axmol/core/math/Rect.cpp

/****************************************************************************
Copyright (c) 2010-2012 cocos2d-x.org
Copyright (c) 2013-2017 Chukong Technologies
Copyright (c) 2017-2018 Xiamen Yaji Software Co., Ltd.

https://axmolengine.github.io/

Permission is hereby granted, free of charge, to any person obtaining a copy
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****************************************************************************/

#include "math/Rect.h"

#include <algorithm>
#include <cmath>
#include "base/ccMacros.h"

// implementation of Vec2
NS_AX_BEGIN

// implementation of Rect

Rect::Rect()
{
    setRect(0.0f, 0.0f, 0.0f, 0.0f);
}

Rect::Rect(float x, float y, float width, float height)
{
    setRect(x, y, width, height);
}
Rect::Rect(const Vec2& pos, const Vec2& dimension)
{
    setRect(pos.x, pos.y, dimension.x, dimension.y);
}

Rect::Rect(const Rect& other)
{
    setRect(other.origin.x, other.origin.y, other.size.x, other.size.y);
}

Rect& Rect::operator=(const Rect& other)
{
    setRect(other.origin.x, other.origin.y, other.size.x, other.size.y);
    return *this;
}

void Rect::setRect(float x, float y, float width, float height)
{
    // CGRect can support width<0 or height<0
    // AXASSERT(width >= 0.0f && height >= 0.0f, "width and height of Rect must not less than 0.");

    origin.x = x;
    origin.y = y;

    size.x = width;
    size.y = height;
}

bool Rect::equals(const Rect& rect) const
{
    return (origin.equals(rect.origin) && size.equals(rect.size));
}

float Rect::getMaxX() const
{
    return origin.x + size.x;
}

float Rect::getMidX() const
{
    return origin.x + size.x / 2.0f;
}

float Rect::getMinX() const
{
    return origin.x;
}

float Rect::getMaxY() const
{
    return origin.y + size.y;
}

float Rect::getMidY() const
{
    return origin.y + size.y / 2.0f;
}

float Rect::getMinY() const
{
    return origin.y;
}

bool Rect::containsPoint(const Vec2& point) const
{
    bool bRet = false;

    if (point.x >= getMinX() && point.x <= getMaxX() && point.y >= getMinY() && point.y <= getMaxY())
    {
        bRet = true;
    }

    return bRet;
}

bool Rect::intersectsRect(const Rect& rect) const
{
    return !(getMaxX() < rect.getMinX() || rect.getMaxX() < getMinX() || getMaxY() < rect.getMinY() ||
             rect.getMaxY() < getMinY());
}

bool Rect::intersectsCircle(const Vec2& center, float radius) const
{
    Vec2 rectangleCenter((origin.x + size.x / 2), (origin.y + size.y / 2));

    float w = size.x / 2;
    float h = size.y / 2;

    float dx = std::abs(center.x - rectangleCenter.x);
    float dy = std::abs(center.y - rectangleCenter.y);

    if (dx > (radius + w) || dy > (radius + h))
    {
        return false;
    }

    Vec2 circleDistance(std::abs(center.x - origin.x - w), std::abs(center.y - origin.y - h));

    if (circleDistance.x <= (w))
    {
        return true;
    }

    if (circleDistance.y <= (h))
    {
        return true;
    }

    float cornerDistanceSq = powf(circleDistance.x - w, 2) + powf(circleDistance.y - h, 2);

    return (cornerDistanceSq <= (powf(radius, 2)));
}

void Rect::merge(const Rect& rect)
{
    float minX = std::min(getMinX(), rect.getMinX());
    float minY = std::min(getMinY(), rect.getMinY());
    float maxX = std::max(getMaxX(), rect.getMaxX());
    float maxY = std::max(getMaxY(), rect.getMaxY());
    setRect(minX, minY, maxX - minX, maxY - minY);
}

Rect Rect::unionWithRect(const Rect& rect) const
{
    float thisLeftX   = origin.x;
    float thisRightX  = origin.x + size.x;
    float thisTopY    = origin.y + size.y;
    float thisBottomY = origin.y;

    if (thisRightX < thisLeftX)
    {
        std::swap(thisRightX, thisLeftX);  // This rect has negative width
    }

    if (thisTopY < thisBottomY)
    {
        std::swap(thisTopY, thisBottomY);  // This rect has negative height
    }

    float otherLeftX   = rect.origin.x;
    float otherRightX  = rect.origin.x + rect.size.x;
    float otherTopY    = rect.origin.y + rect.size.y;
    float otherBottomY = rect.origin.y;

    if (otherRightX < otherLeftX)
    {
        std::swap(otherRightX, otherLeftX);  // Other rect has negative width
    }

    if (otherTopY < otherBottomY)
    {
        std::swap(otherTopY, otherBottomY);  // Other rect has negative height
    }

    float combinedLeftX   = std::min(thisLeftX, otherLeftX);
    float combinedRightX  = std::max(thisRightX, otherRightX);
    float combinedTopY    = std::max(thisTopY, otherTopY);
    float combinedBottomY = std::min(thisBottomY, otherBottomY);

    return Rect(combinedLeftX, combinedBottomY, combinedRightX - combinedLeftX, combinedTopY - combinedBottomY);
}

const Rect Rect::ZERO = Rect(0, 0, 0, 0);

NS_AX_END