blob: 7812d5020c3ff691f014fb65e349706383b5b77a (
plain)
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
|
/*
* Copyright (C) 2011 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <cutils/log.h>
#include <cmath>
#include "geometry.h"
namespace android {
namespace filterfw {
float Point::Length() const {
return std::sqrt(x_ * x_ + y_ * y_);
}
bool Point::ScaleTo(float new_length) {
float length = Length();
if (length == 0.0f) {
return false;
}
x_ *= new_length / length;
y_ *= new_length / length;
return true;
}
float Point::Distance(const Point& p0, const Point& p1) {
Point diff = p1 - p0;
return diff.Length();
}
Point Point::operator+(const Point& other) const {
Point out;
out.x_ = x_ + other.x_;
out.y_ = y_ + other.y_;
return out;
}
Point Point::operator-(const Point& other) const {
Point out;
out.x_ = x_ - other.x_;
out.y_ = y_ - other.y_;
return out;
}
Point Point::operator*(float factor) const {
Point out;
out.x_ = factor * x_;
out.y_ = factor * y_;
return out;
}
void Point::Rotate90Clockwise() {
const float x = x_;
x_ = y_;
y_ = -x;
}
bool Rect::ExpandToAspectRatio(float ratio) {
if (width <= 0.0f || height <= 0.0f || ratio <= 0.0f) {
return false;
}
const float current_ratio = width / height;
if (current_ratio < ratio) {
const float dx = width * (ratio / current_ratio - 1.0f);
x -= dx / 2.0f;
width += dx;
} else {
const float dy = height * (current_ratio / ratio - 1.0f);
y -= dy / 2.0f;
height += dy;
}
return true;
}
bool Rect::ExpandToMinLength(float length) {
if (width <= 0.0f || height <= 0.0f || length <= 0.0f) {
return false;
}
const float current_length = width > height ? width : height;
if (length > current_length) {
const float dx = width * (length / current_length - 1.0f);
x -= dx / 2.0f;
width += dx;
const float dy = height * (length / current_length - 1.0f);
y -= dy / 2.0f;
height += dy;
}
return true;
}
bool Rect::ScaleWithLengthLimit(float factor, float max_length) {
if (width <= 0.0f || height <= 0.0f || factor <= 0.0f) {
return false;
}
const float current_length = width > height ? width : height;
if (current_length >= max_length) {
return true;
}
float f = factor;
if (current_length * f > max_length) {
f *= max_length / (current_length * f);
}
const float dx = width * (f - 1.0f);
x -= dx / 2.0f;
width += dx;
const float dy = height * (f - 1.0f);
y -= dy / 2.0f;
height += dy;
return true;
}
const Point& Quad::point(int ix) const {
ALOG_ASSERT(ix < static_cast<int>(points_.size()), "Access out of bounds");
return points_[ix];
}
bool SlantedRect::FromCenterAxisAndLengths(const Point& center,
const Point& vert_axis,
const Point& lengths) {
Point dy = vert_axis;
if (!dy.ScaleTo(lengths.y() / 2.0f)) {
ALOGE("Illegal axis: %f %f", vert_axis.x(), vert_axis.y());
return false;
}
Point dx = dy;
dx.Rotate90Clockwise();
dx.ScaleTo(lengths.x() / 2.0f);
points_[0] = center - dx - dy;
points_[1] = center + dx - dy;
points_[2] = center - dx + dy;
points_[3] = center + dx + dy;
width_ = lengths.x();
height_ = lengths.y();
return true;
}
} // namespace filterfw
} // namespace android
|
