programming – ページ 75 – プログラミング de 落描き

2023年2月4日

Radial line. Draw by openFrameworks

[ Video ]

[ About ]
放射状の線。

[ 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) {};

	ofMesh mesh;

	glm::vec2 base_seed;

	vector<vector<glm::vec2>> log_list;
	vector<glm::vec2> velocity_list;
	vector<ofColor> color_list;
};

#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) {};

ofMesh mesh;

glm::vec2 base_seed;

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

vector<glm::vec2> velocity_list;

vector<ofColor> color_list;

};

#include "ofApp.h"

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

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

	ofBackground(0);
	ofSetCircleResolution(60);
	ofEnableBlendMode(ofBlendMode::OF_BLENDMODE_ADD);

	this->mesh.setMode(ofPrimitiveMode::OF_PRIMITIVE_LINES);
	this->base_seed = glm::vec2(ofRandom(1000), ofRandom(1000));
}

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

	this->mesh.clear();

	int span = 20;
	int radius = 90;
	ofColor color;

	while (this->log_list.size() < 2000) {
	
		int deg_base = ofRandom(360);
		int deg = deg_base / 24 * 24;

		vector<glm::vec2> log;
		auto location = glm::vec2(radius * cos(deg * DEG_TO_RAD), radius * sin(deg * DEG_TO_RAD));
		log.push_back(location);
		auto next = glm::vec2((radius - 10) * cos(deg * DEG_TO_RAD), (radius - 10) * sin(deg * DEG_TO_RAD));

		auto distance = location - next;
		distance *= 2;

		auto future = location + distance * 30;
		auto random_deg = ofRandom(360);
		future += glm::vec2(120 * cos(random_deg * DEG_TO_RAD), 120 * sin(random_deg * DEG_TO_RAD));
		auto future_distance = future - location;

		this->log_list.push_back(log);
		this->velocity_list.push_back(glm::normalize(future_distance) * glm::length(distance) * ofRandom(0.25, 0.6));
		color.setHsb(ofMap(deg_base, 0, 360, 0, 255), 255, 255);
		this->color_list.push_back(ofColor(color, 64));
	}

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

		auto location = this->log_list[i][this->log_list[i].size() - 1];
		location += this->velocity_list[i];
		
		if (glm::distance(glm::vec2(), this->log_list[i][this->log_list[i].size() - 1])> 1300) {

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

			continue;
		}

		this->log_list[i].push_back(location);
		this->velocity_list[i] *= 1.01;
	}

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

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

			this->mesh.addVertex(glm::vec3(this->log_list[i][k], 0));
			this->mesh.addColor(this->color_list[i]);

			if (k > 0) {

				this->mesh.addIndex(this->mesh.getNumVertices() - 1); this->mesh.addIndex(this->mesh.getNumVertices() - 2);
			}
		}
	}

	/*
	for (int i = 0; i < this->mesh.getNumVertices(); i++) {

		for (int k = i + 1; k < this->mesh.getNumVertices(); k++) {

			auto distance = glm::distance(this->mesh.getVertex(i), this->mesh.getVertex(k));
			if (distance < span) {

				auto alpha = distance < span * 0.25 ? 255 : ofMap(distance, span * 0.25, span, 255, 0);

				if (this->mesh.getColor(i).a < alpha) {

					this->mesh.setColor(i, ofColor(this->mesh.getColor(i), alpha));
				}

				if (this->mesh.getColor(k).a < alpha) {

					this->mesh.setColor(k, ofColor(this->mesh.getColor(k), alpha));
				}

				this->mesh.addIndex(i);
				this->mesh.addIndex(k);
			}
		}
	}
	*/
}

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

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

	this->mesh.drawWireframe();

	ofFill();
	for (int i = 0; i < this->mesh.getNumVertices(); i++) {

		ofSetColor(this->mesh.getColor(i));
		//ofDrawCircle(this->mesh.getVertex(i), 3);
	}
}

//--------------------------------------------------------------
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);

ofSetCircleResolution(60);

ofEnableBlendMode(ofBlendMode::OF_BLENDMODE_ADD);

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

this->base_seed = glm::vec2(ofRandom(1000), ofRandom(1000));

}

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

void ofApp::update() {

this->mesh.clear();

int span = 20;

int radius = 90;

ofColor color;

while (this->log_list.size() < 2000) {

int deg_base = ofRandom(360);

int deg = deg_base / 24 * 24;

vector<glm::vec2> log;

auto location = glm::vec2(radius * cos(deg * DEG_TO_RAD), radius * sin(deg * DEG_TO_RAD));

log.push_back(location);

auto next = glm::vec2((radius - 10) * cos(deg * DEG_TO_RAD), (radius - 10) * sin(deg * DEG_TO_RAD));

auto distance = location - next;

distance *= 2;

auto future = location + distance * 30;

auto random_deg = ofRandom(360);

future += glm::vec2(120 * cos(random_deg * DEG_TO_RAD), 120 * sin(random_deg * DEG_TO_RAD));

auto future_distance = future - location;

this->log_list.push_back(log);

this->velocity_list.push_back(glm::normalize(future_distance) * glm::length(distance) * ofRandom(0.25, 0.6));

color.setHsb(ofMap(deg_base, 0, 360, 0, 255), 255, 255);

this->color_list.push_back(ofColor(color, 64));

}

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

auto location = this->log_list[i][this->log_list[i].size() - 1];

location += this->velocity_list[i];

if (glm::distance(glm::vec2(), this->log_list[i][this->log_list[i].size() - 1])> 1300) {

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

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

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

continue;

}

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

this->velocity_list[i] *= 1.01;

}

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

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

this->mesh.addVertex(glm::vec3(this->log_list[i][k], 0));

this->mesh.addColor(this->color_list[i]);

if (k > 0) {

this->mesh.addIndex(this->mesh.getNumVertices() - 1); this->mesh.addIndex(this->mesh.getNumVertices() - 2);

}

for (int i = 0; i < this->mesh.getNumVertices(); i++) {

for (int k = i + 1; k < this->mesh.getNumVertices(); k++) {

auto distance = glm::distance(this->mesh.getVertex(i), this->mesh.getVertex(k));

if (distance < span) {

auto alpha = distance < span * 0.25 ? 255 : ofMap(distance, span * 0.25, span, 255, 0);

if (this->mesh.getColor(i).a < alpha) {

this->mesh.setColor(i, ofColor(this->mesh.getColor(i), alpha));

}

if (this->mesh.getColor(k).a < alpha) {

this->mesh.setColor(k, ofColor(this->mesh.getColor(k), alpha));

}

this->mesh.addIndex(i);

this->mesh.addIndex(k);

}

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

void ofApp::draw() {

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

this->mesh.drawWireframe();

ofFill();

for (int i = 0; i < this->mesh.getNumVertices(); i++) {

ofSetColor(this->mesh.getColor(i));

//ofDrawCircle(this->mesh.getVertex(i), 3);

}

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

int main() {

ofSetupOpenGL(720, 720, OF_WINDOW);

ofRunApp(new ofApp());

}

[ Link ]
https://github.com/junkiyoshi/Insta20230204

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2023年2月3日

Fixed distance. Draw by openFrameworks

[ Video ]

[ About ]
一定距離離れる。

[ 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;

	vector<glm::vec2> location_list;
	vector<ofColor> color_list;
	vector<int> index_list;

	ofTrueTypeFont font;
	string word;
};

#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;

vector<glm::vec2> location_list;

vector<ofColor> color_list;

vector<int> index_list;

ofTrueTypeFont font;

string word;

};

#include "ofApp.h"	

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

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

	ofBackground(255);
	ofSetLineWidth(2);
	//ofEnableBlendMode(ofBlendMode::OF_BLENDMODE_ADD);

	this->font.loadFont("fonts/Kazesawa-Bold.ttf", 15, true, true, true);
	this->word = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";

	vector<glm::vec2> location_list;
	ofColor color;
	for (int x = -400 - 15; x <= 400 - 15; x += 15) {

		for (int y = -400 + 15; y <= 400 + 15; y += 20) {

			this->location_list.push_back(glm::vec2(x + 10, y - 10));
			color.setHsb(ofRandom(255), 255, 255);
			this->color_list.push_back(color);
			this->index_list.push_back(ofRandom(this->word.size()));
		}
	}
}

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

	ofSeedRandom(39);
}

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

	this->cam.begin();
	ofRotateX(120);

	auto noise_location = glm::vec3(ofMap(ofNoise(ofRandom(1000), ofGetFrameNum() * 0.01), 0, 1, -200, 200), ofMap(ofNoise(ofRandom(1000), ofGetFrameNum() * 0.01), 0, 1, -200, 200), 30);
	ofSetColor(0);
	ofDrawSphere(noise_location - glm::vec3(0, 0, 30), 10);
	ofColor color;
	for (int i = 0; i < this->location_list.size(); i++) {

		auto distance = glm::distance(noise_location, glm::vec3(this->location_list[i], 0));
		auto deg = glm::vec3();
		auto noise_seed = glm::vec3(ofRandom(1000), ofRandom(1000), ofRandom(1000));
		if (distance < 150) {

			auto gap = glm::vec3(this->location_list[i], 0) - noise_location;
			auto location = noise_location + glm::normalize(gap) * 150;

			deg.x = ofMap(ofNoise(noise_seed.x, ofGetFrameNum() * 0.02), 0, 1, -180, 180);
			deg.y = ofMap(ofNoise(noise_seed.y, ofGetFrameNum() * 0.02), 0, 1, -180, 180);
			deg.z = ofMap(ofNoise(noise_seed.z, ofGetFrameNum() * 0.02), 0, 1, -180, 180);

			ofPushMatrix();
			ofTranslate(location);
			ofRotateZ(deg.z);
			ofRotateY(deg.y);
			ofRotateX(deg.x);

			this->index_list[i] = (this->index_list[i] + 1) % this->word.size();

		}
		else {

			ofPushMatrix();
			ofTranslate(this->location_list[i]);
			ofRotateZ(deg.z);
			ofRotateY(deg.y);
			ofRotateX(deg.x);

		}

		ofPath chara_path = this->font.getCharacterAsPoints(this->word[this->index_list[i]], true, false);
		vector<ofPolyline> outline = chara_path.getOutline();


		ofFill();
		ofSetColor(this->color_list[i], 128);
		ofBeginShape();
		for (int outline_index = 0; outline_index < outline.size(); outline_index++) {

			ofNextContour(true);

			auto vertices = outline[outline_index].getVertices();
			for (auto& vertex : vertices) {

				ofVertex(vertex + glm::vec2(-6, 8));
			}
		}
		ofEndShape(true);

		ofNoFill();
		ofSetColor(this->color_list[i]);
		ofBeginShape();
		for (int outline_index = 0; outline_index < outline.size(); outline_index++) {

			ofNextContour(true);

			auto vertices = outline[outline_index].getVertices();
			for (auto& vertex : vertices) {

				ofVertex(vertex + glm::vec2(-6, 8));
			}
		}
		ofEndShape(true);

		ofPopMatrix();
	}

	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(255);

ofSetLineWidth(2);

//ofEnableBlendMode(ofBlendMode::OF_BLENDMODE_ADD);

this->font.loadFont("fonts/Kazesawa-Bold.ttf", 15, true, true, true);

this->word = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";

vector<glm::vec2> location_list;

ofColor color;

for (int x = -400 - 15; x <= 400 - 15; x += 15) {

for (int y = -400 + 15; y <= 400 + 15; y += 20) {

this->location_list.push_back(glm::vec2(x + 10, y - 10));

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

this->color_list.push_back(color);

this->index_list.push_back(ofRandom(this->word.size()));

}

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

void ofApp::update() {

ofSeedRandom(39);

}

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

void ofApp::draw() {

this->cam.begin();

ofRotateX(120);

auto noise_location = glm::vec3(ofMap(ofNoise(ofRandom(1000), ofGetFrameNum() * 0.01), 0, 1, -200, 200), ofMap(ofNoise(ofRandom(1000), ofGetFrameNum() * 0.01), 0, 1, -200, 200), 30);

ofSetColor(0);

ofDrawSphere(noise_location - glm::vec3(0, 0, 30), 10);

ofColor color;

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

auto distance = glm::distance(noise_location, glm::vec3(this->location_list[i], 0));

auto deg = glm::vec3();

auto noise_seed = glm::vec3(ofRandom(1000), ofRandom(1000), ofRandom(1000));

if (distance < 150) {

auto gap = glm::vec3(this->location_list[i], 0) - noise_location;

auto location = noise_location + glm::normalize(gap) * 150;

deg.x = ofMap(ofNoise(noise_seed.x, ofGetFrameNum() * 0.02), 0, 1, -180, 180);

deg.y = ofMap(ofNoise(noise_seed.y, ofGetFrameNum() * 0.02), 0, 1, -180, 180);

deg.z = ofMap(ofNoise(noise_seed.z, ofGetFrameNum() * 0.02), 0, 1, -180, 180);

ofPushMatrix();

ofTranslate(location);

ofRotateZ(deg.z);

ofRotateY(deg.y);

ofRotateX(deg.x);

this->index_list[i] = (this->index_list[i] + 1) % this->word.size();

}

else {

ofPushMatrix();

ofTranslate(this->location_list[i]);

ofRotateZ(deg.z);

ofRotateY(deg.y);

ofRotateX(deg.x);

}

ofPath chara_path = this->font.getCharacterAsPoints(this->word[this->index_list[i]], true, false);

vector<ofPolyline> outline = chara_path.getOutline();

ofFill();

ofSetColor(this->color_list[i], 128);

ofBeginShape();

for (int outline_index = 0; outline_index < outline.size(); outline_index++) {

ofNextContour(true);

auto vertices = outline[outline_index].getVertices();

for (auto& vertex : vertices) {

ofVertex(vertex + glm::vec2(-6, 8));

}

ofEndShape(true);

ofNoFill();

ofSetColor(this->color_list[i]);

ofBeginShape();

for (int outline_index = 0; outline_index < outline.size(); outline_index++) {

ofNextContour(true);

auto vertices = outline[outline_index].getVertices();

for (auto& vertex : vertices) {

ofVertex(vertex + glm::vec2(-6, 8));

}

ofEndShape(true);

ofPopMatrix();

}

this->cam.end();

}

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

int main() {

ofSetupOpenGL(720, 720, OF_WINDOW);

ofRunApp(new ofApp());

}

[ Link ]
https://github.com/junkiyoshi/Insta20230203

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2023年2月2日

Arrow from square. Draw by openFrameworks

[ Video ]

[ About ]
四角から矢印。

[ 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::vec2 make_point(int len, int param);
	void draw_arrow(glm::vec2 location, glm::vec2 target, float size, ofColor 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) {};

glm::vec2 make_point(int len, int param);

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

};

#include "ofApp.h"

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

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

	ofBackground(0);
}

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

	ofSeedRandom(39);
}

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

	ofTranslate(ofGetWindowSize() * 0.5);

	vector<ofColor> color_list;

	float len = 600;
	vector<glm::vec2> target_list;
	ofColor color;
	for (int i = 0; i < 3; i++) {

		auto noise_param = ofMap(ofNoise(ofRandom(1000), ofGetFrameNum() * 0.003), 0, 1, 0, 200);
		target_list.push_back(this->make_point(len, noise_param));

		color.setHsb(ofMap(i, 0, 3, 0, 255), 100, 255);
		color_list.push_back(color);
	}

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

		ofSetColor(color_list[i]);
		ofDrawCircle(target_list[i], 8);
	}

	for (int param = 0; param <= 100; param += 2) {

		auto location = this->make_point(len, param);

		auto target = target_list[0];
		auto index = 0;
		auto distance = glm::distance(location, target_list[0]);
		for (int i = 1; i < target_list.size(); i++) {

			if (distance > glm::distance(location, target_list[i])) {

				target = target_list[i];
				index = i;
				distance = glm::distance(location, target_list[i]);
			}
		}

		ofDrawCircle(this->make_point(len, param), 4);
		this->draw_arrow(this->make_point(len, param), target, 16, color_list[index]);
	}
}

//--------------------------------------------------------------
glm::vec2 ofApp::make_point(int len, int param) {

	param = param % 100;
	if (param < 25) {

		return glm::vec2(ofMap(param, 0, 25, -len * 0.5, len * 0.5), -len * 0.5);
	}
	else if (param < 50) {

		return glm::vec2(len * 0.5, ofMap(param, 25, 50, -len * 0.5, len * 0.5));
	}
	else if (param < 75) {

		return glm::vec2(ofMap(param, 50, 75, len * 0.5, -len * 0.5), len * 0.5);
	}
	else {

		return glm::vec2(-len * 0.5, ofMap(param, 75, 100, len * 0.5, -len * 0.5));
	}
}

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

	if (glm::distance(location, target) < size) return;

	auto angle = std::atan2(target.y - location.y, target.x - location.x);
	auto translate_location = target - glm::vec2(size * 3 * cos(angle), size * 3 * sin(angle));
	auto distance = glm::distance(translate_location, location);

	ofPushMatrix();
	ofTranslate(translate_location);

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

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

	ofPopMatrix();
}

//--------------------------------------------------------------
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);

}

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

void ofApp::update() {

ofSeedRandom(39);

}

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

void ofApp::draw() {

ofTranslate(ofGetWindowSize() * 0.5);

vector<ofColor> color_list;

float len = 600;

vector<glm::vec2> target_list;

ofColor color;

for (int i = 0; i < 3; i++) {

auto noise_param = ofMap(ofNoise(ofRandom(1000), ofGetFrameNum() * 0.003), 0, 1, 0, 200);

target_list.push_back(this->make_point(len, noise_param));

color.setHsb(ofMap(i, 0, 3, 0, 255), 100, 255);

color_list.push_back(color);

}

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

ofSetColor(color_list[i]);

ofDrawCircle(target_list[i], 8);

}

for (int param = 0; param <= 100; param += 2) {

auto location = this->make_point(len, param);

auto target = target_list[0];

auto index = 0;

auto distance = glm::distance(location, target_list[0]);

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

if (distance > glm::distance(location, target_list[i])) {

target = target_list[i];

index = i;

distance = glm::distance(location, target_list[i]);

}

ofDrawCircle(this->make_point(len, param), 4);

this->draw_arrow(this->make_point(len, param), target, 16, color_list[index]);

}

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

glm::vec2 ofApp::make_point(int len, int param) {

param = param % 100;

if (param < 25) {

return glm::vec2(ofMap(param, 0, 25, -len * 0.5, len * 0.5), -len * 0.5);

}

else if (param < 50) {

return glm::vec2(len * 0.5, ofMap(param, 25, 50, -len * 0.5, len * 0.5));

}

else if (param < 75) {

return glm::vec2(ofMap(param, 50, 75, len * 0.5, -len * 0.5), len * 0.5);

}

else {

return glm::vec2(-len * 0.5, ofMap(param, 75, 100, len * 0.5, -len * 0.5));

}

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

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

if (glm::distance(location, target) < size) return;

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

auto translate_location = target - glm::vec2(size * 3 * cos(angle), size * 3 * sin(angle));

auto distance = glm::distance(translate_location, location);

ofPushMatrix();

ofTranslate(translate_location);

ofSetColor(color);

ofFill();

ofBeginShape();

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

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

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

ofEndShape();

ofBeginShape();

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

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

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

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

ofEndShape();

ofPopMatrix();

}

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

int main() {

ofSetupOpenGL(720, 720, OF_WINDOW);

ofRunApp(new ofApp());

}

[ Link ]
https://github.com/junkiyoshi/Insta20230202

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