ball collision!?

/*
 * Ball.cpp
 *
 *  Created on: Nov 21, 2014
 *      Author: Austin
 *
 * Creates ball texture, when goes out of bounds, restarts back at center, launches in a random direction, collides with
 * bottom and top of window with the opposite direction of velocity.
 */
#include <iostream>
#include <ctime>
#include <stdlib.h>
#include <SDL_image.h>
using namespace std;
#include "Ball.h"

Ball::Ball(SDL_Renderer *renderBall, string filePath, int x, int y)
{
	SDL_Surface *surface = IMG_Load(filePath.c_str());
	if(surface == NULL)
		cout << "Error ball surface" << endl;
	else
	{
		texture = SDL_CreateTextureFromSurface(renderBall, surface);
		if(texture == NULL)
			cout << "Error ball texture" << endl;
	}

	SDL_FreeSurface(surface);

	ballRect.x = x;
	ballRect.y = y;

	posRect.w = 14;
	posRect.h = 14;

	ballRect.w = posRect.w;
	ballRect.h = posRect.h;

	xVel = -1;
	yVel = 3;

	SDL_QueryTexture(texture, NULL, NULL, &posRect.w, &posRect.h);
}

void Ball::UpdateBall(float delta)
{
	//Ball::RandomNumber = srand(time(NULL));
	//Collision detection

	ballRect.x += xVel;
	ballRect.y += yVel;

	if(ballRect.y < 0)
		yVel = -yVel;
	if(ballRect.y > 586)
		yVel = -yVel;

	if(ballRect.x + ballRect.w > posRect.x && ballRect.x < posRect.x + posRect.w)
	{
		if(ballRect.y + ballRect.h > posRect.y && ballRect.y < posRect.y + posRect.w)
		{
			xVel = -xVel;
		}
	}
}

Ball::~Ball()
{
	SDL_DestroyTexture(texture);
}

int GetRandomNumber(int high, int low)
{
	return rand() % high + low;
}

void Ball::Draw(SDL_Renderer *renderBall)
{
	SDL_RenderCopy(renderBall, texture, NULL, &ballRect);
}