ace_ace_engine/frameworks/base/geometry/offset.h

/*
 * Copyright (c) 2021 Huawei Device Co., Ltd.
 * 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 FOUNDATION_ACE_FRAMEWORKS_BASE_GEOMETRY_OFFSET_H
#define FOUNDATION_ACE_FRAMEWORKS_BASE_GEOMETRY_OFFSET_H

#include <cmath>
#include <limits>

#include "base/geometry/size.h"
#include "base/utils/utils.h"

namespace OHOS::Ace {

class Offset {
public:
    Offset() = default;
    ~Offset() = default;
    Offset(double deltaX, double deltaY) : deltaX_(deltaX), deltaY_(deltaY) {}

    void Reset()
    {
        deltaX_ = 0.0;
        deltaY_ = 0.0;
    }

    static Offset Zero()
    {
        return Offset();
    }

    static Offset ErrorOffset()
    {
        return Offset((std::numeric_limits<double>::max)(), (std::numeric_limits<double>::max)());
    }

    bool IsZero() const
    {
        return operator==(Offset());
    }

    bool IsErrorOffset() const
    {
        return operator==(ErrorOffset());
    }

    double GetX() const
    {
        return deltaX_;
    }

    double GetY() const
    {
        return deltaY_;
    }

    void SetX(double x)
    {
        deltaX_ = x;
    }

    void SetY(double y)
    {
        deltaY_ = y;
    }

    double GetDistance() const
    {
        return std::sqrt((deltaX_ * deltaX_) + (deltaY_ * deltaY_));
    }

    Offset operator+(const Offset& offset) const
    {
        return Offset(deltaX_ + offset.deltaX_, deltaY_ + offset.deltaY_);
    }

    Offset operator+(const Size& size) const
    {
        return Offset(deltaX_ + size.Width(), deltaY_ + size.Height());
    }

    Offset operator-(const Offset& offset) const
    {
        return Offset(deltaX_ - offset.deltaX_, deltaY_ - offset.deltaY_);
    }

    Offset operator*(double value) const
    {
        return Offset(deltaX_ * value, deltaY_ * value);
    }

    Offset operator/(double value) const
    {
        if (NearZero(value)) {
            return ErrorOffset();
        }
        return Offset(deltaX_ / value, deltaY_ / value);
    }

    Offset& operator+=(const Offset& offset)
    {
        deltaX_ += offset.deltaX_;
        deltaY_ += offset.deltaY_;
        return *this;
    }

    bool operator==(const Offset& offset) const
    {
        return NearEqual(deltaX_, offset.deltaX_) && NearEqual(deltaY_, offset.deltaY_);
    }

    bool operator!=(const Offset& offset) const
    {
        return !operator==(offset);
    }

    std::string ToString() const
    {
        return std::string("Offset (")
            .append(std::to_string(deltaX_))
            .append(", ")
            .append(std::to_string(deltaY_))
            .append(")");
    }

    bool IsPositiveOffset() const
    {
        return deltaX_ >= 0 && deltaY_ >= 0;
    }

private:
    double deltaX_ = 0.0;
    double deltaY_ = 0.0;
};

} // namespace OHOS::Ace

#endif // FOUNDATION_ACE_FRAMEWORKS_BASE_GEOMETRY_OFFSET_H