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General / create several instances

« on: April 19, 2019, 03:16:52 pm »

Hi guys, i'm stuck in this piece of code. I've made this array of circles, which got a dynamic outline opacity. Its should become a template for blinking lights. My question is: how can i made multiple instances of it, which appear in random places? Also feel free to play around with the code, by modifying:
PULSEPARTS, p_radius and p_outline.

#include "pch.h"
#include <SFML/Graphics.hpp>
#include <iostream>

using namespace sf;

int main()
{
        RenderWindow window(VideoMode(800, 600), "Starfield", Style::Close);
        window.setVerticalSyncEnabled(true);
        window.setFramerateLimit(60);

        // Stars ///////////////////////////////////////////////////
        int s_blink = 5;
        int s_blinkspeed = 1;

        const int PULSEPARTS = 10;
        CircleShape pulse[PULSEPARTS];

        int p_radius = 5;
        int j = 0;
        int p_outline = 1;

        int p_blink[PULSEPARTS];
        int p_blinkspeed = 1;

        // Random generator
        srand((int)time(0) * 10);
        float p_width = (rand() % 800);
        float p_height = (rand() % 600);

        for (int i = 0; i < PULSEPARTS; i++) {
                if (i == 0) {
                        pulse[i].setOutlineThickness(p_outline*=-1);
                }
                pulse[i].setRadius(p_radius + j);
                j += p_outline;
                pulse[i].setPointCount(100);
                pulse[i].setPosition(p_width, p_height);
                pulse[i].setOutlineThickness(p_outline);
                pulse[i].setOrigin(p_radius+j, p_radius+j);
                pulse[i].setFillColor(Color::Transparent);
        }
        ///////////////////////////////////////////////////////////

        while (window.isOpen())
        {
                Event event;
                while (window.pollEvent(event))
                {
                        if (event.type == Event::Closed)
                                window.close();
                }

                s_blink -= s_blinkspeed;
                if (s_blink <= 0) {
                        s_blinkspeed *= -1;
                }
                else if (s_blink >= 255) {
                        s_blinkspeed *= -1;
                }
               
                for (int i = 0; i < PULSEPARTS; i++) {
                        pulse[i].setOutlineColor(Color(255, 255, 255, i* s_blink));
                }      

                window.clear();
               
                for (int i = 0; i < PULSEPARTS; i++) {
                        window.draw(pulse[i]);
                }

                window.display();
        }

        return 0;
}