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bresenham.cpp
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bresenham.cpp
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#include "stdSysImports.h"
#include "bresenham.h"
using std::vector;
using std::string;
using std::pair;
float slope(int x1, int y1, int x2, int y2){
return float((y2-y1))/(x2-x1);
}
void bresenham1(int x1, int y1, int x2, int y2, string filename) // for slopes <= 1
{
std::ofstream myfile;
myfile.open(filename);
int o45 = 0, o8 = 0;
if (x2-x1<0 && y2-y1>0) {
x2 += 2*(x1-x2);
o45 = 1;
}
else if (x2 - x1 < 0 && y2-y1 < 0){
x2 += 2*(x1-x2);
y2 += 2*(y1-y2);
o45 = 1;
o8 = 1;
}
else if (x2 - x1 > 0 && y2 - y1 < 0){
y2 += 2*(y1-y2);
o8 = 1;
}
int m_new = 2 * (y2 - y1);
int slope_error_new = m_new - (x2 - x1);
for (int x = x1, y = y1; x <= x2; x++)
{
//std::cout << "(" << x - o45*(2*(x-x1)) << "," << y - o8*(2*(y-y1)) << ")\n";
myfile << std::to_string(x - o45*(2*(x-x1))) + ", " + std::to_string(y - o8*(2*(y-y1))) + "\n";
// Add slope to increment angle formed
slope_error_new += m_new;
// Slope error reached limit, time to
// increment y and update slope error.
if (slope_error_new >= 0)
{
y++;
slope_error_new -= 2 * (x2 - x1);
}
}
myfile.close();
}
void bresenham2(int x1, int y1, int x2, int y2, string filename) //for reflected slopes of > 1
{
std::ofstream myfile;
myfile.open(filename);
int o36 = 0, o7 = 0;
if (x2-x1<0 && y2-y1>0) {
x2 += 2*(x1-x2);
o36 = 1;
}
else if (x2 - x1 < 0 && y2-y1 < 0){
x2 += 2*(x1-x2);
y2 += 2*(y1-y2);
o36 = 1;
o7 = 1;
}
else if (x2 - x1 > 0 && y2 - y1 < 0){
y2 += 2*(y1-y2);
o7 = 1;
}
int m_new = 2 * (x2 - x1);
int slope_error_new = m_new - (y2 - y1);
for (int x = x1, y = y1; y <= y2; y++)
{
//std::cout << "(" << x - o36*(2*(x-x1)) << "," << y - o7*(2*(y-y1)) << ")\n";
myfile << std::to_string(x - o36*(2*(x-x1))) + ", " + std::to_string(y - o7*(2*(y-y1))) + "\n";
// Add slope to increment angle formed
slope_error_new += m_new;
// Slope error reached limit, time to
// increment y and update slope error.
if (slope_error_new >= 0)
{
x++;
slope_error_new -= 2 * (y2 - y1);
}
}
myfile.close();
}
void bresenham(int x1, int y1, int x2, int y2, string filename){
float m = slope(x1,y1,x2,y2);
if (abs(m)<= 1) {
bresenham1(x1,y1,x2,y2,filename);
}
else{
bresenham2(x1,y1,x2,y2,filename);
}
}
vector<pair<int,int>> bresenham1step(int x1, int y1, int x2, int y2, int steps) // for slopes <= 1
{
int o45 = 0, o8 = 0;
if (x2-x1<0 && y2-y1>0) {
x2 += 2*(x1-x2);
o45 = 1;
}
else if (x2 - x1 < 0 && y2-y1 < 0){
x2 += 2*(x1-x2);
y2 += 2*(y1-y2);
o45 = 1;
o8 = 1;
}
else if (x2 - x1 > 0 && y2 - y1 < 0){
y2 += 2*(y1-y2);
o8 = 1;
}
vector<pair<int,int>> temp(steps);
int m_new = 2 * (y2 - y1);
int slope_error_new = m_new - (x2 - x1);
for (int x = x1, y = y1, i = 0; x <= x2 && i < 1+steps; x++, i++)
{
temp[i] = {x - o45*(2*(x-x1)),y - o8*(2*(y-y1))};
// Add slope to increment angle formed
slope_error_new += m_new;
// Slope error reached limit, time to
// increment y and update slope error.
if (slope_error_new >= 0)
{
y++;
slope_error_new -= 2 * (x2 - x1);
}
}
return temp;
}
vector<pair<int,int>> bresenham2step(int x1, int y1, int x2, int y2, int steps) //for reflected slopes of > 1
{
int o36 = 0, o7 = 0;
if (x2-x1<0 && y2-y1>0) {
x2 += 2*(x1-x2);
o36 = 1;
}
else if (x2 - x1 < 0 && y2-y1 < 0){
x2 += 2*(x1-x2);
y2 += 2*(y1-y2);
o36 = 1;
o7 = 1;
}
else if (x2 - x1 > 0 && y2 - y1 < 0){
y2 += 2*(y1-y2);
o7 = 1;
}
vector<pair<int,int>> temp(steps);
int m_new = 2 * (x2 - x1);
int slope_error_new = m_new - (y2 - y1);
for (int x = x1, y = y1, i = 0; y <= y2 && i < 1+ steps; y++, i ++)
{
temp[i] = std::make_pair(x - o36*(2*(x-x1)), y - o7*(2*(y-y1)));
//std::cout << "(" << x - o36*(2*(x-x1)) << "," << y - o7*(2*(y-y1)) << ")\n";
//myfile << std::to_string(x - o36*(2*(x-x1))) + ", " + std::to_string(y - o7*(2*(y-y1))) + "\n";
// Add slope to increment angle formed
slope_error_new += m_new;
// Slope error reached limit, time to
// increment y and update slope error.
if (slope_error_new >= 0)
{
x++;
slope_error_new -= 2 * (y2 - y1);
}
}
return temp;
}
vector<pair<int,int>> bresenhamstep(std::pair<int,int> u, std::pair<int,int> v,int steps){
int x1 = u.first, x2 = v.first, y1 = u.second, y2 = v.second;
vector<pair<int,int>> edgecase(steps);
if (x1==x2){
int dir = (y2-y1)/abs(y2-y1);
for (int i = 0;i < steps;i++){
edgecase[i] = std::make_pair(x1,y1 + i*dir);
}
return edgecase;
}
else if (y1 == y2){
int dir = (x2-x1)/abs(x2-x1);
for (int i = 0;i < steps;i++){
edgecase[i] = std::make_pair(x1+i*dir,y1);
}
return edgecase;
}
else{
float m = slope(x1,y1,x2,y2);
if (abs(m)<= 1) {
return bresenham1step(x1,y1,x2,y2,steps);
}
else{
return bresenham2step(x1,y1,x2,y2,steps);
}
}
}
/*
int main () {
//file
//std::ofstream myfile;
//myfile.open("bresenhamstep.csv");
int x0, y0, x1, x2, y1, y2;
vector<std::pair<int,int>> boat(600);
std:: cout << boat.size() << std::endl;
//std::cout << "Enter x2, y2:" << std::endl;
//std::cin >> x2 >> y2;
x2 = 2048; y2 = 2048;
boat = bresenhamstep({2500,3000},{x2,y2},1000);
for (int i = 0;i<1000;i++){
std::cout << i << " " << boat[i].first<< ' ' << boat[i].second << std::endl;
}
//myfile.close();
return 0;
}
*/