qwt__symbol_8cpp-source.html

QWT5.01用于Qt开发的二维图形库程序

<a name="l00139"></a>00139         <span class="keywordflow">case</span> QwtSymbol::Cross:
<a name="l00140"></a>00140         {
<a name="l00141"></a>00141             <span class="keyword">const</span> <span class="keywordtype">int</span> w2 = r.width() / 2;
<a name="l00142"></a>00142             <span class="keyword">const</span> <span class="keywordtype">int</span> h2 = r.height() / 2;
<a name="l00143"></a>00143 
<a name="l00144"></a>00144             <a class="code" href="class_qwt_painter.html#f809f23704df7e05f51222daa296ca80">QwtPainter::drawLine</a>(painter, r.x() + w2, r.y(), 
<a name="l00145"></a>00145                 r.x() + w2, r.bottom());
<a name="l00146"></a>00146             <a class="code" href="class_qwt_painter.html#f809f23704df7e05f51222daa296ca80">QwtPainter::drawLine</a>(painter, r.x(), r.y() + h2, 
<a name="l00147"></a>00147                 r.right(), r.y() + h2);
<a name="l00148"></a>00148             <span class="keywordflow">break</span>;
<a name="l00149"></a>00149         }
<a name="l00150"></a>00150         <span class="keywordflow">case</span> QwtSymbol::XCross:
<a name="l00151"></a>00151         {
<a name="l00152"></a>00152             <a class="code" href="class_qwt_painter.html#f809f23704df7e05f51222daa296ca80">QwtPainter::drawLine</a>(painter, r.left(), r.top(), 
<a name="l00153"></a>00153                 r.right(), r.bottom());
<a name="l00154"></a>00154             <a class="code" href="class_qwt_painter.html#f809f23704df7e05f51222daa296ca80">QwtPainter::drawLine</a>(painter, r.left(), r.bottom(), 
<a name="l00155"></a>00155                 r.right(), r.top());
<a name="l00156"></a>00156             <span class="keywordflow">break</span>;
<a name="l00157"></a>00157         }
<a name="l00158"></a>00158         <span class="keywordflow">case</span> QwtSymbol::Triangle:
<a name="l00159"></a>00159         <span class="keywordflow">case</span> QwtSymbol::UTriangle:
<a name="l00160"></a>00160         {
<a name="l00161"></a>00161             <span class="keyword">const</span> <span class="keywordtype">int</span> w2 = r.width() / 2;
<a name="l00162"></a>00162 
<a name="l00163"></a>00163             QwtPolygon pa(3);
<a name="l00164"></a>00164             pa.setPoint(0, r.x() + w2, r.y());
<a name="l00165"></a>00165             pa.setPoint(1, r.right(), r.bottom());
<a name="l00166"></a>00166             pa.setPoint(2, r.x(), r.bottom());
<a name="l00167"></a>00167             <a class="code" href="class_qwt_painter.html#ea6a68bdfab18525b39f18413fc41950">QwtPainter::drawPolygon</a>(painter, pa);
<a name="l00168"></a>00168             <span class="keywordflow">break</span>;
<a name="l00169"></a>00169         }
<a name="l00170"></a>00170         <span class="keywordflow">case</span> QwtSymbol::DTriangle:
<a name="l00171"></a>00171         {
<a name="l00172"></a>00172             <span class="keyword">const</span> <span class="keywordtype">int</span> w2 = r.width() / 2;
<a name="l00173"></a>00173 
<a name="l00174"></a>00174             QwtPolygon pa(3);
<a name="l00175"></a>00175             pa.setPoint(0, r.x(), r.y());
<a name="l00176"></a>00176             pa.setPoint(1, r.right(), r.y());
<a name="l00177"></a>00177             pa.setPoint(2, r.x() + w2, r.bottom());
<a name="l00178"></a>00178             <a class="code" href="class_qwt_painter.html#ea6a68bdfab18525b39f18413fc41950">QwtPainter::drawPolygon</a>(painter, pa);
<a name="l00179"></a>00179             <span class="keywordflow">break</span>;
<a name="l00180"></a>00180         }
<a name="l00181"></a>00181         <span class="keywordflow">case</span> QwtSymbol::RTriangle:
<a name="l00182"></a>00182         {
<a name="l00183"></a>00183             <span class="keyword">const</span> <span class="keywordtype">int</span> h2 = r.height() / 2;
<a name="l00184"></a>00184 
<a name="l00185"></a>00185             QwtPolygon pa(3);
<a name="l00186"></a>00186             pa.setPoint(0, r.x(), r.y());
<a name="l00187"></a>00187             pa.setPoint(1, r.right(), r.y() + h2);
<a name="l00188"></a>00188             pa.setPoint(2, r.x(), r.bottom());
<a name="l00189"></a>00189             <a class="code" href="class_qwt_painter.html#ea6a68bdfab18525b39f18413fc41950">QwtPainter::drawPolygon</a>(painter, pa);
<a name="l00190"></a>00190             <span class="keywordflow">break</span>;
<a name="l00191"></a>00191         }
<a name="l00192"></a>00192         <span class="keywordflow">case</span> QwtSymbol::LTriangle:
<a name="l00193"></a>00193         {
<a name="l00194"></a>00194             <span class="keyword">const</span> <span class="keywordtype">int</span> h2 = r.height() / 2;
<a name="l00195"></a>00195 
<a name="l00196"></a>00196             QwtPolygon pa(3);
<a name="l00197"></a>00197             pa.setPoint(0, r.right(), r.y());
<a name="l00198"></a>00198             pa.setPoint(1, r.x(), r.y() + h2);
<a name="l00199"></a>00199             pa.setPoint(2, r.right(), r.bottom());
<a name="l00200"></a>00200             <a class="code" href="class_qwt_painter.html#ea6a68bdfab18525b39f18413fc41950">QwtPainter::drawPolygon</a>(painter, pa);
<a name="l00201"></a>00201             <span class="keywordflow">break</span>;
<a name="l00202"></a>00202         }
<a name="l00203"></a>00203         <span class="keywordflow">case</span> QwtSymbol::HLine:
<a name="l00204"></a>00204         {
<a name="l00205"></a>00205             <span class="keyword">const</span> <span class="keywordtype">int</span> h2 = r.height() / 2;
<a name="l00206"></a>00206             <a class="code" href="class_qwt_painter.html#f809f23704df7e05f51222daa296ca80">QwtPainter::drawLine</a>(painter, r.left(), r.top() + h2,
<a name="l00207"></a>00207                     r.right(), r.top() + h2);
<a name="l00208"></a>00208             <span class="keywordflow">break</span>;
<a name="l00209"></a>00209         }
<a name="l00210"></a>00210         <span class="keywordflow">case</span> QwtSymbol::VLine:
<a name="l00211"></a>00211         {
<a name="l00212"></a>00212             <span class="keyword">const</span> <span class="keywordtype">int</span> w2 = r.width() / 2;
<a name="l00213"></a>00213             <a class="code" href="class_qwt_painter.html#f809f23704df7e05f51222daa296ca80">QwtPainter::drawLine</a>(painter, r.left() + w2, r.top(),
<a name="l00214"></a>00214                     r.left() + w2, r.bottom());
<a name="l00215"></a>00215             <span class="keywordflow">break</span>;
<a name="l00216"></a>00216         }
<a name="l00217"></a>00217         <span class="keywordflow">case</span> QwtSymbol::Star1:
<a name="l00218"></a>00218         {
<a name="l00219"></a>00219             <span class="keyword">const</span> <span class="keywordtype">double</span> sqrt1_2 = 0.70710678118654752440; <span class="comment">/* 1/sqrt(2) */</span>
<a name="l00220"></a>00220 
<a name="l00221"></a>00221             <span class="keyword">const</span> <span class="keywordtype">int</span> w2 = r.width() / 2;
<a name="l00222"></a>00222             <span class="keyword">const</span> <span class="keywordtype">int</span> h2 = r.height() / 2;
<a name="l00223"></a>00223             <span class="keyword">const</span> <span class="keywordtype">int</span> d1  = (int)( (<span class="keywordtype">double</span>)w2 * (1.0 - sqrt1_2) );
<a name="l00224"></a>00224 
<a name="l00225"></a>00225             <a class="code" href="class_qwt_painter.html#f809f23704df7e05f51222daa296ca80">QwtPainter::drawLine</a>(painter, r.left() + d1, r.top() + d1,
<a name="l00226"></a>00226                     r.right() - d1, r.bottom() - d1);
<a name="l00227"></a>00227             <a class="code" href="class_qwt_painter.html#f809f23704df7e05f51222daa296ca80">QwtPainter::drawLine</a>(painter, r.left() + d1, r.bottom() - d1,
<a name="l00228"></a>00228                     r.right() - d1, r.top() + d1);
<a name="l00229"></a>00229             <a class="code" href="class_qwt_painter.html#f809f23704df7e05f51222daa296ca80">QwtPainter::drawLine</a>(painter, r.left() + w2, r.top(),
<a name="l00230"></a>00230                     r.left() + w2, r.bottom());
<a name="l00231"></a>00231             <a class="code" href="class_qwt_painter.html#f809f23704df7e05f51222daa296ca80">QwtPainter::drawLine</a>(painter, r.left(), r.top() + h2,
<a name="l00232"></a>00232                     r.right(), r.top() + h2);
<a name="l00233"></a>00233             <span class="keywordflow">break</span>;
<a name="l00234"></a>00234         }
<a name="l00235"></a>00235         <span class="keywordflow">case</span> QwtSymbol::Star2:
<a name="l00236"></a>00236         {
<a name="l00237"></a>00237             <span class="keyword">const</span> <span class="keywordtype">int</span> w = r.width();
<a name="l00238"></a>00238             <span class="keyword">const</span> <span class="keywordtype">int</span> side = (int)(((<span class="keywordtype">double</span>)r.width() * (1.0 - 0.866025)) /
<a name="l00239"></a>00239                 2.0);  <span class="comment">// 0.866025 = cos(30