ParticleArray - Particle.cpp

#include "Particle.h"

void Particle::setup(ofVec2f _position){
    position = _position;
}

void Particle::draw(){
    ofSetHexColor(0x3399cc);
    ofCircle(position, 10);
}

ParticleArray - Particle.h

#pragma once
#include "ofMain.h"

class Particle {

public:

    ofVec2f position;
    void setup(ofVec2f position);
    void draw();
};

ParticleArray - testApp.cpp

#include "testApp.h"

//--------------------------------------------------------------
void testApp::setup(){
    // 画面基本設定
    ofSetFrameRate(60);
    ofBackground(63);
    
    for(int i = 0; i < NUM; i++){
        float posX = ofRandom(ofGetWidth());
        float posY = ofRandom(ofGetHeight());
        particle[i].setup(ofVec2f(posX, posY));
    }
}

//--------------------------------------------------------------
void testApp::update(){

}

//--------------------------------------------------------------
void testApp::draw(){
    // 設定した場所に円を描く
    for(int i = 0; i < NUM; i++){
        particle[i].draw();
    }
}

ParticleArray - testApp.h

#pragma once

#include "ofMain.h"
#include "Particle.h"

class testApp : public ofBaseApp{
    
public:
    void setup();
    void update();
    void draw();
    
    void keyPressed(int key);
    void keyReleased(int key);
    void mouseMoved(int x, int y );
    void mouseDragged(int x, int y, int button);
    void mousePressed(int x, int y, int button);
    void mouseReleased(int x, int y, int button);
    void windowResized(int w, int h);
    void dragEvent(ofDragInfo dragInfo);
    void gotMessage(ofMessage msg);
    
    static const int NUM = 100;
    Particle particle[NUM];
};