2018年8月 – ページ 8 – プログラミング de 落描き

2018年8月10日2018年8月10日

Sound by Perlin Noise. openframeworks

[ Video ]

[ About ]
パーティクルの座標をパーリンノイズを使って変化、パーティクルは周期的に音を発しますが、X座標によって音階が変わります。

The particle changes position by Perlin Noise, and the sound changes depending on X coordinate.

[ Source ]

#pragma once
#include "ofMain.h"

class ofApp : 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 mouseEntered(int x, int y) {};
	void mouseExited(int x, int y) {};
	void windowResized(int w, int h) {};
	void dragEvent(ofDragInfo dragInfo) {};
	void gotMessage(ofMessage msg) {};

	vector<ofSoundPlayer> sounds;
};

#pragma once

#include "ofMain.h"

class ofApp : 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 mouseEntered(int x, int y) {};

void mouseExited(int x, int y) {};

void windowResized(int w, int h) {};

void dragEvent(ofDragInfo dragInfo) {};

void gotMessage(ofMessage msg) {};

vector<ofSoundPlayer> sounds;

};

#include "ofApp.h"

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

	ofSetFrameRate(60);
	ofSetWindowTitle("Insta");

	ofSetColor(239);
	ofBackground(39);
	ofSetBackgroundAuto(false);
	ofSetLineWidth(3);

	string sound_path_list[] = { "sound/pianoC.mp3", "sound/pianoD.mp3", "sound/pianoE.mp3", "sound/pianoF.mp3", "sound/pianoG.mp3", "sound/pianoA.mp3", "sound/pianoB.mp3", "sound/pianoC2.mp3" };
	for (int i = 0; i < 8; i++) {

		ofSoundPlayer sound;
		sound.load(sound_path_list[i]);
		sound.setVolume(0.2);
		sound.setMultiPlay(true);

		this->sounds.push_back(sound);
	}
}

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

	ofSoundUpdate();
}

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

	ofSetColor(39, 64);
	ofDrawRectangle(0, 0, ofGetWidth(), ofGetHeight());
	ofSetColor(239);

	for (int i = 1; i <= 6; i++) {

		float noise_value = ofNoise(i, ofGetFrameNum() * 0.005);
		ofPoint point = ofPoint(noise_value * ofGetWidth(), i * 102);
		ofFill();
		ofDrawCircle(point, 30);
		
		if (ofGetFrameNum() % (i * 15) == 0) {

			int index = noise_value * 8;
			this->sounds[index].play();

			ofNoFill();
			ofDrawCircle(point, 50);
		}
	}
}

//--------------------------------------------------------------
int main() {

	ofSetupOpenGL(720, 720, OF_WINDOW);
	ofRunApp(new ofApp());
}

#include "ofApp.h"

//--------------------------------------------------------------

void ofApp::setup() {

ofSetFrameRate(60);

ofSetWindowTitle("Insta");

ofSetColor(239);

ofBackground(39);

ofSetBackgroundAuto(false);

ofSetLineWidth(3);

string sound_path_list[] = { "sound/pianoC.mp3", "sound/pianoD.mp3", "sound/pianoE.mp3", "sound/pianoF.mp3", "sound/pianoG.mp3", "sound/pianoA.mp3", "sound/pianoB.mp3", "sound/pianoC2.mp3" };

for (int i = 0; i < 8; i++) {

ofSoundPlayer sound;

sound.load(sound_path_list[i]);

sound.setVolume(0.2);

sound.setMultiPlay(true);

this->sounds.push_back(sound);

}

//--------------------------------------------------------------

void ofApp::update() {

ofSoundUpdate();

}

//--------------------------------------------------------------

void ofApp::draw() {

ofSetColor(39, 64);

ofDrawRectangle(0, 0, ofGetWidth(), ofGetHeight());

ofSetColor(239);

for (int i = 1; i <= 6; i++) {

float noise_value = ofNoise(i, ofGetFrameNum() * 0.005);

ofPoint point = ofPoint(noise_value * ofGetWidth(), i * 102);

ofFill();

ofDrawCircle(point, 30);

if (ofGetFrameNum() % (i * 15) == 0) {

int index = noise_value * 8;

this->sounds[index].play();

ofNoFill();

ofDrawCircle(point, 50);

}

//--------------------------------------------------------------

int main() {

ofSetupOpenGL(720, 720, OF_WINDOW);

ofRunApp(new ofApp());

}

[ Link ]
https://github.com/junkiyoshi/Insta20180810

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2018年8月9日2018年8月9日

Physics And Sound. openframeworks

[ Video ]

[ About ]
♪ 物理エンジンを使ったピアノ演奏

♪ Play piano by physics engine.

[ Source ]

#pragma once
#include "ofMain.h"
#include "ofxBox2d.h"

#include "Particle.h"
#include "Obstruct.h"

class ofApp : 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 mouseEntered(int x, int y) {}
	void mouseExited(int x, int y) {}
	void windowResized(int w, int h) {}
	void dragEvent(ofDragInfo dragInfo) {}
	void gotMessage(ofMessage msg) {}

	void contactStart(ofxBox2dContactArgs &e);
	void contactEnd(ofxBox2dContactArgs &e);

	ofxBox2d box2d;
	vector<unique_ptr<Particle>> particles;
	vector<unique_ptr<Obstruct>> obstructs;
};

#pragma once

#include "ofMain.h"

#include "ofxBox2d.h"

#include "Particle.h"

#include "Obstruct.h"

class ofApp : 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 mouseEntered(int x, int y) {}

void mouseExited(int x, int y) {}

void windowResized(int w, int h) {}

void dragEvent(ofDragInfo dragInfo) {}

void gotMessage(ofMessage msg) {}

void contactStart(ofxBox2dContactArgs &e);

void contactEnd(ofxBox2dContactArgs &e);

ofxBox2d box2d;

vector<unique_ptr<Particle>> particles;

vector<unique_ptr<Obstruct>> obstructs;

};

#include "ofApp.h"

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

	ofSetFrameRate(60);
	ofSetWindowTitle("openFrameworks");

	ofBackground(239);

	this->box2d.init();
	this->box2d.enableEvents();
	this->box2d.setGravity(0, 15);
	this->box2d.createBounds();
	this->box2d.setFPS(60);
	this->box2d.registerGrabbing();

	ofAddListener(box2d.contactStartEvents, this, &ofApp::contactStart);
	ofAddListener(box2d.contactEndEvents, this, &ofApp::contactEnd);

	string sound_path_list[] = {"sound/pianoC.mp3", "sound/pianoD.mp3", "sound/pianoE.mp3", "sound/pianoF.mp3", "sound/pianoG.mp3", "sound/pianoA.mp3", "sound/pianoB.mp3", "sound/pianoC2.mp3"};
	for (int i = 0; i < 8; i++) {

		unique_ptr<Obstruct> ob(new Obstruct(this->box2d, ofPoint(ofGetWidth() * 0.125 * i + ofGetWidth() * 0.0625 , ofGetHeight() * 0.50), 50, 50, i * 28));
		ob->SetSound(sound_path_list[i]);
		this->obstructs.push_back(std::move(ob));
	}
}

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

	if (ofGetFrameNum() % 10 == 0) {

		ofPoint point(ofRandom(ofGetWidth()), 10);
		float radius = 8;
		unique_ptr<Particle> p(new Particle(this->box2d, point, radius));

		this->particles.push_back(std::move(p));
	}

	for (int i = this->particles.size() - 1; i >= 0; i--) {

		this->particles[i]->Update();
		if (this->particles[i]->IsDead()) {

			this->particles.erase(this->particles.begin() + i);
		}
	}

	for (int i = 0; i < this->obstructs.size(); i++) {

		this->obstructs[i]->Update();
	}

	this->box2d.update();
	ofSoundUpdate();
}

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

	for (int i = 0; i < this->obstructs.size(); i++) {

		this->obstructs[i]->Draw();
	}

	for (int i = 0; i < this->particles.size(); i++) {

		this->particles[i]->Draw();
	}
}

//--------------------------------------------------------------
void ofApp::contactStart(ofxBox2dContactArgs &e) {

	if (e.a != NULL && e.b != NULL) {

		if (e.a->GetType() == b2Shape::e_circle && e.b->GetType() == b2Shape::e_circle) {

			Particle* p_a = (Particle*)e.a->GetBody()->GetUserData();
			Particle* p_b = (Particle*)e.b->GetBody()->GetUserData();
			if (p_a != nullptr && p_b != nullptr) {

				// Particle Collide
			}

			return;
		}

		if (e.a->GetType() == b2Shape::e_polygon && e.b->GetType() == b2Shape::e_circle) {

			Obstruct* o_a = (Obstruct*)e.a->GetBody()->GetUserData();
			Particle* p_b = (Particle*)e.b->GetBody()->GetUserData();
			if (o_a != nullptr && p_b != nullptr) {

				p_b->SetColor(o_a->GetColor());
				o_a->SoundPlay();
			}

			return;
		}

		if (e.a->GetType() == b2Shape::e_circle && e.b->GetType() == b2Shape::e_polygon) {

			Particle* p_a = (Particle*)e.a->GetBody()->GetUserData();
			Obstruct* o_b = (Obstruct*)e.b->GetBody()->GetUserData();
			if (p_a != nullptr && o_b != nullptr) {

				p_a->SetColor(o_b->GetColor());
				o_b->SoundPlay();
			}

			return;
		}
	}
}

//--------------------------------------------------------------
void ofApp::contactEnd(ofxBox2dContactArgs &e) {

	if (e.a != NULL && e.b != NULL) {

		// do nothing
	}
}

//--------------------------------------------------------------
int main() {

	ofSetupOpenGL(720, 720, OF_WINDOW);
	ofRunApp(new ofApp());
}

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#include "ofApp.h"

//--------------------------------------------------------------

void ofApp::setup() {

ofSetFrameRate(60);

ofSetWindowTitle("openFrameworks");

ofBackground(239);

this->box2d.init();

this->box2d.enableEvents();

this->box2d.setGravity(0, 15);

this->box2d.createBounds();

this->box2d.setFPS(60);

this->box2d.registerGrabbing();

ofAddListener(box2d.contactStartEvents, this, &ofApp::contactStart);

ofAddListener(box2d.contactEndEvents, this, &ofApp::contactEnd);

string sound_path_list[] = {"sound/pianoC.mp3", "sound/pianoD.mp3", "sound/pianoE.mp3", "sound/pianoF.mp3", "sound/pianoG.mp3", "sound/pianoA.mp3", "sound/pianoB.mp3", "sound/pianoC2.mp3"};

for (int i = 0; i < 8; i++) {

unique_ptr<Obstruct> ob(new Obstruct(this->box2d, ofPoint(ofGetWidth() * 0.125 * i + ofGetWidth() * 0.0625 , ofGetHeight() * 0.50), 50, 50, i * 28));

ob->SetSound(sound_path_list[i]);

this->obstructs.push_back(std::move(ob));

}

//--------------------------------------------------------------

void ofApp::update() {

if (ofGetFrameNum() % 10 == 0) {

ofPoint point(ofRandom(ofGetWidth()), 10);

float radius = 8;

unique_ptr<Particle> p(new Particle(this->box2d, point, radius));

this->particles.push_back(std::move(p));

}

for (int i = this->particles.size() - 1; i >= 0; i--) {

this->particles[i]->Update();

if (this->particles[i]->IsDead()) {

this->particles.erase(this->particles.begin() + i);

}

for (int i = 0; i < this->obstructs.size(); i++) {

this->obstructs[i]->Update();

}

this->box2d.update();

ofSoundUpdate();

}

//--------------------------------------------------------------

void ofApp::draw() {

for (int i = 0; i < this->obstructs.size(); i++) {

this->obstructs[i]->Draw();

}

for (int i = 0; i < this->particles.size(); i++) {

this->particles[i]->Draw();

}

//--------------------------------------------------------------

void ofApp::contactStart(ofxBox2dContactArgs &e) {

if (e.a != NULL && e.b != NULL) {

if (e.a->GetType() == b2Shape::e_circle && e.b->GetType() == b2Shape::e_circle) {

Particle* p_a = (Particle*)e.a->GetBody()->GetUserData();

Particle* p_b = (Particle*)e.b->GetBody()->GetUserData();

if (p_a != nullptr && p_b != nullptr) {

// Particle Collide

}

return;

}

if (e.a->GetType() == b2Shape::e_polygon && e.b->GetType() == b2Shape::e_circle) {

Obstruct* o_a = (Obstruct*)e.a->GetBody()->GetUserData();

Particle* p_b = (Particle*)e.b->GetBody()->GetUserData();

if (o_a != nullptr && p_b != nullptr) {

p_b->SetColor(o_a->GetColor());

o_a->SoundPlay();

}

return;

}

if (e.a->GetType() == b2Shape::e_circle && e.b->GetType() == b2Shape::e_polygon) {

Particle* p_a = (Particle*)e.a->GetBody()->GetUserData();

Obstruct* o_b = (Obstruct*)e.b->GetBody()->GetUserData();

if (p_a != nullptr && o_b != nullptr) {

p_a->SetColor(o_b->GetColor());

o_b->SoundPlay();

}

return;

}

//--------------------------------------------------------------

void ofApp::contactEnd(ofxBox2dContactArgs &e) {

if (e.a != NULL && e.b != NULL) {

// do nothing

}

//--------------------------------------------------------------

int main() {

ofSetupOpenGL(720, 720, OF_WINDOW);

ofRunApp(new ofApp());

}

#pragma once
#include "ofMain.h"
#include "ofxBox2d.h"

class Obstruct
{
public:

	Obstruct(ofxBox2d& box2d, ofPoint point, float width, float height, float fue);
	~Obstruct();

	void Update();
	void Draw();
	void SoundPlay();

	void SetSound(string soude_path);
	ofColor GetColor();
private:

	ofxBox2dRect* rect = nullptr;
	ofColor color;
	ofSoundPlayer sound;
	vector<float> waves;
};

#pragma once

#include "ofMain.h"

#include "ofxBox2d.h"

class Obstruct

{

public:

Obstruct(ofxBox2d& box2d, ofPoint point, float width, float height, float fue);

~Obstruct();

void Update();

void Draw();

void SoundPlay();

void SetSound(string soude_path);

ofColor GetColor();

private:

ofxBox2dRect* rect = nullptr;

ofColor color;

ofSoundPlayer sound;

vector<float> waves;

};

#include "Obstruct.h"

Obstruct::Obstruct(ofxBox2d& box2d, ofPoint point, float width, float height, float hue)
{
	this->rect = new ofxBox2dRect();
	this->rect->setPhysics(0.0, 1.0, 1.0);
	this->rect->setup(box2d.getWorld(), point.x , point.y, width, height);
	this->rect->setData(this);

	this->color.setHsb(hue, 255, 230);
}

Obstruct::~Obstruct()
{
	if (this->rect != nullptr) {

		this->rect->destroy();
		delete this->rect;
	}
}

void Obstruct::Update() {

	for (int i = this->waves.size() - 1; i >= 0; i -= 1) {

		this->waves[i] += 1;
		if (this->waves[i] > 60) {

			this->waves.erase(this->waves.begin() + i);
		}
	}
}

void Obstruct::Draw() {

	float width = this->rect->getWidth();
	float height = this->rect->getHeight();

	ofFill();
	ofSetColor(this->color);
	ofDrawRectangle(this->rect->getPosition() + ofPoint(width * -0.5, height * -0.5) , width, height);

	for (int i = 0; i < this->waves.size(); i++) {

		ofNoFill();
		ofSetColor(this->color, ofMap(this->waves[i], 0, 60, 255, 0));
	
		float wave_width = width + waves[i];
		float wave_height = height + waves[i];

		ofDrawRectangle(this->rect->getPosition() + ofPoint(wave_width * -0.5, wave_height * -0.5), wave_width, wave_height);
	}
}

void Obstruct::SoundPlay() {

	this->sound.play();
	this->waves.push_back(0);
}

// Setter
void Obstruct::SetSound(string sound_path) {

	this->sound.load(sound_path);
	this->sound.setVolume(0.5);
	this->sound.setMultiPlay(true);
}

// Getter
ofColor Obstruct::GetColor() { return this->color; }

#include "Obstruct.h"

Obstruct::Obstruct(ofxBox2d& box2d, ofPoint point, float width, float height, float hue)

{

this->rect = new ofxBox2dRect();

this->rect->setPhysics(0.0, 1.0, 1.0);

this->rect->setup(box2d.getWorld(), point.x , point.y, width, height);

this->rect->setData(this);

this->color.setHsb(hue, 255, 230);

}

Obstruct::~Obstruct()

{

if (this->rect != nullptr) {

this->rect->destroy();

delete this->rect;

}

void Obstruct::Update() {

for (int i = this->waves.size() - 1; i >= 0; i -= 1) {

this->waves[i] += 1;

if (this->waves[i] > 60) {

this->waves.erase(this->waves.begin() + i);

}

void Obstruct::Draw() {

float width = this->rect->getWidth();

float height = this->rect->getHeight();

ofFill();

ofSetColor(this->color);

ofDrawRectangle(this->rect->getPosition() + ofPoint(width * -0.5, height * -0.5) , width, height);

for (int i = 0; i < this->waves.size(); i++) {

ofNoFill();

ofSetColor(this->color, ofMap(this->waves[i], 0, 60, 255, 0));

float wave_width = width + waves[i];

float wave_height = height + waves[i];

ofDrawRectangle(this->rect->getPosition() + ofPoint(wave_width * -0.5, wave_height * -0.5), wave_width, wave_height);

}

void Obstruct::SoundPlay() {

this->sound.play();

this->waves.push_back(0);

}

// Setter

void Obstruct::SetSound(string sound_path) {

this->sound.load(sound_path);

this->sound.setVolume(0.5);

this->sound.setMultiPlay(true);

}

// Getter

ofColor Obstruct::GetColor() { return this->color; }

#pragma once
#include "ofMain.h"
#include "ofxBox2d.h"

class Particle
{
public:

	Particle(ofxBox2d& box2d, ofPoint point, float radius);
	~Particle();

	void Update();
	void Draw();

	void SetColor(ofColor color);
	ofColor GetColor();
	ofPoint GetVelocity();
	bool IsDead();
private:

	ofxBox2dCircle* circle = nullptr;
	ofColor color;
	float life;
};

#pragma once

#include "ofMain.h"

#include "ofxBox2d.h"

class Particle

{

public:

Particle(ofxBox2d& box2d, ofPoint point, float radius);

~Particle();

void Update();

void Draw();

void SetColor(ofColor color);

ofColor GetColor();

ofPoint GetVelocity();

bool IsDead();

private:

ofxBox2dCircle* circle = nullptr;

ofColor color;

float life;

};

#include "Particle.h"

Particle::Particle(ofxBox2d& box2d, ofPoint point, float radius)
{
	this->circle = new ofxBox2dCircle();
	this->circle->setPhysics(1.0, 0.3, 1.0);
	this->circle->setup(box2d.getWorld(), point.x, point.y, radius);
	this->circle->setData(this);

	this->color = ofColor(39);
	this->life = 255;
}

Particle::~Particle()
{
	if (this->circle != nullptr) {

		this->circle->destroy();
		delete this->circle;
	}
}

void Particle::Update() {

	this->life -= 1.5;
}

void Particle::Draw() {

	ofFill();
	ofSetColor(this->color, this->life > 64 ? 255 : ofMap(this->life, 0, 64, 0, 255));
	ofDrawCircle(this->circle->getPosition(), this->circle->getRadius());
}

// Setter 
void Particle::SetColor(ofColor color) { this->color = color; }

// Getter
ofColor Particle::GetColor() { return this->color; }
ofPoint Particle::GetVelocity() { return this->circle->getVelocity(); }
bool Particle::IsDead() { return this->life <= 0 ? true : false; }

#include "Particle.h"

Particle::Particle(ofxBox2d& box2d, ofPoint point, float radius)

{

this->circle = new ofxBox2dCircle();

this->circle->setPhysics(1.0, 0.3, 1.0);

this->circle->setup(box2d.getWorld(), point.x, point.y, radius);

this->circle->setData(this);

this->color = ofColor(39);

this->life = 255;

}

Particle::~Particle()

{

if (this->circle != nullptr) {

this->circle->destroy();

delete this->circle;

}

void Particle::Update() {

this->life -= 1.5;

}

void Particle::Draw() {

ofFill();

ofSetColor(this->color, this->life > 64 ? 255 : ofMap(this->life, 0, 64, 0, 255));

ofDrawCircle(this->circle->getPosition(), this->circle->getRadius());

}

// Setter

void Particle::SetColor(ofColor color) { this->color = color; }

// Getter

ofColor Particle::GetColor() { return this->color; }

ofPoint Particle::GetVelocity() { return this->circle->getVelocity(); }

bool Particle::IsDead() { return this->life <= 0 ? true : false; }

[ Link ]
https://github.com/junkiyoshi/Insta20180809

[ほしいものリスト]
Amazon

[ Sponsor Link ]

2018年8月8日2018年8月8日

Rain of Particles. openframeworks

[ Video ]

[ About ]
パーティクル同士が衝突すると、速度の高い方の色が伝達して変化します。物理エンジンはofxBox2dを使ってます。

When particles collide with each other, color change to color of faster particle. I use physics engine is ofxBox2d.

[ Source ]

#pragma once
#include "ofMain.h"
#include "ofxBox2d.h"

#include "Particle.h"

class ofApp : 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 mouseEntered(int x, int y) {}
	void mouseExited(int x, int y) {}
	void windowResized(int w, int h) {}
	void dragEvent(ofDragInfo dragInfo) {}
	void gotMessage(ofMessage msg) {}

	void contactStart(ofxBox2dContactArgs &e);
	void contactEnd(ofxBox2dContactArgs &e);

	ofxBox2d box2d;
	vector<unique_ptr<Particle>> particles;
	vector<shared_ptr<ofxBox2dJoint>> joints;
};

#pragma once

#include "ofMain.h"

#include "ofxBox2d.h"

#include "Particle.h"

class ofApp : 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 mouseEntered(int x, int y) {}

void mouseExited(int x, int y) {}

void windowResized(int w, int h) {}

void dragEvent(ofDragInfo dragInfo) {}

void gotMessage(ofMessage msg) {}

void contactStart(ofxBox2dContactArgs &e);

void contactEnd(ofxBox2dContactArgs &e);

ofxBox2d box2d;

vector<unique_ptr<Particle>> particles;

vector<shared_ptr<ofxBox2dJoint>> joints;

};

#include "ofApp.h"

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

	ofSetFrameRate(60);
	ofSetWindowTitle("Insta");

	ofBackground(239);

	this->box2d.init();
	this->box2d.enableEvents();
	this->box2d.setGravity(0, 10);
	this->box2d.createBounds();
	this->box2d.setFPS(60);
	this->box2d.registerGrabbing();

	ofAddListener(box2d.contactStartEvents, this, &ofApp::contactStart);
	ofAddListener(box2d.contactEndEvents, this, &ofApp::contactEnd);
}

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

	if (ofGetFrameNum() % 1 == 0) {

		ofPoint point(ofRandom(ofGetWidth()), ofRandom(ofGetHeight() * 0.1));
		float radius = ofRandom(10, 15);
		unique_ptr<Particle> p(new Particle(this->box2d, point, radius));

		this->particles.push_back(std::move(p));
	}

	for (int i = this->particles.size() - 1; i >= 0; i--) {

		this->particles[i]->Update();
		if (this->particles[i]->IsDead()) {

			this->particles.erase(this->particles.begin() + i);
		}
	}

	this->box2d.update();
}

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

	for (int i = 0; i < this->particles.size(); i++) {

		this->particles[i]->Draw();
	}
}

//--------------------------------------------------------------
void ofApp::contactStart(ofxBox2dContactArgs &e) {

	if (e.a != NULL && e.b != NULL) {

		Particle* p_a = (Particle*)e.a->GetBody()->GetUserData();
		Particle* p_b = (Particle*)e.b->GetBody()->GetUserData();
		if (p_a != nullptr && p_b != nullptr) {

			ofPoint p_a_velocity = p_a->GetVelocity();
			ofPoint p_b_velocity = p_b->GetVelocity();
			if (p_a_velocity.length() < p_b_velocity.length()) {

				p_a->SetColor(p_b->GetColor());
			}
			else {

				p_b->SetColor(p_a->GetColor());
			}
		}
	}
}

//--------------------------------------------------------------
void ofApp::contactEnd(ofxBox2dContactArgs &e) {

	if (e.a != NULL && e.b != NULL) {

		// do nothing
	}
}

//--------------------------------------------------------------
int main() {

	ofSetupOpenGL(720, 720, OF_WINDOW);
	ofRunApp(new ofApp());
}

#include "ofApp.h"

//--------------------------------------------------------------

void ofApp::setup() {

ofSetFrameRate(60);

ofSetWindowTitle("Insta");

ofBackground(239);

this->box2d.init();

this->box2d.enableEvents();

this->box2d.setGravity(0, 10);

this->box2d.createBounds();

this->box2d.setFPS(60);

this->box2d.registerGrabbing();

ofAddListener(box2d.contactStartEvents, this, &ofApp::contactStart);

ofAddListener(box2d.contactEndEvents, this, &ofApp::contactEnd);

}

//--------------------------------------------------------------

void ofApp::update() {

if (ofGetFrameNum() % 1 == 0) {

ofPoint point(ofRandom(ofGetWidth()), ofRandom(ofGetHeight() * 0.1));

float radius = ofRandom(10, 15);

unique_ptr<Particle> p(new Particle(this->box2d, point, radius));

this->particles.push_back(std::move(p));

}

for (int i = this->particles.size() - 1; i >= 0; i--) {

this->particles[i]->Update();

if (this->particles[i]->IsDead()) {

this->particles.erase(this->particles.begin() + i);

}

this->box2d.update();

}

//--------------------------------------------------------------

void ofApp::draw() {

for (int i = 0; i < this->particles.size(); i++) {

this->particles[i]->Draw();

}

//--------------------------------------------------------------

void ofApp::contactStart(ofxBox2dContactArgs &e) {

if (e.a != NULL && e.b != NULL) {

Particle* p_a = (Particle*)e.a->GetBody()->GetUserData();

Particle* p_b = (Particle*)e.b->GetBody()->GetUserData();

if (p_a != nullptr && p_b != nullptr) {

ofPoint p_a_velocity = p_a->GetVelocity();

ofPoint p_b_velocity = p_b->GetVelocity();

if (p_a_velocity.length() < p_b_velocity.length()) {

p_a->SetColor(p_b->GetColor());

}

else {

p_b->SetColor(p_a->GetColor());

}

//--------------------------------------------------------------

void ofApp::contactEnd(ofxBox2dContactArgs &e) {

if (e.a != NULL && e.b != NULL) {

// do nothing

}

//--------------------------------------------------------------

int main() {

ofSetupOpenGL(720, 720, OF_WINDOW);

ofRunApp(new ofApp());

}

#pragma once
#include "ofMain.h"
#include "ofxBox2d.h"

class Particle
{
public:

	Particle(ofxBox2d& box2d, ofPoint point, float radius);
	~Particle();

	void Update();
	void Draw();

	void SetColor(ofColor color);
	ofColor GetColor();
	ofPoint GetVelocity();
	bool IsDead();
private:

	ofxBox2dCircle* circle = nullptr;
	ofColor color;
	float life;
};

#pragma once

#include "ofMain.h"

#include "ofxBox2d.h"

class Particle

{

public:

Particle(ofxBox2d& box2d, ofPoint point, float radius);

~Particle();

void Update();

void Draw();

void SetColor(ofColor color);

ofColor GetColor();

ofPoint GetVelocity();

bool IsDead();

private:

ofxBox2dCircle* circle = nullptr;

ofColor color;

float life;

};

#include "Particle.h"

Particle::Particle(ofxBox2d& box2d, ofPoint point, float radius)
{
	this->circle = new ofxBox2dCircle();
	this->circle->setPhysics(1.0, 0.5, 1.0);
	this->circle->setup(box2d.getWorld(), point.x, point.y, radius);
	this->circle->setData(this);

	this->color.setHsb(ofRandom(255), 255, 230);
	this->life = 255;
}

Particle::~Particle()
{
	if (this->circle != nullptr) {

		this->circle->destroy();
		delete this->circle;
	}
}

void Particle::Update() {

	this->life -= 0.75;
}

void Particle::Draw() {

	ofSetColor(this->color, this->life > 64 ? 255 : ofMap(this->life, 0, 64, 0, 255));
	ofDrawCircle(this->circle->getPosition(), this->circle->getRadius());
}

// Setter 
void Particle::SetColor(ofColor color) { this->color = color; }

// Getter
ofColor Particle::GetColor() { return this->color; }
ofPoint Particle::GetVelocity() { return this->circle->getVelocity(); }
bool Particle::IsDead() { return this->life <= 0 ? true : false; }

#include "Particle.h"

Particle::Particle(ofxBox2d& box2d, ofPoint point, float radius)

{

this->circle = new ofxBox2dCircle();

this->circle->setPhysics(1.0, 0.5, 1.0);

this->circle->setup(box2d.getWorld(), point.x, point.y, radius);

this->circle->setData(this);

this->color.setHsb(ofRandom(255), 255, 230);

this->life = 255;

}

Particle::~Particle()

{

if (this->circle != nullptr) {

this->circle->destroy();

delete this->circle;

}

void Particle::Update() {

this->life -= 0.75;

}

void Particle::Draw() {

ofSetColor(this->color, this->life > 64 ? 255 : ofMap(this->life, 0, 64, 0, 255));

ofDrawCircle(this->circle->getPosition(), this->circle->getRadius());

}

// Setter

void Particle::SetColor(ofColor color) { this->color = color; }

// Getter

ofColor Particle::GetColor() { return this->color; }

ofPoint Particle::GetVelocity() { return this->circle->getVelocity(); }

bool Particle::IsDead() { return this->life <= 0 ? true : false; }

[ Link ]
https://github.com/junkiyoshi/Insta20180808

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