58 lines
2.0 KiB
C++
58 lines
2.0 KiB
C++
/*
|
|
|
|
Copyright (c) 2013, Project OSRM, Dennis Luxen, others
|
|
All rights reserved.
|
|
|
|
Redistribution and use in source and binary forms, with or without modification,
|
|
are permitted provided that the following conditions are met:
|
|
|
|
Redistributions of source code must retain the above copyright notice, this list
|
|
of conditions and the following disclaimer.
|
|
Redistributions in binary form must reproduce the above copyright notice, this
|
|
list of conditions and the following disclaimer in the documentation and/or
|
|
other materials provided with the distribution.
|
|
|
|
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
|
|
ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
|
|
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
|
|
DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR
|
|
ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
|
|
(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
|
|
LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
|
|
ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
|
|
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
|
|
SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|
|
|
*/
|
|
|
|
#ifndef BRESENHAM_H_
|
|
#define BRESENHAM_H_
|
|
|
|
#include <cmath>
|
|
#include <vector>
|
|
|
|
typedef std::pair<unsigned, unsigned> BresenhamPixel;
|
|
|
|
inline void Bresenham (int x0, int y0, const int x1, int const y1, std::vector<BresenhamPixel> &resultList) {
|
|
int dx = std::abs(x1-x0);
|
|
int dy = std::abs(y1-y0);
|
|
int sx = (x0 < x1 ? 1 : -1);
|
|
int sy = (y0 < y1 ? 1 : -1);
|
|
int err = dx - dy;
|
|
while(true) {
|
|
resultList.push_back(std::make_pair(x0,y0));
|
|
if(x0 == x1 && y0 == y1) break;
|
|
int e2 = 2* err;
|
|
if ( e2 > -dy) {
|
|
err -= dy;
|
|
x0 += sx;
|
|
}
|
|
if(e2 < dx) {
|
|
err+= dx;
|
|
y0 += sy;
|
|
}
|
|
}
|
|
}
|
|
|
|
#endif /* BRESENHAM_H_ */
|