physics – ページ 5 – プログラミング de 落描き

2018年2月4日2018年2月3日

動画のフレーム差分でParticleを生成 openFrameworks OpenCV ofxBox2d

[ Video ]

[ About ]
昨日のWebカメラを動画データに置き換えました。重かったので、書き出した画像をつなげて動画にしてあります。

[ 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;
	ofPixels pixels;
	ofImage save_image;

	ofxBox2d box2d;
	vector<shared_ptr<ofxBox2dCircle>> circles;
	vector<float> circles_life;
	vector<ofColor> circles_color;
	
	cv::VideoCapture cap;
	ofVec2f cap_size;
	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;

ofPixels pixels;

ofImage save_image;

ofxBox2d box2d;

vector<shared_ptr<ofxBox2dCircle>> circles;

vector<float> circles_life;

vector<ofColor> circles_color;

cv::VideoCapture cap;

ofVec2f cap_size;

cv::Mat pre_frame;

cv::Mat frame;

ofImage image;

};

#include "ofApp.h"

//--------------------------------------------------------------
void ofApp::setup() {
	ofSetFrameRate(25);
	ofBackground(0);
	ofSetWindowTitle("Insta");

	this->box2d.init();
	this->box2d.setGravity(0, 50);
	this->box2d.createBounds();
	this->box2d.setFPS(25);
	//this->box2d.registerGrabbing();

	this->cap.open("city3.mp4");
	this->cap_size = ofVec2f(this->cap.get(CV_CAP_PROP_FRAME_WIDTH), this->cap.get(CV_CAP_PROP_FRAME_HEIGHT));
	this->cap_size *= 0.33;

	this->image.allocate(this->cap_size.x, this->cap_size.y, 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;
	
	if (src.empty()) {
		return;
	}

	cv::flip(src, src, 1);
	cv::cvtColor(src, src, cv::COLOR_BGR2RGB);
	cv::resize(src, this->frame, cv::Size(this->cap_size.x, this->cap_size.y));

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

		cv::Mat gap = this->pre_frame - this->frame;
		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 / 4);
					this->circles.push_back(circle);

					this->circles_life.push_back(255);

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

				}
			}
		}
	}
	this->frame.copyTo(this->pre_frame);
	this->image.update();

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

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

	for (int i = this->circles.size() - 1; i >= 0; i--) {
		
		this->circles_life[i] -= 8;
		if (this->circles_life[i] < 0) {

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

			ofSetColor(this->circles_color[i], this->circles_life[i] + 128);
			ofDrawCircle(this->circles[i].get()->getPosition(), this->circles[i].get()->getRadius());
		}
	}

	this->fbo.end();

	//this->fbo.readToPixels(pixels);
	//this->save_image.setFromPixels(pixels);
	//this->save_image.save(std::to_string(ofGetFrameNum()) + ".png", OF_IMAGE_QUALITY_BEST);

	this->box2d.update();
}

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

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

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

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

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#include "ofApp.h"

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

void ofApp::setup() {

ofSetFrameRate(25);

ofBackground(0);

ofSetWindowTitle("Insta");

this->box2d.init();

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

this->box2d.createBounds();

this->box2d.setFPS(25);

//this->box2d.registerGrabbing();

this->cap.open("city3.mp4");

this->cap_size = ofVec2f(this->cap.get(CV_CAP_PROP_FRAME_WIDTH), this->cap.get(CV_CAP_PROP_FRAME_HEIGHT));

this->cap_size *= 0.33;

this->image.allocate(this->cap_size.x, this->cap_size.y, 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;

if (src.empty()) {

return;

}

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

cv::cvtColor(src, src, cv::COLOR_BGR2RGB);

cv::resize(src, this->frame, cv::Size(this->cap_size.x, this->cap_size.y));

float span = 10;

if(ofGetFrameNum() > 10) {

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

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 / 4);

this->circles.push_back(circle);

this->circles_life.push_back(255);

ofColor c;

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

this->circles_color.push_back(c);

}

this->frame.copyTo(this->pre_frame);

this->image.update();

this->fbo.begin();

ofClear(0);

ofBackground(0);

ofSetColor(255);

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

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

this->circles_life[i] -= 8;

if (this->circles_life[i] < 0) {

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

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

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

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

}

else {

ofSetColor(this->circles_color[i], this->circles_life[i] + 128);

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

}

this->fbo.end();

//this->fbo.readToPixels(pixels);

//this->save_image.setFromPixels(pixels);

//this->save_image.save(std::to_string(ofGetFrameNum()) + ".png", OF_IMAGE_QUALITY_BEST);

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/Insta20180203

[ほしいものリスト]
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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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Amazon

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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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