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<h1>tilt_internal.h File Reference</h1>
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This graph shows which files directly or indirectly include this file:</div>
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<a href="tilt__internal_8h_source.html">Go to the source code of this file.</a><table border="0" cellpadding="0" cellspacing="0">
<tr><td></td></tr>
<tr><td colspan="2"><br><h2>Classes</h2></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">class </td><td class="memItemRight" valign="bottom"><a class="el" href="classDPoint.html">DPoint</a></td></tr>
<tr><td colspan="2"><br><h2>Functions</h2></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">QRgb </td><td class="memItemRight" valign="bottom"><a class="el" href="tilt__internal_8h.html#3f1d83198a2abb32c2a9e8c7bfb4772e">interpolatedPixelValue</a> (double xp, double yp, QImage *image)</td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">QRgb </td><td class="memItemRight" valign="bottom"><a class="el" href="tilt__internal_8h.html#fff3aa2df7d0a8ed1d7f5929e34eed60">blendColors</a> (QRgb color1, QRgb color2, double alpha)</td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="el" href="classDPoint.html">DPoint</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="tilt__internal_8h.html#64cdd4694c2d057ef599ab1360ff62c1">findTwoLineIntersection</a> (<a class="el" href="classDPoint.html">DPoint</a> p1, <a class="el" href="classDPoint.html">DPoint</a> p2, <a class="el" href="classDPoint.html">DPoint</a> p3, <a class="el" href="classDPoint.html">DPoint</a> p4)</td></tr>
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<hr><h2>Function Documentation</h2>
<a class="anchor" name="fff3aa2df7d0a8ed1d7f5929e34eed60"></a><!-- doxytag: member="tilt_internal.h::blendColors" ref="fff3aa2df7d0a8ed1d7f5929e34eed60" args="(QRgb color1, QRgb color2, double alpha)" -->
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<div class="memproto">
<table class="memname">
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<td class="memname">QRgb blendColors </td>
<td>(</td>
<td class="paramtype">QRgb </td>
<td class="paramname"> <em>color1</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">QRgb </td>
<td class="paramname"> <em>color2</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">double </td>
<td class="paramname"> <em>alpha</em></td><td> </td>
</tr>
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<td></td>
<td>)</td>
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</tr>
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<div class="memdoc">
<p>
<p>Definition at line <a class="el" href="tilt_8cpp_source.html#l00359">359</a> of file <a class="el" href="tilt_8cpp_source.html">tilt.cpp</a>.</p>
<p>Referenced by <a class="el" href="tilt_8cpp_source.html#l00312">interpolatedPixelValue()</a>.</p>
<div class="fragment"><pre class="fragment"><a name="l00360"></a>00360 {
<a name="l00361"></a>00361 <span class="keywordtype">double</span> alpha2 = 1.0-alpha;
<a name="l00362"></a>00362 <span class="keywordflow">return</span> qRgb( (<span class="keywordtype">int</span>) QMAX( QMIN( 255, alpha2*qRed (color1) + alpha*qRed(color2) ), 0 ),
<a name="l00363"></a>00363 (<span class="keywordtype">int</span>) QMAX( QMIN( 255, alpha2*qGreen(color1) + alpha*qGreen(color2) ), 0 ),
<a name="l00364"></a>00364 (<span class="keywordtype">int</span>) QMAX( QMIN( 255, alpha2*qBlue (color1) + alpha*qBlue(color2) ), 0 ) );
<a name="l00365"></a>00365 }
</pre></div>
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<a class="anchor" name="64cdd4694c2d057ef599ab1360ff62c1"></a><!-- doxytag: member="tilt_internal.h::findTwoLineIntersection" ref="64cdd4694c2d057ef599ab1360ff62c1" args="(DPoint p1, DPoint p2, DPoint p3, DPoint p4)" -->
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<td class="memname"><a class="el" href="classDPoint.html">DPoint</a> findTwoLineIntersection </td>
<td>(</td>
<td class="paramtype"><a class="el" href="classDPoint.html">DPoint</a> </td>
<td class="paramname"> <em>p1</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="classDPoint.html">DPoint</a> </td>
<td class="paramname"> <em>p2</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="classDPoint.html">DPoint</a> </td>
<td class="paramname"> <em>p3</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="classDPoint.html">DPoint</a> </td>
<td class="paramname"> <em>p4</em></td><td> </td>
</tr>
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<td></td>
<td>)</td>
<td></td><td></td><td></td>
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<div class="memdoc">
<p>
<p>Definition at line <a class="el" href="tilt_8cpp_source.html#l00367">367</a> of file <a class="el" href="tilt_8cpp_source.html">tilt.cpp</a>.</p>
<p>References <a class="el" href="tilt_8cpp_source.html#l00456">DPoint::x()</a>, and <a class="el" href="tilt_8cpp_source.html#l00457">DPoint::y()</a>.</p>
<p>Referenced by <a class="el" href="tilt_8cpp_source.html#l00100">correctImageTilt()</a>.</p>
<div class="fragment"><pre class="fragment"><a name="l00369"></a>00369 {
<a name="l00370"></a>00370 <span class="comment">//----------------------------------------------</span>
<a name="l00371"></a>00371 <span class="comment">//=== Case 1: neither line has a change in X ===</span>
<a name="l00372"></a>00372 <span class="comment">//----------------------------------------------</span>
<a name="l00373"></a>00373 <span class="comment">//If there is no change in x for both lines, </span>
<a name="l00374"></a>00374 <span class="comment">//either lines will NEVER or ALWAYS intersect.</span>
<a name="l00375"></a>00375 <span class="keywordflow">if</span>(p1.<a class="code" href="classDPoint.html#77c659dcf610ea320fd46ab7bf338851">x</a>() == p2.<a class="code" href="classDPoint.html#77c659dcf610ea320fd46ab7bf338851">x</a>() &&
<a name="l00376"></a>00376 p4.<a class="code" href="classDPoint.html#77c659dcf610ea320fd46ab7bf338851">x</a>() == p3.<a class="code" href="classDPoint.html#77c659dcf610ea320fd46ab7bf338851">x</a>())
<a name="l00377"></a>00377 {
<a name="l00378"></a>00378 <span class="comment">//Ok, if their x values are equal, return </span>
<a name="l00379"></a>00379 <span class="comment">//intersection point as line A's point A.</span>
<a name="l00380"></a>00380 <span class="comment">//Yes, this is a little arbitratry. But </span>
<a name="l00381"></a>00381 <span class="comment">//theoreticaly this section of code will almost</span>
<a name="l00382"></a>00382 <span class="comment">//never be executed.</span>
<a name="l00383"></a>00383 <span class="keywordflow">if</span>( p1.<a class="code" href="classDPoint.html#77c659dcf610ea320fd46ab7bf338851">x</a>() == p3.<a class="code" href="classDPoint.html#77c659dcf610ea320fd46ab7bf338851">x</a>() )
<a name="l00384"></a>00384 { <span class="keywordflow">return</span> <a class="code" href="classDPoint.html">DPoint</a>( p1.<a class="code" href="classDPoint.html#77c659dcf610ea320fd46ab7bf338851">x</a>(), p1.<a class="code" href="classDPoint.html#fefa46a0d128b45349fe6b05526205ad">y</a>() ); }
<a name="l00385"></a>00385 <span class="comment">//Else lines will never intersect,</span>
<a name="l00386"></a>00386 <span class="comment">//return pair (-32000,-32000)</span>
<a name="l00387"></a>00387 <span class="keywordflow">else</span>
<a name="l00388"></a>00388 { <span class="keywordflow">return</span> <a class="code" href="classDPoint.html">DPoint</a>( -32000, -32000 ); }
<a name="l00389"></a>00389 }
<a name="l00390"></a>00390 <span class="comment">//----------------------------------------------</span>
<a name="l00391"></a>00391 <span class="comment">//Else, we know at least one of the lines </span>
<a name="l00392"></a>00392 <span class="comment">//does NOT have a slope of infinity!!!</span>
<a name="l00393"></a>00393 <span class="comment">//----------------------------------------------</span>
<a name="l00394"></a>00394
<a name="l00395"></a>00395 <span class="comment">//----------------------------------------------</span>
<a name="l00396"></a>00396 <span class="comment">//=== Case 2: line A has no change in X ===</span>
<a name="l00397"></a>00397 <span class="comment">//----------------------------------------------</span>
<a name="l00398"></a>00398 <span class="comment">//If line A has an infinite slope (no change in x)</span>
<a name="l00399"></a>00399 <span class="comment">//we know line B does not have an infinite slope...</span>
<a name="l00400"></a>00400 <span class="keywordflow">else</span> <span class="keywordflow">if</span>( p1.<a class="code" href="classDPoint.html#77c659dcf610ea320fd46ab7bf338851">x</a>() == p2.<a class="code" href="classDPoint.html#77c659dcf610ea320fd46ab7bf338851">x</a>() )
<a name="l00401"></a>00401 {
<a name="l00402"></a>00402 <span class="keywordtype">double</span> slopeB = ((double) (p4.<a class="code" href="classDPoint.html#fefa46a0d128b45349fe6b05526205ad">y</a>() - p3.<a class="code" href="classDPoint.html#fefa46a0d128b45349fe6b05526205ad">y</a>()) ) / (p4.<a class="code" href="classDPoint.html#77c659dcf610ea320fd46ab7bf338851">x</a>() - p3.<a class="code" href="classDPoint.html#77c659dcf610ea320fd46ab7bf338851">x</a>());
<a name="l00403"></a>00403
<a name="l00404"></a>00404 <span class="keywordtype">double</span> yInterceptB = p3.<a class="code" href="classDPoint.html#fefa46a0d128b45349fe6b05526205ad">y</a>() - slopeB*p3.<a class="code" href="classDPoint.html#77c659dcf610ea320fd46ab7bf338851">x</a>();
<a name="l00405"></a>00405
<a name="l00406"></a>00406 <span class="comment">//y = mx+b</span>
<a name="l00407"></a>00407 <span class="keywordflow">return</span> <a class="code" href="classDPoint.html">DPoint</a>( p2.<a class="code" href="classDPoint.html#77c659dcf610ea320fd46ab7bf338851">x</a>(), slopeB*p2.<a class="code" href="classDPoint.html#77c659dcf610ea320fd46ab7bf338851">x</a>() + yInterceptB );
<a name="l00408"></a>00408 }
<a name="l00409"></a>00409 <span class="comment">//----------------------------------------------</span>
<a name="l00410"></a>00410 <span class="comment">//=== Case 3: line B has no change in X ===</span>
<a name="l00411"></a>00411 <span class="comment">//----------------------------------------------</span>
<a name="l00412"></a>00412 <span class="comment">//If line B has an infinite slope (no change in x)</span>
<a name="l00413"></a>00413 <span class="comment">//we know line A does not have an infinite slope...</span>
<a name="l00414"></a>00414 <span class="keywordflow">else</span> <span class="keywordflow">if</span>( p4.<a class="code" href="classDPoint.html#77c659dcf610ea320fd46ab7bf338851">x</a>() == p3.<a class="code" href="classDPoint.html#77c659dcf610ea320fd46ab7bf338851">x</a>() )
<a name="l00415"></a>00415 {
<a name="l00416"></a>00416 <span class="keywordtype">double</span> slopeA = ((double) (p2.<a class="code" href="classDPoint.html#fefa46a0d128b45349fe6b05526205ad">y</a>() - p1.<a class="code" href="classDPoint.html#fefa46a0d128b45349fe6b05526205ad">y</a>()) ) / (p2.<a class="code" href="classDPoint.html#77c659dcf610ea320fd46ab7bf338851">x</a>() - p1.<a class="code" href="classDPoint.html#77c659dcf610ea320fd46ab7bf338851">x</a>());
<a name="l00417"></a>00417
<a name="l00418"></a>00418 <span class="keywordtype">double</span> yInterceptA = p1.<a class="code" href="classDPoint.html#fefa46a0d128b45349fe6b05526205ad">y</a>() - slopeA*p1.<a class="code" href="classDPoint.html#77c659dcf610ea320fd46ab7bf338851">x</a>();
<a name="l00419"></a>00419
<a name="l00420"></a>00420 <span class="comment">//y = mx+b</span>
<a name="l00421"></a>00421 <span class="keywordflow">return</span> <a class="code" href="classDPoint.html">DPoint</a>( p4.<a class="code" href="classDPoint.html#77c659dcf610ea320fd46ab7bf338851">x</a>(), slopeA*p4.<a class="code" href="classDPoint.html#77c659dcf610ea320fd46ab7bf338851">x</a>() + yInterceptA );
<a name="l00422"></a>00422 }
<a name="l00423"></a>00423 <span class="comment">//----------------------------------------------</span>
<a name="l00424"></a>00424 <span class="comment">//=== Case 4: both lines have non infinite slopes ===</span>
<a name="l00425"></a>00425 <span class="comment">//----------------------------------------------</span>
<a name="l00426"></a>00426 <span class="keywordflow">else</span>
<a name="l00427"></a>00427 {
<a name="l00428"></a>00428 <span class="keywordtype">double</span> slopeA = ((double) (p2.<a class="code" href="classDPoint.html#fefa46a0d128b45349fe6b05526205ad">y</a>() - p1.<a class="code" href="classDPoint.html#fefa46a0d128b45349fe6b05526205ad">y</a>()) ) / (p2.<a class="code" href="classDPoint.html#77c659dcf610ea320fd46ab7bf338851">x</a>() - p1.<a class="code" href="classDPoint.html#77c659dcf610ea320fd46ab7bf338851">x</a>());
<a name="l00429"></a>00429 <span class="keywordtype">double</span> slopeB = ((double) (p4.<a class="code" href="classDPoint.html#fefa46a0d128b45349fe6b05526205ad">y</a>() - p3.<a class="code" href="classDPoint.html#fefa46a0d128b45349fe6b05526205ad">y</a>()) ) / (p4.<a class="code" href="classDPoint.html#77c659dcf610ea320fd46ab7bf338851">x</a>() - p3.<a class="code" href="classDPoint.html#77c659dcf610ea320fd46ab7bf338851">x</a>());
<a name="l00430"></a>00430 <span class="keywordtype">double</span> yInterceptA = p1.<a class="code" href="classDPoint.html#fefa46a0d128b45349fe6b05526205ad">y</a>() - slopeA*p1.<a class="code" href="classDPoint.html#77c659dcf610ea320fd46ab7bf338851">x</a>();
<a name="l00431"></a>00431 <span class="keywordtype">double</span> yInterceptB = p3.<a class="code" href="classDPoint.html#fefa46a0d128b45349fe6b05526205ad">y</a>() - slopeB*p3.<a class="code" href="classDPoint.html#77c659dcf610ea320fd46ab7bf338851">x</a>();
<a name="l00432"></a>00432
<a name="l00433"></a>00433 <span class="comment">//y1 = mx1+b</span>
<a name="l00434"></a>00434 <span class="comment">//y2 = nx2+c</span>
<a name="l00435"></a>00435 <span class="comment">//at intersection y1=y2 and x1 = x2 so...</span>
<a name="l00436"></a>00436 <span class="comment">//mx +b = nx + c</span>
<a name="l00437"></a>00437 <span class="comment">//x(m-n) = c-b</span>
<a name="l00438"></a>00438 <span class="comment">//x = (c-b)/(m-n)</span>
<a name="l00439"></a>00439 <span class="comment">//where m and n are slope and</span>
<a name="l00440"></a>00440 <span class="comment">//b and c are y-intercepts.</span>
<a name="l00441"></a>00441 <span class="comment">//x = (c-b)/(m-n)</span>
<a name="l00442"></a>00442 <span class="keywordtype">double</span> x = (yInterceptB - yInterceptA) / (slopeA - slopeB);
<a name="l00443"></a>00443 <span class="keywordflow">return</span> <a class="code" href="classDPoint.html">DPoint</a>( x, (slopeA * x) + yInterceptA );
<a name="l00444"></a>00444 }
<a name="l00445"></a>00445 }
</pre></div>
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</div><p>
<a class="anchor" name="3f1d83198a2abb32c2a9e8c7bfb4772e"></a><!-- doxytag: member="tilt_internal.h::interpolatedPixelValue" ref="3f1d83198a2abb32c2a9e8c7bfb4772e" args="(double xp, double yp, QImage *image)" -->
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<div class="memproto">
<table class="memname">
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<td class="memname">QRgb interpolatedPixelValue </td>
<td>(</td>
<td class="paramtype">double </td>
<td class="paramname"> <em>xp</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">double </td>
<td class="paramname"> <em>yp</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">QImage * </td>
<td class="paramname"> <em>image</em></td><td> </td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td></td><td></td>
</tr>
</table>
</div>
<div class="memdoc">
<p>
<p>Definition at line <a class="el" href="tilt_8cpp_source.html#l00312">312</a> of file <a class="el" href="tilt_8cpp_source.html">tilt.cpp</a>.</p>
<p>References <a class="el" href="tilt_8cpp_source.html#l00359">blendColors()</a>, <a class="el" href="blur_8cpp_source.html#l00079">height</a>, and <a class="el" href="blur_8cpp_source.html#l00079">width</a>.</p>
<p>Referenced by <a class="el" href="tilt_8cpp_source.html#l00100">correctImageTilt()</a>.</p>
<div class="fragment"><pre class="fragment"><a name="l00314"></a>00314 {
<a name="l00315"></a>00315 <span class="comment">//do boundary checking to </span>
<a name="l00316"></a>00316 <span class="comment">//ensure we don't read beyond image boundaries</span>
<a name="l00317"></a>00317 <span class="keywordflow">if</span>(xp < 0 || xp >= image->width() ||
<a name="l00318"></a>00318 yp < 0 || yp >= image->height() )
<a name="l00319"></a>00319 <span class="keywordflow">return</span> qRgb( 0, 0, 0 );
<a name="l00320"></a>00320
<a name="l00321"></a>00321 <span class="comment">//get four pixel colors, </span>
<a name="l00322"></a>00322 <span class="keywordtype">int</span> x = (int)xp;
<a name="l00323"></a>00323 <span class="keywordtype">int</span> y = (int)yp;
<a name="l00324"></a>00324
<a name="l00325"></a>00325 uchar* scanLine1 = image->scanLine( y );
<a name="l00326"></a>00326
<a name="l00327"></a>00327 uchar* scanLine2;
<a name="l00328"></a>00328 <span class="keywordflow">if</span>( y < image-><a class="code" href="blur_8cpp.html#d12fc34ce789bce6c8a05d8a17138534">height</a>() - 1 )
<a name="l00329"></a>00329 scanLine2 = image->scanLine( y+1 );
<a name="l00330"></a>00330 <span class="keywordflow">else</span>
<a name="l00331"></a>00331 scanLine2 = scanLine1;
<a name="l00332"></a>00332
<a name="l00333"></a>00333 QRgb p1,p2,p3,p4;
<a name="l00334"></a>00334
<a name="l00335"></a>00335 p1 = *((QRgb*)scanLine1+x);
<a name="l00336"></a>00336 p3 = *((QRgb*)scanLine2+x);
<a name="l00337"></a>00337
<a name="l00338"></a>00338 <span class="keywordflow">if</span>( x < image-><a class="code" href="blur_8cpp.html#2474a5474cbff19523a51eb1de01cda4">width</a>() - 1)
<a name="l00339"></a>00339 {
<a name="l00340"></a>00340 p2 = *((QRgb*)scanLine1+x+1);
<a name="l00341"></a>00341 p4 = *((QRgb*)scanLine2+x+1);
<a name="l00342"></a>00342 }
<a name="l00343"></a>00343 <span class="keywordflow">else</span>
<a name="l00344"></a>00344 {
<a name="l00345"></a>00345 p2 = p1;
<a name="l00346"></a>00346 p4 = p3;
<a name="l00347"></a>00347 }
<a name="l00348"></a>00348
<a name="l00349"></a>00349 <span class="comment">//blend four colors</span>
<a name="l00350"></a>00350 <span class="keywordtype">double</span> alphaY = yp - y;
<a name="l00351"></a>00351 <span class="keywordtype">double</span> alphaX = xp - x;
<a name="l00352"></a>00352
<a name="l00353"></a>00353 p1 = <a class="code" href="tilt_8cpp.html#fff3aa2df7d0a8ed1d7f5929e34eed60">blendColors</a>( p1, p2, alphaX );
<a name="l00354"></a>00354 p3 = <a class="code" href="tilt_8cpp.html#fff3aa2df7d0a8ed1d7f5929e34eed60">blendColors</a>( p3, p4, alphaX );
<a name="l00355"></a>00355 p1 = <a class="code" href="tilt_8cpp.html#fff3aa2df7d0a8ed1d7f5929e34eed60">blendColors</a>( p1, p3, alphaY );
<a name="l00356"></a>00356 <span class="keywordflow">return</span> p1;
<a name="l00357"></a>00357 }
</pre></div>
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distrib
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Mandriva
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2010.0
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i586
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media
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contrib-release
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by-pkgid
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4f45e7bdfd4a5ff17f5f8eaab90d017f
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files
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1714
