プログラミング de 落描き – ページ 280 – クリエイティブ・コーディングによる生成物とソース

2022年1月9日

Peek at the torsion. Draw by openFrameworks

[ Video ]

[ About ]
トーラスを重ねてトンネルに。

Overlap the torus to make a tunnel.

[ 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(255);
	ofSetColor(255);
	ofSetLineWidth(1.5);
	ofEnableDepthTest();
}

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

	ofSeedRandom(39);
}

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

	this->cam.begin();
	ofRotateX(0);

	int v_span = 1;
	int u_span = 60;

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

	for (int z = -1200; z <= 0; z += 100) {

		auto R = ofMap(z, -1200, 0, 125, 200);

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

			int u_start = ofMap(ofNoise(200 * cos(v * DEG_TO_RAD) * 0.0025, 200 * sin(v * DEG_TO_RAD) * 0.0025, z * 0.005 + ofGetFrameNum() * 0.005), 0, 1, -360, 360);
			int next_u = ofMap(ofNoise(200 * cos((v + v_span) * DEG_TO_RAD) * 0.0025, 200 * sin((v + v_span) * DEG_TO_RAD) * 0.0025, z * 0.005 + ofGetFrameNum() * 0.005), 0, 1, -360, 360);
			for (int u = u_start; u < u_start + 360; u += u_span) {

				face.addVertex(this->make_point(R, 50, u, v) + glm::vec3(0, 0, z));
				face.addVertex(this->make_point(R, 50, u + u_span, v) + glm::vec3(0, 0, z));
				face.addVertex(this->make_point(R, 50, next_u + u_span, v + v_span) + glm::vec3(0, 0, z));
				face.addVertex(this->make_point(R, 50, next_u, v + v_span) + glm::vec3(0, 0, z));

				line.addVertex(this->make_point(R, 50, u, v) + glm::vec3(0, 0, z));
				line.addVertex(this->make_point(R, 50, u + u_span, v) + glm::vec3(0, 0, z));
				line.addVertex(this->make_point(R, 50, next_u + u_span, v + v_span) + glm::vec3(0, 0, z));
				line.addVertex(this->make_point(R, 50, next_u, v + v_span) + glm::vec3(0, 0, z));

				ofColor color = ofColor(255);
				if ((u - u_start) % (u_span * 2) || true) {

					for (int i = 1; i <= 4; i++) {

						//color.setHsb(ofMap(ofNoise(face.getVertex(face.getNumVertices() - i) * 0.003), 0, 1, 128, 255), 200, 255);
						color.setHsb(ofMap(ofNoise(200 * cos(v * DEG_TO_RAD) * 0.0025, 200 * sin(v * DEG_TO_RAD) * 0.0025, z * 0.005 + ofGetFrameNum() * 0.005), 0, 1, 128, 255), 200, 255);
						face.addColor(color);
					}
				}
				else {

					face.addColor(color);
					face.addColor(color);
					face.addColor(color);
					face.addColor(color);
				}

				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;
			}
		}
	}

	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());
}

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#include "ofApp.h"

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

void ofApp::setup() {

ofSetFrameRate(60);

ofSetWindowTitle("openframeworks");

ofBackground(255);

ofSetColor(255);

ofSetLineWidth(1.5);

ofEnableDepthTest();

}

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

void ofApp::update() {

ofSeedRandom(39);

}

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

void ofApp::draw() {

this->cam.begin();

ofRotateX(0);

int v_span = 1;

int u_span = 60;

ofMesh face, line;

line.setMode(ofPrimitiveMode::OF_PRIMITIVE_LINES);

for (int z = -1200; z <= 0; z += 100) {

auto R = ofMap(z, -1200, 0, 125, 200);

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

int u_start = ofMap(ofNoise(200 * cos(v * DEG_TO_RAD) * 0.0025, 200 * sin(v * DEG_TO_RAD) * 0.0025, z * 0.005 + ofGetFrameNum() * 0.005), 0, 1, -360, 360);

int next_u = ofMap(ofNoise(200 * cos((v + v_span) * DEG_TO_RAD) * 0.0025, 200 * sin((v + v_span) * DEG_TO_RAD) * 0.0025, z * 0.005 + ofGetFrameNum() * 0.005), 0, 1, -360, 360);

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

face.addVertex(this->make_point(R, 50, u, v) + glm::vec3(0, 0, z));

face.addVertex(this->make_point(R, 50, u + u_span, v) + glm::vec3(0, 0, z));

face.addVertex(this->make_point(R, 50, next_u + u_span, v + v_span) + glm::vec3(0, 0, z));

face.addVertex(this->make_point(R, 50, next_u, v + v_span) + glm::vec3(0, 0, z));

line.addVertex(this->make_point(R, 50, u, v) + glm::vec3(0, 0, z));

line.addVertex(this->make_point(R, 50, u + u_span, v) + glm::vec3(0, 0, z));

line.addVertex(this->make_point(R, 50, next_u + u_span, v + v_span) + glm::vec3(0, 0, z));

line.addVertex(this->make_point(R, 50, next_u, v + v_span) + glm::vec3(0, 0, z));

ofColor color = ofColor(255);

if ((u - u_start) % (u_span * 2) || true) {

for (int i = 1; i <= 4; i++) {

//color.setHsb(ofMap(ofNoise(face.getVertex(face.getNumVertices() - i) * 0.003), 0, 1, 128, 255), 200, 255);

color.setHsb(ofMap(ofNoise(200 * cos(v * DEG_TO_RAD) * 0.0025, 200 * sin(v * DEG_TO_RAD) * 0.0025, z * 0.005 + ofGetFrameNum() * 0.005), 0, 1, 128, 255), 200, 255);

face.addColor(color);

}

else {

face.addColor(color);

}

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;

}

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/Insta20220109

[ほしいものリスト]
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2022年1月8日

Cube with tiles. Draw by openFrameworks

[ Video ]

[ About ]
タイリングで立方体.

Cubes in Tiling.

[ 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 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) {};

	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 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) {};

ofEasyCam cam;

};

#include "ofApp.h"

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

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

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

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

	ofSeedRandom(39);
}

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

	this->cam.begin();

	ofRotateY(15 * sin(ofGetFrameNum() * 0.05));
	ofRotateX(15 * cos(ofGetFrameNum() * 0.05));

	int span = 60;

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

		if (i < 3) {

			ofRotateY(90);
		}
		else if (i < 4) {

			ofRotateX(90);
		}
		else if (i < 5) {

			ofRotateX(180);
		}

		for (int x = span * -5; x < span * 5; x += span) {

			for (int y = span * -5; y < span * 5; y += span) {

				ofColor color;
				color.setHsb(12, 255, 255);

				ofSetColor(color, 64);
				ofFill();

				int r = ofMap(ofNoise(ofRandom(1000), ofGetFrameNum() * 0.0035), 0, 1, 0, 4);

				auto location = glm::vec3(x, y, span * 4);

				if (r == 1) {

					location += glm::vec3(span, 0, 0);
				}
				else if (r == 2) {

					location += glm::vec3(span, span, 0);
				}
				else if (r == 3) {

					location += glm::vec3(0, span, 0);
				}

				int deg_start = r * 90;
				ofBeginShape();
				ofVertex(location + glm::vec3(span * cos(deg_start * DEG_TO_RAD), span  * sin(deg_start * DEG_TO_RAD), span));
				for (int deg = deg_start; deg <= deg_start + 90; deg += 1) {

					auto radius = span * 0.5;
					ofVertex(location + glm::vec3(radius * cos(deg * DEG_TO_RAD), radius * sin(deg * DEG_TO_RAD), span));
				}
				ofVertex(location + glm::vec3(span  * cos((deg_start + 90) * DEG_TO_RAD), span  * sin((deg_start + 90) * DEG_TO_RAD), span));
				ofEndShape();

				r = (r + 2) % 4;

				location = glm::vec3(x, y, span * 4);
				if (r == 1) {

					location += glm::vec3(span, 0, 0);
				}
				else if (r == 2) {

					location += glm::vec3(span, span, 0);
				}
				else if (r == 3) {

					location += glm::vec3(0, span, 0);
				}

				deg_start = r * 90;
				ofBeginShape();
				ofVertex(location + glm::vec3(span * cos(deg_start * DEG_TO_RAD), span  * sin(deg_start * DEG_TO_RAD), span));
				for (int deg = deg_start; deg <= deg_start + 90; deg += 1) {

					auto radius = span * 0.5;
					ofVertex(location + glm::vec3(radius * cos(deg * DEG_TO_RAD), radius * sin(deg * DEG_TO_RAD), span));
				}
				ofVertex(location + glm::vec3(span  * cos((deg_start + 90) * DEG_TO_RAD), span  * sin((deg_start + 90) * DEG_TO_RAD), span));
				ofEndShape();

				//

				ofSetColor(color);
				ofNoFill();

				r = (r + 2) % 4;

				location = glm::vec3(x, y, span * 4);

				if (r == 1) {

					location += glm::vec3(span, 0, 0);
				}
				else if (r == 2) {

					location += glm::vec3(span, span, 0);
				}
				else if (r == 3) {

					location += glm::vec3(0, span, 0);
				}

				deg_start = r * 90;
				ofBeginShape();
				ofVertex(location + glm::vec3(span * cos(deg_start * DEG_TO_RAD), span  * sin(deg_start * DEG_TO_RAD), span));
				for (int deg = deg_start; deg <= deg_start + 90; deg += 1) {

					auto radius = span * 0.5;
					ofVertex(location + glm::vec3(radius * cos(deg * DEG_TO_RAD), radius * sin(deg * DEG_TO_RAD), span));
				}
				ofVertex(location + glm::vec3(span  * cos((deg_start + 90) * DEG_TO_RAD), span  * sin((deg_start + 90) * DEG_TO_RAD), span));
				ofEndShape();

				r = (r + 2) % 4;

				location = glm::vec3(x, y, span * 4);
				if (r == 1) {

					location += glm::vec3(span, 0, 0);
				}
				else if (r == 2) {

					location += glm::vec3(span, span, 0);
				}
				else if (r == 3) {

					location += glm::vec3(0, span, 0);
				}

				deg_start = r * 90;
				ofBeginShape();
				ofVertex(location + glm::vec3(span * cos(deg_start * DEG_TO_RAD), span  * sin(deg_start * DEG_TO_RAD), span));
				for (int deg = deg_start; deg <= deg_start + 90; deg += 1) {

					auto radius = span * 0.5;
					ofVertex(location + glm::vec3(radius * cos(deg * DEG_TO_RAD), radius * sin(deg * DEG_TO_RAD), span));
				}
				ofVertex(location + glm::vec3(span  * cos((deg_start + 90) * DEG_TO_RAD), span  * sin((deg_start + 90) * DEG_TO_RAD), span));
				ofEndShape();

				ofSetColor(color);
				ofNoFill();
			}
		}
	}

	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();

ofNoFill();

}

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

void ofApp::update() {

ofSeedRandom(39);

}

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

void ofApp::draw() {

this->cam.begin();

ofRotateY(15 * sin(ofGetFrameNum() * 0.05));

ofRotateX(15 * cos(ofGetFrameNum() * 0.05));

int span = 60;

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

if (i < 3) {

ofRotateY(90);

}

else if (i < 4) {

ofRotateX(90);

}

else if (i < 5) {

ofRotateX(180);

}

for (int x = span * -5; x < span * 5; x += span) {

for (int y = span * -5; y < span * 5; y += span) {

ofColor color;

color.setHsb(12, 255, 255);

ofSetColor(color, 64);

ofFill();

int r = ofMap(ofNoise(ofRandom(1000), ofGetFrameNum() * 0.0035), 0, 1, 0, 4);

auto location = glm::vec3(x, y, span * 4);

if (r == 1) {

location += glm::vec3(span, 0, 0);

}

else if (r == 2) {

location += glm::vec3(span, span, 0);

}

else if (r == 3) {

location += glm::vec3(0, span, 0);

}

int deg_start = r * 90;

ofBeginShape();

ofVertex(location + glm::vec3(span * cos(deg_start * DEG_TO_RAD), span * sin(deg_start * DEG_TO_RAD), span));

for (int deg = deg_start; deg <= deg_start + 90; deg += 1) {

auto radius = span * 0.5;

ofVertex(location + glm::vec3(radius * cos(deg * DEG_TO_RAD), radius * sin(deg * DEG_TO_RAD), span));

}

ofVertex(location + glm::vec3(span * cos((deg_start + 90) * DEG_TO_RAD), span * sin((deg_start + 90) * DEG_TO_RAD), span));

ofEndShape();

r = (r + 2) % 4;

location = glm::vec3(x, y, span * 4);

if (r == 1) {

location += glm::vec3(span, 0, 0);

}

else if (r == 2) {

location += glm::vec3(span, span, 0);

}

else if (r == 3) {

location += glm::vec3(0, span, 0);

}

deg_start = r * 90;

ofBeginShape();

ofVertex(location + glm::vec3(span * cos(deg_start * DEG_TO_RAD), span * sin(deg_start * DEG_TO_RAD), span));

for (int deg = deg_start; deg <= deg_start + 90; deg += 1) {

auto radius = span * 0.5;

ofVertex(location + glm::vec3(radius * cos(deg * DEG_TO_RAD), radius * sin(deg * DEG_TO_RAD), span));

}

ofVertex(location + glm::vec3(span * cos((deg_start + 90) * DEG_TO_RAD), span * sin((deg_start + 90) * DEG_TO_RAD), span));

ofEndShape();

ofSetColor(color);

ofNoFill();

r = (r + 2) % 4;

location = glm::vec3(x, y, span * 4);

if (r == 1) {

location += glm::vec3(span, 0, 0);

}

else if (r == 2) {

location += glm::vec3(span, span, 0);

}

else if (r == 3) {

location += glm::vec3(0, span, 0);

}

deg_start = r * 90;

ofBeginShape();

ofVertex(location + glm::vec3(span * cos(deg_start * DEG_TO_RAD), span * sin(deg_start * DEG_TO_RAD), span));

for (int deg = deg_start; deg <= deg_start + 90; deg += 1) {

auto radius = span * 0.5;

ofVertex(location + glm::vec3(radius * cos(deg * DEG_TO_RAD), radius * sin(deg * DEG_TO_RAD), span));

}

ofVertex(location + glm::vec3(span * cos((deg_start + 90) * DEG_TO_RAD), span * sin((deg_start + 90) * DEG_TO_RAD), span));

ofEndShape();

r = (r + 2) % 4;

location = glm::vec3(x, y, span * 4);

if (r == 1) {

location += glm::vec3(span, 0, 0);

}

else if (r == 2) {

location += glm::vec3(span, span, 0);

}

else if (r == 3) {

location += glm::vec3(0, span, 0);

}

deg_start = r * 90;

ofBeginShape();

ofVertex(location + glm::vec3(span * cos(deg_start * DEG_TO_RAD), span * sin(deg_start * DEG_TO_RAD), span));

for (int deg = deg_start; deg <= deg_start + 90; deg += 1) {

auto radius = span * 0.5;

ofVertex(location + glm::vec3(radius * cos(deg * DEG_TO_RAD), radius * sin(deg * DEG_TO_RAD), span));

}

ofVertex(location + glm::vec3(span * cos((deg_start + 90) * DEG_TO_RAD), span * sin((deg_start + 90) * DEG_TO_RAD), span));

ofEndShape();

ofSetColor(color);

ofNoFill();

}

this->cam.end();

}

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

int main() {

ofSetupOpenGL(720, 720, OF_WINDOW);

ofRunApp(new ofApp());

}

[ Link ]
https://github.com/junkiyoshi/Insta20220108

[ほしいものリスト]
Amazon

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2022年1月7日

Switching half circle. Draw by openFrameworks

[ Video ]

[ About ]
半円をスイッチしていく。

Switch the half circle.

[ 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 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) {};
};

#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 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) {};

};

#include "ofApp.h"

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

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

	ofBackground(255);
	ofSetColor(0);
	ofSetLineWidth(2);
}

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

	ofSeedRandom(39);
}

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

	ofTranslate(ofGetWindowSize() * 0.5);

	int span = 60;
	for (int x = span * -5; x < span * 5; x += span) {

		for (int y = span  * -5; y < span * 5; y += span) {

			int r = ofMap(ofNoise(ofRandom(1000), ofGetFrameNum() * 0.0035), 0, 1, 0, 4);
			auto location = glm::vec2(x, y);

			if (r == 1) {

				location += glm::vec2(span, 0);
			}
			else if (r == 2) {

				location += glm::vec2(span, span);
			}
			else if (r == 3) {

				location += glm::vec2(0, span);
			}

			int deg_start = r * 90;
			ofBeginShape();
			for (int deg = deg_start; deg <= deg_start + 90; deg += 1) {

				auto radius = span * 0.5;
				ofVertex(location + glm::vec2(radius * cos(deg * DEG_TO_RAD), radius * sin(deg * DEG_TO_RAD)));
			}
			ofVertex(location);
			ofEndShape(true);

			r = (r + 2) % 4;

			location = glm::vec2(x, y);
			if (r == 1) {

				location += glm::vec2(span, 0);
			}
			else if (r == 2) {

				location += glm::vec2(span, span);
			}
			else if (r == 3) {

				location += glm::vec2(0, span);
			}

			deg_start = r * 90;
			ofBeginShape();
			for (int deg = deg_start; deg <= deg_start + 90; deg += 1) {

				auto radius = span * 0.5;
				ofVertex(location + glm::vec2(radius * cos(deg * DEG_TO_RAD), radius * sin(deg * DEG_TO_RAD)));
			}
			ofVertex(location);
			ofEndShape(true);
		}
	}
}

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

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

#include "ofApp.h"

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

void ofApp::setup() {

ofSetFrameRate(30);

ofSetWindowTitle("openframeworks");

ofBackground(255);

ofSetColor(0);

ofSetLineWidth(2);

}

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

void ofApp::update() {

ofSeedRandom(39);

}

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

void ofApp::draw() {

ofTranslate(ofGetWindowSize() * 0.5);

int span = 60;

for (int x = span * -5; x < span * 5; x += span) {

for (int y = span * -5; y < span * 5; y += span) {

int r = ofMap(ofNoise(ofRandom(1000), ofGetFrameNum() * 0.0035), 0, 1, 0, 4);

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

if (r == 1) {

location += glm::vec2(span, 0);

}

else if (r == 2) {

location += glm::vec2(span, span);

}

else if (r == 3) {

location += glm::vec2(0, span);

}

int deg_start = r * 90;

ofBeginShape();

for (int deg = deg_start; deg <= deg_start + 90; deg += 1) {

auto radius = span * 0.5;

ofVertex(location + glm::vec2(radius * cos(deg * DEG_TO_RAD), radius * sin(deg * DEG_TO_RAD)));

}

ofVertex(location);

ofEndShape(true);

r = (r + 2) % 4;

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

if (r == 1) {

location += glm::vec2(span, 0);

}

else if (r == 2) {

location += glm::vec2(span, span);

}

else if (r == 3) {

location += glm::vec2(0, span);

}

deg_start = r * 90;

ofBeginShape();

for (int deg = deg_start; deg <= deg_start + 90; deg += 1) {

auto radius = span * 0.5;

ofVertex(location + glm::vec2(radius * cos(deg * DEG_TO_RAD), radius * sin(deg * DEG_TO_RAD)));

}

ofVertex(location);

ofEndShape(true);

}

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

int main() {

ofSetupOpenGL(720, 720, OF_WINDOW);

ofRunApp(new ofApp());

}

[ Link ]
https://github.com/junkiyoshi/Insta20220107

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