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QImage * | correctImageTilt (QString filename, QPoint p1, QPoint p2, StatusWidget *status) |
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Definition at line 100 of file tilt.cpp. References bottomRight, editedImage, findTwoLineIntersection(), StatusWidget::incrementProgress(), interpolatedPixelValue(), newProgress, StatusWidget::setStatus(), StatusWidget::showProgressBar(), status, topLeft, updateIncrement, DPoint::x(), and DPoint::y(). Referenced by EditingInterface::finishCorrectTilt(). 00102 { 00103 //first compute distance between two points or "radius" 00104 int dx = p2.x() - p1.x(); 00105 int dy = p2.y() - p1.y(); 00106 00107 //determine tilt angle 00108 int delta = 0; 00109 00110 //compute recirpocal of distance between points 00111 double recip_r = 1.0 / sqrt( (double) (dx*dx + dy*dy) ); 00112 00113 //compute angle with horizontal axis 00114 if( QABS(dx) > QABS(dy) ) 00115 { 00116 delta = dy; 00117 if(dx > 0) delta = -delta; 00118 } 00119 //compute angle with vertical axis 00120 else 00121 { 00122 delta = dx; 00123 if(dy < 0) delta = -delta; 00124 } 00125 00126 double sinTheta = (delta * recip_r); 00127 double theta = asin( sinTheta ); 00128 double cosTheta = cos( theta ); 00129 00130 //if angle is 0 (improbable but possible) then quit now 00131 if( theta == 0 ) 00132 return NULL; 00133 00134 //load original and edited images 00135 QImage originalImage( filename ); 00136 QImage rotatedImage( originalImage.width(), originalImage.height(), originalImage.depth() ); 00137 00138 //setup progress bar 00139 QString statusMessage = qApp->translate( "correctImageTilt", "Correcting Tilt:" ); 00140 status->showProgressBar( statusMessage, 200 ); 00141 qApp->processEvents(); 00142 00143 //during the first phase update the status bar for every 1% of image pixels that are processed 00144 int updateIncrement = (int) ( 0.01 * originalImage.width() * originalImage.height() ); 00145 int newProgress = 0; 00146 00147 //set each pixel to the rotated value 00148 double xp, yp; 00149 00150 double w2 = 0.5 * rotatedImage.width(); 00151 double h2 = 0.5 * rotatedImage.height(); 00152 00153 int x,y; 00154 uchar* scanLine; 00155 QRgb* rgb; 00156 for( y=0; y<rotatedImage.height(); y++) 00157 { 00158 //iterate over each selected pixel in scanline 00159 scanLine = rotatedImage.scanLine(y); 00160 for( x=0; x<rotatedImage.width(); x++) 00161 { 00162 //compute unrotated coordinates 00163 xp = cosTheta*(x-w2) + sinTheta*(y-h2) + w2; 00164 yp = -sinTheta*(x-w2) + cosTheta*(y-h2) + h2; 00165 00166 //set unrotated value 00167 rgb = ((QRgb*)scanLine+x); 00168 *rgb = interpolatedPixelValue( xp, yp, &originalImage); 00169 00170 //update status bar if significant progress has been made since last update 00171 newProgress++; 00172 if(newProgress >= updateIncrement) 00173 { 00174 newProgress = 0; 00175 status->incrementProgress(); 00176 qApp->processEvents(); 00177 } 00178 00179 } 00180 } 00181 00182 //find rotated corners 00183 double nTheta = -theta; 00184 double sinNTheta = sin( nTheta ); 00185 double cosNTheta = cos( nTheta ); 00186 00187 DPoint topLeft = DPoint( cosNTheta*(-w2) + sinNTheta*(-h2) + w2, 00188 -sinNTheta*(-w2) + cosNTheta*(-h2) + h2 ); 00189 00190 DPoint topRight = DPoint( cosNTheta*(w2) + sinNTheta*(-h2) + w2, 00191 -sinNTheta*(w2) + cosNTheta*(-h2) + h2 ); 00192 00193 DPoint bottomLeft = DPoint( cosNTheta*(-w2) + sinNTheta*(h2) + w2, 00194 -sinNTheta*(-w2) + cosNTheta*(h2) + h2 ); 00195 00196 DPoint bottomRight = DPoint( cosNTheta*(w2) + sinNTheta*(h2) + w2, 00197 -sinNTheta*(w2) + cosNTheta*(h2) + h2 ); 00198 00199 //determine which of these points are which in their rotated form 00200 DPoint top, bottom, left, right; 00201 if( theta < 0 ) 00202 { 00203 top = topRight; 00204 bottom = bottomLeft; 00205 left = topLeft; 00206 right = bottomRight; 00207 } 00208 else 00209 { 00210 top = topLeft; 00211 bottom = bottomRight; 00212 left = bottomLeft; 00213 right = topRight; 00214 } 00215 00216 //construct true corners 00217 DPoint trueTopLeft ( 0, 0 ); 00218 DPoint trueTopRight ( rotatedImage.width()-1, 0 ); 00219 DPoint trueBottomLeft ( 0, rotatedImage.height()-1 ); 00220 DPoint trueBottomRight( rotatedImage.width()-1, rotatedImage.height()-1 ); 00221 00222 //find intersections with image boundary 00223 DPoint topEdgeL = findTwoLineIntersection( left, top, trueTopLeft, trueTopRight ); 00224 DPoint topEdgeR = findTwoLineIntersection( top, right, trueTopLeft, trueTopRight ); 00225 00226 DPoint bottomEdgeL = findTwoLineIntersection( left, bottom, trueBottomLeft, trueBottomRight ); 00227 DPoint bottomEdgeR = findTwoLineIntersection( bottom, right, trueBottomLeft, trueBottomRight ); 00228 00229 DPoint leftEdgeT = findTwoLineIntersection( left, top, trueTopLeft, trueBottomLeft ); 00230 DPoint leftEdgeB = findTwoLineIntersection( left, bottom, trueTopLeft, trueBottomLeft ); 00231 00232 DPoint rightEdgeT = findTwoLineIntersection( right, top, trueTopRight, trueBottomRight ); 00233 DPoint rightEdgeB = findTwoLineIntersection( right, bottom, trueTopRight, trueBottomRight ); 00234 00235 //shot rays out from image center to each true corner and find intersections with clipped corners 00236 DPoint center( (int)w2, (int)h2 ); 00237 DPoint safeTopLeft = findTwoLineIntersection( center, trueTopLeft, leftEdgeT, topEdgeL ); 00238 DPoint safeTopRight = findTwoLineIntersection( center, trueTopRight, rightEdgeT, topEdgeR ); 00239 DPoint safeBottomLeft = findTwoLineIntersection( center, trueBottomLeft, leftEdgeB, bottomEdgeL ); 00240 DPoint safeBottomRight = findTwoLineIntersection( center, trueBottomRight, rightEdgeB, bottomEdgeR ); 00241 00242 //find constrained area 00243 double minY = QMAX( safeTopLeft.y(), safeTopRight.y() ); 00244 double maxY = QMIN( safeBottomLeft.y(), safeBottomRight.y() ); 00245 00246 double minX = QMAX( safeTopLeft.x(), safeBottomLeft.x() ); 00247 double maxX = QMIN( safeTopRight.x(), safeBottomRight.x() ); 00248 00249 //find contrained area in integer coordinates. this is semi-tricky. 00250 //if the minimum values decimal porition is nonzero then increment by one 00251 // (eg 5.37 -> 6) 00252 int xMin = (int) minX; 00253 int xMax = (int) maxX; 00254 00255 int yMin = (int) minY; 00256 int yMax = (int) maxY; 00257 00258 if( xMin < minX ) xMin++; 00259 if( yMin < minY ) yMin++; 00260 00261 //construct cropped rotated image 00262 QImage* editedImage = new QImage( xMax - xMin + 1, 00263 yMax - yMin + 1, 00264 rotatedImage.depth() ); 00265 00266 //during the second phase update the status bar for every 1% of cropped pixels that are procesed 00267 updateIncrement = (int) ( 0.01 * editedImage->width() * editedImage->height() ); 00268 newProgress = 0; 00269 00270 int x2,y2; 00271 uchar* scanLine2; 00272 QRgb* rgb2; 00273 00274 y2 = 0; 00275 for( y=yMin; y<=yMax; y++, y2++) 00276 { 00277 //iterate over each selected pixel in scanline 00278 scanLine = rotatedImage.scanLine(y); 00279 scanLine2 = editedImage->scanLine(y2); 00280 00281 x2 = 0; 00282 for( x=xMin; x<=xMax; x++, x2++) 00283 { 00284 rgb = ((QRgb*)scanLine +x ); 00285 rgb2 = ((QRgb*)scanLine2+x2); 00286 *rgb2 = *rgb; 00287 00288 //update status bar if significant progress has been made since last update 00289 newProgress++; 00290 if(newProgress >= updateIncrement) 00291 { 00292 newProgress = 0; 00293 status->incrementProgress(); 00294 qApp->processEvents(); 00295 } 00296 00297 } 00298 } 00299 00300 //remove status bar 00301 status->setStatus( "" ); 00302 qApp->processEvents(); 00303 00304 //return pointer to edited image 00305 return editedImage; 00306 }
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