physics – プログラミング de 落描き

2020年4月9日2020年4月9日

A group of bands trapped in a realm. openFrameworks

[ Video ]

[ About ]
領域に閉じ込められた帯の群れ。

A group of bands trapped in a realm.

[ 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>> sphere_list;
	vector<vector<glm::vec3>> log_list;
};

#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>> sphere_list;

vector<vector<glm::vec3>> log_list;

};

#include "ofApp.h"

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

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

	ofBackground(239);
	ofEnableDepthTest();

	// Initialize ofxBulletWorld
	this->cam.setPosition(glm::vec3(0, 3.f, -5.f));
	this->cam.lookAt(glm::vec3(0, 0, 0), glm::vec3(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 = 300;
	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->sphere_list.push_back(move(sphere));

		vector<glm::vec3> log;
		this->log_list.push_back(log);
	}
}

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

	ofSeedRandom(39);

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

		this->log_list[i].push_back(this->sphere_list[i]->getPosition());

		while (this->log_list[i].size() > 30) {

			this->log_list[i].erase(this->log_list[i].begin());
		}
	}

	// 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->sphere_list.size(); i++) {

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

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

				ofVec3f diff = this->sphere_list[i]->getPosition() - this->sphere_list[j]->getPosition();
				ofMap(distance, 0, 80, 20, -2);
				this->sphere_list[i]->applyCentralForce(diff);
				this->sphere_list[j]->applyCentralForce(-diff);
			}
		}
	}

	this->world.update();
}

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

	ofTranslate(ofGetWidth() * 0.5, ofGetHeight() * 0.5);

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

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

		ofSetColor(39);
	}
	bounds_shape->transformGL();
	ofDrawBox(glm::vec3(0, 0, 0), 300);
	bounds_shape->restoreTransformGL();


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

		glm::vec3 param;
		switch ((int)ofRandom(3)) {
		case 0:
			param = glm::vec3(5, 0, 0);
			break;
		case 1:
			param = glm::vec3(0, 5, 0);
			break;
		case 2:
			param = glm::vec3(0, 0, 5);
			break;
		}

		ofMesh face, frame;
		frame.setMode(ofPrimitiveMode::OF_PRIMITIVE_LINES);

		for (int k = 0; k < this->log_list[i].size(); k++) {

			auto& log = this->log_list[i][k];

			face.addVertex(log + param);
			face.addVertex(log - param);

			frame.addVertex(log + param);
			frame.addVertex(log - param);

			if (k > 0) {

				face.addIndex(k * 2); face.addIndex(k * 2 - 1); face.addIndex(k * 2 - 2);
				face.addIndex(k * 2); face.addIndex(k * 2 + 1); face.addIndex(k * 2 - 1);

				frame.addIndex(k * 2); frame.addIndex(k * 2 - 2);
				frame.addIndex(k * 2 + 1); frame.addIndex(k * 2 - 1);
			}
		}

		frame.addIndex(0); frame.addIndex(1);
		frame.addIndex(frame.getNumVertices() - 1); frame.addIndex(frame.getNumVertices() - 2);

		ofSetColor(39);
		face.drawFaces();

		ofSetColor(239);
		frame.drawWireframe();
	}
}

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

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

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#include "ofApp.h"

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

void ofApp::setup() {

ofSetFrameRate(60);

ofSetWindowTitle("openFrameworks");

ofBackground(239);

ofEnableDepthTest();

// Initialize ofxBulletWorld

this->cam.setPosition(glm::vec3(0, 3.f, -5.f));

this->cam.lookAt(glm::vec3(0, 0, 0), glm::vec3(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 = 300;

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->sphere_list.push_back(move(sphere));

vector<glm::vec3> log;

this->log_list.push_back(log);

}

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

void ofApp::update() {

ofSeedRandom(39);

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

this->log_list[i].push_back(this->sphere_list[i]->getPosition());

while (this->log_list[i].size() > 30) {

this->log_list[i].erase(this->log_list[i].begin());

}

// 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->sphere_list.size(); i++) {

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

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

if (distance < 80) {

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

ofMap(distance, 0, 80, 20, -2);

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

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

}

this->world.update();

}

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

void ofApp::draw() {

ofTranslate(ofGetWidth() * 0.5, ofGetHeight() * 0.5);

// Draw Big Box

ofNoFill();

if (ofGetMousePressed()) {

ofSetColor(39, 39, 239);

}

else {

ofSetColor(39);

}

bounds_shape->transformGL();

ofDrawBox(glm::vec3(0, 0, 0), 300);

bounds_shape->restoreTransformGL();

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

glm::vec3 param;

switch ((int)ofRandom(3)) {

case 0:

param = glm::vec3(5, 0, 0);

break;

case 1:

param = glm::vec3(0, 5, 0);

break;

case 2:

param = glm::vec3(0, 0, 5);

break;

}

ofMesh face, frame;

frame.setMode(ofPrimitiveMode::OF_PRIMITIVE_LINES);

for (int k = 0; k < this->log_list[i].size(); k++) {

auto& log = this->log_list[i][k];

face.addVertex(log + param);

face.addVertex(log - param);

frame.addVertex(log + param);

frame.addVertex(log - param);

if (k > 0) {

face.addIndex(k * 2); face.addIndex(k * 2 - 1); face.addIndex(k * 2 - 2);

face.addIndex(k * 2); face.addIndex(k * 2 + 1); face.addIndex(k * 2 - 1);

frame.addIndex(k * 2); frame.addIndex(k * 2 - 2);

frame.addIndex(k * 2 + 1); frame.addIndex(k * 2 - 1);

}

frame.addIndex(0); frame.addIndex(1);

frame.addIndex(frame.getNumVertices() - 1); frame.addIndex(frame.getNumVertices() - 2);

ofSetColor(39);

face.drawFaces();

ofSetColor(239);

frame.drawWireframe();

}

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

int main() {

ofSetupOpenGL(720, 720, OF_WINDOW);

ofRunApp(new ofApp());

}

[ Link ]
https://github.com/junkiyoshi/Insta20200409

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2020年3月11日2020年3月11日

Character is falling. openFrameworks

[ Video ]

[ About ]
速度で変化する文字。

Characters change with velocity.

[ Source ]

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

class dCharacter {

public:

	dCharacter() {};
	void update(vector<string>& words);

	shared_ptr<ofxBox2dRect> rect;
	int index = 0;
};

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) {};

	int font_size;
	ofTrueTypeFont font;
	vector<string> words;

	ofxBox2d box2d;
	vector<dCharacter> drop_char_list;
};

#pragma once

#include "ofMain.h"

#include "ofxBox2d.h"

class dCharacter {

public:

dCharacter() {};

void update(vector<string>& words);

shared_ptr<ofxBox2dRect> rect;

int index = 0;

};

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) {};

int font_size;

ofTrueTypeFont font;

vector<string> words;

ofxBox2d box2d;

vector<dCharacter> drop_char_list;

};

#include "ofApp.h"

//--------------------------------------------------------------
void dCharacter::update(vector<string>& words) {

	if (ofGetFrameNum() % 5 && this->rect->getVelocity().length() > 1.5) {

		this->index = ofRandom(words.size());
	}
}

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

	ofSetFrameRate(60);
	ofSetWindowTitle("openframeworks");

	ofBackground(0);
	ofSetColor(255);

	this->font_size = 20;
	ofTrueTypeFontSettings font_settings("fonts/msgothic.ttc", this->font_size);
	font_settings.antialiased = true;
	font_settings.addRanges(ofAlphabet::Japanese);
	this->font.load(font_settings);

	this->words = {

		u8"!", u8"#", u8"$", u8"%", u8"&",
		u8"'", u8"(", u8")", u8"*", u8"+",
		u8",", u8"-", u8".", u8"/", u8"0",
		u8"1", u8"2", u8"3", u8"4", u8"5",
		u8"6", u8"7", u8"8", u8"9", u8"0",
		u8":", u8";", u8"<", u8"=", u8">",
		u8"?", u8"@",

		u8"A", u8"B", u8"C", u8"D", u8"E",
		u8"F", u8"G", u8"H", u8"I", u8"J",
		u8"K", u8"L", u8"M", u8"N", u8"O",
		u8"P", u8"Q", u8"R", u8"S", u8"T",
		u8"U", u8"V", u8"W", u8"X", u8"Y", u8"Z",

		u8"a", u8"b", u8"c", u8"d", u8"e",
		u8"f", u8"g", u8"h", u8"i", u8"j",
		u8"k", u8"l", u8"m", u8"n", u8"o",
		u8"p", u8"q", u8"r", u8"s", u8"t",
		u8"u", u8"v", u8"w", u8"x", u8"y", u8"z",

		u8"ｱ", u8"ｲ", u8"ｳ", u8"ｴ", u8"ｵ",
		u8"ｶ", u8"ｷ", u8"ｸ", u8"ｹ", u8"ｺ",
		u8"ｻ", u8"ｼ", u8"ｽ", u8"ｾ", u8"ｿ",
		u8"ﾀ", u8"ﾁ", u8"ﾂ", u8"ﾃ", u8"ﾄ",
		u8"ﾅ", u8"ﾆ", u8"ﾇ", u8"ﾈ", u8"ﾉ",
		u8"ﾊ", u8"ﾋ", u8"ﾌ", u8"ﾍ", u8"ﾎ",
		u8"ﾏ", u8"ﾐ", u8"ﾑ", u8"ﾒ", u8"ﾓ",
		u8"ﾔ", u8"ﾕ", u8"ﾖ",
		u8"ﾗ", u8"ﾘ", u8"ﾙ", u8"ﾚ", u8"ﾛ",
		u8"ﾜ", u8"ｦ", u8"ﾝ",
	};

	this->box2d.init();
	this->box2d.setGravity(0, 5);
	this->box2d.createBounds();
	this->box2d.setFPS(60);
	this->box2d.registerGrabbing();
}

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

	if (ofRandom(100) < 25) {

		auto rect = make_shared<ofxBox2dRect>();
		rect->setPhysics(1.0, 0.63, 0.1);
		rect->setup(this->box2d.getWorld(), ofRandom(ofGetWidth()) * this->font_size / this->font_size, 30, this->font_size, this->font_size);

		auto drop_char = dCharacter();
		drop_char.rect = rect;
		drop_char.index = ofRandom(this->words.size());

		this->drop_char_list.push_back(drop_char);
	}

	for (auto& drop_char : this->drop_char_list) {

		drop_char.update(this->words);
	}

	this->box2d.update();
}

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

	for (auto& drop_char : this->drop_char_list) {

		ofPushMatrix();
		ofTranslate(drop_char.rect->getPosition().x, drop_char.rect->getPosition().y);
		ofRotate(drop_char.rect->getRotation());

		this->font.drawString(this->words[drop_char.index], -10.5, 10);

		ofPopMatrix();
	}
}

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

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

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#include "ofApp.h"

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

void dCharacter::update(vector<string>& words) {

if (ofGetFrameNum() % 5 && this->rect->getVelocity().length() > 1.5) {

this->index = ofRandom(words.size());

}

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

void ofApp::setup() {

ofSetFrameRate(60);

ofSetWindowTitle("openframeworks");

ofBackground(0);

ofSetColor(255);

this->font_size = 20;

ofTrueTypeFontSettings font_settings("fonts/msgothic.ttc", this->font_size);

font_settings.antialiased = true;

font_settings.addRanges(ofAlphabet::Japanese);

this->font.load(font_settings);

this->words = {

u8"!", u8"#", u8"$", u8"%", u8"&",

u8"'", u8"(", u8")", u8"*", u8"+",

u8",", u8"-", u8".", u8"/", u8"0",

u8"1", u8"2", u8"3", u8"4", u8"5",

u8"6", u8"7", u8"8", u8"9", u8"0",

u8":", u8";", u8"<", u8"=", u8">",

u8"?", u8"@",

u8"A", u8"B", u8"C", u8"D", u8"E",

u8"F", u8"G", u8"H", u8"I", u8"J",

u8"K", u8"L", u8"M", u8"N", u8"O",

u8"P", u8"Q", u8"R", u8"S", u8"T",

u8"U", u8"V", u8"W", u8"X", u8"Y", u8"Z",

u8"a", u8"b", u8"c", u8"d", u8"e",

u8"f", u8"g", u8"h", u8"i", u8"j",

u8"k", u8"l", u8"m", u8"n", u8"o",

u8"p", u8"q", u8"r", u8"s", u8"t",

u8"u", u8"v", u8"w", u8"x", u8"y", u8"z",

u8"ｱ", u8"ｲ", u8"ｳ", u8"ｴ", u8"ｵ",

u8"ｶ", u8"ｷ", u8"ｸ", u8"ｹ", u8"ｺ",

u8"ｻ", u8"ｼ", u8"ｽ", u8"ｾ", u8"ｿ",

u8"ﾀ", u8"ﾁ", u8"ﾂ", u8"ﾃ", u8"ﾄ",

u8"ﾅ", u8"ﾆ", u8"ﾇ", u8"ﾈ", u8"ﾉ",

u8"ﾊ", u8"ﾋ", u8"ﾌ", u8"ﾍ", u8"ﾎ",

u8"ﾏ", u8"ﾐ", u8"ﾑ", u8"ﾒ", u8"ﾓ",

u8"ﾔ", u8"ﾕ", u8"ﾖ",

u8"ﾗ", u8"ﾘ", u8"ﾙ", u8"ﾚ", u8"ﾛ",

u8"ﾜ", u8"ｦ", u8"ﾝ",

};

this->box2d.init();

this->box2d.setGravity(0, 5);

this->box2d.createBounds();

this->box2d.setFPS(60);

this->box2d.registerGrabbing();

}

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

void ofApp::update() {

if (ofRandom(100) < 25) {

auto rect = make_shared<ofxBox2dRect>();

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

rect->setup(this->box2d.getWorld(), ofRandom(ofGetWidth()) * this->font_size / this->font_size, 30, this->font_size, this->font_size);

auto drop_char = dCharacter();

drop_char.rect = rect;

drop_char.index = ofRandom(this->words.size());

this->drop_char_list.push_back(drop_char);

}

for (auto& drop_char : this->drop_char_list) {

drop_char.update(this->words);

}

this->box2d.update();

}

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

void ofApp::draw() {

for (auto& drop_char : this->drop_char_list) {

ofPushMatrix();

ofTranslate(drop_char.rect->getPosition().x, drop_char.rect->getPosition().y);

ofRotate(drop_char.rect->getRotation());

this->font.drawString(this->words[drop_char.index], -10.5, 10);

ofPopMatrix();

}

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

int main() {

ofSetupOpenGL(720, 720, OF_WINDOW);

ofRunApp(new ofApp());

}

[ Link ]
https://github.com/junkiyoshi/Insta20200311

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2018年12月14日2018年12月14日

Force field. openFrameworks

[ Video ]

[ About ]
中央の力場で右往左往するパーティクル

Particle move by force field.

[ 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 windowResized(int w, int h) {};
	void dragEvent(ofDragInfo dragInfo) {};
	void gotMessage(ofMessage msg) {};

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

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

void dragEvent(ofDragInfo dragInfo) {};

void gotMessage(ofMessage msg) {};

ofxBox2d box2d;

vector<shared_ptr<ofxBox2dCircle>> circles;

vector<ofColor> circles_color;

vector<deque<ofPoint>> circles_log;

};

#include "ofApp.h"

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

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

	ofBackground(239);
	ofSetLineWidth(3);

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

	for (int i = 0; i < 25; i++) {

		auto circle = make_shared<ofxBox2dCircle>();
		circle.get()->setPhysics(0.5, 1.0, 1.0);
		circle.get()->setup(this->box2d.getWorld(), ofRandom(0, ofGetWidth()), ofRandom(0, ofGetHeight()), 8);
		this->circles.push_back(move(circle));

		ofColor c;
		c.setHsb(i * 10, 255, 230);
		this->circles_color.push_back(c);

		deque<ofPoint> log;
		this->circles_log.push_back(log);
	}
}

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

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

		int span = 30;
		for (int x = ofGetWidth() * 0.2; x <= ofGetWidth() * 0.8; x += span) {

			for (int y = ofGetHeight() * 0.2; y <= ofGetHeight() * 0.8; y += span) {

				if ((this->circles[i]->getPosition().x > x - span * 0.5 && this->circles[i]->getPosition().x < x + span * 0.5) &&
					(this->circles[i]->getPosition().y > y - span * 0.5 && this->circles[i]->getPosition().y < y + span * 0.5))
				{
					float noise_deg = ofNoise(x * 0.0005, y * 0.0005, ofGetFrameNum() * 0.01) * 360;
					ofPoint power = ofPoint(cos(noise_deg * DEG_TO_RAD), sin(noise_deg * DEG_TO_RAD));
					this->circles[i]->addForce(power, 1.0);
				}
			}
		}
	}

	this->box2d.update();

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

		this->circles_log[i].push_front(this->circles[i]->getPosition());
		while (this->circles_log[i].size() > 10) {

			this->circles_log[i].pop_back();
		}
	}
}

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

	ofFill();
	ofSetColor(39);

	int span = 30;
	for (int x = ofGetWidth() * 0.2; x <= ofGetWidth() * 0.8; x += span) {

		for (int y = ofGetHeight() * 0.2; y <= ofGetHeight() * 0.8; y += span) {

			float noise_deg = ofNoise(x * 0.0005, y * 0.0005, ofGetFrameNum() * 0.01) * 360;

			ofBeginShape();
			ofVertex((x + span * 0.5) + span * 0.35 * cos(noise_deg * DEG_TO_RAD), (y + span * 0.5) + span * 0.35 * sin(noise_deg * DEG_TO_RAD));
			ofVertex((x + span * 0.5) + span * 0.35 * cos((noise_deg + 135) * DEG_TO_RAD), (y + span * 0.5) + span * 0.35 * sin((noise_deg + 135) * DEG_TO_RAD));
			ofVertex((x + span * 0.5) + span * 0.35 * cos((noise_deg + 225) * DEG_TO_RAD), (y + span * 0.5) + span * 0.35 * sin((noise_deg + 225) * DEG_TO_RAD));
			ofEndShape(true);
		}
	}

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

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

		ofNoFill();
		ofBeginShape();
		for (int log_index = 0; log_index < this->circles_log[i].size(); log_index++) {

			ofVertex(this->circles_log[i][log_index]);
		}
		ofEndShape(false);
	}
}

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

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

100

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102

103

104

105

106

107

108

#include "ofApp.h"

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

void ofApp::setup() {

ofSetFrameRate(60);

ofSetWindowTitle("openFrameworks");

ofBackground(239);

ofSetLineWidth(3);

this->box2d.init();

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

this->box2d.createBounds();

this->box2d.setFPS(60);

for (int i = 0; i < 25; i++) {

auto circle = make_shared<ofxBox2dCircle>();

circle.get()->setPhysics(0.5, 1.0, 1.0);

circle.get()->setup(this->box2d.getWorld(), ofRandom(0, ofGetWidth()), ofRandom(0, ofGetHeight()), 8);

this->circles.push_back(move(circle));

ofColor c;

c.setHsb(i * 10, 255, 230);

this->circles_color.push_back(c);

deque<ofPoint> log;

this->circles_log.push_back(log);

}

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

void ofApp::update() {

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

int span = 30;

for (int x = ofGetWidth() * 0.2; x <= ofGetWidth() * 0.8; x += span) {

for (int y = ofGetHeight() * 0.2; y <= ofGetHeight() * 0.8; y += span) {

if ((this->circles[i]->getPosition().x > x - span * 0.5 && this->circles[i]->getPosition().x < x + span * 0.5) &&

(this->circles[i]->getPosition().y > y - span * 0.5 && this->circles[i]->getPosition().y < y + span * 0.5))

{

float noise_deg = ofNoise(x * 0.0005, y * 0.0005, ofGetFrameNum() * 0.01) * 360;

ofPoint power = ofPoint(cos(noise_deg * DEG_TO_RAD), sin(noise_deg * DEG_TO_RAD));

this->circles[i]->addForce(power, 1.0);

}

this->box2d.update();

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

this->circles_log[i].push_front(this->circles[i]->getPosition());

while (this->circles_log[i].size() > 10) {

this->circles_log[i].pop_back();

}

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

void ofApp::draw() {

ofFill();

ofSetColor(39);

int span = 30;

for (int x = ofGetWidth() * 0.2; x <= ofGetWidth() * 0.8; x += span) {

for (int y = ofGetHeight() * 0.2; y <= ofGetHeight() * 0.8; y += span) {

float noise_deg = ofNoise(x * 0.0005, y * 0.0005, ofGetFrameNum() * 0.01) * 360;

ofBeginShape();

ofVertex((x + span * 0.5) + span * 0.35 * cos(noise_deg * DEG_TO_RAD), (y + span * 0.5) + span * 0.35 * sin(noise_deg * DEG_TO_RAD));

ofVertex((x + span * 0.5) + span * 0.35 * cos((noise_deg + 135) * DEG_TO_RAD), (y + span * 0.5) + span * 0.35 * sin((noise_deg + 135) * DEG_TO_RAD));

ofVertex((x + span * 0.5) + span * 0.35 * cos((noise_deg + 225) * DEG_TO_RAD), (y + span * 0.5) + span * 0.35 * sin((noise_deg + 225) * DEG_TO_RAD));

ofEndShape(true);

}

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

ofFill();

ofSetColor(this->circles_color[i]);

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

ofNoFill();

ofBeginShape();

for (int log_index = 0; log_index < this->circles_log[i].size(); log_index++) {

ofVertex(this->circles_log[i][log_index]);

}

ofEndShape(false);

}

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

int main() {

ofSetupOpenGL(720, 720, OF_WINDOW);

ofRunApp(new ofApp());

}

[ Link ]
https://github.com/junkiyoshi/Insta20181214

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