();

    for ( int arc = 120; arc < 2880; arc += 240 )
    {
        pen.setColor( color );
        paint.setPen( pen );
        int w = width - pen.width() / 2 - scale + 1;
        paint.drawArc( pen.width() / 2, pen.width() / 2, w, w, angle + arc, 240 );
        paint.drawArc( pen.width() / 2, pen.width() / 2, w, w, angle - arc, 240 );
        color = color.dark( 110 ); //FIXME: this should somehow use the contrast value
    } // end for ( angle = 720; angle < 6480; angle += 160 )

    paint.end();
    //
    // painting done

    if (smooth)
    {
        QPixmap *&dest = led_state ? d->on_map : d->off_map;
        QImage i = tmpMap->convertToImage();
        width /= 3;
        i = i.smoothScale(width, width);
        delete tmpMap;
        dest = new QPixmap(i);
        paint.begin(this);
        paint.drawPixmap(0, 0, *dest);
        paint.end();
    }
}

void
KLed::paintRect()
{
    QPainter painter(this);
    QBrush lightBrush(led_color);
    QBrush darkBrush(d->offcolor);
    QPen pen(led_color.dark(300));
    int w = width();
    int h = height();
    // -----
    switch (led_state) {
    case On:
        painter.setBrush(lightBrush);
        painter.drawRect(0, 0, w, h);
        break;
    case Off:
        painter.setBrush(darkBrush);
        painter.drawRect(0, 0, w, h);
        painter.setPen(pen);
        painter.drawLine(0, 0, w, 0);
        painter.drawLine(0, h - 1, w, h - 1);
        // Draw verticals
        int i;
        for (i = 0; i < w; i += 4 /* dx */)
            painter.drawLine(i, 1, i, h - 1);
        break;
    default:
        break;
    }
}

void
KLed::paintRectFrame(bool raised)
{
    QPainter painter(this);
    QBrush lightBrush(led_color);
    QBrush darkBrush(d->offcolor);
    int w = width();
    int h = height();
    QColor black = Qt::black;
    QColor white = Qt::white;
    // -----
    if (raised) {
        painter.setPen(white);
        painter.drawLine(0, 0, 0, h - 1);
        painter.drawLine(1, 0, w - 1, 0);
        painter.setPen(black);
        painter.drawLine(1, h - 1, w - 1, h - 1);
        painter.drawLine(w - 1, 1, w - 1, h - 1);
        painter.fillRect(1, 1, w - 2, h - 2,
                         (led_state == On) ? lightBrush : darkBrush);
    } else {
        painter.setPen(black);
        painter.drawRect(0, 0, w, h);
        painter.drawRect(0, 0, w - 1, h - 1);
        painter.setPen(white);
        painter.drawRect(1, 1, w - 1, h - 1);
        painter.fillRect(2, 2, w - 4, h - 4,
                         (led_state == On) ? lightBrush : darkBrush);
    }
}

KLed::State
KLed::state() const
{
    return led_state;
}

KLed::Shape
KLed::shape() const
{
    return led_shape;
}

QColor
KLed::color() const
{
    return led_color;
}

KLed::Look
KLed::look() const
{
    return led_look;
}

void
KLed::setState( State state )
{
    if (led_state != state) {
        led_state = state;
        update();
    }
}

void
KLed::toggleState()
{
    led_state = (led_state == On) ? Off : On;
    // setColor(led_color);
    update();
}

void
KLed::setShape(KLed::Shape s)
{
    if (led_shape != s) {
        led_shape = s;
        update();
    }
}

void
KLed::setColor(const QColor& col)
{
    if (led_color != col) {
        led_color = col;
        d->offcolor = col.dark(d->dark_factor);
        delete d->on_map;
        d->on_map = 0;
        delete d->off_map;
        d->off_map = 0;
        update();
    }
}

void
KLed::setDarkFactor(int darkfactor)
{
    if (d->dark_factor != darkfactor) {
        d->dark_factor = darkfactor;
        d->offcolor = led_color.dark(darkfactor);
        update();
    }
}

int
KLed::darkFactor() const
{
    return d->dark_factor;
}

void
KLed::setLook( Look look )
{
    if (led_look != look) {
        led_look = look;
        update();
    }
}

void
KLed::toggle()
{
    toggleState();
}

void
KLed::on()
{
    setState(On);
}

void
KLed::off()
{
    setState(Off);
}

QSize
KLed::sizeHint() const
{
    return QSize(16, 16);
}

QSize
KLed::minimumSizeHint() const
{
    return QSize(16, 16 );
}

void KLed::virtual_hook( int, void* )
{ /*BASE::virtual_hook( id, data );*/
}

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