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16 <h1>view.cpp
</h1><a href=
"view_8cpp.html">Go to the documentation of this file.
</a><div class=
"fragment"><pre class=
"fragment"><a name=
"l00001"></a>00001 <span class=
"comment">/*
</span>
17 <a name=
"l00002"></a>00002 <span class=
"comment"> QOpenCamWidget demo application main window (view.c)
</span>
18 <a name=
"l00003"></a>00003 <span class=
"comment"> This file is part of a demonstration application, illustrating
</span>
19 <a name=
"l00004"></a>00004 <span class=
"comment"> how to use the QOpenCamWidget, a Qt
4 widget that displays
</span>
20 <a name=
"l00005"></a>00005 <span class=
"comment"> video input from a webcam, along with a snapshot button.
</span>
21 <a name=
"l00006"></a>00006 <span class=
"comment"></span>
22 <a name=
"l00007"></a>00007 <span class=
"comment"> Copyright (C)
2009 Jon Langseth
</span>
23 <a name=
"l00008"></a>00008 <span class=
"comment"></span>
24 <a name=
"l00009"></a>00009 <span class=
"comment"> This program is free software; you can redistribute it and/or
</span>
25 <a name=
"l00010"></a>00010 <span class=
"comment"> modify it under the terms of the GNU General Public License
</span>
26 <a name=
"l00011"></a>00011 <span class=
"comment"> as published by the Free Software Foundation in its version
2</span>
27 <a name=
"l00012"></a>00012 <span class=
"comment"> of the License.
</span>
28 <a name=
"l00013"></a>00013 <span class=
"comment"></span>
29 <a name=
"l00014"></a>00014 <span class=
"comment"> This program is distributed in the hope that it will be useful,
</span>
30 <a name=
"l00015"></a>00015 <span class=
"comment"> but WITHOUT ANY WARRANTY; without even the implied warranty of
</span>
31 <a name=
"l00016"></a>00016 <span class=
"comment"> MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
</span>
32 <a name=
"l00017"></a>00017 <span class=
"comment"> GNU General Public License for more details.
</span>
33 <a name=
"l00018"></a>00018 <span class=
"comment"></span>
34 <a name=
"l00019"></a>00019 <span class=
"comment"> You should have received a copy of the GNU General Public License
</span>
35 <a name=
"l00020"></a>00020 <span class=
"comment"> along with this program; if not, write to the Free Software
</span>
36 <a name=
"l00021"></a>00021 <span class=
"comment"> Foundation, Inc.,
51 Franklin Street, Fifth Floor, Boston, MA
02110-
1301, USA.
</span>
37 <a name=
"l00022"></a>00022 <span class=
"comment"> */
</span>
38 <a name=
"l00023"></a>00023
39 <a name=
"l00024"></a>00024 <span class=
"preprocessor">#include
"<a class="code
" href="view_8h.html
">view.h</a>"</span>
40 <a name=
"l00025"></a>00025 <span class=
"preprocessor">#include
"<a class="code
" href="qopencamwidget_8h.html
">qopencamwidget.h</a>"</span>
41 <a name=
"l00026"></a>00026
42 <a name=
"l00027"></a>00027 <span class=
"comment">// The View class is a QMainWindow, used to display our QOpenCamWidget
</span>
43 <a name=
"l00028"></a>00028 <span class=
"comment">// The constructor of the View takes care of setting up the Widget,
</span>
44 <a name=
"l00029"></a>00029 <span class=
"comment">// and handles the result of a user clicking (or activating) the widget's
</span>
45 <a name=
"l00030"></a>00030 <span class=
"comment">//
"Take snapshot" button.
</span>
46 <a name=
"l00031"></a>00031
47 <a name=
"l00032"></a><a class=
"code" href=
"classView.html#74d64dd513eae96bc3196131f865a4e8">00032</a> <a class=
"code" href=
"classView.html#74d64dd513eae96bc3196131f865a4e8">View::View
</a>( QWidget *parent)
48 <a name=
"l00033"></a>00033 : QMainWindow(parent)
49 <a name=
"l00034"></a>00034 {
50 <a name=
"l00035"></a>00035
51 <a name=
"l00036"></a>00036 <span class=
"comment">// Create the widget, setting the Main window (this) as its parent.
</span>
52 <a name=
"l00037"></a>00037 <a class=
"code" href=
"classQOpenCamWidget.html">QOpenCamWidget
</a> *cw =
<span class=
"keyword">new
</span> <a class=
"code" href=
"classQOpenCamWidget.html">QOpenCamWidget
</a>(
<span class=
"keyword">this
</span>);
53 <a name=
"l00038"></a>00038
54 <a name=
"l00039"></a>00039 <span class=
"comment">// bool QOpenCamWidget::grabCapture(int source) tries to get a
</span>
55 <a name=
"l00040"></a>00040 <span class=
"comment">// video capture handle from OpenCV, using the source number
</span>
56 <a name=
"l00041"></a>00041 <span class=
"comment">// as the device to open. Here I use -
1 as the number, meaning
</span>
57 <a name=
"l00042"></a>00042 <span class=
"comment">//
"give me any supported and available video devica you can find".
</span>
58 <a name=
"l00043"></a>00043 <span class=
"keywordflow">if
</span> ( cw-
><a class=
"code" href=
"classQOpenCamWidget.html#23574314cbd7a74bc6f32a640041d55a" title=
"Grabs an OpenCV video capture source.">grabCapture
</a>(-
1) )
59 <a name=
"l00044"></a>00044 {
60 <a name=
"l00045"></a>00045 <span class=
"comment">// grabCapture() returns true on success. This means that
</span>
61 <a name=
"l00046"></a>00046 <span class=
"comment">// we have a capture device available, and can start streaming
</span>
62 <a name=
"l00047"></a>00047 <span class=
"comment">// video from the device to display on the widget.
</span>
63 <a name=
"l00048"></a>00048
64 <a name=
"l00049"></a>00049 <span class=
"comment">// TODO: Document this feature..
</span>
65 <a name=
"l00050"></a>00050 cw-
><a class=
"code" href=
"classQOpenCamWidget.html#8f885a8bb88870cd19cfc9eb4e02e2ce" title=
"Changes the visibility of the optional built-in &quot;Take snapshot&quot; button...">setSnapshotVisible
</a>(
<span class=
"keyword">true
</span>);
66 <a name=
"l00051"></a>00051
67 <a name=
"l00052"></a>00052 <span class=
"comment">// Video output does not start until QOpenCamWidget::startCapture()
</span>
68 <a name=
"l00053"></a>00053 <span class=
"comment">// is explicitly called.
</span>
69 <a name=
"l00054"></a>00054 cw-
><a class=
"code" href=
"classQOpenCamWidget.html#b378daa447e8d9b94e1c7c8c6853b880" title=
"Starts up grabbing of video frames.">startCapture
</a>();
70 <a name=
"l00055"></a>00055 }
71 <a name=
"l00056"></a>00056
72 <a name=
"l00057"></a>00057 <span class=
"comment">// The QOpenCamWidget does not provide a video stream for further
</span>
73 <a name=
"l00058"></a>00058 <span class=
"comment">// processing, but it does provide a snapshot of the stream if
</span>
74 <a name=
"l00059"></a>00059 <span class=
"comment">// the SLOT void QOpenCamWidget::startSnap(void) is triggered.
</span>
75 <a name=
"l00060"></a>00060 <span class=
"comment">// In this demo app, the slot is connected to the widgets
</span>
76 <a name=
"l00061"></a>00061 <span class=
"comment">// internal
"Take snapshot" trigger button, but the SLOT is
</span>
77 <a name=
"l00062"></a>00062 <span class=
"comment">// public, and may easily be triggered from
"outside".
</span>
78 <a name=
"l00063"></a>00063 <span class=
"comment">//
</span>
79 <a name=
"l00064"></a>00064 <span class=
"comment">// When startSnap() is triggered, it will use a SIGNAL to return
</span>
80 <a name=
"l00065"></a>00065 <span class=
"comment">// its image, if the aquisition was successful. The image
</span>
81 <a name=
"l00066"></a>00066 <span class=
"comment">// will be available through QOpenCamWidget::imageReady(Qimage);
</span>
82 <a name=
"l00067"></a>00067 <span class=
"comment">// In this sample, I hook that signal up to a slot on this QMainWindow,
</span>
83 <a name=
"l00068"></a>00068 <span class=
"comment">// that saves the image, and exits the application.
</span>
84 <a name=
"l00069"></a>00069 connect( cw, SIGNAL(imageReady(QImage)),
<span class=
"keyword">this
</span>, SLOT(
<a class=
"code" href=
"classView.html#4b82b2654c9dd798bce121f02b30a810">saveImage
</a>(QImage)));
85 <a name=
"l00070"></a>00070
86 <a name=
"l00071"></a>00071 this-
>setCentralWidget(cw);
87 <a name=
"l00072"></a>00072 }
88 <a name=
"l00073"></a>00073
89 <a name=
"l00074"></a><a class=
"code" href=
"classView.html#450dfab3f21a52edc03db4310593412f">00074</a> <a class=
"code" href=
"classView.html#450dfab3f21a52edc03db4310593412f">View::~View
</a>(
<span class=
"keywordtype">void
</span>)
90 <a name=
"l00075"></a>00075 {
91 <a name=
"l00076"></a>00076 }
92 <a name=
"l00077"></a>00077
93 <a name=
"l00078"></a><a class=
"code" href=
"classView.html#4b82b2654c9dd798bce121f02b30a810">00078</a> <span class=
"keywordtype">void
</span> <a class=
"code" href=
"classView.html#4b82b2654c9dd798bce121f02b30a810">View::saveImage
</a>(QImage image)
94 <a name=
"l00079"></a>00079 {
95 <a name=
"l00080"></a>00080 <span class=
"comment">// This is the SLOT that recieves QOpenCamWidget::imageReady(QImage) SIGNAL.
</span>
96 <a name=
"l00081"></a>00081 <span class=
"comment">// To keep the example as simple as possible, I do as little as possible..
</span>
97 <a name=
"l00082"></a>00082 qDebug()
<< <span class=
"stringliteral">"Recieved an image of size "</span>
98 <a name=
"l00083"></a>00083 << image.width()
<< <span class=
"stringliteral">"x"</span> << image.height();
99 <a name=
"l00084"></a>00084 image.save(
<span class=
"stringliteral">"snapshot.png"</span>);
100 <a name=
"l00085"></a>00085
101 <a name=
"l00086"></a>00086 QApplication::exit();
102 <a name=
"l00087"></a>00087 }
104 <hr size=
"1"><address style=
"text-align: right;"><small>Generated on Thu Jun
11 01:
49:
57 2009 for QOpenCamWidget by
105 <a href=
"http://www.doxygen.org/index.html">
106 <img src=
"doxygen.png" alt=
"doxygen" align=
"middle" border=
"0"></a> 1.5.6 </small></address>