mirror of
https://github.com/tesseract-ocr/tesseract.git
synced 2024-11-27 20:59:36 +08:00
10c1169d98
git-svn-id: https://tesseract-ocr.googlecode.com/svn/trunk@860 d0cd1f9f-072b-0410-8dd7-cf729c803f20
114 lines
3.2 KiB
C++
114 lines
3.2 KiB
C++
/**********************************************************************
|
|
* File: polyblk.h (Formerly poly_block.h)
|
|
* Description: Polygonal blocks
|
|
* Author: Sheelagh Lloyd?
|
|
* Created:
|
|
*
|
|
* (C) Copyright 1993, Hewlett-Packard Ltd.
|
|
** Licensed under the Apache License, Version 2.0 (the "License");
|
|
** you may not use this file except in compliance with the License.
|
|
** You may obtain a copy of the License at
|
|
** http://www.apache.org/licenses/LICENSE-2.0
|
|
** Unless required by applicable law or agreed to in writing, software
|
|
** distributed under the License is distributed on an "AS IS" BASIS,
|
|
** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
** See the License for the specific language governing permissions and
|
|
** limitations under the License.
|
|
*
|
|
**********************************************************************/
|
|
#ifndef POLYBLK_H
|
|
#define POLYBLK_H
|
|
|
|
#include "publictypes.h"
|
|
#include "elst.h"
|
|
#include "points.h"
|
|
#include "rect.h"
|
|
#include "scrollview.h"
|
|
|
|
class DLLSYM POLY_BLOCK {
|
|
public:
|
|
POLY_BLOCK() {
|
|
}
|
|
// Initialize from box coordinates.
|
|
POLY_BLOCK(const TBOX& box, PolyBlockType type);
|
|
POLY_BLOCK(ICOORDELT_LIST *points, PolyBlockType type);
|
|
~POLY_BLOCK () {
|
|
}
|
|
|
|
TBOX *bounding_box() { // access function
|
|
return &box;
|
|
}
|
|
|
|
ICOORDELT_LIST *points() { // access function
|
|
return &vertices;
|
|
}
|
|
|
|
void compute_bb();
|
|
|
|
PolyBlockType isA() const {
|
|
return type;
|
|
}
|
|
|
|
bool IsText() const {
|
|
return PTIsTextType(type);
|
|
}
|
|
|
|
// Rotate about the origin by the given rotation. (Analogous to
|
|
// multiplying by a complex number.
|
|
void rotate(FCOORD rotation);
|
|
// Reflect the coords of the polygon in the y-axis. (Flip the sign of x.)
|
|
void reflect_in_y_axis();
|
|
// Move by adding shift to all coordinates.
|
|
void move(ICOORD shift);
|
|
|
|
void plot(ScrollView* window, inT32 num);
|
|
|
|
#ifndef GRAPHICS_DISABLED
|
|
void fill(ScrollView* window, ScrollView::Color colour);
|
|
#endif // GRAPHICS_DISABLED
|
|
|
|
// Returns true if other is inside this.
|
|
bool contains(POLY_BLOCK *other);
|
|
|
|
// Returns true if the polygons of other and this overlap.
|
|
bool overlap(POLY_BLOCK *other);
|
|
|
|
// Returns the winding number of this around the test_pt.
|
|
// Positive for anticlockwise, negative for clockwise, and zero for
|
|
// test_pt outside this.
|
|
inT16 winding_number(const ICOORD &test_pt);
|
|
|
|
#ifndef GRAPHICS_DISABLED
|
|
// Static utility functions to handle the PolyBlockType.
|
|
// Returns a color to draw the given type.
|
|
static ScrollView::Color ColorForPolyBlockType(PolyBlockType type);
|
|
#endif // GRAPHICS_DISABLED
|
|
|
|
private:
|
|
ICOORDELT_LIST vertices; // vertices
|
|
TBOX box; // bounding box
|
|
PolyBlockType type; // Type of this region.
|
|
};
|
|
|
|
// Class to iterate the scanlines of a polygon.
|
|
class DLLSYM PB_LINE_IT {
|
|
public:
|
|
PB_LINE_IT(POLY_BLOCK *blkptr) {
|
|
block = blkptr;
|
|
}
|
|
|
|
void set_to_block(POLY_BLOCK * blkptr) {
|
|
block = blkptr;
|
|
}
|
|
|
|
// Returns a list of runs of pixels for the given y coord.
|
|
// Each element of the returned list is the start (x) and extent(y) of
|
|
// a run inside the region.
|
|
// Delete the returned list after use.
|
|
ICOORDELT_LIST *get_line(inT16 y);
|
|
|
|
private:
|
|
POLY_BLOCK * block;
|
|
};
|
|
#endif
|