プログラミング de 落描き – ページ 809 – 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2月3日2018年2月2日

OpenCVでフレームの差分をとってParticle生成 openFrameworks ofxBox2d OpenCV

[ Video ]

[ About ]
OpenCVでWebカメラの映像を取得、毎フレームの差分を取得して、その情報をもとにParticleを生成しています。画像に動きのある部分からカラフルな玉が発生します。

本当はもうちょっと細かな粒子のようなものや、映像の色を反映した破片のようなオブジェクトを作りたかったのですが、リアルタイムだと処理性能的に厳しかったです。また今度、MPEGファイルから生成するような形で試してみようと思います。

[ Source ]

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

#include "ofxBox2d.h"

#include "opencv2/opencv.hpp"

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) {};

	ofFbo fbo;

	ofxBox2d box2d;
	vector<shared_ptr<ofxBox2dCircle>> circles;
	vector<ofColor> circles_color;
	
	cv::VideoCapture cap;
	cv::Mat pre_frame;
	cv::Mat frame;
	ofImage image;
};

#pragma once

#include "ofMain.h"

#include "ofFbo.h"

#include "ofxBox2d.h"

#include "opencv2/opencv.hpp"

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) {};

ofFbo fbo;

ofxBox2d box2d;

vector<shared_ptr<ofxBox2dCircle>> circles;

vector<ofColor> circles_color;

cv::VideoCapture cap;

cv::Mat pre_frame;

cv::Mat frame;

ofImage image;

};

#include "ofApp.h"

//--------------------------------------------------------------
void ofApp::setup() {
	ofSetFrameRate(30);
	ofBackground(0);
	ofSetWindowTitle("Insta");

	this->box2d.init();
	this->box2d.setGravity(0, 50);
	//this->box2d.createBounds();
	this->box2d.setFPS(30);
	//this->box2d.registerGrabbing();

	this->cap.open(1);
	this->image.allocate(this->cap.get(CV_CAP_PROP_FRAME_WIDTH), this->cap.get(CV_CAP_PROP_FRAME_HEIGHT), OF_IMAGE_COLOR);
	this->frame = cv::Mat(this->image.getHeight(), this->image.getWidth(), CV_MAKETYPE(CV_8UC3, this->image.getPixels().getNumChannels()), this->image.getPixels().getData(), 0);
	
	this->fbo.allocate(ofGetWidth(), ofGetHeight());
}

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

	cv::Mat src;
	this->cap >> src;
	cv::flip(src, src, 1);
	cv::cvtColor(src, this->frame, cv::COLOR_BGR2RGB);


	float span = 15;
	if (ofGetFrameNum() > 10) {

		cv::Mat gap = this->pre_frame - src;
		vector<ofVec2f> gap_points;

		for (int y = 0; y < gap.rows; y += span) {

			cv::Vec3b* value = gap.ptr<cv::Vec3b>(y, 0);
			for (int x = 0; x < gap.cols; x += span) {

				cv::Vec3b v = value[x];
				if ((v[0] + v[1] + v[2]) > 32) {
					 
					shared_ptr<ofxBox2dCircle> circle = shared_ptr<ofxBox2dCircle>(new ofxBox2dCircle);
					circle.get()->setPhysics(3.0, 0.5, 0.1);
					circle.get()->setup(this->box2d.getWorld(), x + ofGetWidth() / 2 - this->image.getWidth() / 2 + ofRandom(-span / 2, span / 2), y + 30 + ofRandom(-span / 2, span / 2), span / 2);
					this->circles.push_back(circle);

					ofColor c;
					c.setHsb(ofRandom(255), 220, 220);
					this->circles_color.push_back(c);

				}
			}
		}
	}
	this->pre_frame = src;
	this->image.update();

	this->fbo.begin();
	ofClear(0);

	ofSetColor(255);
	this->image.draw(ofGetWidth() / 2 - this->image.getWidth() / 2, 30);

	for (int i = this->circles.size() - 1; i >= 0; i--) {
		
		if (this->circles[i].get()->getPosition().y > ofGetHeight()) {

			this->circles[i].get()->destroy();
			this->circles.erase(this->circles.begin() + i);
			this->circles_color.erase(this->circles_color.begin() + i);
		}
		else {

			ofSetColor(this->circles_color[i]);
			ofDrawCircle(this->circles[i].get()->getPosition(), this->circles[i].get()->getRadius());
		}
	}

	this->fbo.end();

	this->box2d.update();
}

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

	this->fbo.draw(0, 0);
}

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

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

#include "ofApp.h"

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

void ofApp::setup() {

ofSetFrameRate(30);

ofBackground(0);

ofSetWindowTitle("Insta");

this->box2d.init();

this->box2d.setGravity(0, 50);

//this->box2d.createBounds();

this->box2d.setFPS(30);

//this->box2d.registerGrabbing();

this->cap.open(1);

this->image.allocate(this->cap.get(CV_CAP_PROP_FRAME_WIDTH), this->cap.get(CV_CAP_PROP_FRAME_HEIGHT), OF_IMAGE_COLOR);

this->frame = cv::Mat(this->image.getHeight(), this->image.getWidth(), CV_MAKETYPE(CV_8UC3, this->image.getPixels().getNumChannels()), this->image.getPixels().getData(), 0);

this->fbo.allocate(ofGetWidth(), ofGetHeight());

}

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

void ofApp::update() {

cv::Mat src;

this->cap >> src;

cv::flip(src, src, 1);

cv::cvtColor(src, this->frame, cv::COLOR_BGR2RGB);

float span = 15;

if (ofGetFrameNum() > 10) {

cv::Mat gap = this->pre_frame - src;

vector<ofVec2f> gap_points;

for (int y = 0; y < gap.rows; y += span) {

cv::Vec3b* value = gap.ptr<cv::Vec3b>(y, 0);

for (int x = 0; x < gap.cols; x += span) {

cv::Vec3b v = value[x];

if ((v[0] + v[1] + v[2]) > 32) {

shared_ptr<ofxBox2dCircle> circle = shared_ptr<ofxBox2dCircle>(new ofxBox2dCircle);

circle.get()->setPhysics(3.0, 0.5, 0.1);

circle.get()->setup(this->box2d.getWorld(), x + ofGetWidth() / 2 - this->image.getWidth() / 2 + ofRandom(-span / 2, span / 2), y + 30 + ofRandom(-span / 2, span / 2), span / 2);

this->circles.push_back(circle);

ofColor c;

c.setHsb(ofRandom(255), 220, 220);

this->circles_color.push_back(c);

}

this->pre_frame = src;

this->image.update();

this->fbo.begin();

ofClear(0);

ofSetColor(255);

this->image.draw(ofGetWidth() / 2 - this->image.getWidth() / 2, 30);

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

if (this->circles[i].get()->getPosition().y > ofGetHeight()) {

this->circles[i].get()->destroy();

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

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

}

else {

ofSetColor(this->circles_color[i]);

ofDrawCircle(this->circles[i].get()->getPosition(), this->circles[i].get()->getRadius());

}

this->fbo.end();

this->box2d.update();

}

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

void ofApp::draw() {

this->fbo.draw(0, 0);

}

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

int main() {

ofSetupOpenGL(720, 720, OF_WINDOW);

ofRunApp(new ofApp());

}

[ Link ]
https://github.com/junkiyoshi/Insta20180202

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2018年2月2日2018年2月1日

Particleの動きでPolygon生成 openFrameworks ofxBox2d

[ Video ]

[ About ]
Particleの位置関係(お互いに近いParticleが3つ以上あった場合)を元にofxBox2dのPolygonを生成しています。

ポロポロと生成されては消えていくのを眺めていると癒されます。OpenCVのフレーム間のギャップをオブジェクトに置き換えても面白そうかな。

[ Source ]

#pragma once
#include "ofMain.h"
#include "ofFbo.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) {};

	ofFbo fbo;

	vector<unique_ptr<Particle>> particles;

	ofxBox2d box2d;
	vector<shared_ptr<ofxBox2dPolygon>> polygons;
	vector<float> polygons_life;
	vector<ofColor> polygons_color;
};

#pragma once

#include "ofMain.h"

#include "ofFbo.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) {};

ofFbo fbo;

vector<unique_ptr<Particle>> particles;

ofxBox2d box2d;

vector<shared_ptr<ofxBox2dPolygon>> polygons;

vector<float> polygons_life;

vector<ofColor> polygons_color;

};

#include "ofApp.h"

//--------------------------------------------------------------
void ofApp::setup() {
	ofSetFrameRate(60);
	ofBackground(255);
	ofSetWindowTitle("Insta");


	for (int i = 0; i < 32 + 12; i++) {

		unique_ptr<Particle> particle(new Particle());
		this->particles.push_back(std::move(particle));
	}

	this->box2d.init();
	this->box2d.setGravity(0, 50);
	this->box2d.createBounds();
	this->box2d.setFPS(60);
	this->box2d.registerGrabbing();

	this->fbo.allocate(ofGetWidth(), ofGetHeight());
}

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

	for (int i = this->polygons.size() - 1; i >= 0; i--) {
		
		this->polygons_life[i] -= 1;

		if (this->polygons_life[i] < 20) {

			this->polygons[i].get()->destroy();
			this->polygons.erase(this->polygons.begin() + i);
			this->polygons_life.erase(this->polygons_life.begin() + i);
			this->polygons_color.erase(this->polygons_color.begin() + i);
		}
	}


	this->fbo.begin();
	ofClear(0);

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

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

		vector<ofVec2f> near_points;
		for (int j = i; j < this->particles.size(); j++) {

			float distance = this->particles[i]->get_location().distance(this->particles[j]->get_location());

			if (distance < 50) {

				ofSetColor(this->particles[i]->get_body_color(), 128);
				ofDrawLine(this->particles[i]->get_location(), this->particles[j]->get_location());
				if (distance < 35) {
					near_points.push_back(this->particles[j]->get_location());
				}
			}
		}

		if (near_points.size() >= 3) {

			shared_ptr<ofxBox2dPolygon> polygon = shared_ptr<ofxBox2dPolygon>(new ofxBox2dPolygon);
			for (int n_index = 0; n_index < near_points.size(); n_index++) {
				polygon.get()->addVertex(near_points[n_index]);
			}

			polygon.get()->setPhysics(1.0, 0.7, 0.3);
			polygon.get()->create(box2d.getWorld());
			
			this->polygons.push_back(polygon);
			this->polygons_life.push_back(255);
			ofColor c;
			c.setHsb(ofRandom(255), 255, 255);
			this->polygons_color.push_back(c);
		}
	}

	this->box2d.update();

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

		ofSetColor(this->polygons_color[i], this->polygons_life[i]);
		this->polygons[i].get()->draw();
	}

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

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

	this->fbo.end();
}

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

	this->fbo.draw(0, 0);
}

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

	ofSetupOpenGL(1280, 720, OF_WINDOW);
	ofRunApp(new ofApp());
}

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#include "ofApp.h"

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

void ofApp::setup() {

ofSetFrameRate(60);

ofBackground(255);

ofSetWindowTitle("Insta");

for (int i = 0; i < 32 + 12; i++) {

unique_ptr<Particle> particle(new Particle());

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

}

this->box2d.init();

this->box2d.setGravity(0, 50);

this->box2d.createBounds();

this->box2d.setFPS(60);

this->box2d.registerGrabbing();

this->fbo.allocate(ofGetWidth(), ofGetHeight());

}

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

void ofApp::update() {

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

this->polygons_life[i] -= 1;

if (this->polygons_life[i] < 20) {

this->polygons[i].get()->destroy();

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

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

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

}

this->fbo.begin();

ofClear(0);

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

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

vector<ofVec2f> near_points;

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

float distance = this->particles[i]->get_location().distance(this->particles[j]->get_location());

if (distance < 50) {

ofSetColor(this->particles[i]->get_body_color(), 128);

ofDrawLine(this->particles[i]->get_location(), this->particles[j]->get_location());

if (distance < 35) {

near_points.push_back(this->particles[j]->get_location());

}

if (near_points.size() >= 3) {

shared_ptr<ofxBox2dPolygon> polygon = shared_ptr<ofxBox2dPolygon>(new ofxBox2dPolygon);

for (int n_index = 0; n_index < near_points.size(); n_index++) {

polygon.get()->addVertex(near_points[n_index]);

}

polygon.get()->setPhysics(1.0, 0.7, 0.3);

polygon.get()->create(box2d.getWorld());

this->polygons.push_back(polygon);

this->polygons_life.push_back(255);

ofColor c;

c.setHsb(ofRandom(255), 255, 255);

this->polygons_color.push_back(c);

}

this->box2d.update();

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

ofSetColor(this->polygons_color[i], this->polygons_life[i]);

this->polygons[i].get()->draw();

}

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

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

}

this->fbo.end();

}

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

void ofApp::draw() {

this->fbo.draw(0, 0);

}

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

int main() {

ofSetupOpenGL(1280, 720, OF_WINDOW);

ofRunApp(new ofApp());

}

#pragma once
#include "ofMain.h"

class Particle
{
public:
	Particle();
	~Particle() {};

	void apply_force(ofVec2f force);
	void update();
	void draw();

	void set_color(ofColor body_color);
	ofVec2f get_location();
	ofColor get_body_color();

private:
	ofVec2f location;
	ofVec2f velocity;
	ofVec2f acceleration;
	ofColor body_color;
};

#pragma once

#include "ofMain.h"

class Particle

{

public:

Particle();

~Particle() {};

void apply_force(ofVec2f force);

void update();

void draw();

void set_color(ofColor body_color);

ofVec2f get_location();

ofColor get_body_color();

private:

ofVec2f location;

ofVec2f velocity;

ofVec2f acceleration;

ofColor body_color;

};

#include "Particle.h"

Particle::Particle() {

	this->location = ofVec2f(ofRandom(ofGetWidth()), ofRandom(ofGetHeight()));
	this->velocity = ofVec2f(ofRandom(-3, 3), ofRandom(-3, 3));
	this->velocity = this->velocity.normalized() * ofRandom(3, 5);
	this->acceleration = ofVec2f();
	//this->body_color.setHsb(ofRandom(255), 230, 230);
	this->body_color = ofColor(0);
}

void Particle::apply_force(ofVec2f force) {

	this->acceleration += force;
}

void Particle::update() {

	this->acceleration += this->velocity;
	this->location += this->acceleration;
	this->acceleration *= 0;

	if (this->location.x < 0) {

		this->location.x = 0;
		this->velocity.x *= -1;
	}
	else if (this->location.x > ofGetWidth()) {

		this->location.x = ofGetWidth();
		this->velocity.x *= -1;
	}

	if (this->location.y < 0) {

		this->location.y = 0;
		this->velocity.y *= -1;
	}
	else if (this->location.y > ofGetHeight() / 2) {

		this->location.y = ofGetHeight() / 2;
		this->velocity.y *= -1;
	}
}

void Particle::draw() {

	ofSetColor(this->body_color);
	ofDrawCircle(this->location, 3);
}

void Particle::set_color(ofColor body_color) {

	this->body_color = body_color;
}

ofVec2f Particle::get_location() {

	return this->location;
}

ofColor Particle::get_body_color() {

	return this->body_color;
}

#include "Particle.h"

Particle::Particle() {

this->location = ofVec2f(ofRandom(ofGetWidth()), ofRandom(ofGetHeight()));

this->velocity = ofVec2f(ofRandom(-3, 3), ofRandom(-3, 3));

this->velocity = this->velocity.normalized() * ofRandom(3, 5);

this->acceleration = ofVec2f();

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

this->body_color = ofColor(0);

}

void Particle::apply_force(ofVec2f force) {

this->acceleration += force;

}

void Particle::update() {

this->acceleration += this->velocity;

this->location += this->acceleration;

this->acceleration *= 0;

if (this->location.x < 0) {

this->location.x = 0;

this->velocity.x *= -1;

}

else if (this->location.x > ofGetWidth()) {

this->location.x = ofGetWidth();

this->velocity.x *= -1;

}

if (this->location.y < 0) {

this->location.y = 0;

this->velocity.y *= -1;

}

else if (this->location.y > ofGetHeight() / 2) {

this->location.y = ofGetHeight() / 2;

this->velocity.y *= -1;

}

void Particle::draw() {

ofSetColor(this->body_color);

ofDrawCircle(this->location, 3);

}

void Particle::set_color(ofColor body_color) {

this->body_color = body_color;

}

ofVec2f Particle::get_location() {

return this->location;

}

ofColor Particle::get_body_color() {

return this->body_color;

}

[ Link ]
https://github.com/junkiyoshi/Insta20180201

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2018年2月1日2018年1月31日

文字列のPath情報で物理演算 openFrameworks ofxBox2d

[ Video ]

[ About ]
文字から抜き出したPath情報を元にofxBox2dで物理演算をしています。Key入力を元に文字が生成されているので、リアルタイムに入力した文字が崩れていきます。

昔に一度、作りたいと思いながらもPath情報の取得方法が分からずに諦めていたのですが、ついに念願が叶いました。出来なった事が出来るようになるのは嬉しいですね。

[ Source ]

#pragma once
#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) {};

	ofTrueTypeFont font;

	ofxBox2d box2d;
	vector<shared_ptr<ofxBox2dPolygon>> polygons;
	vector<float> polygons_life;
	vector<ofColor> polygons_color;
	ofxBox2dEdge eage_1, eage_2;
};

#pragma once

#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) {};

ofTrueTypeFont font;

ofxBox2d box2d;

vector<shared_ptr<ofxBox2dPolygon>> polygons;

vector<float> polygons_life;

vector<ofColor> polygons_color;

ofxBox2dEdge eage_1, eage_2;

};

#include "ofApp.h"

//--------------------------------------------------------------
void ofApp::setup() {
	ofSetFrameRate(60);
	ofBackground(255);
	ofSetWindowTitle("Insta");

	ofSetColor(0);
	ofSetRectMode(ofRectMode::OF_RECTMODE_CENTER);

	this->font.loadFont("fonts/Kazesawa-Bold.ttf", 130, true, false, true);

	this->box2d.init();
	this->box2d.setGravity(0, 50);
	this->box2d.createBounds();
	this->box2d.setFPS(60);
	this->box2d.registerGrabbing();

	this->eage_1 = ofxBox2dEdge();
	this->eage_1.addVertex(ofVec2f(ofGetWidth() / 2 - 150, ofGetHeight() / 2 + 100));
	this->eage_1.addVertex(ofVec2f(ofGetWidth() / 2, ofGetHeight() / 2));
	this->eage_1.create(this->box2d.getWorld());

	this->eage_2 = ofxBox2dEdge();
	this->eage_2.addVertex(ofVec2f(ofGetWidth() / 2 + 150, ofGetHeight() / 2 + 100));
	this->eage_2.addVertex(ofVec2f(ofGetWidth() / 2, ofGetHeight() / 2));
	this->eage_2.create(this->box2d.getWorld());
}

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

	for (int i = this->polygons.size() - 1; i >= 0; i--) {
		
		this->polygons_life[i] -= 1;

		if (this->polygons_life[i] < 20) {

			this->polygons[i].get()->destroy();
			this->polygons.erase(this->polygons.begin() + i);
			this->polygons_life.erase(this->polygons_life.begin() + i);
			this->polygons_color.erase(this->polygons_color.begin() + i);
		}
	}

	this->box2d.update();
}

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

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

		ofSetColor(this->polygons_color[i], this->polygons_life[i]);
		this->polygons[i].get()->draw();
	}

	ofSetColor(32);
	this->eage_1.draw();
	this->eage_2.draw();
}

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

	if (key >= 32 && key < 127) {

		char key_c = (char)key;
		string key_s{ key_c };
		ofTTFCharacter path = this->font.getCharacterAsPoints(key_c);
		ofPoint c_size = ofPoint(this->font.stringWidth(key_s), this->font.stringHeight(key_s));
		ofPoint adjust(ofGetWidth() / 2 - c_size.x / 2, c_size.y);
		ofColor color;
		color.setHsb(ofRandom(255), 255, 225);

		vector<ofPolyline> outline = path.getOutline();

		for (int o_index = 0; o_index < outline.size(); o_index++) {

			outline[o_index] = outline[o_index].getResampledBySpacing(ofRandom(15, 40));
		}

		ofMesh mesh;
		ofTessellator t;
		t.tessellateToMesh(outline, ofPolyWindingMode::OF_POLY_WINDING_ODD, mesh);

		vector<ofMeshFace> triangles = mesh.getUniqueFaces();
		for (int i = 0; i < triangles.size(); i++) {

			shared_ptr<ofxBox2dPolygon> polygon = shared_ptr<ofxBox2dPolygon>(new ofxBox2dPolygon);
			polygon.get()->addTriangle(triangles[i].getVertex(0) + adjust, triangles[i].getVertex(1) + adjust, triangles[i].getVertex(2) + adjust);
			polygon.get()->setPhysics(1.0, 0.3, 0.3);
			polygon.get()->create(box2d.getWorld());

			this->polygons.push_back(polygon);
			this->polygons_life.push_back(255);
			this->polygons_color.push_back(color);
		}

	}
}

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

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

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#include "ofApp.h"

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

void ofApp::setup() {

ofSetFrameRate(60);

ofBackground(255);

ofSetWindowTitle("Insta");

ofSetColor(0);

ofSetRectMode(ofRectMode::OF_RECTMODE_CENTER);

this->font.loadFont("fonts/Kazesawa-Bold.ttf", 130, true, false, true);

this->box2d.init();

this->box2d.setGravity(0, 50);

this->box2d.createBounds();

this->box2d.setFPS(60);

this->box2d.registerGrabbing();

this->eage_1 = ofxBox2dEdge();

this->eage_1.addVertex(ofVec2f(ofGetWidth() / 2 - 150, ofGetHeight() / 2 + 100));

this->eage_1.addVertex(ofVec2f(ofGetWidth() / 2, ofGetHeight() / 2));

this->eage_1.create(this->box2d.getWorld());

this->eage_2 = ofxBox2dEdge();

this->eage_2.addVertex(ofVec2f(ofGetWidth() / 2 + 150, ofGetHeight() / 2 + 100));

this->eage_2.addVertex(ofVec2f(ofGetWidth() / 2, ofGetHeight() / 2));

this->eage_2.create(this->box2d.getWorld());

}

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

void ofApp::update() {

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

this->polygons_life[i] -= 1;

if (this->polygons_life[i] < 20) {

this->polygons[i].get()->destroy();

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

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

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

}

this->box2d.update();

}

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

void ofApp::draw() {

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

ofSetColor(this->polygons_color[i], this->polygons_life[i]);

this->polygons[i].get()->draw();

}

ofSetColor(32);

this->eage_1.draw();

this->eage_2.draw();

}

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

void ofApp::keyPressed(int key) {

if (key >= 32 && key < 127) {

char key_c = (char)key;

string key_s{ key_c };

ofTTFCharacter path = this->font.getCharacterAsPoints(key_c);

ofPoint c_size = ofPoint(this->font.stringWidth(key_s), this->font.stringHeight(key_s));

ofPoint adjust(ofGetWidth() / 2 - c_size.x / 2, c_size.y);

ofColor color;

color.setHsb(ofRandom(255), 255, 225);

vector<ofPolyline> outline = path.getOutline();

for (int o_index = 0; o_index < outline.size(); o_index++) {

outline[o_index] = outline[o_index].getResampledBySpacing(ofRandom(15, 40));

}

ofMesh mesh;

ofTessellator t;

t.tessellateToMesh(outline, ofPolyWindingMode::OF_POLY_WINDING_ODD, mesh);

vector<ofMeshFace> triangles = mesh.getUniqueFaces();

for (int i = 0; i < triangles.size(); i++) {

shared_ptr<ofxBox2dPolygon> polygon = shared_ptr<ofxBox2dPolygon>(new ofxBox2dPolygon);

polygon.get()->addTriangle(triangles[i].getVertex(0) + adjust, triangles[i].getVertex(1) + adjust, triangles[i].getVertex(2) + adjust);

polygon.get()->setPhysics(1.0, 0.3, 0.3);

polygon.get()->create(box2d.getWorld());

this->polygons.push_back(polygon);

this->polygons_life.push_back(255);

this->polygons_color.push_back(color);

}

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

int main() {

ofSetupOpenGL(720, 720, OF_WINDOW);

ofRunApp(new ofApp());

}

[ Link ]
https://github.com/junkiyoshi/Insta20180131

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