End point code for Week 6

App.cpp

#include "ofApp.h"

#define NUM_PARTICLES 100

class Particle {
public:
    void setup(ofPoint _pos, ofPoint _vel) {
        pos = _pos;
        vel = _vel;
    }
    
    void update() {
        pos += vel;
        alpha *= 0.99;
        
        if(pos.x > ofGetWidth()-radius) {
            pos.x = ofGetWidth()-radius;
            vel.x *= -1;
        }
        if(pos.y > ofGetHeight()-radius) {
            pos.y = ofGetHeight()-radius;
            vel.y *= -1;
        }
        if(pos.x < radius) {
            pos.x = radius;
            vel.x *= -1;
        }
        if(pos.y < radius) {
            pos.y = radius;
            vel.y *= -1;
        }
    }
    
    void draw() {
        ofSetColor(0, alpha);
        ofDrawCircle(pos, radius);
    }
    
    float radius = 5;
    ofPoint pos;
    ofPoint vel;
    float alpha = 255;
};

vector<Particle> particles;
ofPoint lastMousePos;

//--------------------------------------------------------------
void ofApp::setup(){

}

//--------------------------------------------------------------
void ofApp::update(){
    
    for(int i=particles.size()-1; i>=0; i--) {
        particles[i].update();
        
        if(particles[i].alpha < 1) {
            particles.erase(particles.begin()+i);
        }
    }
}

//--------------------------------------------------------------
void ofApp::draw(){
    
    for(int i=0; i<particles.size(); i++) {
        particles[i].draw();

    }
    
    ofSetColor(0);
    ofDrawBitmapString(ofToString(particles.size()) + "\n" + ofToString(ofGetFrameRate()), 10, 20);
}

//--------------------------------------------------------------
void ofApp::keyPressed(int key){

}

//--------------------------------------------------------------
void ofApp::keyReleased(int key){

}

//--------------------------------------------------------------
void ofApp::mouseMoved(int x, int y ){
    
}

//--------------------------------------------------------------
void ofApp::mouseDragged(int x, int y, int button){
    
    
    ofPoint pos(x,y);

    ofPoint vel = pos-lastMousePos;
    vel.limit(5);
    vel.x += ofRandom(-4, 4);
    vel.y += ofRandom(-4, 4);
   
    Particle p;
    p.setup( pos, vel );

    particles.push_back( p );
    
    lastMousePos.set(x,y);
}

//--------------------------------------------------------------
void ofApp::mousePressed(int x, int y, int button){

}

//--------------------------------------------------------------
void ofApp::mouseReleased(int x, int y, int button){

}

//--------------------------------------------------------------
void ofApp::mouseEntered(int x, int y){

}

//--------------------------------------------------------------
void ofApp::mouseExited(int x, int y){

}

//--------------------------------------------------------------
void ofApp::windowResized(int w, int h){

}

//--------------------------------------------------------------
void ofApp::gotMessage(ofMessage msg){

}

//--------------------------------------------------------------
void ofApp::dragEvent(ofDragInfo dragInfo){ 

}