File size: 3,619 Bytes
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* Copyright (c) 2008-2010 Lukáš Tvrdý <lukast.dev@gmail.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
#include "trajectory.h"
#include <cmath>
#include <kis_debug.h>
Trajectory::Trajectory()
{
m_i = 0;
m_size = 0;
}
Trajectory::~Trajectory()
{
}
void Trajectory::addPoint(QPointF pos)
{
if (m_i >= m_path.size()) {
m_path.append(pos);
m_i++;
} else {
m_path[m_i] = pos;
m_i++;
}
m_size++;
}
void Trajectory::reset()
{
m_size = 0;
m_i = 0;
}
const QVector<QPointF> &Trajectory::getLinearTrajectory(const QPointF &start, const QPointF &end, double space)
{
Q_UNUSED(space);
reset();
// Width and height of the line
float xd = (end.x() - start.x());
float yd = (end.y() - start.y());
int x = (int)start.x();
int y = (int)start.y();
float fx = start.x();
float fy = start.y();
float m = yd / xd;
int y2 = (int)end.y();
int x2 = (int)end.x();
//m_path.append(start);
addPoint(start);
if (fabs(m) > 1) {
// y - directional axis
int incr;
if (yd > 0) {
m = 1.0f / m;
incr = 1;
} else {
m = -1.0f / m;
incr = -1;
}
while (y != y2) {
fx = fx + m;
y = y + incr;
x = (int)(fx + 0.5f);
addPoint(QPointF(fx, y));
}
} else {
// x - directional axis
int incr;
if (xd > 0) {
incr = 1;
} else {
incr = -1;
m = -m;
}
while (x != x2) {
fy = fy + m;
x = x + incr;
y = (int)(fy + 0.5f);
addPoint(QPointF(x, fy));
}
}
addPoint(end);
return m_path;
}
QVector<QPointF> Trajectory::getDDATrajectory(QPointF start, QPointF end, double space)
{
Q_UNUSED(space);
reset();
// Width and height of the line
int xd = (int)(end.x() - start.x());
int yd = (int)(end.y() - start.y());
int x = (int)start.x();
int y = (int)start.y();
float fx = start.x();
float fy = start.y();
float m = (float)yd / (float)xd;
int y2 = (int)end.y();
int x2 = (int)end.x();
if (fabs(m) > 1) {
int incr;
if (yd > 0) {
m = 1.0f / m;
incr = 1;
}
else {
m = -1.0f / m;
incr = -1;
}
while (y != y2) {
fx = fx + m;
y = y + incr;
x = (int)(fx + 0.5f);
addPoint(QPointF(x, y));
}
} else {
int incr;
if (xd > 0) {
incr = 1;
}
else {
incr = -1;
m = -m;
}
while (x != x2) {
fy = fy + m;
x = x + incr;
y = (int)(fy + 0.5f);
addPoint(QPointF(x, y));
}
}
return m_path;
}
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