<div dir="ltr">Hi All,<div><br></div><div>I am trying to show painting effect on QVTKwidget using QT painting mechanism.</div><div>As User press mouse button and move cursor I want to paint circular region under cursor. For this I have derived my widget class from QVTKwidget and am overriding its paintevent method. </div><div><br></div><div>If I do same operation while overriding my class from QWidget it works fine,</div><div>But wth QVTKWidget I am not having any luck. It doesn't show painting effect.</div><div><br></div><div>Following is my source code . Could you please help me figure out problem in my source code ?<br></div><div><br></div><div>header file</div><div>-----------------------</div><div><pre style="margin-top:0px;margin-bottom:0px"><span style="color:rgb(85,85,255)">#ifndef</span><span style="color:rgb(192,192,192)"> </span>MYWIDGET_H</pre>
<pre style="margin-top:0px;margin-bottom:0px"><span style="color:rgb(85,85,255)">#define</span><span style="color:rgb(192,192,192)"> </span><span style="color:rgb(85,85,255)">MYWIDGET_H</span></pre>
<pre style="margin-top:0px;margin-bottom:0px"><br></pre>
<pre style="margin-top:0px;margin-bottom:0px"><span style="color:rgb(85,85,255)">#include</span><span style="color:rgb(192,192,192)"> </span><span style="color:rgb(255,85,255)"><QWidget></span></pre>
<pre style="margin-top:0px;margin-bottom:0px"><span style="color:rgb(85,85,255)">#include</span><span style="color:rgb(192,192,192)"> </span><span style="color:rgb(255,85,255)"><QVTKWidget.h></span></pre>
<pre style="margin-top:0px;margin-bottom:0px"><br></pre>
<pre style="margin-top:0px;margin-bottom:0px"><span style="color:rgb(255,255,85)">class</span><span style="color:rgb(192,192,192)"> </span><span style="color:rgb(85,255,85)">MyWidget</span><span style="color:rgb(192,192,192)"> </span><span style="color:rgb(170,170,170)">:</span><span style="color:rgb(192,192,192)"> </span><span style="color:rgb(255,255,85)">public</span><span style="color:rgb(192,192,192)"> </span><span style="color:rgb(85,255,85)">QVTKWidget</span></pre>
<pre style="margin-top:0px;margin-bottom:0px"><span style="color:rgb(170,170,170)">{</span></pre>
<pre style="margin-top:0px;margin-bottom:0px"><span style="color:rgb(192,192,192)"> </span><span style="color:rgb(85,85,255)">Q_OBJECT</span></pre>
<pre style="margin-top:0px;margin-bottom:0px"><span style="color:rgb(255,255,85)">public</span><span style="color:rgb(170,170,170)">:</span></pre>
<pre style="margin-top:0px;margin-bottom:0px"><span style="color:rgb(192,192,192)"> </span><span style="color:rgb(255,255,85)">explicit</span><span style="color:rgb(192,192,192)"> </span><span style="color:rgb(85,255,85)">MyWidget</span><span style="color:rgb(170,170,170)">(</span><span style="color:rgb(85,255,85)">QWidget</span><span style="color:rgb(192,192,192)"> </span><span style="color:rgb(170,170,170)">*</span>parent<span style="color:rgb(192,192,192)"> </span><span style="color:rgb(170,170,170)">=</span><span style="color:rgb(192,192,192)"> </span><span style="color:rgb(255,85,255)">0</span><span style="color:rgb(170,170,170)">);</span></pre>
<pre style="margin-top:0px;margin-bottom:0px"><br></pre>
<pre style="margin-top:0px;margin-bottom:0px"><span style="color:rgb(255,255,85)">protected</span><span style="color:rgb(170,170,170)">:</span></pre>
<pre style="margin-top:0px;margin-bottom:0px"><span style="color:rgb(192,192,192)"> </span><span style="color:rgb(85,255,255)">//</span><span style="color:rgb(192,192,192)"> </span><span style="color:rgb(85,255,255)">QPaintEngine</span><span style="color:rgb(192,192,192)"> </span><span style="color:rgb(85,255,255)">*</span><span style="color:rgb(192,192,192)"> </span><span style="color:rgb(85,255,255)">paintEngine()</span><span style="color:rgb(192,192,192)"> </span><span style="color:rgb(85,255,255)">const;</span></pre>
<pre style="margin-top:0px;margin-bottom:0px"><span style="color:rgb(192,192,192)"> </span><span style="color:rgb(255,255,85)">void</span><span style="color:rgb(192,192,192)"> </span><span style="font-style:italic">paintEvent</span><span style="color:rgb(170,170,170)">(</span><span style="color:rgb(85,255,85)">QPaintEvent</span><span style="color:rgb(192,192,192)"> </span><span style="color:rgb(170,170,170)">*</span>event<span style="color:rgb(170,170,170)">);</span></pre>
<pre style="margin-top:0px;margin-bottom:0px"><span style="color:rgb(192,192,192)"> </span><span style="color:rgb(255,255,85)">void</span><span style="color:rgb(192,192,192)"> </span><span style="font-style:italic">mousePressEvent</span><span style="color:rgb(170,170,170)">(</span><span style="color:rgb(85,255,85)">QMouseEvent</span><span style="color:rgb(192,192,192)"> </span><span style="color:rgb(170,170,170)">*</span>event<span style="color:rgb(170,170,170)">);</span></pre>
<pre style="margin-top:0px;margin-bottom:0px"><span style="color:rgb(192,192,192)"> </span><span style="color:rgb(255,255,85)">void</span><span style="color:rgb(192,192,192)"> </span><span style="font-style:italic">mouseReleaseEvent</span><span style="color:rgb(170,170,170)">(</span><span style="color:rgb(85,255,85)">QMouseEvent</span><span style="color:rgb(192,192,192)"> </span><span style="color:rgb(170,170,170)">*</span>event<span style="color:rgb(170,170,170)">);</span></pre>
<pre style="margin-top:0px;margin-bottom:0px"><span style="color:rgb(192,192,192)"> </span><span style="color:rgb(255,255,85)">void</span><span style="color:rgb(192,192,192)"> </span><span style="font-style:italic">mouseMoveEvent</span><span style="color:rgb(170,170,170)">(</span><span style="color:rgb(85,255,85)">QMouseEvent</span><span style="color:rgb(170,170,170)">*</span><span style="color:rgb(192,192,192)"> </span>event<span style="color:rgb(170,170,170)">);</span></pre>
<pre style="margin-top:0px;margin-bottom:0px"><span style="color:rgb(192,192,192)"> </span><span style="color:rgb(255,255,85)">int</span><span style="color:rgb(192,192,192)"> </span>x<span style="color:rgb(170,170,170)">;</span></pre>
<pre style="margin-top:0px;margin-bottom:0px"><span style="color:rgb(192,192,192)"> </span><span style="color:rgb(255,255,85)">int</span><span style="color:rgb(192,192,192)"> </span>y<span style="color:rgb(170,170,170)">;</span></pre>
<pre style="margin-top:0px;margin-bottom:0px"><span style="color:rgb(85,255,85)">std</span><span style="color:rgb(170,170,170)">::</span><span style="color:rgb(85,255,85)">vector</span><span style="color:rgb(170,170,170)"><</span><span style="color:rgb(255,255,85)">int</span><span style="color:rgb(170,170,170)">></span><span style="color:rgb(192,192,192)"> </span>vec<span style="color:rgb(170,170,170)">;</span></pre>
<pre style="margin-top:0px;margin-bottom:0px"><span style="color:rgb(255,255,85)">bool</span><span style="color:rgb(192,192,192)"> </span>m_pressed<span style="color:rgb(170,170,170)">;</span></pre>
<pre style="margin-top:0px;margin-bottom:0px"><br></pre>
<pre style="margin-top:0px;margin-bottom:0px"><span style="color:rgb(255,255,85)">signals</span><span style="color:rgb(170,170,170)">:</span></pre>
<pre style="margin-top:0px;margin-bottom:0px"><br></pre>
<pre style="margin-top:0px;margin-bottom:0px"><span style="color:rgb(255,255,85)">public</span><span style="color:rgb(192,192,192)"> </span><span style="color:rgb(255,255,85)">slots</span><span style="color:rgb(170,170,170)">:</span></pre>
<pre style="margin-top:0px;margin-bottom:0px"><span style="color:rgb(170,170,170)">};</span></pre>
<pre style="margin-top:0px;margin-bottom:0px"><br></pre>
<pre style="margin-top:0px;margin-bottom:0px"><span style="color:rgb(85,85,255)">#endif</span><span style="color:rgb(192,192,192)"> </span><span style="color:rgb(85,255,255)">//</span><span style="color:rgb(192,192,192)"> </span><span style="color:rgb(85,255,255)">MYWIDGET_H</span></pre>
<pre style="margin-top:0px;margin-bottom:0px"><br></pre></div><div>Source file</div><div>------------------------</div><div><br></div><div><pre style="margin-top:0px;margin-bottom:0px"><span style="color:rgb(85,85,255)">#include</span><span style="color:rgb(192,192,192)"> </span><span style="color:rgb(255,85,255)">"mywidget.h"</span></pre>
<pre style="margin-top:0px;margin-bottom:0px"><span style="color:rgb(85,85,255)">#include</span><span style="color:rgb(192,192,192)"> </span><span style="color:rgb(255,85,255)"><QPainter></span></pre>
<pre style="margin-top:0px;margin-bottom:0px"><span style="color:rgb(85,85,255)">#include</span><span style="color:rgb(192,192,192)"> </span><span style="color:rgb(255,85,255)"><QPen></span></pre>
<pre style="margin-top:0px;margin-bottom:0px"><span style="color:rgb(85,85,255)">#include</span><span style="color:rgb(192,192,192)"> </span><span style="color:rgb(255,85,255)"><QPolygon></span></pre>
<pre style="margin-top:0px;margin-bottom:0px"><span style="color:rgb(85,85,255)">#include</span><span style="color:rgb(192,192,192)"> </span><span style="color:rgb(255,85,255)"><QMouseEvent></span></pre>
<pre style="margin-top:0px;margin-bottom:0px"><span style="color:rgb(85,85,255)">#include</span><span style="color:rgb(192,192,192)"> </span><span style="color:rgb(255,85,255)"><QLabel></span></pre>
<pre style="margin-top:0px;margin-bottom:0px"><span style="color:rgb(85,85,255)">#include</span><span style="color:rgb(192,192,192)"> </span><span style="color:rgb(255,85,255)"><qdebug.h></span></pre>
<pre style="margin-top:0px;margin-bottom:0px"><br></pre>
<pre style="margin-top:0px;margin-bottom:0px"><span style="color:rgb(85,255,85)">MyWidget</span><span style="color:rgb(170,170,170)">::</span>MyWidget<span style="color:rgb(170,170,170)">(</span><span style="color:rgb(85,255,85)">QWidget</span><span style="color:rgb(192,192,192)"> </span><span style="color:rgb(170,170,170)">*</span>parent<span style="color:rgb(170,170,170)">)</span><span style="color:rgb(192,192,192)"> </span><span style="color:rgb(170,170,170)">:</span><span style="color:rgb(192,192,192)"> </span><span style="color:rgb(85,255,85)">QVTKWidget</span><span style="color:rgb(170,170,170)">(</span>parent<span style="color:rgb(170,170,170)">)</span></pre>
<pre style="margin-top:0px;margin-bottom:0px"><span style="color:rgb(170,170,170)">{</span></pre>
<pre style="margin-top:0px;margin-bottom:0px">x<span style="color:rgb(170,170,170)">=</span><span style="color:rgb(255,85,255)">100</span><span style="color:rgb(170,170,170)">;</span></pre>
<pre style="margin-top:0px;margin-bottom:0px">y<span style="color:rgb(170,170,170)">=</span><span style="color:rgb(255,85,255)">100</span><span style="color:rgb(170,170,170)">;</span></pre>
<pre style="margin-top:0px;margin-bottom:0px">m_pressed<span style="color:rgb(192,192,192)"> </span><span style="color:rgb(170,170,170)">=</span><span style="color:rgb(192,192,192)"> </span><span style="color:rgb(255,255,85)">false</span><span style="color:rgb(170,170,170)">;</span></pre>
<pre style="margin-top:0px;margin-bottom:0px"><span style="color:rgb(170,170,170)">}</span></pre>
<pre style="margin-top:0px;margin-bottom:0px"><br></pre>
<pre style="margin-top:0px;margin-bottom:0px"><span style="color:rgb(85,255,255)">//QPaintEngine</span><span style="color:rgb(192,192,192)"> </span><span style="color:rgb(85,255,255)">*</span><span style="color:rgb(192,192,192)"> </span><span style="color:rgb(85,255,255)">MyWidget::paintEngine()</span><span style="color:rgb(192,192,192)"> </span><span style="color:rgb(85,255,255)">const</span></pre>
<pre style="margin-top:0px;margin-bottom:0px"><span style="color:rgb(85,255,255)">//{</span></pre>
<pre style="margin-top:0px;margin-bottom:0px"><span style="color:rgb(85,255,255)">//</span><span style="color:rgb(192,192,192)"> </span><span style="color:rgb(85,255,255)">return</span><span style="color:rgb(192,192,192)"> </span><span style="color:rgb(85,255,255)">QVTKWidget::paintEngine();</span></pre>
<pre style="margin-top:0px;margin-bottom:0px"><span style="color:rgb(85,255,255)">//}</span></pre>
<pre style="margin-top:0px;margin-bottom:0px"><br></pre>
<pre style="margin-top:0px;margin-bottom:0px"><span style="color:rgb(255,255,85)">void</span><span style="color:rgb(192,192,192)"> </span><span style="color:rgb(85,255,85)">MyWidget</span><span style="color:rgb(170,170,170)">::</span><span style="font-style:italic">paintEvent</span><span style="color:rgb(170,170,170)">(</span><span style="color:rgb(85,255,85)">QPaintEvent</span><span style="color:rgb(192,192,192)"> </span><span style="color:rgb(170,170,170)">*</span>event<span style="color:rgb(170,170,170)">)</span></pre>
<pre style="margin-top:0px;margin-bottom:0px"><span style="color:rgb(170,170,170)">{</span></pre>
<pre style="margin-top:0px;margin-bottom:0px"><span style="color:rgb(192,192,192)"> </span><span style="color:rgb(85,255,255)">//create</span><span style="color:rgb(192,192,192)"> </span><span style="color:rgb(85,255,255)">a</span><span style="color:rgb(192,192,192)"> </span><span style="color:rgb(85,255,255)">QPainter</span><span style="color:rgb(192,192,192)"> </span><span style="color:rgb(85,255,255)">and</span><span style="color:rgb(192,192,192)"> </span><span style="color:rgb(85,255,255)">pass</span><span style="color:rgb(192,192,192)"> </span><span style="color:rgb(85,255,255)">a</span><span style="color:rgb(192,192,192)"> </span><span style="color:rgb(85,255,255)">pointer</span><span style="color:rgb(192,192,192)"> </span><span style="color:rgb(85,255,255)">to</span><span style="color:rgb(192,192,192)"> </span><span style="color:rgb(85,255,255)">the</span><span style="color:rgb(192,192,192)"> </span><span style="color:rgb(85,255,255)">device.</span></pre>
<pre style="margin-top:0px;margin-bottom:0px"><span style="color:rgb(192,192,192)"> </span><span style="color:rgb(85,255,255)">//A</span><span style="color:rgb(192,192,192)"> </span><span style="color:rgb(85,255,255)">paint</span><span style="color:rgb(192,192,192)"> </span><span style="color:rgb(85,255,255)">device</span><span style="color:rgb(192,192,192)"> </span><span style="color:rgb(85,255,255)">can</span><span style="color:rgb(192,192,192)"> </span><span style="color:rgb(85,255,255)">be</span><span style="color:rgb(192,192,192)"> </span><span style="color:rgb(85,255,255)">a</span><span style="color:rgb(192,192,192)"> </span><span style="color:rgb(85,255,255)">QWidget,</span><span style="color:rgb(192,192,192)"> </span><span style="color:rgb(85,255,255)">a</span><span style="color:rgb(192,192,192)"> </span><span style="color:rgb(85,255,255)">QPixmap</span><span style="color:rgb(192,192,192)"> </span><span style="color:rgb(85,255,255)">or</span><span style="color:rgb(192,192,192)"> </span><span style="color:rgb(85,255,255)">a</span><span style="color:rgb(192,192,192)"> </span><span style="color:rgb(85,255,255)">QImage</span></pre>
<pre style="margin-top:0px;margin-bottom:0px"><span style="color:rgb(192,192,192)"> </span><span style="color:rgb(85,255,85)">QPainter</span><span style="color:rgb(192,192,192)"> </span>painter<span style="color:rgb(170,170,170)">(</span><span style="color:rgb(255,255,85)">this</span><span style="color:rgb(170,170,170)">);</span></pre>
<pre style="margin-top:0px;margin-bottom:0px"><br></pre>
<pre style="margin-top:0px;margin-bottom:0px"><span style="color:rgb(192,192,192)"> </span><span style="color:rgb(85,255,255)">//create</span><span style="color:rgb(192,192,192)"> </span><span style="color:rgb(85,255,255)">a</span><span style="color:rgb(192,192,192)"> </span><span style="color:rgb(85,255,255)">black</span><span style="color:rgb(192,192,192)"> </span><span style="color:rgb(85,255,255)">pen</span><span style="color:rgb(192,192,192)"> </span><span style="color:rgb(85,255,255)">that</span><span style="color:rgb(192,192,192)"> </span><span style="color:rgb(85,255,255)">has</span><span style="color:rgb(192,192,192)"> </span><span style="color:rgb(85,255,255)">solid</span><span style="color:rgb(192,192,192)"> </span><span style="color:rgb(85,255,255)">line</span></pre>
<pre style="margin-top:0px;margin-bottom:0px"><span style="color:rgb(192,192,192)"> </span><span style="color:rgb(85,255,255)">//and</span><span style="color:rgb(192,192,192)"> </span><span style="color:rgb(85,255,255)">the</span><span style="color:rgb(192,192,192)"> </span><span style="color:rgb(85,255,255)">width</span><span style="color:rgb(192,192,192)"> </span><span style="color:rgb(85,255,255)">is</span><span style="color:rgb(192,192,192)"> </span><span style="color:rgb(85,255,255)">2.</span></pre>
<pre style="margin-top:0px;margin-bottom:0px"><span style="color:rgb(192,192,192)"> </span>painter<span style="color:rgb(170,170,170)">.</span>setBrush<span style="color:rgb(170,170,170)">(</span><span style="color:rgb(85,255,85)">QBrush</span><span style="color:rgb(170,170,170)">(</span><span style="color:rgb(85,255,85)">Qt</span><span style="color:rgb(170,170,170)">::</span><span style="font-style:italic;color:rgb(85,255,85)">red</span><span style="color:rgb(170,170,170)">));</span></pre>
<pre style="margin-top:0px;margin-bottom:0px"><span style="color:rgb(192,192,192)"> </span>painter<span style="color:rgb(170,170,170)">.</span>setPen<span style="color:rgb(170,170,170)">(</span><span style="color:rgb(85,255,85)">QPen</span><span style="color:rgb(170,170,170)">(</span><span style="color:rgb(85,255,85)">Qt</span><span style="color:rgb(170,170,170)">::</span><span style="font-style:italic;color:rgb(85,255,85)">red</span><span style="color:rgb(170,170,170)">));</span></pre>
<pre style="margin-top:0px;margin-bottom:0px"><span style="color:rgb(192,192,192)"> </span><span style="color:rgb(255,255,85)">int</span><span style="color:rgb(192,192,192)"> </span>radius<span style="color:rgb(192,192,192)"> </span><span style="color:rgb(170,170,170)">=</span><span style="color:rgb(192,192,192)"> </span><span style="color:rgb(255,85,255)">20</span><span style="color:rgb(170,170,170)">;</span></pre>
<pre style="margin-top:0px;margin-bottom:0px"><span style="color:rgb(192,192,192)"> </span><span style="color:rgb(255,255,85)">bool</span><span style="color:rgb(192,192,192)"> </span>point_Flag<span style="color:rgb(192,192,192)"> </span><span style="color:rgb(170,170,170)">=</span><span style="color:rgb(192,192,192)"> </span><span style="color:rgb(255,255,85)">false</span><span style="color:rgb(170,170,170)">;</span></pre>
<pre style="margin-top:0px;margin-bottom:0px"><span style="color:rgb(192,192,192)"> </span><span style="color:rgb(255,255,85)">if</span><span style="color:rgb(192,192,192)"> </span><span style="color:rgb(170,170,170)">(!</span>point_Flag<span style="color:rgb(170,170,170)">)</span><span style="color:rgb(192,192,192)"> </span><span style="color:rgb(170,170,170)">{</span></pre>
<pre style="margin-top:0px;margin-bottom:0px"><span style="color:rgb(192,192,192)"> </span><span style="color:rgb(85,85,255)">qDebug</span><span style="color:rgb(170,170,170)">()</span><span style="color:rgb(192,192,192)"> </span><span style="color:rgb(170,170,170)"><<</span><span style="color:rgb(192,192,192)"> </span><span style="color:rgb(255,85,255)">"vector</span><span style="color:rgb(192,192,192)"> </span><span style="color:rgb(255,85,255)">size:"</span><span style="color:rgb(192,192,192)"> </span><span style="color:rgb(170,170,170)"><<</span>vec<span style="color:rgb(170,170,170)">.</span>size<span style="color:rgb(170,170,170)">();</span></pre>
<pre style="margin-top:0px;margin-bottom:0px"><span style="color:rgb(192,192,192)"> </span><span style="color:rgb(255,255,85)">int</span><span style="color:rgb(192,192,192)"> </span>xx<span style="color:rgb(170,170,170)">,</span>yy<span style="color:rgb(170,170,170)">;</span></pre>
<pre style="margin-top:0px;margin-bottom:0px"><span style="color:rgb(192,192,192)"> </span><span style="color:rgb(255,255,85)">for</span><span style="color:rgb(170,170,170)">(</span><span style="color:rgb(255,255,85)">int</span><span style="color:rgb(192,192,192)"> </span>i<span style="color:rgb(170,170,170)">=</span><span style="color:rgb(255,85,255)">0</span><span style="color:rgb(170,170,170)">;</span>i<span style="color:rgb(170,170,170)"><</span>vec<span style="color:rgb(170,170,170)">.</span>size<span style="color:rgb(170,170,170)">();</span>i<span style="color:rgb(170,170,170)">+=</span><span style="color:rgb(255,85,255)">2</span><span style="color:rgb(170,170,170)">)</span><span style="color:rgb(192,192,192)"> </span><span style="color:rgb(170,170,170)">{</span></pre>
<pre style="margin-top:0px;margin-bottom:0px"><span style="color:rgb(192,192,192)"> </span><span style="color:rgb(85,255,255)">//draw</span><span style="color:rgb(192,192,192)"> </span><span style="color:rgb(85,255,255)">a</span><span style="color:rgb(192,192,192)"> </span><span style="color:rgb(85,255,255)">point</span></pre>
<pre style="margin-top:0px;margin-bottom:0px"><span style="color:rgb(192,192,192)"> </span>xx<span style="color:rgb(192,192,192)"> </span><span style="color:rgb(170,170,170)">=</span><span style="color:rgb(192,192,192)"> </span>vec<span style="color:rgb(170,170,170)">[</span>i<span style="color:rgb(170,170,170)">];</span></pre>
<pre style="margin-top:0px;margin-bottom:0px"><span style="color:rgb(192,192,192)"> </span>yy<span style="color:rgb(170,170,170)">=</span>vec<span style="color:rgb(170,170,170)">[</span>i<span style="color:rgb(170,170,170)">+</span><span style="color:rgb(255,85,255)">1</span><span style="color:rgb(170,170,170)">];</span></pre>
<pre style="margin-top:0px;margin-bottom:0px"><span style="color:rgb(192,192,192)"> </span>painter<span style="color:rgb(170,170,170)">.</span>drawEllipse<span style="color:rgb(170,170,170)">(</span><span style="color:rgb(85,255,85)">QPointF</span><span style="color:rgb(170,170,170)">(</span>xx<span style="color:rgb(170,170,170)">,</span>yy<span style="color:rgb(170,170,170)">),</span><span style="color:rgb(192,192,192)"> </span>radius<span style="color:rgb(170,170,170)">,</span><span style="color:rgb(192,192,192)"> </span>radius<span style="color:rgb(170,170,170)">);</span></pre>
<pre style="margin-top:0px;margin-bottom:0px"><span style="color:rgb(192,192,192)"> </span><span style="color:rgb(170,170,170)">}</span></pre>
<pre style="margin-top:0px;margin-bottom:0px"><span style="color:rgb(192,192,192)"> </span><span style="color:rgb(170,170,170)">}</span><span style="color:rgb(192,192,192)"> </span><span style="color:rgb(255,255,85)">else</span><span style="color:rgb(192,192,192)"> </span><span style="color:rgb(170,170,170)">{</span></pre>
<pre style="margin-top:0px;margin-bottom:0px"><span style="color:rgb(192,192,192)"> </span><span style="color:rgb(255,255,85)">int</span><span style="color:rgb(192,192,192)"> </span>mx<span style="color:rgb(170,170,170)">,</span>my<span style="color:rgb(170,170,170)">;</span></pre>
<pre style="margin-top:0px;margin-bottom:0px"><span style="color:rgb(192,192,192)"> </span><span style="color:rgb(255,255,85)">for</span><span style="color:rgb(170,170,170)">(</span><span style="color:rgb(255,255,85)">int</span><span style="color:rgb(192,192,192)"> </span>i<span style="color:rgb(170,170,170)">=</span><span style="color:rgb(255,85,255)">0</span><span style="color:rgb(170,170,170)">;</span>i<span style="color:rgb(170,170,170)"><</span>vec<span style="color:rgb(170,170,170)">.</span>size<span style="color:rgb(170,170,170)">();</span>i<span style="color:rgb(170,170,170)">+=</span><span style="color:rgb(255,85,255)">2</span><span style="color:rgb(170,170,170)">)</span><span style="color:rgb(192,192,192)"> </span><span style="color:rgb(170,170,170)">{</span></pre>
<pre style="margin-top:0px;margin-bottom:0px"><span style="color:rgb(192,192,192)"> </span><span style="color:rgb(85,255,255)">//draw</span><span style="color:rgb(192,192,192)"> </span><span style="color:rgb(85,255,255)">a</span><span style="color:rgb(192,192,192)"> </span><span style="color:rgb(85,255,255)">point</span></pre>
<pre style="margin-top:0px;margin-bottom:0px"><span style="color:rgb(192,192,192)"> </span>mx<span style="color:rgb(192,192,192)"> </span><span style="color:rgb(170,170,170)">=</span><span style="color:rgb(192,192,192)"> </span>vec<span style="color:rgb(170,170,170)">[</span>i<span style="color:rgb(170,170,170)">];</span></pre>
<pre style="margin-top:0px;margin-bottom:0px"><span style="color:rgb(192,192,192)"> </span>my<span style="color:rgb(192,192,192)"> </span><span style="color:rgb(170,170,170)">=</span><span style="color:rgb(192,192,192)"> </span>vec<span style="color:rgb(170,170,170)">[</span>i<span style="color:rgb(170,170,170)">+</span><span style="color:rgb(255,85,255)">1</span><span style="color:rgb(170,170,170)">];</span></pre>
<pre style="margin-top:0px;margin-bottom:0px"><span style="color:rgb(192,192,192)"> </span><span style="color:rgb(255,255,85)">int</span><span style="color:rgb(192,192,192)"> </span>x1<span style="color:rgb(192,192,192)"> </span><span style="color:rgb(170,170,170)">=</span><span style="color:rgb(192,192,192)"> </span>mx<span style="color:rgb(192,192,192)"> </span><span style="color:rgb(170,170,170)">-</span><span style="color:rgb(192,192,192)"> </span>radius<span style="color:rgb(170,170,170)">;</span></pre>
<pre style="margin-top:0px;margin-bottom:0px"><span style="color:rgb(192,192,192)"> </span><span style="color:rgb(255,255,85)">int</span><span style="color:rgb(192,192,192)"> </span>x2<span style="color:rgb(192,192,192)"> </span><span style="color:rgb(170,170,170)">=</span><span style="color:rgb(192,192,192)"> </span>mx<span style="color:rgb(192,192,192)"> </span><span style="color:rgb(170,170,170)">+</span><span style="color:rgb(192,192,192)"> </span>radius<span style="color:rgb(170,170,170)">;</span></pre>
<pre style="margin-top:0px;margin-bottom:0px"><span style="color:rgb(192,192,192)"> </span><span style="color:rgb(255,255,85)">int</span><span style="color:rgb(192,192,192)"> </span>y1<span style="color:rgb(192,192,192)"> </span><span style="color:rgb(170,170,170)">=</span><span style="color:rgb(192,192,192)"> </span>my<span style="color:rgb(192,192,192)"> </span><span style="color:rgb(170,170,170)">-</span><span style="color:rgb(192,192,192)"> </span>radius<span style="color:rgb(170,170,170)">;</span></pre>
<pre style="margin-top:0px;margin-bottom:0px"><span style="color:rgb(192,192,192)"> </span><span style="color:rgb(255,255,85)">int</span><span style="color:rgb(192,192,192)"> </span>y2<span style="color:rgb(192,192,192)"> </span><span style="color:rgb(170,170,170)">=</span><span style="color:rgb(192,192,192)"> </span>my<span style="color:rgb(192,192,192)"> </span><span style="color:rgb(170,170,170)">+</span><span style="color:rgb(192,192,192)"> </span>radius<span style="color:rgb(170,170,170)">;</span></pre>
<pre style="margin-top:0px;margin-bottom:0px"><br></pre>
<pre style="margin-top:0px;margin-bottom:0px"><span style="color:rgb(192,192,192)"> </span><span style="color:rgb(255,255,85)">double</span><span style="color:rgb(192,192,192)"> </span>inc<span style="color:rgb(192,192,192)"> </span><span style="color:rgb(170,170,170)">=</span><span style="color:rgb(192,192,192)"> </span><span style="color:rgb(255,85,255)">1</span><span style="color:rgb(170,170,170)">;</span></pre>
<pre style="margin-top:0px;margin-bottom:0px"><span style="color:rgb(192,192,192)"> </span><span style="color:rgb(255,255,85)">for</span><span style="color:rgb(192,192,192)"> </span><span style="color:rgb(170,170,170)">(</span><span style="color:rgb(255,255,85)">int</span><span style="color:rgb(192,192,192)"> </span>_x<span style="color:rgb(192,192,192)"> </span><span style="color:rgb(170,170,170)">=</span><span style="color:rgb(192,192,192)"> </span>x1<span style="color:rgb(170,170,170)">,</span><span style="color:rgb(192,192,192)"> </span>deltax<span style="color:rgb(192,192,192)"> </span><span style="color:rgb(170,170,170)">=</span><span style="color:rgb(192,192,192)"> </span><span style="color:rgb(170,170,170)">-</span>radius<span style="color:rgb(170,170,170)">;</span><span style="color:rgb(192,192,192)"> </span>_x<span style="color:rgb(192,192,192)"> </span><span style="color:rgb(170,170,170)"><=</span><span style="color:rgb(192,192,192)"> </span>x2<span style="color:rgb(170,170,170)">;</span><span style="color:rgb(192,192,192)"> </span>_x<span style="color:rgb(170,170,170)">+=</span>inc<span style="color:rgb(170,170,170)">,</span><span style="color:rgb(192,192,192)"> </span>deltax<span style="color:rgb(170,170,170)">+=</span>inc<span style="color:rgb(170,170,170)">)</span></pre>
<pre style="margin-top:0px;margin-bottom:0px"><span style="color:rgb(192,192,192)"> </span><span style="color:rgb(170,170,170)">{</span></pre>
<pre style="margin-top:0px;margin-bottom:0px"><span style="color:rgb(192,192,192)"> </span><span style="color:rgb(255,255,85)">for</span><span style="color:rgb(192,192,192)"> </span><span style="color:rgb(170,170,170)">(</span><span style="color:rgb(255,255,85)">int</span><span style="color:rgb(192,192,192)"> </span>_y<span style="color:rgb(192,192,192)"> </span><span style="color:rgb(170,170,170)">=</span><span style="color:rgb(192,192,192)"> </span>y1<span style="color:rgb(170,170,170)">,</span><span style="color:rgb(192,192,192)"> </span>deltay<span style="color:rgb(192,192,192)"> </span><span style="color:rgb(170,170,170)">=</span><span style="color:rgb(192,192,192)"> </span><span style="color:rgb(170,170,170)">-</span>radius<span style="color:rgb(170,170,170)">;</span><span style="color:rgb(192,192,192)"> </span>_y<span style="color:rgb(192,192,192)"> </span><span style="color:rgb(170,170,170)"><=</span><span style="color:rgb(192,192,192)"> </span>y2<span style="color:rgb(170,170,170)">;</span><span style="color:rgb(192,192,192)"> </span>_y<span style="color:rgb(170,170,170)">+=</span>inc<span style="color:rgb(170,170,170)">,</span><span style="color:rgb(192,192,192)"> </span>deltay<span style="color:rgb(170,170,170)">+=</span>inc<span style="color:rgb(170,170,170)">)</span></pre>
<pre style="margin-top:0px;margin-bottom:0px"><span style="color:rgb(192,192,192)"> </span><span style="color:rgb(170,170,170)">{</span></pre>
<pre style="margin-top:0px;margin-bottom:0px"><span style="color:rgb(192,192,192)"> </span><span style="color:rgb(255,255,85)">float</span><span style="color:rgb(192,192,192)"> </span>dist<span style="color:rgb(192,192,192)"> </span><span style="color:rgb(170,170,170)">=</span><span style="color:rgb(192,192,192)"> </span>sqrtf<span style="color:rgb(170,170,170)">(</span>deltax<span style="color:rgb(170,170,170)">*</span>deltax<span style="color:rgb(192,192,192)"> </span><span style="color:rgb(170,170,170)">+</span><span style="color:rgb(192,192,192)"> </span>deltay<span style="color:rgb(170,170,170)">*</span>deltay<span style="color:rgb(170,170,170)">);</span></pre>
<pre style="margin-top:0px;margin-bottom:0px"><span style="color:rgb(192,192,192)"> </span><span style="color:rgb(255,255,85)">if</span><span style="color:rgb(192,192,192)"> </span><span style="color:rgb(170,170,170)">(</span>dist<span style="color:rgb(170,170,170)"><</span>radius<span style="color:rgb(170,170,170)">)</span><span style="color:rgb(192,192,192)"> </span><span style="color:rgb(170,170,170)">{</span></pre>
<pre style="margin-top:0px;margin-bottom:0px"><span style="color:rgb(192,192,192)"> </span>painter<span style="color:rgb(170,170,170)">.</span>drawPoint<span style="color:rgb(170,170,170)">(</span>_x<span style="color:rgb(170,170,170)">,</span>_y<span style="color:rgb(170,170,170)">);</span></pre>
<pre style="margin-top:0px;margin-bottom:0px"><span style="color:rgb(192,192,192)"> </span><span style="color:rgb(170,170,170)">}</span></pre>
<pre style="margin-top:0px;margin-bottom:0px"><span style="color:rgb(192,192,192)"> </span><span style="color:rgb(170,170,170)">}</span></pre>
<pre style="margin-top:0px;margin-bottom:0px"><span style="color:rgb(192,192,192)"> </span><span style="color:rgb(170,170,170)">}</span></pre>
<pre style="margin-top:0px;margin-bottom:0px"><span style="color:rgb(192,192,192)"> </span><span style="color:rgb(170,170,170)">}</span></pre>
<pre style="margin-top:0px;margin-bottom:0px"><span style="color:rgb(192,192,192)"> </span><span style="color:rgb(170,170,170)">}</span></pre>
<pre style="margin-top:0px;margin-bottom:0px"><span style="color:rgb(192,192,192)"> </span><span style="color:rgb(85,255,85)">QVTKWidget</span><span style="color:rgb(170,170,170)">::</span><span style="font-style:italic">paintEvent</span><span style="color:rgb(170,170,170)">(</span>event<span style="color:rgb(170,170,170)">);</span></pre>
<pre style="margin-top:0px;margin-bottom:0px"><span style="color:rgb(170,170,170)">}</span></pre>
<pre style="margin-top:0px;margin-bottom:0px"><br></pre>
<pre style="margin-top:0px;margin-bottom:0px"><span style="color:rgb(255,255,85)">void</span><span style="color:rgb(192,192,192)"> </span><span style="color:rgb(85,255,85)">MyWidget</span><span style="color:rgb(170,170,170)">::</span><span style="font-style:italic">mousePressEvent</span><span style="color:rgb(170,170,170)">(</span><span style="color:rgb(85,255,85)">QMouseEvent</span><span style="color:rgb(192,192,192)"> </span><span style="color:rgb(170,170,170)">*</span>event<span style="color:rgb(170,170,170)">)</span></pre>
<pre style="margin-top:0px;margin-bottom:0px"><span style="color:rgb(170,170,170)">{</span></pre>
<pre style="margin-top:0px;margin-bottom:0px"><span style="color:rgb(192,192,192)"> </span>x<span style="color:rgb(170,170,170)">=</span>event<span style="color:rgb(170,170,170)">-></span>x<span style="color:rgb(170,170,170)">();</span></pre>
<pre style="margin-top:0px;margin-bottom:0px"><span style="color:rgb(192,192,192)"> </span>y<span style="color:rgb(170,170,170)">=</span>event<span style="color:rgb(170,170,170)">-></span>y<span style="color:rgb(170,170,170)">();</span></pre>
<pre style="margin-top:0px;margin-bottom:0px"><span style="color:rgb(192,192,192)"> </span>m_pressed<span style="color:rgb(192,192,192)"> </span><span style="color:rgb(170,170,170)">=</span><span style="color:rgb(192,192,192)"> </span><span style="color:rgb(255,255,85)">true</span><span style="color:rgb(170,170,170)">;</span></pre>
<pre style="margin-top:0px;margin-bottom:0px"><span style="color:rgb(192,192,192)"> </span><span style="color:rgb(85,255,85)">QVTKWidget</span><span style="color:rgb(170,170,170)">::</span><span style="font-style:italic">mousePressEvent</span><span style="color:rgb(170,170,170)">(</span>event<span style="color:rgb(170,170,170)">);</span></pre>
<pre style="margin-top:0px;margin-bottom:0px"><span style="color:rgb(170,170,170)">}</span></pre>
<pre style="margin-top:0px;margin-bottom:0px"><br></pre>
<pre style="margin-top:0px;margin-bottom:0px"><span style="color:rgb(255,255,85)">void</span><span style="color:rgb(192,192,192)"> </span><span style="color:rgb(85,255,85)">MyWidget</span><span style="color:rgb(170,170,170)">::</span><span style="font-style:italic">mouseReleaseEvent</span><span style="color:rgb(170,170,170)">(</span><span style="color:rgb(85,255,85)">QMouseEvent</span><span style="color:rgb(192,192,192)"> </span><span style="color:rgb(170,170,170)">*</span>event<span style="color:rgb(170,170,170)">)</span></pre>
<pre style="margin-top:0px;margin-bottom:0px"><span style="color:rgb(170,170,170)">{</span></pre>
<pre style="margin-top:0px;margin-bottom:0px"><span style="color:rgb(192,192,192)"> </span>x<span style="color:rgb(170,170,170)">=</span>event<span style="color:rgb(170,170,170)">-></span>x<span style="color:rgb(170,170,170)">();</span></pre>
<pre style="margin-top:0px;margin-bottom:0px"><span style="color:rgb(192,192,192)"> </span>y<span style="color:rgb(170,170,170)">=</span>event<span style="color:rgb(170,170,170)">-></span>y<span style="color:rgb(170,170,170)">();</span></pre>
<pre style="margin-top:0px;margin-bottom:0px"><span style="color:rgb(192,192,192)"> </span>vec<span style="color:rgb(170,170,170)">.</span>clear<span style="color:rgb(170,170,170)">();</span></pre>
<pre style="margin-top:0px;margin-bottom:0px"><span style="color:rgb(192,192,192)"> </span>update<span style="color:rgb(170,170,170)">();</span></pre>
<pre style="margin-top:0px;margin-bottom:0px"><span style="color:rgb(192,192,192)"> </span>m_pressed<span style="color:rgb(192,192,192)"> </span><span style="color:rgb(170,170,170)">=</span><span style="color:rgb(192,192,192)"> </span><span style="color:rgb(255,255,85)">false</span><span style="color:rgb(170,170,170)">;</span></pre>
<pre style="margin-top:0px;margin-bottom:0px"><span style="color:rgb(192,192,192)"> </span><span style="color:rgb(85,255,85)">QVTKWidget</span><span style="color:rgb(170,170,170)">::</span><span style="font-style:italic">mouseReleaseEvent</span><span style="color:rgb(170,170,170)">(</span>event<span style="color:rgb(170,170,170)">);</span></pre>
<pre style="margin-top:0px;margin-bottom:0px"><span style="color:rgb(170,170,170)">}</span></pre>
<pre style="margin-top:0px;margin-bottom:0px"><br></pre>
<pre style="margin-top:0px;margin-bottom:0px"><span style="color:rgb(255,255,85)">void</span><span style="color:rgb(192,192,192)"> </span><span style="color:rgb(85,255,85)">MyWidget</span><span style="color:rgb(170,170,170)">::</span><span style="font-style:italic">mouseMoveEvent</span><span style="color:rgb(170,170,170)">(</span><span style="color:rgb(85,255,85)">QMouseEvent</span><span style="color:rgb(192,192,192)"> </span><span style="color:rgb(170,170,170)">*</span>event<span style="color:rgb(170,170,170)">)</span></pre>
<pre style="margin-top:0px;margin-bottom:0px"><span style="color:rgb(170,170,170)">{</span></pre>
<pre style="margin-top:0px;margin-bottom:0px"><span style="color:rgb(192,192,192)"> </span><span style="color:rgb(255,255,85)">if</span><span style="color:rgb(192,192,192)"> </span><span style="color:rgb(170,170,170)">(</span>m_pressed<span style="color:rgb(170,170,170)">)</span><span style="color:rgb(192,192,192)"> </span><span style="color:rgb(170,170,170)">{</span></pre>
<pre style="margin-top:0px;margin-bottom:0px"><span style="color:rgb(192,192,192)"> </span>x<span style="color:rgb(170,170,170)">=</span>event<span style="color:rgb(170,170,170)">-></span>x<span style="color:rgb(170,170,170)">();</span></pre>
<pre style="margin-top:0px;margin-bottom:0px"><span style="color:rgb(192,192,192)"> </span>y<span style="color:rgb(170,170,170)">=</span>event<span style="color:rgb(170,170,170)">-></span>y<span style="color:rgb(170,170,170)">();</span></pre>
<pre style="margin-top:0px;margin-bottom:0px"><span style="color:rgb(192,192,192)"> </span>vec<span style="color:rgb(170,170,170)">.</span>push_back<span style="color:rgb(170,170,170)">(</span>x<span style="color:rgb(170,170,170)">);</span></pre>
<pre style="margin-top:0px;margin-bottom:0px"><span style="color:rgb(192,192,192)"> </span>vec<span style="color:rgb(170,170,170)">.</span>push_back<span style="color:rgb(170,170,170)">(</span>y<span style="color:rgb(170,170,170)">);</span></pre>
<pre style="margin-top:0px;margin-bottom:0px"><span style="color:rgb(192,192,192)"> </span>update<span style="color:rgb(170,170,170)">();</span></pre>
<pre style="margin-top:0px;margin-bottom:0px"><span style="color:rgb(192,192,192)"> </span><span style="color:rgb(170,170,170)">}</span></pre>
<pre style="margin-top:0px;margin-bottom:0px"><span style="color:rgb(192,192,192)"> </span><span style="color:rgb(85,255,85)">QVTKWidget</span><span style="color:rgb(170,170,170)">::</span><span style="font-style:italic">mouseMoveEvent</span><span style="color:rgb(170,170,170)">(</span>event<span style="color:rgb(170,170,170)">);</span></pre>
<pre style="margin-top:0px;margin-bottom:0px"><span style="color:rgb(170,170,170)">}</span></pre>
<pre style="margin-top:0px;margin-bottom:0px"><br></pre><div><br></div>-- <br><div class="gmail_signature"><div dir="ltr">thanks & regards,<div>Girish</div><div><br></div></div></div>
</div></div>
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