Add a QtScript-based bar chart example.

1 files changed, 138 insertions, 0 deletions

diff --git a/barchart/barchart.qs b/barchart/barchart.qs
new file mode 100644
index 0000000..e92dc3c
--- /dev/null
+++ b/barchart/barchart.qs
@@ -0,0 +1,138 @@
+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** Contact: Qt Software Information (qt-info@nokia.com)
+**
+** This file is part of the Graphics Dojo project on Qt Labs.
+**
+** This file may be used under the terms of the GNU General Public
+** License version 2.0 or 3.0 as published by the Free Software Foundation
+** and appearing in the file LICENSE.GPL included in the packaging of
+** this file.  Please review the following information to ensure GNU
+** General Public Licensing requirements will be met:
+** http://www.fsf.org/licensing/licenses/info/GPLv2.html and
+** http://www.gnu.org/copyleft/gpl.html.
+**
+** If you are unsure which license is appropriate for your use, please
+** contact the sales department at qt-sales@nokia.com.
+**
+** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
+** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
+**
+****************************************************************************/
+
+BarChart.prototype = new QWidget;
+
+BarChart.prototype.suffix = "";
+
+function BarChart(parent) {
+    QWidget.call(this, parent);
+}
+
+// find the maximum value and widest (pixel-wise) label and suffix
+BarChart.prototype.showEvent = function(event) {
+    var fm = new QFontMetrics(this);
+
+    this.margin = 20;
+    this.titleHeight = fm.height();
+    this.barHeight = 1.5 * fm.height();
+    this.barSpacing = 0.6 * fm.height();
+
+    this.maxValue = this.suffixWidth = this.labelWidth = 0;
+    var count = 0;
+    for (d in this.data) {
+        this.labelWidth = Math.max(this.labelWidth, fm.width(d));
+        this.maxValue = Math.max(this.maxValue, this.data[d]);
+        this.suffixWidth = Math.max(this.suffixWidth, fm.width(String(this.data[d]) + " " + this.suffix));
+        count++;
+    }
+
+    this.startHue = 15;
+    this.hueDelta = 360 / count;
+
+    this.size = new QSize(640, this.titleHeight + 2 * this.margin + (this.barHeight + this.barSpacing) * count);
+}
+
+BarChart.prototype.paintEvent = function(event) {
+
+
+    var p = new QPainter;
+    p.begin(this);
+
+    // background and title
+    p.fillRect(this.rect, new QBrush(new QColor(255, 255, 255)));
+    p.drawText(0, 0, this.width, this.margin + this.titleHeight, Qt.AlignCenter, this.windowTitle, 0);
+
+    var ofs = this.labelWidth + this.margin;
+    var ww = this.width - this.suffixWidth - ofs - 2 * this.margin;
+    var hue = this.startHue;
+    var y = 0;
+
+    p.translate(this.margin, this.titleHeight + 1.5 * this.margin);
+
+    for (d in this.data) {
+
+        // label on the left side
+        p.setPen(new QColor(Qt.black));
+        p.drawText(0, y, this.labelWidth, this.barHeight, Qt.AlignVCenter + Qt.AlignRight, d, 0);
+
+        // the colored bar
+        var gradient = new QLinearGradient(new QPoint(ofs, y), new QPoint(ofs, y + this.barHeight));
+        gradient.setColorAt(0, QColor.fromHsv(hue, 255, 240));
+        gradient.setColorAt(1, QColor.fromHsv(hue, 255, 92));
+        p.setBrush(new QBrush(gradient));
+        p.setPen(new QColor(96, 96, 96));
+        var bw = this.data[d] * ww / this.maxValue;
+        p.drawRect(ofs, y, bw, 
+        this.barHeight);
+
+        // extra text at the end of the bar
+        var text = new String(this.data[d] + " " + this.suffix);
+        p.setPen(new QColor(Qt.black));
+        p.drawText(ofs + bw + this.margin/2, y, this.suffixWidth, this.barHeight, Qt.AlignVCenter + Qt.AlignLeft, text, 0);
+
+        // for the next bar
+        y += (this.barHeight + this.barSpacing);
+        hue += this.hueDelta;
+        if (hue >= 360)
+            hue -= 360;
+    }
+    p.end();
+}
+
+BarChart.prototype.wheelEvent = function(event) {
+    this.startHue += event.delta() / 8 / 5;
+    if (this.startHue >= 360)
+        this.startHue -= 360;
+    if (this.startHue < 0)
+        this.startHue += 360;
+    this.update();
+    event.ignore();
+}
+
+BarChart.prototype.mousePressEvent = function(event) {
+    var fname = QFileDialog.getSaveFileName(this, "Save", ".", "*.png", 0, 0);
+    if (fname.length > 0) {
+        var img = new QImage(this.size, QImage.Format_ARGB32_Premultiplied);
+        this.render(img);
+        img.save(new QFile(fname));
+    }
+}
+
+var chart = new BarChart;
+
+chart.windowTitle = "SquirrelFish Performance";
+
+chart.suffix = "runs";
+
+chart.data = { 
+          "WebKit 3.0" :  5.4, 
+          "WebKit 3.1" : 18.8,
+        "SquirrelFish" : 29.9,
+"SquirrelFish Extreme" : 63.6
+};
+
+chart.show();
+
+QCoreApplication.exec();
+