C++ and SFML, no instance of the overloaded function "sf::RenderWindow.draw()" matches the argument list - c++

Question

I am currently trying to make a simple pong game with SFML in C++. I consistently get the error in the main file.
#include <iostream>
#include "Ball.h"
Ball b;
int main()
{
// create the window
sf::RenderWindow window(sf::VideoMode(1200, 600), "My window");
// run the program as long as the window is open
while (window.isOpen())
{
// check all the window's events that were triggered since the last iteration of the loop
sf::Event event;
while (window.pollEvent(event))
{
// "close requested" event: we close the window
if (event.type == sf::Event::Closed)
window.close();
}
// clear the window with black color
window.clear(sf::Color::Black);
// draw everything here...
window.draw(b);
// end the current frame
window.display();
}
return 0;
}
This is the ball.h file:
#pragma once
#include <iostream>
#include <SFML/Window.hpp>
#include <SFML/Graphics.hpp>
class Ball
{
public:
double x, y;
int Radius;
void Render(int Rad, sf::Color BallColour) {
sf::CircleShape shape(Rad);
// set the shape color to green
shape.setFillColor(BallColour);
}
};
I am unsure as to why the error occurs. Any help would be appreciated.

Answer 1

You had not call function of render, you just wrote window.draw(b), and programm dont know what do you mean. In Ball.h you should write:
#pragma once
#include <iostream>
#include <SFML/Window.hpp>
#include <SFML/Graphics.hpp>
class Ball
{
public:
double x, y;
int Radius;
void Render(int Rad, RenderWindow& window) {
sf::CircleShape shape(Rad);
// set the shape color to green
shape.setFillColor(sf::Color::Green);
shape.setPosition(600, 300);//SETTING POSITION OF THE BALL
window.draw(shape);//if you know what is reference on variable, you will understand what is it
}
};
And in your main.cpp you shhould call your function Render:
#include <iostream>
#include "Ball.h"
int main()
{
// create the window
sf::RenderWindow window(sf::VideoMode(1200, 600), "My window");
Ball b; //I advice you to create object of class in main function
// run the program as long as the window is open
while (window.isOpen())
{
// check all the window's events that were triggered since the last iteration of the loop
sf::Event event;
while (window.pollEvent(event))
{
// "close requested" event: we close the window
if (event.type == sf::Event::Closed)
window.close();
}
// clear the window with black color
window.clear(sf::Color::Black);
b.Render(10, window);// give the function reference on window
// end the current frame
window.display();
}
return 0;
}

Answer 2

sf::RenderWindow::draw requires an implementation of sf::Drawable. You can either pass sf::CircleShape (it's a sf::Drawable) directly or implement sf::Drawable and delegate the call.
class Ball : public sf::Drawable {
public:
double x, y;
int Radius;
void draw(sf::RenderTarget& target, sf::RenderStates states) const override {
sf::CircleShape shape(Radius);
shape.setFillColor(BallColour);
shape.draw(target, states);
}
};