workspace/kcontrol/hardware/joystick/poswidget.cpp

   1 /***************************************************************************
   2  *   Copyright (C) 2003,2005,2006 by Martin Koller                         *
   3  *   m.koller@surfeu.at                                                    *
   4  *   This file is part of the KDE Control Center Module for Joysticks      *
   5  *                                                                         *
   6  *   This program is free software; you can redistribute it and/or modify  *
   7  *   it under the terms of the GNU General Public License as published by  *
   8  *   the Free Software Foundation; either version 2 of the License, or     *
   9  *   (at your option) any later version.                                   *
  10  *                                                                         *
  11  *   This program is distributed in the hope that it will be useful,      *
  12  *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
  13  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
  14  *   GNU General Public License for more details.                          *
  15  *                                                                         *
  16  *   You should have received a copy of the GNU General Public License     *
  17  *   along with this program; if not, write to the                         *
  18  *   Free Software Foundation, Inc.,                                      *
  19  *   51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.         *
  20  ***************************************************************************/
  21 #include "poswidget.h"
  22
  23 #include <QPainter>
  24
  25 #define XY_WIDTH 220
  26 #define MARK_WIDTH 10
  27 #define MAX_POINTS 500
  28
  29 //-----------------------------------------------------------------
  30
  31 PosWidget::PosWidget(QWidget *parent)
  32   : QWidget(parent), x(0), y(0), trace(false)
  33 {
  34   setMinimumSize(XY_WIDTH, XY_WIDTH);
  35   setMaximumSize(XY_WIDTH, XY_WIDTH);
  36
  37   QPalette palette;
  38   palette.setColor(backgroundRole(), Qt::white);
  39   setPalette(palette);
  40 }
  41
  42 //-----------------------------------------------------------------
  43
  44 void PosWidget::paintEvent(QPaintEvent *)
  45 {
  46   QPainter paint(this);
  47
  48   // draw a frame
  49   paint.drawRect(0, 0, width()-1, height()-1);
  50   paint.setPen(Qt::gray);
  51
  52   // draw a center grid
  53   paint.drawLine(XY_WIDTH/2, 1,
  54                  XY_WIDTH/2, XY_WIDTH - 2);
  55
  56   paint.drawLine(1,           XY_WIDTH/2,
  57                  XY_WIDTH - 2, XY_WIDTH/2);
  58
  59   // draw the trace of previous points
  60   if ( trace )
  61   {
  62     paint.setPen(Qt::black);
  63
  64     for (int i = 0; i < tracePoints.count()-2; i++)
  65       paint.drawLine(tracePoints[i], tracePoints[i+1]);
  66
  67     if ( tracePoints.count() > 0 )
  68       paint.drawLine(tracePoints[tracePoints.count()-1], QPoint(x, y));
  69   }
  70
  71   // draw the current position marker
  72   paint.setPen(Qt::blue);
  73
  74   paint.drawLine(x - MARK_WIDTH/2, y - MARK_WIDTH/2,
  75                  x + MARK_WIDTH/2, y + MARK_WIDTH/2);
  76
  77   paint.drawLine(x - MARK_WIDTH/2, y + MARK_WIDTH/2,
  78                  x + MARK_WIDTH/2, y - MARK_WIDTH/2);
  79 }
  80
  81 //-----------------------------------------------------------------
  82
  83 void PosWidget::changeX(int newX)
  84 {
  85   // transform coordinates from joystick to widget coordinates
  86   newX = int((newX/65535.0)*XY_WIDTH + XY_WIDTH/2);
  87
  88   if ( x == newX ) return;  // avoid unnecessary redraw
  89
  90   if ( trace )
  91   {
  92     tracePoints.append(QPoint(x, y));
  93     if ( tracePoints.count() == MAX_POINTS )
  94       tracePoints.removeFirst();
  95   }
  96
  97   x = newX;
  98   update();
  99 }
 100
 101 //-----------------------------------------------------------------
 102
 103 void PosWidget::changeY(int newY)
 104 {
 105   // transform coordinates from joystick to widget coordinates
 106   newY = int((newY/65535.0)*XY_WIDTH + XY_WIDTH/2);
 107
 108   if ( y == newY ) return;  // avoid unnecessary redraw
 109
 110   if ( trace )
 111   {
 112     tracePoints.append(QPoint(x, y));
 113     if ( tracePoints.count() == MAX_POINTS )
 114       tracePoints.removeFirst();
 115   }
 116
 117   y = newY;
 118   update();
 119 }
 120
 121 //-----------------------------------------------------------------
 122
 123 void PosWidget::showTrace(bool t)
 124 {
 125   trace = t;
 126   tracePoints.clear();
 127
 128   update();
 129 }
 130
 131 //-----------------------------------------------------------------
 132
 133 #include "poswidget.moc"