プログラミング de 落描き – ページ 871 – クリエイティブ・コーディングによる生成物とソース

2018年5月15日2018年5月15日

箱の中のパーティクル openFrameworks ofxBullet

[ Video ]

[ About ]
お互いに反発するパーティクルを箱に閉じ込めました。普段は見えませんが、お互いが近づくと姿を現します。その性質により箱へ干渉する事で一斉に姿を現します。

[ Source ]

#pragma once
#include "ofMain.h"
#include "ofxBullet.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 windowResized(int w, int h) {};
	void dragEvent(ofDragInfo dragInfo) {};
	void gotMessage(ofMessage msg) {};

	ofCamera cam;
	ofxBulletWorldRigid world;

	unique_ptr<ofxBulletCustomShape> bounds_shape;
	vector<unique_ptr<ofxBulletSphere>> spheres;
};

#pragma once

#include "ofMain.h"

#include "ofxBullet.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 windowResized(int w, int h) {};

void dragEvent(ofDragInfo dragInfo) {};

void gotMessage(ofMessage msg) {};

ofCamera cam;

ofxBulletWorldRigid world;

unique_ptr<ofxBulletCustomShape> bounds_shape;

vector<unique_ptr<ofxBulletSphere>> spheres;

};

#include "ofApp.h"

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

	ofSetFrameRate(60);
	ofBackground(39);
	ofSetWindowTitle("Insta");

	ofEnableDepthTest();

	// Initialize ofxBulletWorld
	this->cam.setPosition(ofVec3f(0, 3.f, -30.f));
	this->cam.lookAt(ofVec3f(0, 0, 0), ofVec3f(0, -1, 0));
	this->world.setup();
	this->world.enableGrabbing();
	this->world.setCamera(&this->cam);
	this->world.setGravity(ofVec3f());

	// Create Big Box
	ofVec3f start_location;
	ofPoint dimens;
	float bounds_width = 400;
	float h_width = bounds_width * 0.5;
	float depth = 10.;
	float h_depth = depth * 0.5;
	this->bounds_shape.reset(new ofxBulletCustomShape());
	this->bounds_shape->create(world.world, ofVec3f(0, 0, 0), 10.);
	for (int i = 0; i < 6; i++) {
		if (i == 0) { // ground //
			start_location.set(0., h_width + h_depth, 0.);
			dimens.set(bounds_width, depth, bounds_width);
		}
		else if (i == 1) { // back wall //
			start_location.set(0, 0, h_width + h_depth);
			dimens.set(bounds_width, bounds_width, depth);
		}
		else if (i == 2) { // right wall //
			start_location.set(h_width + h_depth, 0, 0.);
			dimens.set(depth, bounds_width, bounds_width);
		}
		else if (i == 3) { // left wall //
			start_location.set(-h_width - h_depth, 0, 0.);
			dimens.set(depth, bounds_width, bounds_width);
		}
		else if (i == 4) { // ceiling //
			start_location.set(0, -h_width - h_depth, 0.);
			dimens.set(bounds_width, depth, bounds_width);
		}
		else if (i == 5) { // front wall //
			start_location.set(0, 0, -h_width - h_depth);
			dimens.set(bounds_width, bounds_width, depth);
		}
		btBoxShape* boxShape = ofBtGetBoxCollisionShape(dimens.x, dimens.y, dimens.z);
		this->bounds_shape->addShape(boxShape, start_location);
	}
	this->bounds_shape->add();

	// Create Spheres
	for (int i = 0; i < 255; i++) {

		unique_ptr<ofxBulletSphere> sphere(new ofxBulletSphere);
		float size = 5;
		sphere->create(this->world.world, ofVec3f(ofRandom(-100, 100), ofRandom(-100, 100), ofRandom(-100, 100)), 1, size);
		sphere->setRestitution(1.0);
		sphere->add();
		this->spheres.push_back(move(sphere));
	}
}

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

	// Big Box Moving To Center 
	if (!ofGetMousePressed()) {

		ofVec3f diff = ofVec3f(0, 0, 0) - bounds_shape->getPosition();
		diff *= 500.f;
		bounds_shape->applyCentralForce(diff);
	}

	// Compute Spheres Relation
	for (int i = 0; i < this->spheres.size(); i++) {

		for (int j = i + 1; j < this->spheres.size(); j++) {

			float distance = this->spheres[i]->getPosition().distance(this->spheres[j]->getPosition());
			if (distance < 80) {

				ofVec3f diff = this->spheres[i]->getPosition() - this->spheres[j]->getPosition();
				ofMap(distance, 0, 50, 40, -2);
				this->spheres[i]->applyCentralForce(diff);
				this->spheres[j]->applyCentralForce(-diff);
			}
		}
	}

	this->world.update();
}

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

	ofTranslate(ofGetWidth() / 2, ofGetHeight() / 2);

	// Draw Big Box
	ofNoFill();
	if (ofGetMousePressed()) {

		ofSetColor(39, 39, 239);
	}
	else {

		ofSetColor(239);
	}
	bounds_shape->transformGL();
	ofDrawBox(ofVec3f(0, 0, 0), 400);
	bounds_shape->restoreTransformGL();

	// Draw Sphere
	ofFill();
	for (int i = 0; i < this->spheres.size(); i++) {

		for (int j = i + 1; j < this->spheres.size(); j++) {

			float distance = this->spheres[i]->getPosition().distance(this->spheres[j]->getPosition());
			if (distance < 30) {

				ofSetColor(239);
				ofDrawLine(this->spheres[i]->getPosition(), this->spheres[j]->getPosition());
				ofDrawSphere(this->spheres[i]->getPosition(), this->spheres[i]->getRadius());
				ofDrawSphere(this->spheres[j]->getPosition(), this->spheres[j]->getRadius());
			}
			else if (distance < 60) {

				ofSetColor(239, ofMap(distance, 30, 60, 255, 0));
				ofDrawLine(this->spheres[i]->getPosition(), this->spheres[j]->getPosition());
				ofDrawSphere(this->spheres[i]->getPosition(), this->spheres[i]->getRadius());
				ofDrawSphere(this->spheres[j]->getPosition(), this->spheres[j]->getRadius());
			}
		}
	}
}

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

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

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#include "ofApp.h"

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

void ofApp::setup() {

ofSetFrameRate(60);

ofBackground(39);

ofSetWindowTitle("Insta");

ofEnableDepthTest();

// Initialize ofxBulletWorld

this->cam.setPosition(ofVec3f(0, 3.f, -30.f));

this->cam.lookAt(ofVec3f(0, 0, 0), ofVec3f(0, -1, 0));

this->world.setup();

this->world.enableGrabbing();

this->world.setCamera(&this->cam);

this->world.setGravity(ofVec3f());

// Create Big Box

ofVec3f start_location;

ofPoint dimens;

float bounds_width = 400;

float h_width = bounds_width * 0.5;

float depth = 10.;

float h_depth = depth * 0.5;

this->bounds_shape.reset(new ofxBulletCustomShape());

this->bounds_shape->create(world.world, ofVec3f(0, 0, 0), 10.);

for (int i = 0; i < 6; i++) {

if (i == 0) { // ground //

start_location.set(0., h_width + h_depth, 0.);

dimens.set(bounds_width, depth, bounds_width);

}

else if (i == 1) { // back wall //

start_location.set(0, 0, h_width + h_depth);

dimens.set(bounds_width, bounds_width, depth);

}

else if (i == 2) { // right wall //

start_location.set(h_width + h_depth, 0, 0.);

dimens.set(depth, bounds_width, bounds_width);

}

else if (i == 3) { // left wall //

start_location.set(-h_width - h_depth, 0, 0.);

dimens.set(depth, bounds_width, bounds_width);

}

else if (i == 4) { // ceiling //

start_location.set(0, -h_width - h_depth, 0.);

dimens.set(bounds_width, depth, bounds_width);

}

else if (i == 5) { // front wall //

start_location.set(0, 0, -h_width - h_depth);

dimens.set(bounds_width, bounds_width, depth);

}

btBoxShape* boxShape = ofBtGetBoxCollisionShape(dimens.x, dimens.y, dimens.z);

this->bounds_shape->addShape(boxShape, start_location);

}

this->bounds_shape->add();

// Create Spheres

for (int i = 0; i < 255; i++) {

unique_ptr<ofxBulletSphere> sphere(new ofxBulletSphere);

float size = 5;

sphere->create(this->world.world, ofVec3f(ofRandom(-100, 100), ofRandom(-100, 100), ofRandom(-100, 100)), 1, size);

sphere->setRestitution(1.0);

sphere->add();

this->spheres.push_back(move(sphere));

}

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

void ofApp::update() {

// Big Box Moving To Center

if (!ofGetMousePressed()) {

ofVec3f diff = ofVec3f(0, 0, 0) - bounds_shape->getPosition();

diff *= 500.f;

bounds_shape->applyCentralForce(diff);

}

// Compute Spheres Relation

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

for (int j = i + 1; j < this->spheres.size(); j++) {

float distance = this->spheres[i]->getPosition().distance(this->spheres[j]->getPosition());

if (distance < 80) {

ofVec3f diff = this->spheres[i]->getPosition() - this->spheres[j]->getPosition();

ofMap(distance, 0, 50, 40, -2);

this->spheres[i]->applyCentralForce(diff);

this->spheres[j]->applyCentralForce(-diff);

}

this->world.update();

}

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

void ofApp::draw() {

ofTranslate(ofGetWidth() / 2, ofGetHeight() / 2);

// Draw Big Box

ofNoFill();

if (ofGetMousePressed()) {

ofSetColor(39, 39, 239);

}

else {

ofSetColor(239);

}

bounds_shape->transformGL();

ofDrawBox(ofVec3f(0, 0, 0), 400);

bounds_shape->restoreTransformGL();

// Draw Sphere

ofFill();

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

for (int j = i + 1; j < this->spheres.size(); j++) {

float distance = this->spheres[i]->getPosition().distance(this->spheres[j]->getPosition());

if (distance < 30) {

ofSetColor(239);

ofDrawLine(this->spheres[i]->getPosition(), this->spheres[j]->getPosition());

ofDrawSphere(this->spheres[i]->getPosition(), this->spheres[i]->getRadius());

ofDrawSphere(this->spheres[j]->getPosition(), this->spheres[j]->getRadius());

}

else if (distance < 60) {

ofSetColor(239, ofMap(distance, 30, 60, 255, 0));

ofDrawLine(this->spheres[i]->getPosition(), this->spheres[j]->getPosition());

ofDrawSphere(this->spheres[i]->getPosition(), this->spheres[i]->getRadius());

ofDrawSphere(this->spheres[j]->getPosition(), this->spheres[j]->getRadius());

}

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

int main() {

ofSetupOpenGL(720, 720, OF_WINDOW);

ofRunApp(new ofApp());

}

[ Link ]
https://github.com/junkiyoshi/Insta20180515

2018年5月14日2018年5月15日

箱の中のSphere openFrameworks ofxBullet

[ Video ]

[ About ]
箱の中に閉じ込められている球体は、お互いに反発する力が働いており、一定の距離を保っています。今回は3次元の物理エンジンAddonであるofxBulletを0.10.0環境で動かしてみました。

[ Source ]

#pragma once
#include "ofMain.h"
#include "ofxBullet.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 windowResized(int w, int h) {};
	void dragEvent(ofDragInfo dragInfo) {};
	void gotMessage(ofMessage msg) {};

	ofCamera cam;
	ofxBulletWorldRigid world;

	unique_ptr<ofxBulletCustomShape> bounds_shape;
	vector<unique_ptr<ofxBulletSphere>> spheres;
	vector<ofColor> spheres_color;
};

#pragma once

#include "ofMain.h"

#include "ofxBullet.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 windowResized(int w, int h) {};

void dragEvent(ofDragInfo dragInfo) {};

void gotMessage(ofMessage msg) {};

ofCamera cam;

ofxBulletWorldRigid world;

unique_ptr<ofxBulletCustomShape> bounds_shape;

vector<unique_ptr<ofxBulletSphere>> spheres;

vector<ofColor> spheres_color;

};

#include "ofApp.h"

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

	ofSetFrameRate(60);
	ofBackground(239);
	ofSetWindowTitle("Insta");

	ofEnableDepthTest();

	// Initialize ofxBulletWorld
	this->cam.setPosition(ofVec3f(0, 3.f, -30.f));
	this->cam.lookAt(ofVec3f(0, 0, 0), ofVec3f(0, -1, 0));
	this->world.setup();
	this->world.enableGrabbing();
	this->world.setCamera(&this->cam);
	this->world.setGravity(ofVec3f());

	// Create Big Box
	ofVec3f start_location;
	ofPoint dimens;
	float bounds_width = 400;
	float h_width = bounds_width * 0.5;
	float depth = 10.;
	float h_depth = depth * 0.5;
	this->bounds_shape.reset(new ofxBulletCustomShape());
	this->bounds_shape->create(world.world, ofVec3f(0, 0, 0), 10.);
	for (int i = 0; i < 6; i++) {
		if (i == 0) { // ground //
			start_location.set(0., h_width + h_depth, 0.);
			dimens.set(bounds_width, depth, bounds_width);
		}
		else if (i == 1) { // back wall //
			start_location.set(0, 0, h_width + h_depth);
			dimens.set(bounds_width, bounds_width, depth);
		}
		else if (i == 2) { // right wall //
			start_location.set(h_width + h_depth, 0, 0.);
			dimens.set(depth, bounds_width, bounds_width);
		}
		else if (i == 3) { // left wall //
			start_location.set(-h_width - h_depth, 0, 0.);
			dimens.set(depth, bounds_width, bounds_width);
		}
		else if (i == 4) { // ceiling //
			start_location.set(0, -h_width - h_depth, 0.);
			dimens.set(bounds_width, depth, bounds_width);
		}
		else if (i == 5) { // front wall //
			start_location.set(0, 0, -h_width - h_depth);
			dimens.set(bounds_width, bounds_width, depth);
		}
		btBoxShape* boxShape = ofBtGetBoxCollisionShape(dimens.x, dimens.y, dimens.z);
		this->bounds_shape->addShape(boxShape, start_location);
	}
	this->bounds_shape->add();

	// Create Spheres
	for (int i = 0; i < 100; i++) {

		unique_ptr<ofxBulletSphere> sphere(new ofxBulletSphere);
		float size = ofRandom(8, 30);
		sphere->create(this->world.world, ofVec3f(ofRandom(-100, 100), ofRandom(-100, 100), ofRandom(-100, 100)), 1, size);
		sphere->setRestitution(1.0);
		sphere->add();
		this->spheres.push_back(move(sphere));

		ofColor color;
		color.setHsb(ofRandom(255), 239, 239);
		this->spheres_color.push_back(color);
	}
}

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

	// Big Box Moving To Center 
	if (!ofGetMousePressed()) {

		ofVec3f diff = ofVec3f(0, 0, 0) - bounds_shape->getPosition();
		diff *= 500.f;
		bounds_shape->applyCentralForce(diff);
	}

	// Compute Spheres Relation
	for (int i = 0; i < this->spheres.size(); i++) {

		for (int j = i + 1; j < this->spheres.size(); j++) {

			float distance = this->spheres[i]->getPosition().distance(this->spheres[j]->getPosition());
			if (distance < 100) {

				ofVec3f diff = this->spheres[i]->getPosition() - this->spheres[j]->getPosition();
				ofMap(distance, 0, 100, 40, 0);
				this->spheres[i]->applyCentralForce(diff);
				this->spheres[j]->applyCentralForce(-diff);
			}
		}
	}

	this->world.update();
}

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

	ofTranslate(ofGetWidth() / 2, ofGetHeight() / 2);

	// Draw Big Box
	ofNoFill();
	if (ofGetMousePressed()) {

		ofSetColor(39, 39, 239);
	}
	else {

		ofSetColor(39);
	}
	bounds_shape->transformGL();
	ofDrawBox(ofVec3f(0, 0, 0), 400);
	bounds_shape->restoreTransformGL();

	// Draw Sphere
	ofFill();
	for (int i = 0; i < this->spheres.size(); i++) {
		
		ofSetColor(this->spheres_color[i]);
		ofDrawSphere(this->spheres[i]->getPosition(), this->spheres[i]->getRadius());
	}
}

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

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

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#include "ofApp.h"

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

void ofApp::setup() {

ofSetFrameRate(60);

ofBackground(239);

ofSetWindowTitle("Insta");

ofEnableDepthTest();

// Initialize ofxBulletWorld

this->cam.setPosition(ofVec3f(0, 3.f, -30.f));

this->cam.lookAt(ofVec3f(0, 0, 0), ofVec3f(0, -1, 0));

this->world.setup();

this->world.enableGrabbing();

this->world.setCamera(&this->cam);

this->world.setGravity(ofVec3f());

// Create Big Box

ofVec3f start_location;

ofPoint dimens;

float bounds_width = 400;

float h_width = bounds_width * 0.5;

float depth = 10.;

float h_depth = depth * 0.5;

this->bounds_shape.reset(new ofxBulletCustomShape());

this->bounds_shape->create(world.world, ofVec3f(0, 0, 0), 10.);

for (int i = 0; i < 6; i++) {

if (i == 0) { // ground //

start_location.set(0., h_width + h_depth, 0.);

dimens.set(bounds_width, depth, bounds_width);

}

else if (i == 1) { // back wall //

start_location.set(0, 0, h_width + h_depth);

dimens.set(bounds_width, bounds_width, depth);

}

else if (i == 2) { // right wall //

start_location.set(h_width + h_depth, 0, 0.);

dimens.set(depth, bounds_width, bounds_width);

}

else if (i == 3) { // left wall //

start_location.set(-h_width - h_depth, 0, 0.);

dimens.set(depth, bounds_width, bounds_width);

}

else if (i == 4) { // ceiling //

start_location.set(0, -h_width - h_depth, 0.);

dimens.set(bounds_width, depth, bounds_width);

}

else if (i == 5) { // front wall //

start_location.set(0, 0, -h_width - h_depth);

dimens.set(bounds_width, bounds_width, depth);

}

btBoxShape* boxShape = ofBtGetBoxCollisionShape(dimens.x, dimens.y, dimens.z);

this->bounds_shape->addShape(boxShape, start_location);

}

this->bounds_shape->add();

// Create Spheres

for (int i = 0; i < 100; i++) {

unique_ptr<ofxBulletSphere> sphere(new ofxBulletSphere);

float size = ofRandom(8, 30);

sphere->create(this->world.world, ofVec3f(ofRandom(-100, 100), ofRandom(-100, 100), ofRandom(-100, 100)), 1, size);

sphere->setRestitution(1.0);

sphere->add();

this->spheres.push_back(move(sphere));

ofColor color;

color.setHsb(ofRandom(255), 239, 239);

this->spheres_color.push_back(color);

}

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

void ofApp::update() {

// Big Box Moving To Center

if (!ofGetMousePressed()) {

ofVec3f diff = ofVec3f(0, 0, 0) - bounds_shape->getPosition();

diff *= 500.f;

bounds_shape->applyCentralForce(diff);

}

// Compute Spheres Relation

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

for (int j = i + 1; j < this->spheres.size(); j++) {

float distance = this->spheres[i]->getPosition().distance(this->spheres[j]->getPosition());

if (distance < 100) {

ofVec3f diff = this->spheres[i]->getPosition() - this->spheres[j]->getPosition();

ofMap(distance, 0, 100, 40, 0);

this->spheres[i]->applyCentralForce(diff);

this->spheres[j]->applyCentralForce(-diff);

}

this->world.update();

}

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

void ofApp::draw() {

ofTranslate(ofGetWidth() / 2, ofGetHeight() / 2);

// Draw Big Box

ofNoFill();

if (ofGetMousePressed()) {

ofSetColor(39, 39, 239);

}

else {

ofSetColor(39);

}

bounds_shape->transformGL();

ofDrawBox(ofVec3f(0, 0, 0), 400);

bounds_shape->restoreTransformGL();

// Draw Sphere

ofFill();

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

ofSetColor(this->spheres_color[i]);

ofDrawSphere(this->spheres[i]->getPosition(), this->spheres[i]->getRadius());

}

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

int main() {

ofSetupOpenGL(720, 720, OF_WINDOW);

ofRunApp(new ofApp());

}

[ Link ]
https://github.com/junkiyoshi/Insta20180514

2018年5月13日2018年5月13日

惹かれて離れて openFrameworks ofxBox2d

[ Video ]

[ About ]
一定周期でParticle同士が、お互いに引き合う力・突き放す力が入れ替わります。

[ Source ]

#include "ofMain.h"
#include "ofxBox2d.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) {}

	int direction;

	ofxBox2d box2d;
	vector<shared_ptr<ofxBox2dCircle>> circles;
	vector<ofColor> circles_color;
};

#include "ofMain.h"

#include "ofxBox2d.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) {}

int direction;

ofxBox2d box2d;

vector<shared_ptr<ofxBox2dCircle>> circles;

vector<ofColor> circles_color;

};

#include "ofApp.h"

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

	ofSetFrameRate(60);
	ofBackground(239);
	ofSetWindowTitle("Insta");

	ofSetColor(39);

	// Initialize ofxBox2d
	this->box2d.init();
	this->box2d.setGravity(0, 0);
	this->box2d.createBounds();
	this->box2d.setFPS(60);
	this->box2d.registerGrabbing();

	// Add Circle
	for (int i = 0; i < 255; i++) {

		float radius = 12;
		auto circle = make_shared<ofxBox2dCircle>();
		circle->setPhysics(1.0, 0.63, 0.1);
		circle->setup(this->box2d.getWorld(), ofRandom(ofGetWidth() / 2), ofRandom(ofGetHeight() / 2), radius);

		this->circles.push_back(circle);

		ofColor circle_color;
		circle_color.setHsb(ofRandom(255), 239, 239);

		this->circles_color.push_back(circle_color);
	}

	this->direction = 1;
}

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

	// Change Power Direction
	if (ofGetFrameNum() % 300 == 0) {
		
		this->direction *= -1;
	}

	// Circles Compute Power
	for (int i = 0; i < this->circles.size(); i++) {

		for (int j = i + 1; j < this->circles.size(); j++) {

			float distance = this->circles[i]->getPosition().distance(this->circles[j]->getPosition());
			if (distance < 80) {

				this->circles[i]->addForce(this->circles[i]->getPosition() - this->circles[j]->getPosition(), 0.75 * this->direction);
				this->circles[j]->addForce(this->circles[j]->getPosition() - this->circles[i]->getPosition(), 0.75 * this->direction);
			}
		}
	}

	// Compute box2d
	this->box2d.update();
}


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

	// Draw Circles
	for (int i = 0; i < this->circles.size(); i++) {

		float radius = this->circles[i]->getRadius();
		ofPoint point = this->circles[i]->getPosition();
		ofPoint velocity = this->circles[i]->getVelocity();
		
		ofSetColor(this->circles_color[i]);

		ofPushMatrix();
		ofTranslate(point);

		if (velocity.length() < radius) {

			ofDrawCircle(ofPoint(), radius);
		}
		else {

			float velocity_deg = atan2f(velocity.y, velocity.x) * RAD_TO_DEG + 180;
			ofBeginShape();
			for (int deg = velocity_deg + 90; deg < velocity_deg + 270; deg++) {

				ofVertex(radius * cos(deg * DEG_TO_RAD), radius * sin(deg * DEG_TO_RAD));
			}
			ofVertex(-velocity * 2);
			ofEndShape(true);
		}

		ofPopMatrix();
	}
}

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

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

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#include "ofApp.h"

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

void ofApp::setup() {

ofSetFrameRate(60);

ofBackground(239);

ofSetWindowTitle("Insta");

ofSetColor(39);

// Initialize ofxBox2d

this->box2d.init();

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

this->box2d.createBounds();

this->box2d.setFPS(60);

this->box2d.registerGrabbing();

// Add Circle

for (int i = 0; i < 255; i++) {

float radius = 12;

auto circle = make_shared<ofxBox2dCircle>();

circle->setPhysics(1.0, 0.63, 0.1);

circle->setup(this->box2d.getWorld(), ofRandom(ofGetWidth() / 2), ofRandom(ofGetHeight() / 2), radius);

this->circles.push_back(circle);

ofColor circle_color;

circle_color.setHsb(ofRandom(255), 239, 239);

this->circles_color.push_back(circle_color);

}

this->direction = 1;

}

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

void ofApp::update() {

// Change Power Direction

if (ofGetFrameNum() % 300 == 0) {

this->direction *= -1;

}

// Circles Compute Power

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

for (int j = i + 1; j < this->circles.size(); j++) {

float distance = this->circles[i]->getPosition().distance(this->circles[j]->getPosition());

if (distance < 80) {

this->circles[i]->addForce(this->circles[i]->getPosition() - this->circles[j]->getPosition(), 0.75 * this->direction);

this->circles[j]->addForce(this->circles[j]->getPosition() - this->circles[i]->getPosition(), 0.75 * this->direction);

}

// Compute box2d

this->box2d.update();

}

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

void ofApp::draw() {

// Draw Circles

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

float radius = this->circles[i]->getRadius();

ofPoint point = this->circles[i]->getPosition();

ofPoint velocity = this->circles[i]->getVelocity();

ofSetColor(this->circles_color[i]);

ofPushMatrix();

ofTranslate(point);

if (velocity.length() < radius) {

ofDrawCircle(ofPoint(), radius);

}

else {

float velocity_deg = atan2f(velocity.y, velocity.x) * RAD_TO_DEG + 180;

ofBeginShape();

for (int deg = velocity_deg + 90; deg < velocity_deg + 270; deg++) {

ofVertex(radius * cos(deg * DEG_TO_RAD), radius * sin(deg * DEG_TO_RAD));

}

ofVertex(-velocity * 2);

ofEndShape(true);

}

ofPopMatrix();

}

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

int main() {

ofSetupOpenGL(720, 720, OF_WINDOW);

ofRunApp(new ofApp());

}

[ Link ]
https://github.com/junkiyoshi/Insta20180513

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