/usr/lib/Wt/examples/painting/PaintExample.C is in witty-examples 3.3.0-1build1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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* Copyright (C) 2008 Emweb bvba, Kessel-Lo, Belgium.
*
* See the LICENSE file for terms of use.
*/
#include <Wt/WContainerWidget>
#include <Wt/WGridLayout>
#include <Wt/WSlider>
#include <Wt/WText>
#include "PaintExample.h"
#include "ShapesWidget.h"
using namespace Wt;
PaintExample::PaintExample(WContainerWidget *root, bool showTitle)
: WContainerWidget(root)
{
std::string text;
if (showTitle)
text += "<h2>Paint example</h2>";
text +=
"<p>A simple example demonstrating cross-browser vector graphics."
"</p>"
"<p>The emweb logo below is painted using the Wt WPainter API from "
"bezier paths, and rendered to the browser using inline SVG, inline VML "
"or the HTML 5 <canvas> element."
"</p>"
"<p>"
"The example also demonstrates the horizontal and vertical "
"<a href=\"http://www.webtoolkit.eu/wt/doc/reference/html/classWt_1_1WSlider.html\" target=\"_blank\">"
"WSlider</a> widgets. Here,"
"the events of the WSlider widgets are used to scale and rotate the "
"emweb logo."
"</p>"
"<p>"
"In non-IE browsers, a different backend is used for positive or negative "
"angles (SVG or HTML canvas)."
"</p>";
new WText(text, this);
WContainerWidget *emweb = new WContainerWidget(this);
emweb->setMargin(WLength::Auto, Left | Right);
WGridLayout *layout = new WGridLayout();
emweb->setLayout(layout);
WSlider *scaleSlider = new WSlider(Horizontal);
scaleSlider->setMinimum(0);
scaleSlider->setMaximum(20);
scaleSlider->setValue(10);
scaleSlider->setTickInterval(5);
scaleSlider->setTickPosition(WSlider::TicksBothSides);
scaleSlider->resize(300, 50);
scaleSlider->sliderMoved().connect(this, &PaintExample::scaleShape);
layout->addWidget(scaleSlider, 0, 1, AlignCenter | AlignMiddle);
WSlider *rotateSlider = new WSlider(Vertical);
rotateSlider->setMinimum(-30);
rotateSlider->setMaximum(30);
rotateSlider->setValue(0);
rotateSlider->setTickInterval(10);
rotateSlider->setTickPosition(WSlider::TicksBothSides);
rotateSlider->resize(50, 400);
rotateSlider->sliderMoved().connect(this, &PaintExample::rotateShape);
layout->addWidget(rotateSlider, 1, 0, AlignCenter | AlignMiddle);
shapes_ = new ShapesWidget();
shapes_->setAngle(0.0);
shapes_->setRelativeSize(0.5);
shapes_->setPreferredMethod(WPaintedWidget::HtmlCanvas);
layout->addWidget(shapes_, 1, 1, AlignCenter | AlignMiddle);
}
void PaintExample::rotateShape(int v)
{
shapes_->setAngle(v / 2.0);
// Being silly: test alternate rendering method
shapes_->setPreferredMethod(v < 0 ? WPaintedWidget::InlineSvgVml
: WPaintedWidget::HtmlCanvas);
}
void PaintExample::scaleShape(int v)
{
shapes_->setRelativeSize(0.1 + 0.9 * (v/20.0));
}
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