2021年9月 – ページ 3 – プログラミング de 落描き

2021年9月24日2021年9月24日

Colorful torus. Draw by openFrameworks

[ Video ]

[ About ]
ループ内でofSeedRandom()を呼び出して同じランダム値を得る。

Call ofSeedRandom() in the loop to get the same random value.

[ 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) {};

	glm::vec3 make_point(float R, float r, float u, float v);

	ofEasyCam cam;
};

#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) {};

glm::vec3 make_point(float R, float r, float u, float v);

ofEasyCam cam;

};

#include "ofApp.h"

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

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

	ofBackground(239);
	ofSetLineWidth(2);
	ofEnableDepthTest();
}

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

	ofSeedRandom(39);
}

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

	this->cam.begin();

	int v_span = 1;
	int u_span = 30;

	ofMesh face, line;
	ofColor color;
	line.setMode(ofPrimitiveMode::OF_PRIMITIVE_LINES);
	for (int v = 0; v <= 360; v += v_span) {

		bool flag = true;
		int u_start = v;
		int next_u = u_start + v_span;

		ofSeedRandom(39);
		for (int u = u_start; u < u_start + 360; u += u_span) {

			auto noise_param = ofRandom(1000);

			if (flag) {

				face.addVertex(this->make_point(230, 60, u, v));
				face.addVertex(this->make_point(230, 60, u + u_span, v));
				face.addVertex(this->make_point(230, 60, next_u + u_span, v + v_span));
				face.addVertex(this->make_point(230, 60, next_u, v + v_span));

				line.addVertex(this->make_point(230, 60, u, v));
				line.addVertex(this->make_point(230, 60, u + u_span, v));
				line.addVertex(this->make_point(230, 60, next_u + u_span, v + v_span));
				line.addVertex(this->make_point(230, 60, next_u, v + v_span));

				for (int i = 0; i < 4; i++) {

					color.setHsb((int)ofMap(ofNoise(glm::vec4(face.getVertex(face.getNumVertices() - 4 + i) * 0.0005, noise_param + ofGetFrameNum() * 0.003)), 0, 1, 0, 255 * 6) % 255, 130, 255);
					face.addColor(color);
					line.addColor(ofColor(239));
				}

				face.addIndex(face.getNumVertices() - 1); face.addIndex(face.getNumVertices() - 2); face.addIndex(face.getNumVertices() - 3);
				face.addIndex(face.getNumVertices() - 1); face.addIndex(face.getNumVertices() - 3); face.addIndex(face.getNumVertices() - 4);

				line.addIndex(line.getNumVertices() - 1); line.addIndex(line.getNumVertices() - 4);
				line.addIndex(line.getNumVertices() - 2); line.addIndex(line.getNumVertices() - 3);
			}

			next_u += u_span;
		    flag = !flag;
		}
	}

	face.drawFaces();
	line.drawWireframe();

	this->cam.end();
}

//--------------------------------------------------------------
glm::vec3 ofApp::make_point(float R, float r, float u, float v) {

	// 数学デッサン教室 描いて楽しむ数学たち　P.31

	u *= DEG_TO_RAD;
	v *= DEG_TO_RAD;

	auto x = (R + r * cos(u)) * cos(v);
	auto y = (R + r * cos(u)) * sin(v);
	auto z = r * sin(u);

	return glm::vec3(x, y, z);
}

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

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

#include "ofApp.h"

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

void ofApp::setup() {

ofSetFrameRate(60);

ofSetWindowTitle("openframeworks");

ofBackground(239);

ofSetLineWidth(2);

ofEnableDepthTest();

}

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

void ofApp::update() {

ofSeedRandom(39);

}

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

void ofApp::draw() {

this->cam.begin();

int v_span = 1;

int u_span = 30;

ofMesh face, line;

ofColor color;

line.setMode(ofPrimitiveMode::OF_PRIMITIVE_LINES);

for (int v = 0; v <= 360; v += v_span) {

bool flag = true;

int u_start = v;

int next_u = u_start + v_span;

ofSeedRandom(39);

for (int u = u_start; u < u_start + 360; u += u_span) {

auto noise_param = ofRandom(1000);

if (flag) {

face.addVertex(this->make_point(230, 60, u, v));

face.addVertex(this->make_point(230, 60, u + u_span, v));

face.addVertex(this->make_point(230, 60, next_u + u_span, v + v_span));

face.addVertex(this->make_point(230, 60, next_u, v + v_span));

line.addVertex(this->make_point(230, 60, u, v));

line.addVertex(this->make_point(230, 60, u + u_span, v));

line.addVertex(this->make_point(230, 60, next_u + u_span, v + v_span));

line.addVertex(this->make_point(230, 60, next_u, v + v_span));

for (int i = 0; i < 4; i++) {

color.setHsb((int)ofMap(ofNoise(glm::vec4(face.getVertex(face.getNumVertices() - 4 + i) * 0.0005, noise_param + ofGetFrameNum() * 0.003)), 0, 1, 0, 255 * 6) % 255, 130, 255);

face.addColor(color);

line.addColor(ofColor(239));

}

face.addIndex(face.getNumVertices() - 1); face.addIndex(face.getNumVertices() - 2); face.addIndex(face.getNumVertices() - 3);

face.addIndex(face.getNumVertices() - 1); face.addIndex(face.getNumVertices() - 3); face.addIndex(face.getNumVertices() - 4);

line.addIndex(line.getNumVertices() - 1); line.addIndex(line.getNumVertices() - 4);

line.addIndex(line.getNumVertices() - 2); line.addIndex(line.getNumVertices() - 3);

}

next_u += u_span;

flag = !flag;

}

face.drawFaces();

line.drawWireframe();

this->cam.end();

}

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

glm::vec3 ofApp::make_point(float R, float r, float u, float v) {

// 数学デッサン教室描いて楽しむ数学たち　P.31

u *= DEG_TO_RAD;

v *= DEG_TO_RAD;

auto x = (R + r * cos(u)) * cos(v);

auto y = (R + r * cos(u)) * sin(v);

auto z = r * sin(u);

return glm::vec3(x, y, z);

}

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

int main() {

ofSetupOpenGL(720, 720, OF_WINDOW);

ofRunApp(new ofApp());

}

[ Link ]
https://github.com/junkiyoshi/Insta20210924

[ほしいものリスト]
Amazon

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2021年9月23日2021年9月24日

Random hexagon walker with shadow. Draw by openFrameworks

[ Video ]

[ About ]
OpenCVのぼかしで影を作って浮いている感じにする。

Use OpenCV’s blur to create shadows to make it look like it’s floating.

[ 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 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) {};

	float radius;
	vector<vector<glm::vec2>> hexagon_list;
	vector<ofColor> base_color_list;

	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 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) {};

float radius;

vector<vector<glm::vec2>> hexagon_list;

vector<ofColor> base_color_list;

ofFbo fbo;

ofPixels pixels;

cv::Mat pixels_mat;

};

#include "ofApp.h"

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

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

	ofBackground(239);

	this->radius = 15;
	vector<glm::vec2> start_location_list;
	auto x_span = this->radius * sqrt(3);
	auto flg = true;
	auto edge = 120;
	for (float y = edge; y < ofGetHeight() + this->radius - edge; y += this->radius * 1.5) {

		for (float x = edge; x < ofGetWidth() + this->radius - edge; x += x_span) {

			glm::vec2 location;
			if (flg) {

				location = glm::vec2(x, y);
			}
			else {

				location = glm::vec2(x + (this->radius * sqrt(3) / 2), y);
			}

			start_location_list.push_back(location);
		}
		flg = !flg;
	}

	for (int i = 0; i < 10; i++) {

		int r = ofRandom(start_location_list.size());

		auto log_list = vector<glm::vec2>();
		log_list.push_back(start_location_list[r]);
		this->hexagon_list.push_back(log_list);
	}

	ofColor color;
	vector<int> hex_list = { 0xee6352, 0x59cd90, 0x3fa7d6, 0xfac05e, 0xf79d84 };
	for (auto hex : hex_list) {

		color.setHex(hex);
		this->base_color_list.push_back(color);
	}

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

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

	auto span = this->radius * sqrt(3);
	auto edge = 120;
	for (auto& log_list : this->hexagon_list) {

		int r = ofRandom(6);
		int deg_start = r * 60;
		for (int deg = deg_start; deg < deg_start + 360; deg += 60) {

			auto tmp_location = log_list.back() + glm::vec2(span * cos(deg * DEG_TO_RAD), span * sin(deg * DEG_TO_RAD));
			if (tmp_location.x < edge || tmp_location.x > ofGetWidth() + this->radius - edge || tmp_location.y < edge || tmp_location.y > ofGetHeight() + this->radius - edge) {

				continue;
			}

			log_list.push_back(tmp_location);
			break;
		}

		while (log_list.size() > 10) {

			log_list.erase(log_list.begin());
		}
	}

	this->fbo.begin();
	ofClear(0);
	ofEnableBlendMode(ofBlendMode::OF_BLENDMODE_ADD);

	int color_index = 0;
	for (auto& log_list : this->hexagon_list) {

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

			vector<glm::vec2> vertices;
			for (auto deg = 90; deg < 450; deg += 60) {

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

			ofFill();
			ofSetColor(this->base_color_list[color_index % this->base_color_list.size()]);
			ofBeginShape();
			ofVertices(vertices);
			ofEndShape(true);

			ofNoFill();
			ofSetColor(255);
			ofBeginShape();
			ofVertices(vertices);
			ofEndShape(true);
		}

		color_index++;
	}

	ofDisableBlendMode();

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

	cv::Mat gray_mat, bit_mat;
	cv::cvtColor(this->pixels_mat, gray_mat, cv::COLOR_RGB2GRAY);
	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(139, 139, 139, 255);
			}
		}
	}

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

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

	ofSetColor(255);

	ofImage draw_image;
	draw_image.setFromPixels(this->pixels);
	draw_image.draw(0, 0);

	this->fbo.draw(-15, -15);
}

//--------------------------------------------------------------
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(239);

this->radius = 15;

vector<glm::vec2> start_location_list;

auto x_span = this->radius * sqrt(3);

auto flg = true;

auto edge = 120;

for (float y = edge; y < ofGetHeight() + this->radius - edge; y += this->radius * 1.5) {

for (float x = edge; x < ofGetWidth() + this->radius - edge; x += x_span) {

glm::vec2 location;

if (flg) {

location = glm::vec2(x, y);

}

else {

location = glm::vec2(x + (this->radius * sqrt(3) / 2), y);

}

start_location_list.push_back(location);

}

flg = !flg;

}

for (int i = 0; i < 10; i++) {

int r = ofRandom(start_location_list.size());

auto log_list = vector<glm::vec2>();

log_list.push_back(start_location_list[r]);

this->hexagon_list.push_back(log_list);

}

ofColor color;

vector<int> hex_list = { 0xee6352, 0x59cd90, 0x3fa7d6, 0xfac05e, 0xf79d84 };

for (auto hex : hex_list) {

color.setHex(hex);

this->base_color_list.push_back(color);

}

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

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

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

}

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

void ofApp::update() {

auto span = this->radius * sqrt(3);

auto edge = 120;

for (auto& log_list : this->hexagon_list) {

int r = ofRandom(6);

int deg_start = r * 60;

for (int deg = deg_start; deg < deg_start + 360; deg += 60) {

auto tmp_location = log_list.back() + glm::vec2(span * cos(deg * DEG_TO_RAD), span * sin(deg * DEG_TO_RAD));

if (tmp_location.x < edge || tmp_location.x > ofGetWidth() + this->radius - edge || tmp_location.y < edge || tmp_location.y > ofGetHeight() + this->radius - edge) {

continue;

}

log_list.push_back(tmp_location);

break;

}

while (log_list.size() > 10) {

log_list.erase(log_list.begin());

}

this->fbo.begin();

ofClear(0);

ofEnableBlendMode(ofBlendMode::OF_BLENDMODE_ADD);

int color_index = 0;

for (auto& log_list : this->hexagon_list) {

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

vector<glm::vec2> vertices;

for (auto deg = 90; deg < 450; deg += 60) {

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

}

ofFill();

ofSetColor(this->base_color_list[color_index % this->base_color_list.size()]);

ofBeginShape();

ofVertices(vertices);

ofEndShape(true);

ofNoFill();

ofSetColor(255);

ofBeginShape();

ofVertices(vertices);

ofEndShape(true);

}

color_index++;

}

ofDisableBlendMode();

this->fbo.end();

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

cv::Mat gray_mat, bit_mat;

cv::cvtColor(this->pixels_mat, gray_mat, cv::COLOR_RGB2GRAY);

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(139, 139, 139, 255);

}

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

}

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

void ofApp::draw() {

ofSetColor(255);

ofImage draw_image;

draw_image.setFromPixels(this->pixels);

draw_image.draw(0, 0);

this->fbo.draw(-15, -15);

}

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

int main() {

ofSetupOpenGL(720, 720, OF_WINDOW);

ofRunApp(new ofApp());

}

[ Link ]
https://github.com/junkiyoshi/Insta20210923

[ほしいものリスト]
Amazon

[ Sponsor Link ]

2021年9月22日

Neon circles. Draw by openFrameworks

[ Video ]

[ About ]
OpenCVで描画をぼかしてネオン風にする。

Blurring a draw with OpenCV to make it look neon.

[ 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(30);
	ofSetWindowTitle("openframeworks");

	ofBackground(0);
	ofSetLineWidth(3);
	ofEnableBlendMode(ofBlendMode::OF_BLENDMODE_ADD);

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

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

	ofSeedRandom(914);

	this->fbo.begin();
	ofClear(0);
	ofFill();
	ofTranslate(this->fbo.getWidth() * 0.5, this->fbo.getHeight() * 0.5);

	ofColor color;
	for (int i = 0; i < 14; i++) {

		auto len = 23;
		auto radius = (i + 1) * 20;
		auto deg_start = 0;
		auto deg_param = ofMap(ofNoise(ofRandom(1000), ofGetFrameNum() * 0.008), 0, 1, 90, 360 + 120);
		if (deg_param > 360) { deg_param = 360; }
		auto deg_end = deg_start + deg_param;
		vector<glm::vec2> vertices_1, vertices_2;
		for (int deg = deg_start - 5; deg <= deg_end + 5; deg++) {

			vertices_1.push_back(glm::vec2((radius - len * 0.5) * cos(deg * DEG_TO_RAD), (radius - len * 0.5) * sin(deg * DEG_TO_RAD)));
			vertices_2.push_back(glm::vec2((radius + len * 0.5) * cos(deg * DEG_TO_RAD), (radius + len * 0.5) * sin(deg * DEG_TO_RAD)));
		}
		reverse(vertices_2.begin(), vertices_2.end());

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

		ofBeginShape();
		ofVertices(vertices_1);
		ofVertices(vertices_2);
		ofEndShape(true);
	}

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

	cv::GaussianBlur(this->pixels_mat, this->pixels_mat, cv::Size(49, 49), 50, 50);
}

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

	ofSeedRandom(914);

	ofFill();
	ofSetColor(255);
	ofImage draw_image;
	draw_image.setFromPixels(this->pixels);
	draw_image.draw(0, 0);

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

	ofColor color;
	for (int i = 0; i < 14; i++) {

		auto len = 8;
		auto radius = (i + 1) * 20;
		auto deg_start = 0;
		auto deg_param = ofMap(ofNoise(ofRandom(1000), ofGetFrameNum() * 0.008), 0, 1, 90, 360 + 120);
		if (deg_param > 360) { deg_param = 360; }
		auto deg_end = deg_start + deg_param;
		vector<glm::vec2> vertices_1, vertices_2;
		for (int deg = deg_start; deg <= deg_end; deg++) {

			vertices_1.push_back(glm::vec2((radius - len * 0.5) * cos(deg * DEG_TO_RAD), (radius - len * 0.5) * sin(deg * DEG_TO_RAD)));
			vertices_2.push_back(glm::vec2((radius + len * 0.5) * cos(deg * DEG_TO_RAD), (radius + len * 0.5) * sin(deg * DEG_TO_RAD)));
		}
		reverse(vertices_2.begin(), vertices_2.end());

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

		ofFill();
		ofSetColor(ofColor(255));
		ofBeginShape();
		ofVertices(vertices_1);
		ofVertices(vertices_2);
		ofEndShape(true);

		ofNoFill();
		ofSetColor(color);
		ofBeginShape();
		ofVertices(vertices_1);
		ofVertices(vertices_2);
		ofEndShape(true);
	}
}

//--------------------------------------------------------------
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(3);

ofEnableBlendMode(ofBlendMode::OF_BLENDMODE_ADD);

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

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

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

}

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

void ofApp::update() {

ofSeedRandom(914);

this->fbo.begin();

ofClear(0);

ofFill();

ofTranslate(this->fbo.getWidth() * 0.5, this->fbo.getHeight() * 0.5);

ofColor color;

for (int i = 0; i < 14; i++) {

auto len = 23;

auto radius = (i + 1) * 20;

auto deg_start = 0;

auto deg_param = ofMap(ofNoise(ofRandom(1000), ofGetFrameNum() * 0.008), 0, 1, 90, 360 + 120);

if (deg_param > 360) { deg_param = 360; }

auto deg_end = deg_start + deg_param;

vector<glm::vec2> vertices_1, vertices_2;

for (int deg = deg_start - 5; deg <= deg_end + 5; deg++) {

vertices_1.push_back(glm::vec2((radius - len * 0.5) * cos(deg * DEG_TO_RAD), (radius - len * 0.5) * sin(deg * DEG_TO_RAD)));

vertices_2.push_back(glm::vec2((radius + len * 0.5) * cos(deg * DEG_TO_RAD), (radius + len * 0.5) * sin(deg * DEG_TO_RAD)));

}

reverse(vertices_2.begin(), vertices_2.end());

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

ofSetColor(color);

ofBeginShape();

ofVertices(vertices_1);

ofVertices(vertices_2);

ofEndShape(true);

}

this->fbo.end();

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

cv::GaussianBlur(this->pixels_mat, this->pixels_mat, cv::Size(49, 49), 50, 50);

}

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

void ofApp::draw() {

ofSeedRandom(914);

ofFill();

ofSetColor(255);

ofImage draw_image;

draw_image.setFromPixels(this->pixels);

draw_image.draw(0, 0);

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

ofColor color;

for (int i = 0; i < 14; i++) {

auto len = 8;

auto radius = (i + 1) * 20;

auto deg_start = 0;

auto deg_param = ofMap(ofNoise(ofRandom(1000), ofGetFrameNum() * 0.008), 0, 1, 90, 360 + 120);

if (deg_param > 360) { deg_param = 360; }

auto deg_end = deg_start + deg_param;

vector<glm::vec2> vertices_1, vertices_2;

for (int deg = deg_start; deg <= deg_end; deg++) {

vertices_1.push_back(glm::vec2((radius - len * 0.5) * cos(deg * DEG_TO_RAD), (radius - len * 0.5) * sin(deg * DEG_TO_RAD)));

vertices_2.push_back(glm::vec2((radius + len * 0.5) * cos(deg * DEG_TO_RAD), (radius + len * 0.5) * sin(deg * DEG_TO_RAD)));

}

reverse(vertices_2.begin(), vertices_2.end());

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

ofFill();

ofSetColor(ofColor(255));

ofBeginShape();

ofVertices(vertices_1);

ofVertices(vertices_2);

ofEndShape(true);

ofNoFill();

ofSetColor(color);

ofBeginShape();

ofVertices(vertices_1);

ofVertices(vertices_2);

ofEndShape(true);

}

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

int main() {

ofSetupOpenGL(720, 720, OF_WINDOW);

ofRunApp(new ofApp());

}

[ Link ]
https://github.com/junkiyoshi/Insta20210922

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