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git-svn-id: https://tesseract-ocr.googlecode.com/svn/trunk@531 d0cd1f9f-072b-0410-8dd7-cf729c803f20
86 lines
2.7 KiB
C++
86 lines
2.7 KiB
C++
/**********************************************************************
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* File: points.c (Formerly coords.c)
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* Description: Member functions for coordinate classes.
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* Author: Ray Smith
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* Created: Fri Mar 15 08:58:17 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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#include "mfcpch.h" //precompiled headers
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#include <stdlib.h>
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#include "ndminx.h"
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#include "serialis.h"
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#include "points.h"
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ELISTIZE (ICOORDELT) //turn to list
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bool FCOORD::normalise() { //Convert to unit vec
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float len = length ();
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if (len < 0.0000000001) {
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return false;
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}
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xcoord /= len;
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ycoord /= len;
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return true;
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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 ICOORD::set_with_shrink(int x, int y) {
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// Fit the vector into an ICOORD, which is 16 bit.
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int factor = 1;
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int max_extent = MAX(abs(x), abs(y));
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if (max_extent > MAX_INT16)
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factor = max_extent / MAX_INT16 + 1;
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xcoord = x / factor;
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ycoord = y / factor;
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}
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// The fortran/basic sgn function returns -1, 0, 1 if x < 0, x == 0, x > 0
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// respectively.
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static int sign(int x) {
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if (x < 0)
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return -1;
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else
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return x > 0 ? 1 : 0;
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}
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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 add major_step,
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// and then add minor to the accumulator. When the accumulator >= major
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// subtract major and step a minor step.
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void ICOORD::setup_render(ICOORD* major_step, ICOORD* minor_step,
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int* major, int* minor) const {
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int abs_x = abs(xcoord);
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int abs_y = abs(ycoord);
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if (abs_x >= abs_y) {
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// X-direction is major.
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major_step->xcoord = sign(xcoord);
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major_step->ycoord = 0;
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minor_step->xcoord = 0;
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minor_step->ycoord = sign(ycoord);
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*major = abs_x;
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*minor = abs_y;
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} else {
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// Y-direction is major.
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major_step->xcoord = 0;
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major_step->ycoord = sign(ycoord);
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minor_step->xcoord = sign(xcoord);
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minor_step->ycoord = 0;
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*major = abs_y;
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*minor = abs_x;
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}
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}
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