openframeworks – ページ 215 – プログラミング de 落描き

2021年11月25日2021年11月25日

Mountains of Noise. Draw by openFrameworks

[ Video ]

[ About ]
二つの距離で最大の高さを調整する。

Adjust the maximum height in two distances.

[ 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;
	ofMesh face, line;
};

#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;

ofMesh face, line;

};

#include "ofApp.h"

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

	ofSetFrameRate(30);
	ofSetWindowTitle("openframeworks");

	ofBackground(0);
	ofSetLineWidth(2);
	ofEnableDepthTest();

	this->line.setMode(ofPrimitiveMode::OF_PRIMITIVE_LINES);
}

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

	ofSeedRandom(39);

	this->face.clear();
	this->line.clear();

	auto x_span = 1;
	auto z_span = 20;
	for (auto z = -100; z <= 100; z += z_span) {

		auto hue = ofRandom(255);
		ofColor color;
		color.setHsb(hue, 180, 255);

		auto noise_seed = ofRandom(1000);
		auto param_noise_seed = ofRandom(1000);
		auto start_index = this->face.getNumVertices();

		auto param_noise_value = ofNoise(z * 0.035, ofGetFrameNum() * 0.0001);

		for (auto x = -500; x <= 500; x += x_span) {

			vector<glm::vec3> vertices;

			auto noise_value = ofNoise(z * 0.05, x * 0.035, ofGetFrameNum() * 0.005);
			auto next_noise_value = ofNoise(z * 0.05, (x + x_span) * 0.035, ofGetFrameNum() * 0.005);

			if (abs(x) <= 150) {

				auto param = ofMap(param_noise_value, 0, 1, -150, 150);
				auto distance = abs(x - param);
				noise_value = noise_value * (distance > 30 ? 0.1 : ofMap(distance, 0, 30, 0.5, 0.1)) * (abs(x) < 100 ? 1 : ofMap(abs(x), 100, 150, 1, 0));
			}
			else {

				noise_value = 0;
			}

			if (abs(x + x_span) <= 150) {

				auto param = ofMap(param_noise_value, 0, 1, -150, 150);
				auto distance = abs((x + x_span) - param);
				next_noise_value = next_noise_value * (distance > 30 ? 0.1 : ofMap(distance, 0, 30, 0.5, 0.1)) * (abs(x + x_span) < 100 ? 1 : ofMap(abs(x + x_span), 100, 150, 1, 0));
			}
			else {

				next_noise_value = 0;
			}

			auto height = ofMap(noise_value, 0, 1, -150, 350);
			auto next_height = ofMap(next_noise_value, 0, 1, -150, 350);

			vertices.push_back(glm::vec3(x, -150, z - 4.5));
			vertices.push_back(glm::vec3(x + x_span, -150, z - 4.5));
			vertices.push_back(glm::vec3(x + x_span, next_height, z - 4.5));
			vertices.push_back(glm::vec3(x, height, z - 4.5));

			vertices.push_back(glm::vec3(x, -150, z + 4.5));
			vertices.push_back(glm::vec3(x + x_span, -150, z + 4.5));
			vertices.push_back(glm::vec3(x + x_span, next_height, z + 4.5));
			vertices.push_back(glm::vec3(x, height, z + 4.5));

			auto index = this->face.getNumVertices();
			this->face.addVertices(vertices);

			this->face.addIndex(index + 0); this->face.addIndex(index + 1); this->face.addIndex(index + 2);
			this->face.addIndex(index + 0); this->face.addIndex(index + 2); this->face.addIndex(index + 3);

			this->face.addIndex(index + 4); this->face.addIndex(index + 5); this->face.addIndex(index + 6);
			this->face.addIndex(index + 4); this->face.addIndex(index + 6); this->face.addIndex(index + 7);

			this->face.addIndex(index + 0); this->face.addIndex(index + 4); this->face.addIndex(index + 5);
			this->face.addIndex(index + 0); this->face.addIndex(index + 5); this->face.addIndex(index + 1);

			this->face.addIndex(index + 2); this->face.addIndex(index + 6); this->face.addIndex(index + 7);
			this->face.addIndex(index + 2); this->face.addIndex(index + 7); this->face.addIndex(index + 3);

			this->line.addVertices(vertices);

			this->line.addIndex(index + 0); this->line.addIndex(index + 1);
			this->line.addIndex(index + 2); this->line.addIndex(index + 3);
			this->line.addIndex(index + 4); this->line.addIndex(index + 5);
			this->line.addIndex(index + 6); this->line.addIndex(index + 7);

			for (int i = index; i < index + 8; i++) {

				this->face.addColor(ofColor(0));
				this->line.addColor(ofColor(255));
			}
		}

		this->face.addIndex(start_index + 0); this->face.addIndex(start_index + 4); this->face.addIndex(start_index + 7);
		this->face.addIndex(start_index + 0); this->face.addIndex(start_index + 7); this->face.addIndex(start_index + 3);

		this->line.addIndex(start_index + 0); this->line.addIndex(start_index + 3);
		this->line.addIndex(start_index + 0); this->line.addIndex(start_index + 4);
		this->line.addIndex(start_index + 7); this->line.addIndex(start_index + 3);
		this->line.addIndex(start_index + 7); this->line.addIndex(start_index + 4);

		auto index = this->face.getNumVertices() - 8;

		this->face.addIndex(index + 1); this->face.addIndex(index + 2); this->face.addIndex(index + 6);
		this->face.addIndex(index + 1); this->face.addIndex(index + 6); this->face.addIndex(index + 5);

		this->line.addIndex(index + 1); this->line.addIndex(index + 2);
		this->line.addIndex(index + 1); this->line.addIndex(index + 5);
		this->line.addIndex(index + 6); this->line.addIndex(index + 2);
		this->line.addIndex(index + 6); this->line.addIndex(index + 5);
	}
}

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

	this->cam.begin();
	ofRotateY(180 + ofGetFrameNum() * 0.75);

	this->face.draw();
	this->line.drawWireframe();

	this->cam.end();
}

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

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

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#include "ofApp.h"

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

void ofApp::setup() {

ofSetFrameRate(30);

ofSetWindowTitle("openframeworks");

ofBackground(0);

ofSetLineWidth(2);

ofEnableDepthTest();

this->line.setMode(ofPrimitiveMode::OF_PRIMITIVE_LINES);

}

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

void ofApp::update() {

ofSeedRandom(39);

this->face.clear();

this->line.clear();

auto x_span = 1;

auto z_span = 20;

for (auto z = -100; z <= 100; z += z_span) {

auto hue = ofRandom(255);

ofColor color;

color.setHsb(hue, 180, 255);

auto noise_seed = ofRandom(1000);

auto param_noise_seed = ofRandom(1000);

auto start_index = this->face.getNumVertices();

auto param_noise_value = ofNoise(z * 0.035, ofGetFrameNum() * 0.0001);

for (auto x = -500; x <= 500; x += x_span) {

vector<glm::vec3> vertices;

auto noise_value = ofNoise(z * 0.05, x * 0.035, ofGetFrameNum() * 0.005);

auto next_noise_value = ofNoise(z * 0.05, (x + x_span) * 0.035, ofGetFrameNum() * 0.005);

if (abs(x) <= 150) {

auto param = ofMap(param_noise_value, 0, 1, -150, 150);

auto distance = abs(x - param);

noise_value = noise_value * (distance > 30 ? 0.1 : ofMap(distance, 0, 30, 0.5, 0.1)) * (abs(x) < 100 ? 1 : ofMap(abs(x), 100, 150, 1, 0));

}

else {

noise_value = 0;

}

if (abs(x + x_span) <= 150) {

auto param = ofMap(param_noise_value, 0, 1, -150, 150);

auto distance = abs((x + x_span) - param);

next_noise_value = next_noise_value * (distance > 30 ? 0.1 : ofMap(distance, 0, 30, 0.5, 0.1)) * (abs(x + x_span) < 100 ? 1 : ofMap(abs(x + x_span), 100, 150, 1, 0));

}

else {

next_noise_value = 0;

}

auto height = ofMap(noise_value, 0, 1, -150, 350);

auto next_height = ofMap(next_noise_value, 0, 1, -150, 350);

vertices.push_back(glm::vec3(x, -150, z - 4.5));

vertices.push_back(glm::vec3(x + x_span, -150, z - 4.5));

vertices.push_back(glm::vec3(x + x_span, next_height, z - 4.5));

vertices.push_back(glm::vec3(x, height, z - 4.5));

vertices.push_back(glm::vec3(x, -150, z + 4.5));

vertices.push_back(glm::vec3(x + x_span, -150, z + 4.5));

vertices.push_back(glm::vec3(x + x_span, next_height, z + 4.5));

vertices.push_back(glm::vec3(x, height, z + 4.5));

auto index = this->face.getNumVertices();

this->face.addVertices(vertices);

this->face.addIndex(index + 0); this->face.addIndex(index + 1); this->face.addIndex(index + 2);

this->face.addIndex(index + 0); this->face.addIndex(index + 2); this->face.addIndex(index + 3);

this->face.addIndex(index + 4); this->face.addIndex(index + 5); this->face.addIndex(index + 6);

this->face.addIndex(index + 4); this->face.addIndex(index + 6); this->face.addIndex(index + 7);

this->face.addIndex(index + 0); this->face.addIndex(index + 4); this->face.addIndex(index + 5);

this->face.addIndex(index + 0); this->face.addIndex(index + 5); this->face.addIndex(index + 1);

this->face.addIndex(index + 2); this->face.addIndex(index + 6); this->face.addIndex(index + 7);

this->face.addIndex(index + 2); this->face.addIndex(index + 7); this->face.addIndex(index + 3);

this->line.addVertices(vertices);

this->line.addIndex(index + 0); this->line.addIndex(index + 1);

this->line.addIndex(index + 2); this->line.addIndex(index + 3);

this->line.addIndex(index + 4); this->line.addIndex(index + 5);

this->line.addIndex(index + 6); this->line.addIndex(index + 7);

for (int i = index; i < index + 8; i++) {

this->face.addColor(ofColor(0));

this->line.addColor(ofColor(255));

}

this->face.addIndex(start_index + 0); this->face.addIndex(start_index + 4); this->face.addIndex(start_index + 7);

this->face.addIndex(start_index + 0); this->face.addIndex(start_index + 7); this->face.addIndex(start_index + 3);

this->line.addIndex(start_index + 0); this->line.addIndex(start_index + 3);

this->line.addIndex(start_index + 0); this->line.addIndex(start_index + 4);

this->line.addIndex(start_index + 7); this->line.addIndex(start_index + 3);

this->line.addIndex(start_index + 7); this->line.addIndex(start_index + 4);

auto index = this->face.getNumVertices() - 8;

this->face.addIndex(index + 1); this->face.addIndex(index + 2); this->face.addIndex(index + 6);

this->face.addIndex(index + 1); this->face.addIndex(index + 6); this->face.addIndex(index + 5);

this->line.addIndex(index + 1); this->line.addIndex(index + 2);

this->line.addIndex(index + 1); this->line.addIndex(index + 5);

this->line.addIndex(index + 6); this->line.addIndex(index + 2);

this->line.addIndex(index + 6); this->line.addIndex(index + 5);

}

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

void ofApp::draw() {

this->cam.begin();

ofRotateY(180 + ofGetFrameNum() * 0.75);

this->face.draw();

this->line.drawWireframe();

this->cam.end();

}

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

int main() {

ofSetupOpenGL(720, 720, OF_WINDOW);

ofRunApp(new ofApp());

}

[ Link ]
https://github.com/junkiyoshi/Insta20211125

[ほしいものリスト]
Amazon

[ Sponsor Link ]

2021年11月24日2021年11月24日

Not written, but visible line. Draw by openFrameworks

[ Video ]

[ About ]
矢印の向く方をノイズで求める。

Find the direction the arrow is pointing with noise.

[ 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) {};

	void draw_arrow(glm::vec2 location, glm::vec2 target, float size, ofColor fill_color, ofColor no_fill_color);
};

#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) {};

void draw_arrow(glm::vec2 location, glm::vec2 target, float size, ofColor fill_color, ofColor no_fill_color);

};

#include "ofApp.h"

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

	ofSetFrameRate(30);
	ofSetWindowTitle("openframeworks");

	ofBackground(0);
	ofSetLineWidth(1);
}

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

	ofSeedRandom(39);
}

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

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

	for (int x = -325; x <= 325; x += 40) {

		for (int y = -325; y <= 325; y += 40) {

			auto target = glm::vec2(x, ofMap(ofNoise(x * 0.003 + ofGetFrameNum() * 0.1), 0, 1, -400, 400));
			this->draw_arrow(glm::vec2(x, y), target, 15, ofColor(0), ofColor(255));
		}
	}
}

//--------------------------------------------------------------
void ofApp::draw_arrow(glm::vec2 location, glm::vec2 target, float size, ofColor fill_color, ofColor no_fill_color) {

	auto angle = std::atan2(target.y - location.y, target.x - location.x);

	ofSetColor(fill_color);
	ofFill();
	ofBeginShape();
	ofVertex(location + glm::vec2(size * cos(angle), size * sin(angle)));
	ofVertex(location + glm::vec2(size * 0.5 * cos(angle + PI * 0.5), size * 0.5 * sin(angle + PI * 0.5)));
	ofVertex(location + glm::vec2(size * 0.5 * cos(angle - PI * 0.5), size * 0.5 * sin(angle - PI * 0.5)));
	ofEndShape();

	ofBeginShape();
	ofVertex(location + glm::vec2(size * 0.5 * cos(angle + PI * 0.5), size * 0.5 * sin(angle + PI * 0.5)) * 0.25);
	ofVertex(location + glm::vec2(size * 0.5 * cos(angle + PI * 0.5), size * 0.5 * sin(angle + PI * 0.5)) * 0.25 - glm::vec2(size * cos(angle), size * sin(angle)) * 0.5);
	ofVertex(location + glm::vec2(size * 0.5 * cos(angle - PI * 0.5), size * 0.5 * sin(angle - PI * 0.5)) * 0.25 - glm::vec2(size * cos(angle), size * sin(angle)) * 0.5);
	ofVertex(location + glm::vec2(size * 0.5 * cos(angle - PI * 0.5), size * 0.5 * sin(angle - PI * 0.5)) * 0.25);
	ofEndShape();

	ofSetColor(no_fill_color);
	ofNoFill();
	ofBeginShape();
	ofVertex(location + glm::vec2(size * 0.5 * cos(angle + PI * 0.5), size * 0.5 * sin(angle + PI * 0.5)) * 0.25);
	ofVertex(location + glm::vec2(size * 0.5 * cos(angle + PI * 0.5), size * 0.5 * sin(angle + PI * 0.5)));
	ofVertex(location + glm::vec2(size * cos(angle), size * sin(angle)));
	ofVertex(location + glm::vec2(size * 0.5 * cos(angle - PI * 0.5), size * 0.5 * sin(angle - PI * 0.5)));
	ofVertex(location + glm::vec2(size * 0.5 * cos(angle - PI * 0.5), size * 0.5 * sin(angle - PI * 0.5)) * 0.25);
	ofEndShape();

	ofBeginShape();
	ofVertex(location + glm::vec2(size * 0.5 * cos(angle - PI * 0.5), size * 0.5 * sin(angle - PI * 0.5)) * 0.25);
	ofVertex(location + glm::vec2(size * 0.5 * cos(angle - PI * 0.5), size * 0.5 * sin(angle - PI * 0.5)) * 0.25 - glm::vec2(size * cos(angle), size * sin(angle)) * 0.5);
	ofVertex(location + glm::vec2(size * 0.5 * cos(angle + PI * 0.5), size * 0.5 * sin(angle + PI * 0.5)) * 0.25 - glm::vec2(size * cos(angle), size * sin(angle)) * 0.5);
	ofVertex(location + glm::vec2(size * 0.5 * cos(angle + PI * 0.5), size * 0.5 * sin(angle + PI * 0.5)) * 0.25);
	ofEndShape();
}

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

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

#include "ofApp.h"

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

void ofApp::setup() {

ofSetFrameRate(30);

ofSetWindowTitle("openframeworks");

ofBackground(0);

ofSetLineWidth(1);

}

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

void ofApp::update() {

ofSeedRandom(39);

}

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

void ofApp::draw() {

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

for (int x = -325; x <= 325; x += 40) {

for (int y = -325; y <= 325; y += 40) {

auto target = glm::vec2(x, ofMap(ofNoise(x * 0.003 + ofGetFrameNum() * 0.1), 0, 1, -400, 400));

this->draw_arrow(glm::vec2(x, y), target, 15, ofColor(0), ofColor(255));

}

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

void ofApp::draw_arrow(glm::vec2 location, glm::vec2 target, float size, ofColor fill_color, ofColor no_fill_color) {

auto angle = std::atan2(target.y - location.y, target.x - location.x);

ofSetColor(fill_color);

ofFill();

ofBeginShape();

ofVertex(location + glm::vec2(size * cos(angle), size * sin(angle)));

ofVertex(location + glm::vec2(size * 0.5 * cos(angle + PI * 0.5), size * 0.5 * sin(angle + PI * 0.5)));

ofVertex(location + glm::vec2(size * 0.5 * cos(angle - PI * 0.5), size * 0.5 * sin(angle - PI * 0.5)));

ofEndShape();

ofBeginShape();

ofVertex(location + glm::vec2(size * 0.5 * cos(angle + PI * 0.5), size * 0.5 * sin(angle + PI * 0.5)) * 0.25);

ofVertex(location + glm::vec2(size * 0.5 * cos(angle + PI * 0.5), size * 0.5 * sin(angle + PI * 0.5)) * 0.25 - glm::vec2(size * cos(angle), size * sin(angle)) * 0.5);

ofVertex(location + glm::vec2(size * 0.5 * cos(angle - PI * 0.5), size * 0.5 * sin(angle - PI * 0.5)) * 0.25 - glm::vec2(size * cos(angle), size * sin(angle)) * 0.5);

ofVertex(location + glm::vec2(size * 0.5 * cos(angle - PI * 0.5), size * 0.5 * sin(angle - PI * 0.5)) * 0.25);

ofEndShape();

ofSetColor(no_fill_color);

ofNoFill();

ofBeginShape();

ofVertex(location + glm::vec2(size * 0.5 * cos(angle + PI * 0.5), size * 0.5 * sin(angle + PI * 0.5)) * 0.25);

ofVertex(location + glm::vec2(size * 0.5 * cos(angle + PI * 0.5), size * 0.5 * sin(angle + PI * 0.5)));

ofVertex(location + glm::vec2(size * cos(angle), size * sin(angle)));

ofVertex(location + glm::vec2(size * 0.5 * cos(angle - PI * 0.5), size * 0.5 * sin(angle - PI * 0.5)));

ofVertex(location + glm::vec2(size * 0.5 * cos(angle - PI * 0.5), size * 0.5 * sin(angle - PI * 0.5)) * 0.25);

ofEndShape();

ofBeginShape();

ofVertex(location + glm::vec2(size * 0.5 * cos(angle - PI * 0.5), size * 0.5 * sin(angle - PI * 0.5)) * 0.25);

ofVertex(location + glm::vec2(size * 0.5 * cos(angle - PI * 0.5), size * 0.5 * sin(angle - PI * 0.5)) * 0.25 - glm::vec2(size * cos(angle), size * sin(angle)) * 0.5);

ofVertex(location + glm::vec2(size * 0.5 * cos(angle + PI * 0.5), size * 0.5 * sin(angle + PI * 0.5)) * 0.25 - glm::vec2(size * cos(angle), size * sin(angle)) * 0.5);

ofVertex(location + glm::vec2(size * 0.5 * cos(angle + PI * 0.5), size * 0.5 * sin(angle + PI * 0.5)) * 0.25);

ofEndShape();

}

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

int main() {

ofSetupOpenGL(720, 720, OF_WINDOW);

ofRunApp(new ofApp());

}

[ Link ]
https://github.com/junkiyoshi/Insta20211124

[ほしいものリスト]
Amazon

[ Sponsor Link ]

2021年11月23日

Colorful waterfall. Draw by openFrameworks

[ Video ]

[ About ]
色をHSBで指定して、HUEをフレーム番号で変化させる。

Specify the color by HSB, and change the HUE by frame number.

[ 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) {};

	vector<glm::vec3> base_location_list;
	vector<ofColor> base_color_list;

	vector<vector<glm::vec2>> log_list;
	vector<ofColor> color_list;
	vector<float> life_list;

	float base_radius;
};

#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) {};

vector<glm::vec3> base_location_list;

vector<ofColor> base_color_list;

vector<vector<glm::vec2>> log_list;

vector<ofColor> color_list;

vector<float> life_list;

float base_radius;

};

#include "ofApp.h"	

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

	ofSetFrameRate(30);
	ofSetWindowTitle("openFrameworks");

	ofBackground(0);
	ofNoFill();
	ofSetLineWidth(1.5);
	ofSetCircleResolution(60);
	ofEnableBlendMode(ofBlendMode::OF_BLENDMODE_ADD);

	this->base_radius = 150;
	for (int deg = 0; deg < 360; deg++) {

		this->base_location_list.push_back(glm::vec3(this->base_radius * cos(deg * DEG_TO_RAD), this->base_radius * sin(deg * DEG_TO_RAD) - 150, 0));
	}
}

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


	int radius = 6;
	ofColor color;
	while (this->log_list.size() < 800) {

		int font_location_index = ofRandom(this->base_location_list.size());
		vector<glm::vec2> log;
		log.push_back(this->base_location_list[font_location_index]);
		this->log_list.push_back(log);

		color.setHsb((ofGetFrameNum() * 2) % 255, 200, 100);
		this->color_list.push_back(color);

		this->life_list.push_back(ofRandom(10, 200));
	}

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

		this->life_list[i] -= 1;
		if (this->life_list[i] < 0) {

			this->log_list.erase(this->log_list.begin() + i);
			this->color_list.erase(this->color_list.begin() + i);
			this->life_list.erase(this->life_list.begin() + i);

			continue;
		}

		auto deg = ofMap(ofNoise(glm::vec3(this->log_list[i].back() * 0.008, ofGetFrameNum() * 0.0015)), 0, 1, 45, 125 + 10);
		this->log_list[i].push_back(this->log_list[i].back() + glm::vec2(radius * cos(deg * DEG_TO_RAD), radius * sin(deg * DEG_TO_RAD)));
		while (this->log_list[i].size() > 100) {

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

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

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

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

		ofSetColor(this->color_list[i], this->life_list[i] > 30 ? 255 : ofMap(this->life_list[i], 0, 30, 0, 255));

		ofBeginShape();
		ofVertices(this->log_list[i]);
		ofEndShape();
	}	

	ofSetColor(255);
	ofDrawCircle(glm::vec3(0, -150, 0), 150);
}

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

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

#include "ofApp.h"

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

void ofApp::setup() {

ofSetFrameRate(30);

ofSetWindowTitle("openFrameworks");

ofBackground(0);

ofNoFill();

ofSetLineWidth(1.5);

ofSetCircleResolution(60);

ofEnableBlendMode(ofBlendMode::OF_BLENDMODE_ADD);

this->base_radius = 150;

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

this->base_location_list.push_back(glm::vec3(this->base_radius * cos(deg * DEG_TO_RAD), this->base_radius * sin(deg * DEG_TO_RAD) - 150, 0));

}

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

void ofApp::update() {

int radius = 6;

ofColor color;

while (this->log_list.size() < 800) {

int font_location_index = ofRandom(this->base_location_list.size());

vector<glm::vec2> log;

log.push_back(this->base_location_list[font_location_index]);

this->log_list.push_back(log);

color.setHsb((ofGetFrameNum() * 2) % 255, 200, 100);

this->color_list.push_back(color);

this->life_list.push_back(ofRandom(10, 200));

}

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

this->life_list[i] -= 1;

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

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

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

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

continue;

}

auto deg = ofMap(ofNoise(glm::vec3(this->log_list[i].back() * 0.008, ofGetFrameNum() * 0.0015)), 0, 1, 45, 125 + 10);

this->log_list[i].push_back(this->log_list[i].back() + glm::vec2(radius * cos(deg * DEG_TO_RAD), radius * sin(deg * DEG_TO_RAD)));

while (this->log_list[i].size() > 100) {

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

}

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

void ofApp::draw() {

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

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

ofSetColor(this->color_list[i], this->life_list[i] > 30 ? 255 : ofMap(this->life_list[i], 0, 30, 0, 255));

ofBeginShape();

ofVertices(this->log_list[i]);

ofEndShape();

}

ofSetColor(255);

ofDrawCircle(glm::vec3(0, -150, 0), 150);

}

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

int main() {

ofSetupOpenGL(720, 720, OF_WINDOW);

ofRunApp(new ofApp());

}

[ Link ]
https://github.com/junkiyoshi/Insta20211123

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