examples/ConcentricCircles.qs

   1 /****************************************************************************
   2 **
   3 ** Copyright (C) 2008 Trolltech ASA. All rights reserved.
   4 **
   5 ** This file is part of the Qt Script Generator project on Trolltech Labs.
   6 **
   7 ** This file may be used under the terms of the GNU General Public
   8 ** License version 2.0 as published by the Free Software Foundation
   9 ** and appearing in the file LICENSE.GPL included in the packaging of
  10 ** this file.  Please review the following information to ensure GNU
  11 ** General Public Licensing requirements will be met:
  12 ** http://www.trolltech.com/products/qt/opensource.html
  13 **
  14 ** If you are unsure which license is appropriate for your use, please
  15 ** review the following information:
  16 ** http://www.trolltech.com/products/qt/licensing.html or contact the
  17 ** sales department at sales@trolltech.com.
  18 **
  19 ** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
  20 ** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
  21 **
  22 ****************************************************************************/
  23
  24 function tr(s) { return s; }
  25
  26
  27 function CircleWidget(parent)
  28 {
  29     QWidget.call(this, parent);
  30
  31     this.floatBased = false;
  32     this.antialiased = false;
  33     this.frameNo = 0;
  34
  35     this.setBackgroundRole(QPalette.Base);
  36     this.setSizePolicy(QSizePolicy.Expanding, QSizePolicy.Expanding);
  37 }
  38
  39 CircleWidget.prototype = new QWidget();
  40
  41 CircleWidget.prototype.setFloatBased = function(floatBased)
  42 {
  43     this.floatBased = floatBased;
  44     this.update();
  45 }
  46
  47 CircleWidget.prototype.setAntialiased = function(antialiased)
  48 {
  49     this.antialiased = antialiased;
  50     this.update();
  51 }
  52
  53 CircleWidget.prototype.getMinimumSizeHint = function()
  54 {
  55     return new QSize(50, 50);
  56 }
  57
  58 CircleWidget.prototype.getSizeHint = function()
  59 {
  60     return new QSize(180, 180);
  61 }
  62
  63 CircleWidget.prototype.nextAnimationFrame = function()
  64 {
  65     ++this.frameNo;
  66     this.update();
  67 }
  68
  69 CircleWidget.prototype.paintEvent = function(/* event */)
  70 {
  71     var painter = new QPainter();
  72     painter.begin(this);
  73     painter.setRenderHint(QPainter.Antialiasing, this.antialiased);
  74     painter.translate(this.width / 2, this.height / 2);
  75
  76     for (var diameter = 0; diameter < 256; diameter += 9) {
  77         var delta = Math.abs((this.frameNo % 128) - diameter / 2);
  78         var alpha = 255 - (delta * delta) / 4 - diameter;
  79         if (alpha > 0) {
  80             painter.setPen(new QPen(new QColor(0, diameter / 2, 127, alpha), 3));
  81
  82             if (this.floatBased) {
  83                 painter.drawEllipse(new QRectF(-diameter / 2.0, -diameter / 2.0,
  84                                                diameter, diameter));
  85             } else {
  86                 painter.drawEllipse(new QRect(-diameter / 2, -diameter / 2,
  87                                               diameter, diameter));
  88             }
  89         }
  90     }
  91
  92     painter.end();
  93 }
  94
  95
  96 function Window(parent)
  97 {
  98     QWidget.call(this, parent);
  99
 100     var aliasedLabel = this.createLabel(tr("Aliased"));
 101     var antialiasedLabel = this.createLabel(tr("Antialiased"));
 102     var intLabel = this.createLabel(tr("Int"));
 103     var floatLabel = this.createLabel(tr("Float"));
 104
 105     var layout = new QGridLayout();
 106     layout.addWidget(aliasedLabel, 0, 1);
 107     layout.addWidget(antialiasedLabel, 0, 2);
 108     layout.addWidget(intLabel, 1, 0);
 109     layout.addWidget(floatLabel, 2, 0);
 110
 111     var timer = new QTimer(this);
 112
 113     for (var i = 0; i < 2; ++i) {
 114         for (var j = 0; j < 2; ++j) {
 115             var cw = new CircleWidget();
 116             cw.setAntialiased(j != 0);
 117             cw.setFloatBased(i != 0);
 118
 119             timer.timeout.connect(
 120                     cw, cw.nextAnimationFrame);
 121
 122             layout.addWidget(cw, i + 1, j + 1);
 123         }
 124     }
 125     timer.start(100);
 126     this.setLayout(layout);
 127
 128     this.windowTitle = tr("Concentric Circles");
 129 }
 130
 131 Window.prototype = new QWidget();
 132
 133 Window.prototype.createLabel = function(text)
 134 {
 135     var label = new QLabel(text);
 136     label.alignment = Qt.AlignCenter;
 137     label.margin = 2;
 138     label.setFrameStyle(QFrame.Box | QFrame.Sunken);
 139     return label;
 140 }
 141
 142 var win = new Window();
 143 win.show();
 144 QCoreApplication.exec();