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Classes | |
| class | DPoint |
Functions | |
| QRgb | interpolatedPixelValue (double xp, double yp, QImage *image) |
| QRgb | blendColors (QRgb color1, QRgb color2, double alpha) |
| DPoint | findTwoLineIntersection (DPoint p1, DPoint p2, DPoint p3, DPoint p4) |
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Definition at line 359 of file tilt.cpp. Referenced by interpolatedPixelValue(). 00360 {
00361 double alpha2 = 1.0-alpha;
00362 return qRgb( (int) QMAX( QMIN( 255, alpha2*qRed (color1) + alpha*qRed(color2) ), 0 ),
00363 (int) QMAX( QMIN( 255, alpha2*qGreen(color1) + alpha*qGreen(color2) ), 0 ),
00364 (int) QMAX( QMIN( 255, alpha2*qBlue (color1) + alpha*qBlue(color2) ), 0 ) );
00365 }
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Definition at line 367 of file tilt.cpp. References DPoint::x(), and DPoint::y(). Referenced by correctImageTilt(). 00369 {
00370 //----------------------------------------------
00371 //=== Case 1: neither line has a change in X ===
00372 //----------------------------------------------
00373 //If there is no change in x for both lines,
00374 //either lines will NEVER or ALWAYS intersect.
00375 if(p1.x() == p2.x() &&
00376 p4.x() == p3.x())
00377 {
00378 //Ok, if their x values are equal, return
00379 //intersection point as line A's point A.
00380 //Yes, this is a little arbitratry. But
00381 //theoreticaly this section of code will almost
00382 //never be executed.
00383 if( p1.x() == p3.x() )
00384 { return DPoint( p1.x(), p1.y() ); }
00385 //Else lines will never intersect,
00386 //return pair (-32000,-32000)
00387 else
00388 { return DPoint( -32000, -32000 ); }
00389 }
00390 //----------------------------------------------
00391 //Else, we know at least one of the lines
00392 //does NOT have a slope of infinity!!!
00393 //----------------------------------------------
00394
00395 //----------------------------------------------
00396 //=== Case 2: line A has no change in X ===
00397 //----------------------------------------------
00398 //If line A has an infinite slope (no change in x)
00399 //we know line B does not have an infinite slope...
00400 else if( p1.x() == p2.x() )
00401 {
00402 double slopeB = ((double) (p4.y() - p3.y()) ) / (p4.x() - p3.x());
00403
00404 double yInterceptB = p3.y() - slopeB*p3.x();
00405
00406 //y = mx+b
00407 return DPoint( p2.x(), slopeB*p2.x() + yInterceptB );
00408 }
00409 //----------------------------------------------
00410 //=== Case 3: line B has no change in X ===
00411 //----------------------------------------------
00412 //If line B has an infinite slope (no change in x)
00413 //we know line A does not have an infinite slope...
00414 else if( p4.x() == p3.x() )
00415 {
00416 double slopeA = ((double) (p2.y() - p1.y()) ) / (p2.x() - p1.x());
00417
00418 double yInterceptA = p1.y() - slopeA*p1.x();
00419
00420 //y = mx+b
00421 return DPoint( p4.x(), slopeA*p4.x() + yInterceptA );
00422 }
00423 //----------------------------------------------
00424 //=== Case 4: both lines have non infinite slopes ===
00425 //----------------------------------------------
00426 else
00427 {
00428 double slopeA = ((double) (p2.y() - p1.y()) ) / (p2.x() - p1.x());
00429 double slopeB = ((double) (p4.y() - p3.y()) ) / (p4.x() - p3.x());
00430 double yInterceptA = p1.y() - slopeA*p1.x();
00431 double yInterceptB = p3.y() - slopeB*p3.x();
00432
00433 //y1 = mx1+b
00434 //y2 = nx2+c
00435 //at intersection y1=y2 and x1 = x2 so...
00436 //mx +b = nx + c
00437 //x(m-n) = c-b
00438 //x = (c-b)/(m-n)
00439 //where m and n are slope and
00440 //b and c are y-intercepts.
00441 //x = (c-b)/(m-n)
00442 double x = (yInterceptB - yInterceptA) / (slopeA - slopeB);
00443 return DPoint( x, (slopeA * x) + yInterceptA );
00444 }
00445 }
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Definition at line 312 of file tilt.cpp. References blendColors(). Referenced by correctImageTilt(). 00314 {
00315 //do boundary checking to
00316 //ensure we don't read beyond image boundaries
00317 if(xp < 0 || xp >= image->width() ||
00318 yp < 0 || yp >= image->height() )
00319 return qRgb( 0, 0, 0 );
00320
00321 //get four pixel colors,
00322 int x = (int)xp;
00323 int y = (int)yp;
00324
00325 uchar* scanLine1 = image->scanLine( y );
00326
00327 uchar* scanLine2;
00328 if( y < image->height() - 1 )
00329 scanLine2 = image->scanLine( y+1 );
00330 else
00331 scanLine2 = scanLine1;
00332
00333 QRgb p1,p2,p3,p4;
00334
00335 p1 = *((QRgb*)scanLine1+x);
00336 p3 = *((QRgb*)scanLine2+x);
00337
00338 if( x < image->width() - 1)
00339 {
00340 p2 = *((QRgb*)scanLine1+x+1);
00341 p4 = *((QRgb*)scanLine2+x+1);
00342 }
00343 else
00344 {
00345 p2 = p1;
00346 p4 = p3;
00347 }
00348
00349 //blend four colors
00350 double alphaY = yp - y;
00351 double alphaX = xp - x;
00352
00353 p1 = blendColors( p1, p2, alphaX );
00354 p3 = blendColors( p3, p4, alphaX );
00355 p1 = blendColors( p1, p3, alphaY );
00356 return p1;
00357 }
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1.3.9.1