axmol/tests/cpp-tests/Classes/TouchesTest/Ball.cpp

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 Copyright (c) 2017-2018 Xiamen Yaji Software Co., Ltd.

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#include "Ball.h"
#include "Paddle.h"
#include "../VisibleRect.h"

USING_NS_CC;

Ball::Ball() {}

Ball::~Ball() {}

float Ball::radius()
{
    return getTexture()->getContentSize().width / 2;
}

Ball* Ball::ballWithTexture(Texture2D* aTexture)
{
    Ball* pBall = new Ball();
    pBall->initWithTexture(aTexture);
    pBall->autorelease();

    return pBall;
}

void Ball::move(float delta)
{
    this->setPosition(getPosition() + _velocity * delta);

    if (getPosition().x > VisibleRect::right().x - radius())
    {
        setPosition(VisibleRect::right().x - radius(), getPosition().y);
        _velocity.x *= -1;
    }
    else if (getPosition().x < VisibleRect::left().x + radius())
    {
        setPosition(VisibleRect::left().x + radius(), getPosition().y);
        _velocity.x *= -1;
    }
}

void Ball::collideWithPaddle(Paddle* paddle)
{
    auto paddleRect = paddle->getRect();
    paddleRect.origin.x += paddle->getPosition().x;
    paddleRect.origin.y += paddle->getPosition().y;

    float lowY  = paddleRect.getMinY();
    float midY  = paddleRect.getMidY();
    float highY = paddleRect.getMaxY();

    float leftX  = paddleRect.getMinX();
    float rightX = paddleRect.getMaxX();

    if (getPosition().x > leftX && getPosition().x < rightX)
    {

        bool hit          = false;
        float angleOffset = 0.0f;

        if (getPosition().y > midY && getPosition().y <= highY + radius())
        {
            setPosition(getPosition().x, highY + radius());
            hit         = true;
            angleOffset = (float)M_PI / 2;
        }
        else if (getPosition().y < midY && getPosition().y >= lowY - radius())
        {
            setPosition(getPosition().x, lowY - radius());
            hit         = true;
            angleOffset = -(float)M_PI / 2;
        }

        if (hit)
        {
            float hitAngle = (paddle->getPosition() - getPosition()).getAngle() + angleOffset;

            float scalarVelocity = _velocity.getLength() * 1.05f;
            float velocityAngle  = -_velocity.getAngle() + 0.5f * hitAngle;

            _velocity = Vec2::forAngle(velocityAngle) * scalarVelocity;
        }
    }
}