box2d – ページ 19 – プログラミング de 落描き

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

[ほしいものリスト]
Amazon

[ Sponsor Link ]

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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[ Sponsor Link ]

2017年12月18日2017年12月15日

Insta20171217

[ Video ]

[ About ]
昨日の花火を近いParticle同士で図形を作るようにしました。
Glass fireworks.

[ Source ]

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

	ofxBox2d box2d;

	ofFbo fbo;

	vector<shared_ptr<ofxBox2dCircle>> circles;
	vector<float> circles_size;
	vector<ofColor> circles_color;
	vector<float> circles_life;

};

#pragma once

#include "ofMain.h"

#include "ofFbo.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) {};

ofxBox2d box2d;

ofFbo fbo;

vector<shared_ptr<ofxBox2dCircle>> circles;

vector<float> circles_size;

vector<ofColor> circles_color;

vector<float> circles_life;

};

#include "ofApp.h"

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

	ofEnableBlendMode(ofBlendMode::OF_BLENDMODE_ADD);

	this->box2d.init();
	this->box2d.setGravity(0, 15);
	this->box2d.createBounds();
	this->box2d.setFPS(30);
	this->box2d.registerGrabbing();

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

}

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

	for (int i = this->circles.size() - 1; i > -1; i--) {
		this->circles_life[i] -= 3.5;

		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);
		}
	}

	this->box2d.update();

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

	for (int i = 0; i < this->circles.size(); i++) {
		vector<ofVec2f> near_point;

		for (int j = i; j < this->circles.size(); j++) {
			float distance = this->circles[i].get()->getPosition().distanceSquared(this->circles[j].get()->getPosition());
			if (distance < 50 * 50) {
				near_point.push_back(this->circles[j].get()->getPosition());
			}
		}

		ofSetColor(this->circles_color[i], 192);
		if (near_point.size() > 2) {
			ofBeginShape();
			for (int i = 0; i < near_point.size(); i++) {
				ofVertex(near_point[i].x, near_point[i].y);
			}
			ofEndShape(true);
		}
		else {
			continue;
		}

	}

	this->fbo.end();
}

//--------------------------------------------------------------
void ofApp::draw() {
	this->fbo.draw(0, 0);
}

//--------------------------------------------------------------
void ofApp::mousePressed(int x, int y, int button) {
	float radius = 10;
	for (int i = 0; i < 5; i++) {
		float color_value = ofRandom(256);
		for (int deg = 0; deg < 360; deg += 10) {
			float tmp_x = radius * cos(deg * DEG_TO_RAD);
			float tmp_y = radius * sin(deg * DEG_TO_RAD);

			this->circles.push_back(shared_ptr<ofxBox2dCircle>(new ofxBox2dCircle));
			this->circles.back().get()->setPhysics(3.0, 0.5, 0.1);
			this->circles.back().get()->setup(this->box2d.getWorld(), x + tmp_x, y + tmp_y, 4);
			this->circles.back().get()->addForce(ofVec2f(tmp_x, tmp_y), 6.0);

			ofColor circle_color;
			circle_color.setHsb(color_value, 255, 255);
			this->circles_color.push_back(circle_color);

			this->circles_life.push_back(255);
		}

		radius += 3;
	}
}

//--------------------------------------------------------------
int main() {
	ofSetupOpenGL(720, 720, OF_WINDOW);
	ofRunApp(new ofApp());
}

100

101

#include "ofApp.h"

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

void ofApp::setup() {

ofSetFrameRate(30);

ofBackground(0);

ofSetWindowTitle("Insta");

ofEnableBlendMode(ofBlendMode::OF_BLENDMODE_ADD);

this->box2d.init();

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

this->box2d.createBounds();

this->box2d.setFPS(30);

this->box2d.registerGrabbing();

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

}

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

void ofApp::update() {

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

this->circles_life[i] -= 3.5;

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);

}

this->box2d.update();

this->fbo.begin();

ofClear(0);

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

vector<ofVec2f> near_point;

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

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

if (distance < 50 * 50) {

near_point.push_back(this->circles[j].get()->getPosition());

}

ofSetColor(this->circles_color[i], 192);

if (near_point.size() > 2) {

ofBeginShape();

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

ofVertex(near_point[i].x, near_point[i].y);

}

ofEndShape(true);

}

else {

continue;

}

this->fbo.end();

}

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

void ofApp::draw() {

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

}

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

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

float radius = 10;

for (int i = 0; i < 5; i++) {

float color_value = ofRandom(256);

for (int deg = 0; deg < 360; deg += 10) {

float tmp_x = radius * cos(deg * DEG_TO_RAD);

float tmp_y = radius * sin(deg * DEG_TO_RAD);

this->circles.push_back(shared_ptr<ofxBox2dCircle>(new ofxBox2dCircle));

this->circles.back().get()->setPhysics(3.0, 0.5, 0.1);

this->circles.back().get()->setup(this->box2d.getWorld(), x + tmp_x, y + tmp_y, 4);

this->circles.back().get()->addForce(ofVec2f(tmp_x, tmp_y), 6.0);

ofColor circle_color;

circle_color.setHsb(color_value, 255, 255);

this->circles_color.push_back(circle_color);

this->circles_life.push_back(255);

}

radius += 3;

}

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

int main() {

ofSetupOpenGL(720, 720, OF_WINDOW);

ofRunApp(new ofApp());

}

[ Link ]
https://github.com/junkiyoshi/Insta20171217

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