geometry.h revision 65953da4636fbf5f0a24b8f5f2b5fa7d76ff13d9 
1/*
2 * Copyright (C) 2011 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17#ifndef ANDROID_FILTERFW_CORE_GEOMETRY_H
18#define ANDROID_FILTERFW_CORE_GEOMETRY_H
19
20#include <vector>
21
22namespace android {
23namespace filterfw {
24
25// This is an initial implementation of some geometrical structures. This is
26// likely to grow and become more sophisticated in the future.
27
28class Point {
29  public:
30    Point() : x_(0.0f), y_(0.0f) {}
31    Point(float x, float y) : x_(x), y_(y) {}
32
33    float x() const { return x_; }
34    float y() const { return y_; }
35
36    float Length() const;
37    bool ScaleTo(float new_length);
38    static float Distance(const Point& p0, const Point& p1);
39
40    // Add more of these as needed:
41    Point operator+(const Point& other) const;
42    Point operator-(const Point& other) const;
43    Point operator*(float factor) const;
44
45    void Rotate90Clockwise();
46
47  private:
48    float x_, y_;
49};
50
51class Quad {
52  public:
53    Quad() : points_(4) {}
54    virtual ~Quad() {}
55
56    Quad(const Point& p0, const Point& p1, const Point& p2, const Point& p3)
57        : points_(4) {
58      points_[0] = p0;
59      points_[1] = p1;
60      points_[2] = p2;
61      points_[3] = p3;
62    }
63
64    const std::vector<Point>& points() const { return points_; }
65    const Point& point(int ix) const;
66
67  protected:
68    std::vector<Point> points_;
69};
70
71struct Rect {
72  float x, y, width, height;
73
74  Rect() {
75    x = y = 0.0f;
76    width = height = 1.0f;
77  }
78
79  Rect(float x, float y, float width, float height) {
80    this->x = x;
81    this->y = y;
82    this->width = width;
83    this->height = height;
84  }
85
86  bool ExpandToAspectRatio(float ratio);
87  bool ExpandToMinLength(float length);
88  bool ScaleWithLengthLimit(float factor, float max_length);
89};
90
91} // namespace filterfw
92} // namespace android
93
94#endif // ANDROID_FILTERFW_CORE_GEOMETRY_H
95