プログラミング de 落描き – ページ 816 – クリエイティブ・コーディングによる生成物とソース

2018年5月8日2018年5月8日

OpenCVで影つけ雨降り openFrameworks

[ Video ]

[ About ]
Twitterのタイムラインで水の波紋を作っている方を見かけて「影を活かすならこれじゃん！」と、過去のヤツと昨日のヤツを組み合わせました。

影を足しただけですが、水面と底面が感じられて、透明感が当社比390% UP！

最近は、あえてクラスは起こさずに、ofSeedRandomを使って、生成された固定の乱数とフレーム番号の組み合わせで乗り切ってきたんですが、今回は断念してRippleクラスを作りました。

あとopenFrameworksの0.10.0が出たのでVisual Studio 2017で作りました。あんま自分が触ってる周りでは関係なさそうですが…

[ Source ]

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

	vector<unique_ptr<Ripple>> ripples;

	ofFbo fbo;
	ofPixels pixels;
	cv::Mat pixels_mat;
};

#pragma once

#include "ofMain.h"

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

void dragEvent(ofDragInfo dragInfo) {};

void gotMessage(ofMessage msg) {};

vector<unique_ptr<Ripple>> ripples;

ofFbo fbo;

ofPixels pixels;

cv::Mat pixels_mat;

};

#include "ofApp.h"

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

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

	ofNoFill();
	ofSetLineWidth(1.5);

	// Fbo Initialize (+ Shadow Gap)
	this->fbo.allocate(ofGetWidth() + 25, ofGetHeight() + 25);

	// Link pixels And pixels_mat
	this->fbo.readToPixels(this->pixels);
	this->pixels_mat = cv::Mat(this->pixels.getHeight(), this->pixels.getWidth(), CV_8UC4, this->pixels.getData());
}

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

	// Make New Ripple
	if (ofGetFrameNum() % 3 == 0) {

		ofPoint point(ofRandom(this->fbo.getWidth()), ofRandom(this->fbo.getHeight()), ofRandom(500, 1000));
		unique_ptr<Ripple> ripple(new Ripple(point));
		this->ripples.push_back(move(ripple));
	}

	// Draw Ripples
	this->fbo.begin();
	ofClear(0);

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

		if (this->ripples[i]->isLife()) {

			this->ripples[i]->update();
			this->ripples[i]->draw();
		}
		else {

			this->ripples.erase(this->ripples.begin() + i);
		}
	}

	this->fbo.end();

	// Copy Fbo To pixels
	this->fbo.readToPixels(this->pixels);

	// Gray
	cv::Mat gray_mat;
	cv::cvtColor(this->pixels_mat, gray_mat, cv::COLOR_RGBA2GRAY);
	for (int y = 0; y < this->pixels_mat.cols; y++) {

		for (int x = 0; x < this->pixels_mat.rows; x++) {

			if (gray_mat.at<unsigned char>(y, x) > 0) {

				this->pixels_mat.at<cv::Vec4b>(y, x) = cv::Vec4b(gray_mat.at<unsigned char>(y, x), gray_mat.at<unsigned char>(y, x), gray_mat.at<unsigned char>(y, x), this->pixels_mat.at<cv::Vec4b>(y, x)[3]);
			}
		}
	}

	// Blur Process
	cv::GaussianBlur(this->pixels_mat, this->pixels_mat, cv::Size(19, 19), 10, 10);
}

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

	ofSetColor(255);

	// Draw Shadow
	ofImage draw_image;
	draw_image.setFromPixels(this->pixels);
	draw_image.draw(-5, -5);

	// Draw Fbo Image 
	this->fbo.draw(-25, -25);
}

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

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

#include "ofApp.h"

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

void ofApp::setup() {

ofSetFrameRate(60);

ofBackground(239);

ofSetWindowTitle("Insta");

ofNoFill();

ofSetLineWidth(1.5);

// Fbo Initialize (+ Shadow Gap)

this->fbo.allocate(ofGetWidth() + 25, ofGetHeight() + 25);

// Link pixels And pixels_mat

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

this->pixels_mat = cv::Mat(this->pixels.getHeight(), this->pixels.getWidth(), CV_8UC4, this->pixels.getData());

}

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

void ofApp::update() {

// Make New Ripple

if (ofGetFrameNum() % 3 == 0) {

ofPoint point(ofRandom(this->fbo.getWidth()), ofRandom(this->fbo.getHeight()), ofRandom(500, 1000));

unique_ptr<Ripple> ripple(new Ripple(point));

this->ripples.push_back(move(ripple));

}

// Draw Ripples

this->fbo.begin();

ofClear(0);

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

if (this->ripples[i]->isLife()) {

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

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

}

else {

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

}

this->fbo.end();

// Copy Fbo To pixels

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

// Gray

cv::Mat gray_mat;

cv::cvtColor(this->pixels_mat, gray_mat, cv::COLOR_RGBA2GRAY);

for (int y = 0; y < this->pixels_mat.cols; y++) {

for (int x = 0; x < this->pixels_mat.rows; x++) {

if (gray_mat.at<unsigned char>(y, x) > 0) {

this->pixels_mat.at<cv::Vec4b>(y, x) = cv::Vec4b(gray_mat.at<unsigned char>(y, x), gray_mat.at<unsigned char>(y, x), gray_mat.at<unsigned char>(y, x), this->pixels_mat.at<cv::Vec4b>(y, x)[3]);

}

// Blur Process

cv::GaussianBlur(this->pixels_mat, this->pixels_mat, cv::Size(19, 19), 10, 10);

}

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

void ofApp::draw() {

ofSetColor(255);

// Draw Shadow

ofImage draw_image;

draw_image.setFromPixels(this->pixels);

draw_image.draw(-5, -5);

// Draw Fbo Image

this->fbo.draw(-25, -25);

}

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

int main() {

ofSetupOpenGL(720, 720, OF_WINDOW);

ofRunApp(new ofApp());

}

#pragma once
#include "ofMain.h"

class Ripple
{
public:

	Ripple();
	Ripple(ofPoint point);
	void update();
	void draw();
	bool isLife();
private:

	ofPoint point;
	float radius;
	float radius_max;
	float radius_span;
	ofColor body_color;
	bool life;
};

#pragma once

#include "ofMain.h"

class Ripple

{

public:

Ripple();

Ripple(ofPoint point);

void update();

void draw();

bool isLife();

private:

ofPoint point;

float radius;

float radius_max;

float radius_span;

ofColor body_color;

bool life;

};

#include "Ripple.h"

Ripple::Ripple() : Ripple(ofPoint()) {

}

Ripple::Ripple(ofPoint point) {

	this->point = point;
	this->radius = 1;
	this->radius_max = point.z / 10;
	this->body_color.setHsb(ofRandom(255), 255, 255);
	this->life = true;
}

void Ripple::update() {

	if (this->life == false) {

		return;
	}

	if (this->point.z > 0) {

		this->point -= ofPoint(0, 0, 30);
		return;
	}

	if (this->radius > this->radius_max) {

		this->life = false;
		return;
	}
	else {

		this->radius += 1;
	}
}

void Ripple::draw() {

	ofPushMatrix();
	ofTranslate(this->point);

	if (this->point.z > 0) {

		ofSetColor(this->body_color);
		ofDrawLine(ofPoint(), ofPoint(0, 0, 30));
	}
	else {

		ofSetColor(this->body_color, ofMap(this->radius, 1, this->radius_max, 255, 10));
		ofBeginShape();
		for (int deg = 0; deg < 360; deg++) {

			ofVertex(this->radius * cos(deg * DEG_TO_RAD), this->radius * sin(deg * DEG_TO_RAD));
		}
		ofEndShape(true);
	}

	ofPopMatrix();
}

bool Ripple::isLife() {

	return this->life;
}

#include "Ripple.h"

Ripple::Ripple() : Ripple(ofPoint()) {

}

Ripple::Ripple(ofPoint point) {

this->point = point;

this->radius = 1;

this->radius_max = point.z / 10;

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

this->life = true;

}

void Ripple::update() {

if (this->life == false) {

return;

}

if (this->point.z > 0) {

this->point -= ofPoint(0, 0, 30);

return;

}

if (this->radius > this->radius_max) {

this->life = false;

return;

}

else {

this->radius += 1;

}

void Ripple::draw() {

ofPushMatrix();

ofTranslate(this->point);

if (this->point.z > 0) {

ofSetColor(this->body_color);

ofDrawLine(ofPoint(), ofPoint(0, 0, 30));

}

else {

ofSetColor(this->body_color, ofMap(this->radius, 1, this->radius_max, 255, 10));

ofBeginShape();

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

ofVertex(this->radius * cos(deg * DEG_TO_RAD), this->radius * sin(deg * DEG_TO_RAD));

}

ofEndShape(true);

}

ofPopMatrix();

}

bool Ripple::isLife() {

return this->life;

}

[ Link ]
https://github.com/junkiyoshi/Insta20180508

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2018年5月7日2018年5月7日

ofFboのofPixelsをOpenCVで画像処理 openFrameworks

[ Video ]

[ About ]
以前、作成したofFboのデータを加工する手法に、OpenCVを加え、画像処理を組み込めるようにしました。ofFboへ描写した内容にOpenCVでグレースケール＆ぼかしを加え、結果と元のofFboと組み合わせて描写しています。

ofFboは透過度を持っているので、重ねて描写出来るという事が新しい発見でした。

[ Source ]

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

	ofFbo fbo;
	ofPixels pixels;
	cv::Mat pixels_mat;
};

#pragma once

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

void dragEvent(ofDragInfo dragInfo) {};

void gotMessage(ofMessage msg) {};

ofFbo fbo;

ofPixels pixels;

cv::Mat pixels_mat;

};

#include "ofApp.h"

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

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

	this->fbo.allocate(ofGetWidth() + 25, ofGetHeight() + 25);
	this->fbo.readToPixels(this->pixels);
	// Link pixels And pixels_mat
	this->pixels_mat = cv::Mat(this->pixels.getHeight(), this->pixels.getWidth(), CV_8UC4, this->pixels.getData());
}

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

	ofSeedRandom(39);

	this->fbo.begin();
	ofClear(0);
	ofTranslate(this->fbo.getWidth() / 2, this->fbo.getHeight() / 2);

	ofFill();
	// Draw Small Object 
	ofSetColor(200, 39, 39);
	int radius = 150;
	ofBeginShape();
	for (int deg = 0; deg <= 360; deg += 1) {

		ofPoint point(radius * cos(deg * DEG_TO_RAD), radius * sin(deg * DEG_TO_RAD));
		float noise_value = ofMap(ofNoise(point.x * 0.005, point.y * 0.005, ofGetFrameNum() * 0.005), 0, 1, 0.5, 1);
		ofVertex(point * noise_value);
	}

	ofNextContour();
	radius *= 0.5;
	for (int deg = 0; deg <= 360; deg += 1) {

		ofPoint point(radius * cos(deg * DEG_TO_RAD), radius * sin(deg * DEG_TO_RAD));
		float noise_value = ofMap(ofNoise(point.x * 0.005, point.y * 0.005, ofGetFrameNum() * 0.005), 0, 1, 0.5, 1);
		ofVertex(point * noise_value);
	}
	ofEndShape(true);

	// Draw Big Object 
	ofSetColor(39, 39, 200);
	radius = 350;
	ofBeginShape();
	for (int deg = 0; deg <= 360; deg += 1) {

		ofPoint point(radius * cos(deg * DEG_TO_RAD), radius * sin(deg * DEG_TO_RAD));
		float noise_value = ofMap(ofNoise(point.x * 0.005, point.y * 0.005, ofGetFrameNum() * 0.001), 0, 1, 0.5, 1.0);

		ofVertex(point * noise_value);
	}

	ofNextContour();
	for (int deg = 0; deg <= 360; deg += 1) {

		ofPoint point(radius * cos(deg * DEG_TO_RAD), radius * sin(deg * DEG_TO_RAD));
		float noise_value = ofMap(ofNoise(point.x * 0.005, point.y * 0.005, ofGetFrameNum() * 0.001), 0, 1, 0.5, 1.0);

		ofVertex(point * noise_value * 0.95);
	}
	ofEndShape(true);

	this->fbo.end();
	// Copy Fbo To pixels
	this->fbo.readToPixels(this->pixels);

	// Gray
	cv::Mat gray_mat;
	cv::cvtColor(this->pixels_mat, gray_mat, cv::COLOR_RGBA2GRAY);
	for (int y = 0; y < this->pixels_mat.cols; y++) {

		for (int x = 0; x < this->pixels_mat.rows; x++) {

			if (gray_mat.at<unsigned char>(y, x) > 0) {

				this->pixels_mat.at<cv::Vec4b>(y, x) = cv::Vec4b(gray_mat.at<unsigned char>(y, x), gray_mat.at<unsigned char>(y, x), gray_mat.at<unsigned char>(y, x), this->pixels_mat.at<cv::Vec4b>(y, x)[3]);
			}
		}
	}

	// Blur Process
	cv::GaussianBlur(this->pixels_mat, this->pixels_mat, cv::Size(19, 19), 10, 10);
}

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

	// Draw Shadow
	ofSetColor(255, 192);
	ofImage draw_image;
	draw_image.setFromPixels(this->pixels);
	draw_image.draw(-5, -5);

	// Draw Fbo Image 
	ofSetColor(255);
	this->fbo.draw(-25, -25);
}

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

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

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#include "ofApp.h"

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

void ofApp::setup() {

ofSetFrameRate(60);

ofBackground(239);

ofSetWindowTitle("Insta");

this->fbo.allocate(ofGetWidth() + 25, ofGetHeight() + 25);

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

// Link pixels And pixels_mat

this->pixels_mat = cv::Mat(this->pixels.getHeight(), this->pixels.getWidth(), CV_8UC4, this->pixels.getData());

}

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

void ofApp::update() {

ofSeedRandom(39);

this->fbo.begin();

ofClear(0);

ofTranslate(this->fbo.getWidth() / 2, this->fbo.getHeight() / 2);

ofFill();

// Draw Small Object

ofSetColor(200, 39, 39);

int radius = 150;

ofBeginShape();

for (int deg = 0; deg <= 360; deg += 1) {

ofPoint point(radius * cos(deg * DEG_TO_RAD), radius * sin(deg * DEG_TO_RAD));

float noise_value = ofMap(ofNoise(point.x * 0.005, point.y * 0.005, ofGetFrameNum() * 0.005), 0, 1, 0.5, 1);

ofVertex(point * noise_value);

}

ofNextContour();

radius *= 0.5;

for (int deg = 0; deg <= 360; deg += 1) {

ofPoint point(radius * cos(deg * DEG_TO_RAD), radius * sin(deg * DEG_TO_RAD));

float noise_value = ofMap(ofNoise(point.x * 0.005, point.y * 0.005, ofGetFrameNum() * 0.005), 0, 1, 0.5, 1);

ofVertex(point * noise_value);

}

ofEndShape(true);

// Draw Big Object

ofSetColor(39, 39, 200);

radius = 350;

ofBeginShape();

for (int deg = 0; deg <= 360; deg += 1) {

ofPoint point(radius * cos(deg * DEG_TO_RAD), radius * sin(deg * DEG_TO_RAD));

float noise_value = ofMap(ofNoise(point.x * 0.005, point.y * 0.005, ofGetFrameNum() * 0.001), 0, 1, 0.5, 1.0);

ofVertex(point * noise_value);

}

ofNextContour();

for (int deg = 0; deg <= 360; deg += 1) {

ofPoint point(radius * cos(deg * DEG_TO_RAD), radius * sin(deg * DEG_TO_RAD));

float noise_value = ofMap(ofNoise(point.x * 0.005, point.y * 0.005, ofGetFrameNum() * 0.001), 0, 1, 0.5, 1.0);

ofVertex(point * noise_value * 0.95);

}

ofEndShape(true);

this->fbo.end();

// Copy Fbo To pixels

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

// Gray

cv::Mat gray_mat;

cv::cvtColor(this->pixels_mat, gray_mat, cv::COLOR_RGBA2GRAY);

for (int y = 0; y < this->pixels_mat.cols; y++) {

for (int x = 0; x < this->pixels_mat.rows; x++) {

if (gray_mat.at<unsigned char>(y, x) > 0) {

this->pixels_mat.at<cv::Vec4b>(y, x) = cv::Vec4b(gray_mat.at<unsigned char>(y, x), gray_mat.at<unsigned char>(y, x), gray_mat.at<unsigned char>(y, x), this->pixels_mat.at<cv::Vec4b>(y, x)[3]);

}

// Blur Process

cv::GaussianBlur(this->pixels_mat, this->pixels_mat, cv::Size(19, 19), 10, 10);

}

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

void ofApp::draw() {

// Draw Shadow

ofSetColor(255, 192);

ofImage draw_image;

draw_image.setFromPixels(this->pixels);

draw_image.draw(-5, -5);

// Draw Fbo Image

ofSetColor(255);

this->fbo.draw(-25, -25);

}

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

int main() {

ofSetupOpenGL(720, 720, OF_WINDOW);

ofRunApp(new ofApp());

}

[ Link ]
https://github.com/junkiyoshi/insta20180507

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2018年5月6日2018年5月6日

立方体の座標を走る線 openFrameowrks

[ Video ]

[ About ]
立方体の表面座標をなぞりながら、一方向に向かって動く線をたくさん描写しています。それぞれの線がもつ高さの初期位置を、立方体一辺よりも狭い範囲の乱数にすることで、スパンごとの微妙な隙間が空き、ループしている事がハッキリ可視化することが出来て新しい発見でした。

[ Source ]

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

	ofEasyCam cam;
	ofPoint make_rect_point(float half_len, int deg, int z);
};

#pragma once

#include "ofMain.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) {};

ofEasyCam cam;

ofPoint make_rect_point(float half_len, int deg, int z);

};

#include "ofApp.h"

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

	ofSetFrameRate(30);
	ofBackground(39);
	ofSetWindowTitle("Insta");

	ofEnableDepthTest();
	ofEnableBlendMode(ofBlendMode::OF_BLENDMODE_ADD);
}

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

	ofSeedRandom(39);
}

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

	this->cam.begin();
	ofRotateX(270);
	ofRotateZ(230);

	for (int i = 0; i < 200; i++) {

		vector<ofPoint> points;
		int z_param = ofRandom(250);
		int deg_param = ofRandom(360);
		ofColor color;
		color.setHsb(ofRandom(255), 255, 255);

		for (int i = 0; i < 15; i++) {
			
			int z = (z_param + ((ofGetFrameNum() + i) * 5)) % 500 - 250;
			int deg = deg_param + (ofGetFrameNum() + i) * 5;
			ofPoint point = this->make_rect_point(250, deg, z);
			points.push_back(point);
		}
		
		for (int i = 1; i < points.size(); i++) {

			if (points[i - 1].distance(points[i]) < 100) {
			
				ofSetColor(color, ofMap(points[i - 1].y + points[i - 1].x, -500, 500, 64, 255));
				ofDrawLine(points[i - 1], points[i]);
			}
		}

	}

	this->cam.end();
}

//--------------------------------------------------------------
ofPoint ofApp::make_rect_point(float half_len, int deg, int z) {

	int param = (deg + 45) / 90;
	ofPoint point;

	switch (param % 4) {

	case 0:

		return ofPoint(half_len, ofMap((deg + 45) % 90, 0, 89, -half_len, half_len),z);
	case 1:

		return  ofPoint(ofMap((deg + 45) % 90, 0, 89, half_len, -half_len), half_len, z);
	case 2:

		return ofPoint(-half_len, ofMap((deg + 45) % 90, 0, 89, half_len, -half_len), z);
	case 3:

		return ofPoint(ofMap((deg + 45) % 90, 0, 89, -half_len, half_len), -half_len, z);
	default:

		return ofPoint();
	}
}

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

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

#include "ofApp.h"

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

void ofApp::setup() {

ofSetFrameRate(30);

ofBackground(39);

ofSetWindowTitle("Insta");

ofEnableDepthTest();

ofEnableBlendMode(ofBlendMode::OF_BLENDMODE_ADD);

}

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

void ofApp::update() {

ofSeedRandom(39);

}

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

void ofApp::draw() {

this->cam.begin();

ofRotateX(270);

ofRotateZ(230);

for (int i = 0; i < 200; i++) {

vector<ofPoint> points;

int z_param = ofRandom(250);

int deg_param = ofRandom(360);

ofColor color;

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

for (int i = 0; i < 15; i++) {

int z = (z_param + ((ofGetFrameNum() + i) * 5)) % 500 - 250;

int deg = deg_param + (ofGetFrameNum() + i) * 5;

ofPoint point = this->make_rect_point(250, deg, z);

points.push_back(point);

}

for (int i = 1; i < points.size(); i++) {

if (points[i - 1].distance(points[i]) < 100) {

ofSetColor(color, ofMap(points[i - 1].y + points[i - 1].x, -500, 500, 64, 255));

ofDrawLine(points[i - 1], points[i]);

}

this->cam.end();

}

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

ofPoint ofApp::make_rect_point(float half_len, int deg, int z) {

int param = (deg + 45) / 90;

ofPoint point;

switch (param % 4) {

case 0:

return ofPoint(half_len, ofMap((deg + 45) % 90, 0, 89, -half_len, half_len),z);

case 1:

return ofPoint(ofMap((deg + 45) % 90, 0, 89, half_len, -half_len), half_len, z);

case 2:

return ofPoint(-half_len, ofMap((deg + 45) % 90, 0, 89, half_len, -half_len), z);

case 3:

return ofPoint(ofMap((deg + 45) % 90, 0, 89, -half_len, half_len), -half_len, z);

default:

return ofPoint();

}

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

int main() {

ofSetupOpenGL(720, 720, OF_WINDOW);

ofRunApp(new ofApp());

}

[ Link ]
https://github.com/junkiyoshi/Insta20180506

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