1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
|
//
// C++ Implementation: BoatAnimation
//
// Description:
//
//
// Author: Thibaut GRIDEL <tgridel@free.fr>
//
// Copyright (c) 2008-2009 Thibaut GRIDEL
//
// 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 3 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, see <http://www.gnu.org/licenses/>.
//
//
#include <iostream>
#include <cmath>
#include <QtGui>
#include "boatanimation.h"
#include "situationmodel.h"
#include "trackmodel.h"
#include "boatmodel.h"
#include "boat.h"
/**
Populates the internal lists of Positions and Headings function
of time
This method parses the path of the \a track, does some stalling
analysis and determines position and heading as a function of time.
It also gives the pale color to \a track boats, while keeping
original color for animation \a boat.
*/
BoatAnimation::BoatAnimation(TrackModel *track, BoatGraphicsItem *boat, int maxSize, QGraphicsItemAnimation *parent)
: QGraphicsItemAnimation(parent),
m_track(track),
m_boat(boat),
m_maxSize(maxSize),
m_time(QTime::currentTime()) {
QPainterPath path = m_track->path();
int size = m_track->size() - 1;
if (size < 0) {
return;
}
QPointF point = path.elementAt(0);
setPosAt(0,point);
BoatModel *model = m_track->boats()[0];
setRotationAt(0,model->heading());
setsailAt(0, model->sailAngle() + model->trim());
for (int i=0; i< size; i++) {
qreal index = 0;
QPointF c1 = path.elementAt(i*3+1);
QPointF c2 = path.elementAt(i*3+2);
QPointF end = path.elementAt(i*3+3);
bool stalled = ((point == c1) || (c2 == end));
QPainterPath curve(point);
curve.cubicTo(c1,c2,end);
qreal length = curve.length();
float e = 8;
for (int j=1; j<=e; j++) {
qreal percent = curve.percentAtLength(length*j/e);
index = (i*e+j)/(maxSize*e);
setPosAt(index, curve.pointAtPercent(percent));
if (!stalled) {
setRotationAt(index, fmod(360+90-curve.angleAtPercent(percent),360.0));
}
}
model = m_track->boats()[i+1];
if (stalled) {
setRotationAt(index, fmod(model->heading(),360.0));
}
setsailAt(index, model->sailAngle() + model->trim());
point = end;
}
QColor color = m_track->color();
color.setAlpha(64);
m_track->setColor(color);
color.setAlpha(255);
m_boat->setColor(color);
m_boat->setOrder(0);
if (m_rotationList.isEmpty())
m_rotationList = rotationList();
}
/**
Resets the color and List of BoatModels in the track
*/
BoatAnimation::~BoatAnimation() {
QColor color = m_track->color();
color.setAlpha(255);
m_track->setColor(color);
while (!m_boats.isEmpty()) {
m_track->addBoat(m_boats.last());
m_boats.pop_back();
}
}
/**
Calculates an intermediate heading value that makes the least
angle change between 2 values, unlike \m linearRotationForStep()
*/
qreal BoatAnimation::linearAngleForStep(PairList pairList, qreal step, qreal defaultValue) const {
const PairList *source = &pairList;
step = qMin<qreal>(qMax<qreal>(step, 0), 1);
if (step == 1)
return source->last().second;
qreal stepBefore = 0;
qreal stepAfter = 1;
qreal valueBefore = source->first().first == 0 ? source->first().second : defaultValue;
qreal valueAfter = source->last().second;
// Find the closest step and value before the given step.
for (int i = 0; i < source->size() && step >= source->at(i).first; ++i) {
stepBefore = source->at(i).first;
valueBefore = source->at(i).second;
}
// Find the closest step and value after the given step.
for (int j = source->size() - 1; j >= 0 && step < source->at(j).first; --j) {
stepAfter = source->at(j).first;
valueAfter = source->at(j).second;
}
qreal minValue = qMin<qreal>(valueBefore,valueAfter);
qreal maxValue = qMax<qreal>(valueBefore,valueAfter);
if (maxValue - minValue <= 360 + minValue - maxValue) {
// Do a simple linear interpolation.
return valueBefore + (valueAfter - valueBefore) * ((step - stepBefore) / (stepAfter - stepBefore));
} else {
// Do a reverse linear interpolation.
if (valueBefore > valueAfter)
return valueBefore + (360 + valueAfter - valueBefore) * ((step - stepBefore) / (stepAfter - stepBefore));
else
return valueBefore + (valueAfter - valueBefore - 360) * ((step - stepBefore) / (stepAfter - stepBefore));
}
}
/**
Returns the interpolated value of heading at \a step
*/
qreal BoatAnimation::headingAt(qreal step) const {
if (step < 0.0 || step > 1.0)
qWarning("BoatAnimation::headingAt: invalid step = %f", step);
return linearAngleForStep(m_rotationList, step);
}
qreal BoatAnimation::sailAt(qreal step) const {
if (step < 0.0 || step > 1.0)
qWarning("BoatAnimation::sailAt: invalid step = %f", step);
return linearAngleForStep(m_sailList, step);
}
/**
Updates TrackModel and animation boat position and heading
at \a step time, with a rate limit of one refresh every 40ms
*/
void BoatAnimation::afterAnimationStep(qreal step) {
// limit update rate to 40ms
if ((m_time.elapsed() < 40) && (step != 0) && (step != 1)) {
return;
}
m_boat->boat()->setPosition(posAt(step));
qreal heading = headingAt(step);
m_boat->boat()->setHeading(heading);
qreal sailAngle = m_boat->boat()->sailAngle(heading);
m_boat->boat()->setTrim(sailAt(step)- sailAngle);
int index = floor(step * m_maxSize);
BoatModel *boat;
for (int i=m_track->size()-1; i > index; i--) {
boat = m_track->boats()[i];
m_boats.push_back(boat);
m_track->deleteBoat(boat);
}
if (!m_boats.isEmpty()) {
for (int i = m_track->size()-1; i < index; i++) {
m_track->addBoat(m_boats.last());
m_boats.pop_back();
}
}
if (index > m_track->size() - 1) {
return;
}
boat = m_track->boats()[index];
m_boat->boat()->setOverlap(boat->overlap());
m_boat->boat()->setFlag(boat->flag());
m_boat->boat()->setText(boat->text());
m_boat->boat()->setTextPosition(boat->textPosition());
m_boat->boat()->setSpin(boat->spin());
// trigger next update rate calculation
m_time.start();
}
|
