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#include "Page.h" // Inclou pam.h
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#include "Bitmap.h"
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#include <stdio.h>
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#include <string.h>
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#include <math.h>
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#include "Errors.h"
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Page::Page(const char *filename)
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{
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map = NULL;
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hist = NULL;
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text = NULL;
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readMap(filename);
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}
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Page::~Page()
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{
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delete map;
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}
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void Page::readMap(const char *filename)
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{
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FILE *fp;
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int i,j;
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char *image; // FIXME: Good type
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tuple *tuplerow;
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if (!strcmp(filename, "-"))
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fp = stdin;
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else
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// FIXME: exception
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if(!(fp = fopen(filename,"r")))
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Errors::Fatal("Cannot open filename.");
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// Si existia un mapa, el borrem.
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if(map != NULL)
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delete map;
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pnm_readpaminit(fp, &pamImage, sizeof(pamImage));
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// FIXME: Read ok
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width = pamImage.width;
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height = pamImage.height;
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map = new Bitmap(width,height);
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tuplerow = pnm_allocpamrow(&pamImage);
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for (i=0; i<height; i++)
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{
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pnm_readpamrow(&pamImage, tuplerow);
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for (j=0; j<width; j++)
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{
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// We only read the first sample (changing 0 and 1)
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map->pixels[i][j] = tuplerow[j][0]?0:1;
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}
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}
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pnm_freepamrow(tuplerow);
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fclose(fp);
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}
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void Page::writeMap(const char *filename) const
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{
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pam outpam;
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FILE *fp;
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tuple *tuplerow;
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int i,j;
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outpam = pamImage;
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outpam.width = width;
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outpam.height = height;
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fprintf(stderr,"Writting %s: w:%i,h:%i\n", filename, width, height);
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if (!strcmp(filename, "-"))
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fp = stdout;
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else
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// FIXME: exception
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if(!(fp = fopen(filename,"w")))
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Errors::Fatal("Cannot open filename.");
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outpam.file = fp;
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pnm_writepaminit(&outpam);
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tuplerow = pnm_allocpamrow(&outpam);
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for (i=0; i<height; i++)
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{
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for (j=0; j<width; j++)
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{
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// We only write the first sample (changing 0 and 1)
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tuplerow[j][0] = map->pixels[i][j]?0:1;
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}
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pnm_writepamrow(&outpam, tuplerow);
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}
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pnm_freepamrow(tuplerow);
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fclose(fp);
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}
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/*
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static void Page::Initialize()
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{
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pnm_init(NULL,NULL);
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}
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*/
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float Page::ratioBlackWhite() const
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{
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int i,j;
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float white=0, black=0;
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for(i=0; i<height; i++)
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for (j=0; j<width; j++)
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if (map->pixels[i][j] == 0)
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white++;
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else
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black++;
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return black/white;
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}
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void Page::calcHistogram()
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{
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if (hist!=NULL)
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delete hist;
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map->calcHistogram(hist);
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}
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void Page::rotateMap(float angle)
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{
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Bitmap *newmap;
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rotateMap(angle, newmap);
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// Interchange maps: New -> Page's
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delete map;
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map = newmap;
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height = map->get_height();
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width = map->get_width();
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}
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void Page::rotateMap(float angle, Bitmap* &mapNew)
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{
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// Code taken from OCRchie
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int nx,ny,newheight,newwidth,oldheight,oldwidth,i,j,halfnewheight,halfnewwidth;
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int halfoldheight,halfoldwidth;
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double radians;
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double cosval,sinval;
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radians = -(angle) / ((180 / 3.142));
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cosval = cos(radians);
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sinval = sin(radians);
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oldheight = height;
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oldwidth = width;
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newwidth = (int)abs((int)(oldwidth*cosval)) + (int)abs((int)(oldheight*sinval));
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newheight = (int)abs((int)(-oldwidth*sinval)) + (int)abs((int)(oldheight*cosval));
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halfnewheight = newheight / 2;
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halfnewwidth = newwidth / 2;
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halfoldwidth = oldwidth /2;
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halfoldheight = oldheight /2 ;
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int num_chars = (newwidth / 8) + 1;
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mapNew = new Bitmap(newwidth,newheight);
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mapNew->setToZero();
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for(i=0;i < newheight;i++)
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{
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for(j=0;j < newwidth;j++)
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{
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nx =(int)( (j - halfnewwidth)*cosval + (i-halfnewheight)*sinval);
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ny =(int)( -((j - halfnewwidth)*sinval) + (i - halfnewheight)*cosval);
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nx = nx + halfoldwidth;
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ny = ny + halfoldheight;
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if ((nx < oldwidth) && (ny < oldheight) && (nx > 0) && (ny > 0))
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{
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mapNew->pixels[i][j] = map->pixels[ny][nx];
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}
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else
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{
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mapNew->pixels[i][j] = 0;
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}
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}
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}
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}
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void Page::tryAngles(float min, float max, float step)
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{
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float i;
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float std_dev;
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for(i=min; i<=max; i+=step)
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{
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std_dev = std_dev_lines_angle(i);
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fprintf(stderr, "Angle: %f, Dev: %f\n", i,
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std_dev);
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}
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}
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float Page::std_dev_lines_angle(float angle)
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{
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float retval;
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Bitmap *tmpmap;
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Histogram *tmphist;
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if (angle == 0)
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{
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map->calcHistogram(tmphist);
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}
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else
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{
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rotateMap(angle,tmpmap);
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tmpmap->calcHistogram(tmphist);
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delete tmpmap;
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}
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retval = tmphist->get_std_dev();
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delete tmphist;
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return retval;
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}
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float Page::getSkew(int depth, float margin)
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{
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float x1,x2,x3;
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float y1,y2,y3;
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float newx, newy;
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int i;
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x1 = -margin;
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x2 = 0;
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x3 = margin;
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/* Bret's Method */
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/*
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for (i=0; i<depth; i++)
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{
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y1 = std_dev_lines_angle(x1);
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y2 = std_dev_lines_angle(x2);
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y3 = std_dev_lines_angle(x3);
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fprintf(stderr, "New stddevs: %f, %f, %f\n", y1, y2, y3);
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newx = x2 - 0.5 * ((x2-x1)*(x2-x1) * (y2-y3) -
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(x2-x3)*(x2-x3) * (y2-y1)) /
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((x2-x1) * (y2-y3) - (x2-x3) * (y2-y1));
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// Comprovacions
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// Resultat
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if (newx > x1 && newx < x2)
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{
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x3 = x2;
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x2 = newx;
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}
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else if (newx > x2 && newx < x3)
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{
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x1 = x2;
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x2 = newx;
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}
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else
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Errors::Fatal("No convergence!");
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fprintf(stderr, "Nous punts: %f, %f, %f\n", x1,x2,x3);
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}
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*/
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/* Golden Slice */
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y1 = std_dev_lines_angle(x1);
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y2 = std_dev_lines_angle(x2);
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y3 = std_dev_lines_angle(x3);
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for (i=0; i<depth; i++)
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{
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// Flanc esquerra
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newx = (x2+x1)/2;
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newy = std_dev_lines_angle(newx);
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// Resultat
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if (newy < y2 )
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{
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x1 = newx;
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y1 = newy;
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}
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else // newy < y2
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{
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x3 = x2;
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y3 = y2;
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x2 = newx;
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y2 = newy;
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}
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// Flanc dret
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newx = (x3+x2)/2;
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newy = std_dev_lines_angle(newx);
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// Resultat
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if (newy < y2 )
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{
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x3 = newx;
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y3 = newy;
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}
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else // newy < y2
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{
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x1 = x2;
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y1 = y2;
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x2 = newx;
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y2 = newy;
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}
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fprintf(stderr, "Nous punts: %f, %f, %f\n", x1,x2,x3);
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}
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return x2;
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}
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void Page::getText()
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{
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if (text == NULL)
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text = new Text();
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text->getLines(map);
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}
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