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/*
* 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.
*/
#ifndef ANDROID_FILTERFW_FILTERPACKS_BASE_GEOMETRY_H
#define ANDROID_FILTERFW_FILTERPACKS_BASE_GEOMETRY_H
#include <vector>
namespace android {
namespace filterfw {
// This is an initial implementation of some geometrical structures. This is
// likely to grow and become more sophisticated in the future.
class Point {
public:
Point() : x_(0.0f), y_(0.0f) {}
Point(float x, float y) : x_(x), y_(y) {}
float x() const { return x_; }
float y() const { return y_; }
float Length() const;
bool ScaleTo(float new_length);
static float Distance(const Point& p0, const Point& p1);
// Add more of these as needed:
Point operator+(const Point& other) const;
Point operator-(const Point& other) const;
Point operator*(float factor) const;
void Rotate90Clockwise();
private:
float x_, y_;
};
class Quad {
public:
Quad() : points_(4) {}
virtual ~Quad() {}
Quad(const Point& p0, const Point& p1, const Point& p2, const Point& p3)
: points_(4) {
points_[0] = p0;
points_[1] = p1;
points_[2] = p2;
points_[3] = p3;
}
const std::vector<Point>& points() const { return points_; }
const Point& point(int ix) const;
protected:
std::vector<Point> points_;
};
class SlantedRect : public Quad {
public:
SlantedRect() : width_(0.0f), height_(0.0f) {}
virtual ~SlantedRect() {}
bool FromCenterAxisAndLengths(const Point& center,
const Point& vert_axis,
const Point& lenghts);
float width() const { return width_; }
float height() const { return height_; }
private:
float width_;
float height_;
};
struct Rect {
float x, y, width, height;
Rect() {
x = y = 0.0f;
width = height = 1.0f;
}
Rect(float x, float y, float width, float height) {
this->x = x;
this->y = y;
this->width = width;
this->height = height;
}
bool ExpandToAspectRatio(float ratio);
bool ExpandToMinLength(float length);
bool ScaleWithLengthLimit(float factor, float max_length);
};
} // namespace filterfw
} // namespace android
#endif // ANDROID_FILTERFW_FILTERPACKS_BASE_GEOMETRY_H
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