C_BLOB::C_BLOB( //constructor
C_OUTLINE_LIST *outline_list //in random order
) {
C_OUTLINE *outline; //current outline
C_OUTLINE_IT it = outline_list;//iterator
while (!it.empty ()) { //grab the list
outline = it.extract (); //get off the list
//put it in place
position_outline(outline, &outlines);
if (!it.empty ())
it.forward ();
}
it.set_to_list (&outlines);
for (it.mark_cycle_pt (); !it.cycled_list (); it.forward ()) {
outline = it.data ();
if (outline->turn_direction () < 0) {
outline->reverse ();
reverse_outline_list (outline->child ());
outline->set_flag (COUT_INVERSE, TRUE);
}
else {
outline->set_flag (COUT_INVERSE, FALSE);
}
}
}
inT32 C_OUTLINE::area() { //winding number
int stepindex; //current step
inT32 total_steps; //steps to do
inT32 total; //total area
ICOORD pos; //position of point
ICOORD next_step; //step to next pix
C_OUTLINE_IT it = child ();
pos = start_pos ();
total_steps = pathlength ();
total = 0;
for (stepindex = 0; stepindex < total_steps; stepindex++) {
//all intersected
next_step = step (stepindex);
if (next_step.x () < 0)
total += pos.y ();
else if (next_step.x () > 0)
total -= pos.y ();
pos += next_step;
}
for (it.mark_cycle_pt (); !it.cycled_list (); it.forward ())
total += it.data ()->area ();//add areas of children
return total;
}
inT32 C_OUTLINE::perimeter() {
inT32 total_steps; // Return value.
C_OUTLINE_IT it = child();
total_steps = pathlength();
for (it.mark_cycle_pt(); !it.cycled_list(); it.forward())
total_steps += it.data()->pathlength(); // Add perimeters of children.
return total_steps;
}
TBOX C_BLOB::bounding_box() { //bounding box
C_OUTLINE *outline; //current outline
C_OUTLINE_IT it = &outlines; //outlines of blob
TBOX box; //bounding box
for (it.mark_cycle_pt (); !it.cycled_list (); it.forward ()) {
outline = it.data ();
box += outline->bounding_box ();
}
return box;
}
inT32 C_BLOB::outer_area() { //area
C_OUTLINE *outline; //current outline
C_OUTLINE_IT it = &outlines; //outlines of blob
inT32 total; //total area
total = 0;
for (it.mark_cycle_pt (); !it.cycled_list (); it.forward ()) {
outline = it.data ();
total += outline->outer_area ();
}
return total;
}
inT32 C_BLOB::perimeter() {
C_OUTLINE *outline; // current outline
C_OUTLINE_IT it = &outlines; // outlines of blob
inT32 total; // total perimeter
total = 0;
for (it.mark_cycle_pt(); !it.cycled_list(); it.forward()) {
outline = it.data();
total += outline->perimeter();
}
return total;
}
static void reverse_outline_list( //reverse outlines
C_OUTLINE_LIST *list //outline to reverse
) {
C_OUTLINE *outline; //current outline
C_OUTLINE_IT it = list; //iterator
for (it.mark_cycle_pt (); !it.cycled_list (); it.forward ()) {
outline = it.data ();
outline->reverse (); //reverse it
if (!outline->child ()->empty ())
reverse_outline_list (outline->child ());
}
}
inT32 C_BLOB::count_transitions( //area
inT32 threshold //on size
) {
C_OUTLINE *outline; //current outline
C_OUTLINE_IT it = &outlines; //outlines of blob
inT32 total; //total area
total = 0;
for (it.mark_cycle_pt (); !it.cycled_list (); it.forward ()) {
outline = it.data ();
total += outline->count_transitions (threshold);
}
return total;
}
static void plot_outline_list( //draw outlines
C_OUTLINE_LIST *list, //outline to draw
ScrollView* window, //window to draw in
ScrollView::Color colour, //colour to use
ScrollView::Color child_colour //colour of children
) {
C_OUTLINE *outline; //current outline
C_OUTLINE_IT it = list; //iterator
for (it.mark_cycle_pt (); !it.cycled_list (); it.forward ()) {
outline = it.data ();
//draw it
outline->plot (window, colour);
if (!outline->child ()->empty ())
plot_outline_list (outline->child (), window,
child_colour, child_colour);
}
}
/**********************************************************************
* position_outline
*
* Position the outline in the given list at the relevant place
* according to its nesting.
**********************************************************************/
static void position_outline( //put in place
C_OUTLINE *outline, //thing to place
C_OUTLINE_LIST *destlist //desstination list
) {
C_OUTLINE *dest_outline; //outline from dest list
C_OUTLINE_IT it = destlist; //iterator
//iterator on children
C_OUTLINE_IT child_it = outline->child ();
if (!it.empty ()) {
do {
dest_outline = it.data (); //get destination
//encloses dest
if (*dest_outline < *outline) {
//take off list
dest_outline = it.extract ();
//put this in place
it.add_after_then_move (outline);
//make it a child
child_it.add_to_end (dest_outline);
while (!it.at_last ()) {
it.forward (); //do rest of list
//check for other children
dest_outline = it.data ();
if (*dest_outline < *outline) {
//take off list
dest_outline = it.extract ();
child_it.add_to_end (dest_outline);
//make it a child
if (it.empty ())
break;
}
}
return; //finished
}
//enclosed by dest
else if (*outline < *dest_outline) {
position_outline (outline, dest_outline->child ());
//place in child list
return; //finished
}
it.forward ();
}
while (!it.at_first ());
}
it.add_to_end (outline); //at outer level
}
TBOX box = outline->bounding_box();
Pix* pix = GridReducedPix(box, gridsize, bleft, left, bottom);
int wpl = pixGetWpl(pix);
l_uint32* data = pixGetData(pix);
int length = outline->pathlength();
ICOORD pos = outline->start_pos();
for (int i = 0; i < length; ++i) {
int grid_x = (pos.x() - bleft.x()) / gridsize - *left;
int grid_y = (pos.y() - bleft.y()) / gridsize - *bottom;
SET_DATA_BIT(data + grid_y * wpl, grid_x);
pos += outline->step(i);
}
return pix;
}
#if 0 // Example code shows how to use TraceOutlineOnReducedPix.
C_OUTLINE_IT ol_it(blob->cblob()->out_list());
int grid_left, grid_bottom;
Pix* pix = TraceOutlineOnReducedPix(ol_it.data(), gridsize_, bleft_,
&grid_left, &grid_bottom);
grid->InsertPixPtBBox(grid_left, grid_bottom, pix, blob);
pixDestroy(&pix);
#endif
// As TraceOutlineOnReducedPix above, but on a BLOCK instead of a C_OUTLINE.
Pix* TraceBlockOnReducedPix(BLOCK* block, int gridsize,
ICOORD bleft, int* left, int* bottom) {
TBOX box = block->bounding_box();
Pix* pix = GridReducedPix(box, gridsize, bleft, left, bottom);
int wpl = pixGetWpl(pix);
l_uint32* data = pixGetData(pix);
ICOORDELT_IT it(block->poly_block()->points());
