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git-svn-id: https://tesseract-ocr.googlecode.com/svn/trunk@876 d0cd1f9f-072b-0410-8dd7-cf729c803f20
324 lines
9.2 KiB
C++
324 lines
9.2 KiB
C++
/**********************************************************************
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* File: points.h (Formerly coords.h)
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* Description: Coordinate class definitions.
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* Author: Ray Smith
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* Created: Fri Mar 15 08:32:45 GMT 1991
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*
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* (C) Copyright 1991, Hewlett-Packard Ltd.
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** Licensed under the Apache License, Version 2.0 (the "License");
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** you may not use this file except in compliance with the License.
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** You may obtain a copy of the License at
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** http://www.apache.org/licenses/LICENSE-2.0
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** Unless required by applicable law or agreed to in writing, software
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** distributed under the License is distributed on an "AS IS" BASIS,
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** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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** See the License for the specific language governing permissions and
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** limitations under the License.
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*
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**********************************************************************/
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#ifndef POINTS_H
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#define POINTS_H
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#include <stdio.h>
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#include <math.h>
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#include "elst.h"
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class FCOORD;
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///integer coordinate
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class ICOORD
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{
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friend class FCOORD;
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public:
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///empty constructor
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ICOORD() {
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xcoord = ycoord = 0; //default zero
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}
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///constructor
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///@param xin x value
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///@param yin y value
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ICOORD(inT16 xin,
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inT16 yin) {
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xcoord = xin;
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ycoord = yin;
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}
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///destructor
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~ICOORD () {
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}
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///access function
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inT16 x() const {
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return xcoord;
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}
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///access_function
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inT16 y() const {
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return ycoord;
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}
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///rewrite function
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void set_x(inT16 xin) {
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xcoord = xin; //write new value
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}
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///rewrite function
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void set_y(inT16 yin) { //value to set
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ycoord = yin;
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}
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/// Set from the given x,y, shrinking the vector to fit if needed.
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void set_with_shrink(int x, int y);
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///find sq length
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float sqlength() const {
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return (float) (xcoord * xcoord + ycoord * ycoord);
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}
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///find length
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float length() const {
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return (float) sqrt (sqlength ());
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}
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///sq dist between pts
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float pt_to_pt_sqdist(const ICOORD &pt) const {
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ICOORD gap;
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gap.xcoord = xcoord - pt.xcoord;
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gap.ycoord = ycoord - pt.ycoord;
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return gap.sqlength ();
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}
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///Distance between pts
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float pt_to_pt_dist(const ICOORD &pt) const {
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return (float) sqrt (pt_to_pt_sqdist (pt));
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}
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///find angle
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float angle() const {
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return (float) atan2 ((double) ycoord, (double) xcoord);
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}
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///test equality
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BOOL8 operator== (const ICOORD & other) const {
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return xcoord == other.xcoord && ycoord == other.ycoord;
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}
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///test inequality
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BOOL8 operator!= (const ICOORD & other) const {
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return xcoord != other.xcoord || ycoord != other.ycoord;
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}
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///rotate 90 deg anti
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friend ICOORD operator! (const ICOORD &);
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///unary minus
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friend ICOORD operator- (const ICOORD &);
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///add
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friend ICOORD operator+ (const ICOORD &, const ICOORD &);
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///add
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friend ICOORD & operator+= (ICOORD &, const ICOORD &);
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///subtract
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friend ICOORD operator- (const ICOORD &, const ICOORD &);
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///subtract
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friend ICOORD & operator-= (ICOORD &, const ICOORD &);
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///scalar product
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friend inT32 operator% (const ICOORD &, const ICOORD &);
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///cross product
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friend inT32 operator *(const ICOORD &,
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const ICOORD &);
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///multiply
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friend ICOORD operator *(const ICOORD &,
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inT16);
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///multiply
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friend ICOORD operator *(inT16,
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const ICOORD &);
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///multiply
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friend ICOORD & operator*= (ICOORD &, inT16);
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///divide
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friend ICOORD operator/ (const ICOORD &, inT16);
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///divide
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friend ICOORD & operator/= (ICOORD &, inT16);
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///rotate
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///@param vec by vector
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void rotate(const FCOORD& vec);
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/// Setup for iterating over the pixels in a vector by the well-known
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/// Bresenham rendering algorithm.
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/// Starting with major/2 in the accumulator, on each step move by
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/// major_step, and then add minor to the accumulator. When
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/// accumulator >= major subtract major and also move by minor_step.
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void setup_render(ICOORD* major_step, ICOORD* minor_step,
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int* major, int* minor) const;
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// Writes to the given file. Returns false in case of error.
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bool Serialize(FILE* fp) const;
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// Reads from the given file. Returns false in case of error.
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// If swap is true, assumes a big/little-endian swap is needed.
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bool DeSerialize(bool swap, FILE* fp);
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protected:
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inT16 xcoord; //< x value
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inT16 ycoord; //< y value
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};
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class DLLSYM ICOORDELT:public ELIST_LINK, public ICOORD
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//embedded coord list
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{
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public:
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///empty constructor
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ICOORDELT() {
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}
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///constructor from ICOORD
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ICOORDELT (ICOORD icoord):ICOORD (icoord) {
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}
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///constructor
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///@param xin x value
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///@param yin y value
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ICOORDELT(inT16 xin,
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inT16 yin) {
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xcoord = xin;
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ycoord = yin;
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}
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static ICOORDELT* deep_copy(const ICOORDELT* src) {
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ICOORDELT* elt = new ICOORDELT;
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*elt = *src;
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return elt;
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}
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};
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ELISTIZEH (ICOORDELT)
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class DLLSYM FCOORD
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{
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public:
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///empty constructor
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FCOORD() {
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}
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///constructor
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///@param xvalue x value
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///@param yvalue y value
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FCOORD(float xvalue,
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float yvalue) {
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xcoord = xvalue; //set coords
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ycoord = yvalue;
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}
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FCOORD( //make from ICOORD
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ICOORD icoord) { //coords to set
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xcoord = icoord.xcoord;
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ycoord = icoord.ycoord;
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}
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float x() const { //get coords
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return xcoord;
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}
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float y() const {
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return ycoord;
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}
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///rewrite function
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void set_x(float xin) {
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xcoord = xin; //write new value
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}
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///rewrite function
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void set_y(float yin) { //value to set
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ycoord = yin;
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}
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///find sq length
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float sqlength() const {
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return xcoord * xcoord + ycoord * ycoord;
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}
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///find length
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float length() const {
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return (float) sqrt (sqlength ());
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}
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///sq dist between pts
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float pt_to_pt_sqdist(const FCOORD &pt) const {
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FCOORD gap;
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gap.xcoord = xcoord - pt.xcoord;
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gap.ycoord = ycoord - pt.ycoord;
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return gap.sqlength ();
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}
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///Distance between pts
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float pt_to_pt_dist(const FCOORD &pt) const {
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return (float) sqrt (pt_to_pt_sqdist (pt));
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}
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///find angle
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float angle() const {
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return (float) atan2 (ycoord, xcoord);
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}
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// Returns the standard feature direction corresponding to this.
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// See binary_angle_plus_pi below for a description of the direction.
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uinT8 to_direction() const;
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// Sets this with a unit vector in the given standard feature direction.
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void from_direction(uinT8 direction);
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// Converts an angle in radians (from ICOORD::angle or FCOORD::angle) to a
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// standard feature direction as an unsigned angle in 256ths of a circle
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// measured anticlockwise from (-1, 0).
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static uinT8 binary_angle_plus_pi(double angle);
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// Inverse of binary_angle_plus_pi returns an angle in radians for the
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// given standard feature direction.
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static double angle_from_direction(uinT8 direction);
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// Returns the point on the given line nearest to this, ie the point such
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// that the vector point->this is perpendicular to the line.
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// The line is defined as a line_point and a dir_vector for its direction.
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// dir_vector need not be a unit vector.
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FCOORD nearest_pt_on_line(const FCOORD& line_point,
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const FCOORD& dir_vector) const;
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///Convert to unit vec
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bool normalise();
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///test equality
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BOOL8 operator== (const FCOORD & other) {
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return xcoord == other.xcoord && ycoord == other.ycoord;
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}
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///test inequality
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BOOL8 operator!= (const FCOORD & other) {
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return xcoord != other.xcoord || ycoord != other.ycoord;
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}
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///rotate 90 deg anti
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friend FCOORD operator! (const FCOORD &);
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///unary minus
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friend FCOORD operator- (const FCOORD &);
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///add
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friend FCOORD operator+ (const FCOORD &, const FCOORD &);
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///add
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friend FCOORD & operator+= (FCOORD &, const FCOORD &);
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///subtract
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friend FCOORD operator- (const FCOORD &, const FCOORD &);
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///subtract
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friend FCOORD & operator-= (FCOORD &, const FCOORD &);
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///scalar product
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friend float operator% (const FCOORD &, const FCOORD &);
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///cross product
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friend float operator *(const FCOORD &, const FCOORD &);
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///multiply
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friend FCOORD operator *(const FCOORD &, float);
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///multiply
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friend FCOORD operator *(float, const FCOORD &);
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///multiply
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friend FCOORD & operator*= (FCOORD &, float);
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///divide
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friend FCOORD operator/ (const FCOORD &, float);
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///rotate
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///@param vec by vector
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void rotate(const FCOORD vec);
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// unrotate - undo a rotate(vec)
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// @param vec by vector
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void unrotate(const FCOORD &vec);
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///divide
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friend FCOORD & operator/= (FCOORD &, float);
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private:
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float xcoord; //2 floating coords
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float ycoord;
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};
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#include "ipoints.h" /*do inline funcs */
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#endif
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