How do I make a convex shape infinitely rotate in SFML - rotation

Question

I am making a game where I need a player to be constantly rotating. I have tried using a vertex array instead of a convex shape so that I could use trig to move the points around (which was shown to me in a tutorial), but it does not load my texture correctly. The player is a triangle and when I try to load the texture to the vertex array it displays it as completely black, and I want it to actually load my texture. when I used a convex shape, it did load the texture correctly, but I don't know how I'm going to make it rotate. I would prefer to use a convex shape since for me it's easier to work with.
#include <SFML/Graphics.hpp>
#include <math.h>
#include <stdlib.h>
int main()
{
sf::RenderWindow window(sf::VideoMode(800,800), "High noon showdown", sf::Style::Close | sf::Style::Titlebar);
sf::Texture p1texture;
p1texture.loadFromFile("2nd hns bandit.png");
sf::ConvexShape p1;
p1.setPointCount(3);
p1.setTexture(&p1texture);
//points for player 1
p1.setPoint(0, sf::Vector2f(70.0f, 380.0f));
p1.setPoint(1, sf::Vector2f(30.0f, 380.0f));
p1.setPoint(2, sf::Vector2f(30.0f, 310.0f));
//game loop
while(window.isOpen()) {
sf::Event evnt;
while(window.pollEvent(evnt)) {
switch(evnt.type){
case sf::Event::Closed:
window.close();
break;
}
}
window.clear(sf::Color(210,180,140,100));
window.draw(p1);
window.display();
}
return 0;
}