openFrameworks – ページ 398 – プログラミング de 落描き

2021年11月16日2021年11月16日

How animation by noise works. Draw by openFrameworks

[ Video ]

[ About ]
多角形の数、回転、色がノイズの値で変化する事を可視化。

Visualize that the number, rotation, and color of polygons change with the value of 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) {};
};

#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) {};

};

#include "ofApp.h"

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

	ofSetFrameRate(60);
	ofSetWindowTitle("openFrameworks");

	ofBackground(255);
	ofSetRectMode(ofRectMode::OF_RECTMODE_CENTER);

	ofSetCircleResolution(36);
}

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

	ofSeedRandom(39);
}

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

	ofTranslate(ofGetWindowSize() * 0.5);

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

	ofSetLineWidth(2);
	ofSetColor(0);

	// Param 1
	ofBeginShape();
	for (int x = 340; x >= 120; x -= 1) {

		tmp_y = ofMap(ofNoise(noise_seed.x, x * 0.005 + ofGetFrameNum() * 0.01), 0, 1, -100, 100);
		ofVertex(x, tmp_y);
	}
	ofEndShape();

	ofDrawLine(glm::vec2(120, -100), glm::vec2(120, 100));
	ofDrawLine(glm::vec2(340, -100), glm::vec2(340, 100));

	ofColor color;
	int hue = ofMap(ofNoise(noise_seed.x, 120 * 0.005 + ofGetFrameNum() * 0.01), 0, 1, 0, 255);
	color.setHsb(hue, 230, 255);

	ofSetColor(color);
	ofFill();
	ofDrawCircle(glm::vec2(120, tmp_y), 15);

	ofSetColor(0);
	ofNoFill();
	ofDrawCircle(glm::vec2(120, tmp_y), 15);

	// Param 2
	ofBeginShape();
	for (int x = -340; x <= -120; x += 1) {

		tmp_y = ofMap(ofNoise(noise_seed.y, x * 0.005 - ofGetFrameNum() * 0.01), 0, 1, -100, 100);
		ofVertex(x, tmp_y);
	}
	ofEndShape();

	ofDrawLine(glm::vec2(-120, -100), glm::vec2(-120, 100));
	ofDrawLine(glm::vec2(-340, -100), glm::vec2(-340, 100));

	int gon = ofMap(ofNoise(noise_seed.y, -120 * 0.005 - ofGetFrameNum() * 0.01), 0, 1, 3, 8);
	int deg_span = 360 / gon;

	ofSetColor(255);
	ofFill();
	ofBeginShape();
	for (int deg = 0; deg < 360; deg += deg_span) {

		ofVertex(glm::vec2(15 * cos(deg * DEG_TO_RAD), 15 * sin(deg * DEG_TO_RAD)) + glm::vec2(-120, tmp_y));
	}
	ofEndShape(true);

	ofSetColor(0);
	ofNoFill();
	ofBeginShape();
	for (int deg = 0; deg < 360; deg += deg_span) {

		ofVertex(glm::vec2(15 * cos(deg * DEG_TO_RAD), 15 * sin(deg * DEG_TO_RAD)) + glm::vec2(-120, tmp_y));
	}
	ofEndShape(true);
	
	// Param 3
	ofBeginShape();
	for (int y = -340; y <= -120; y += 1) {

		tmp_x = ofMap(ofNoise(noise_seed.z, y * 0.005 - ofGetFrameNum() * 0.01), 0, 1, -100, 100);
		ofVertex(tmp_x, y);
	}
	ofEndShape();

	ofDrawLine(glm::vec2(-100, -120), glm::vec2(100, -120));
	ofDrawLine(glm::vec2(-100, -340), glm::vec2(100, -340));

	int deg_start = ofMap(ofNoise(noise_seed.z, -120 * 0.005 - ofGetFrameNum() * 0.01), 0, 1, 0, 360);
	
	ofSetColor(255);
	ofFill();
	ofBeginShape();
	for (int deg = deg_start; deg < deg_start + 360; deg += 90) {

		ofVertex(glm::vec2(15 * cos(deg * DEG_TO_RAD), 15 * sin(deg * DEG_TO_RAD)) + glm::vec2(tmp_x, -120));
	}
	ofEndShape(true);

	ofSetColor(0);
	ofNoFill();
	ofBeginShape();
	for (int deg = deg_start; deg < deg_start + 360; deg += 90) {

		ofVertex(glm::vec2(15 * cos(deg * DEG_TO_RAD), 15 * sin(deg * DEG_TO_RAD)) + glm::vec2(tmp_x, -120));
	}
	ofEndShape(true);

	// Draw
	ofSetLineWidth(2);
	for (int y = 250; y > 0; y -= 10) {

		hue = ofMap(ofNoise(noise_seed.x, 120 * 0.005 + (ofGetFrameNum() - y / 5) * 0.01), 0, 1, 0, 255);
		color.setHsb(hue, 230, 255);

		gon = ofMap(ofNoise(noise_seed.y, -120 * 0.005 - (ofGetFrameNum() - y / 5) * 0.01), 0, 1, 3, 8);
		deg_span = 360 / gon;

		int deg_start = ofMap(ofNoise(noise_seed.z, -120 * 0.005 - (ofGetFrameNum() - y / 5) * 0.01), 0, 1, 0, 360);
		float alpha = ofMap(y, 320, 0, 0, 255);

		ofSetColor(color, alpha);
		ofFill();
		ofBeginShape();
		for (int deg = deg_start; deg <= deg_start + 360; deg += deg_span) {

			ofVertex(glm::vec2(85 * cos(deg * DEG_TO_RAD), 85 * sin(deg * DEG_TO_RAD)) + glm::vec2(0, y));
		}
		ofEndShape(true);

		ofSetColor(255, alpha);
		ofNoFill();
		ofBeginShape();
		for (int deg = deg_start; deg <= deg_start + 360; deg += deg_span) {

			ofVertex(glm::vec2(85 * cos(deg * DEG_TO_RAD), 85 * sin(deg * DEG_TO_RAD)) + glm::vec2(0, y));
		}
		ofEndShape(true);
	}
}

//--------------------------------------------------------------6
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);

ofSetRectMode(ofRectMode::OF_RECTMODE_CENTER);

ofSetCircleResolution(36);

}

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

void ofApp::update() {

ofSeedRandom(39);

}

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

void ofApp::draw() {

ofTranslate(ofGetWindowSize() * 0.5);

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

int tmp_x, tmp_y;

ofSetLineWidth(2);

ofSetColor(0);

// Param 1

ofBeginShape();

for (int x = 340; x >= 120; x -= 1) {

tmp_y = ofMap(ofNoise(noise_seed.x, x * 0.005 + ofGetFrameNum() * 0.01), 0, 1, -100, 100);

ofVertex(x, tmp_y);

}

ofEndShape();

ofDrawLine(glm::vec2(120, -100), glm::vec2(120, 100));

ofDrawLine(glm::vec2(340, -100), glm::vec2(340, 100));

ofColor color;

int hue = ofMap(ofNoise(noise_seed.x, 120 * 0.005 + ofGetFrameNum() * 0.01), 0, 1, 0, 255);

color.setHsb(hue, 230, 255);

ofSetColor(color);

ofFill();

ofDrawCircle(glm::vec2(120, tmp_y), 15);

ofSetColor(0);

ofNoFill();

ofDrawCircle(glm::vec2(120, tmp_y), 15);

// Param 2

ofBeginShape();

for (int x = -340; x <= -120; x += 1) {

tmp_y = ofMap(ofNoise(noise_seed.y, x * 0.005 - ofGetFrameNum() * 0.01), 0, 1, -100, 100);

ofVertex(x, tmp_y);

}

ofEndShape();

ofDrawLine(glm::vec2(-120, -100), glm::vec2(-120, 100));

ofDrawLine(glm::vec2(-340, -100), glm::vec2(-340, 100));

int gon = ofMap(ofNoise(noise_seed.y, -120 * 0.005 - ofGetFrameNum() * 0.01), 0, 1, 3, 8);

int deg_span = 360 / gon;

ofSetColor(255);

ofFill();

ofBeginShape();

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

ofVertex(glm::vec2(15 * cos(deg * DEG_TO_RAD), 15 * sin(deg * DEG_TO_RAD)) + glm::vec2(-120, tmp_y));

}

ofEndShape(true);

ofSetColor(0);

ofNoFill();

ofBeginShape();

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

ofVertex(glm::vec2(15 * cos(deg * DEG_TO_RAD), 15 * sin(deg * DEG_TO_RAD)) + glm::vec2(-120, tmp_y));

}

ofEndShape(true);

// Param 3

ofBeginShape();

for (int y = -340; y <= -120; y += 1) {

tmp_x = ofMap(ofNoise(noise_seed.z, y * 0.005 - ofGetFrameNum() * 0.01), 0, 1, -100, 100);

ofVertex(tmp_x, y);

}

ofEndShape();

ofDrawLine(glm::vec2(-100, -120), glm::vec2(100, -120));

ofDrawLine(glm::vec2(-100, -340), glm::vec2(100, -340));

int deg_start = ofMap(ofNoise(noise_seed.z, -120 * 0.005 - ofGetFrameNum() * 0.01), 0, 1, 0, 360);

ofSetColor(255);

ofFill();

ofBeginShape();

for (int deg = deg_start; deg < deg_start + 360; deg += 90) {

ofVertex(glm::vec2(15 * cos(deg * DEG_TO_RAD), 15 * sin(deg * DEG_TO_RAD)) + glm::vec2(tmp_x, -120));

}

ofEndShape(true);

ofSetColor(0);

ofNoFill();

ofBeginShape();

for (int deg = deg_start; deg < deg_start + 360; deg += 90) {

ofVertex(glm::vec2(15 * cos(deg * DEG_TO_RAD), 15 * sin(deg * DEG_TO_RAD)) + glm::vec2(tmp_x, -120));

}

ofEndShape(true);

// Draw

ofSetLineWidth(2);

for (int y = 250; y > 0; y -= 10) {

hue = ofMap(ofNoise(noise_seed.x, 120 * 0.005 + (ofGetFrameNum() - y / 5) * 0.01), 0, 1, 0, 255);

color.setHsb(hue, 230, 255);

gon = ofMap(ofNoise(noise_seed.y, -120 * 0.005 - (ofGetFrameNum() - y / 5) * 0.01), 0, 1, 3, 8);

deg_span = 360 / gon;

int deg_start = ofMap(ofNoise(noise_seed.z, -120 * 0.005 - (ofGetFrameNum() - y / 5) * 0.01), 0, 1, 0, 360);

float alpha = ofMap(y, 320, 0, 0, 255);

ofSetColor(color, alpha);

ofFill();

ofBeginShape();

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

ofVertex(glm::vec2(85 * cos(deg * DEG_TO_RAD), 85 * sin(deg * DEG_TO_RAD)) + glm::vec2(0, y));

}

ofEndShape(true);

ofSetColor(255, alpha);

ofNoFill();

ofBeginShape();

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

ofVertex(glm::vec2(85 * cos(deg * DEG_TO_RAD), 85 * sin(deg * DEG_TO_RAD)) + glm::vec2(0, y));

}

ofEndShape(true);

}

//--------------------------------------------------------------6

int main() {

ofSetupOpenGL(720, 720, OF_WINDOW);

ofRunApp(new ofApp());

}

[ Link ]
https://github.com/junkiyoshi/Insta20211116

2021年11月15日2021年11月15日

Gradation one-sixth torus. Draw by openFrameworks

[ Video ]

[ About ]
欠けているトーラスをグラデーションで色付けする。

Color the missing torus with a gradient.

[ 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);
	ofEnableDepthTest();
}

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

	ofSeedRandom(39);
}

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

	this->cam.begin();

	int count = 0;
	for (int x = -300; x <= 300; x += 600) {

		for (int y = -300; y <= 300; y += 600) {

			ofPushMatrix();
			ofTranslate(x, y, 0);
			ofRotateY(count++ * 45 + ofGetFrameNum());

			for (int r = 60; r <= 90; r += 30) {

				int v_span = 1;
				int u_span = 60;

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

					bool flag = true;
					int u_start = ofMap(ofNoise(r * cos(v * DEG_TO_RAD)  * 0.008, r * sin(v * DEG_TO_RAD) * 0.008, ofGetFrameNum() * 0.0035), 0, 1, -360, 360);
					int next_u = ofMap(ofNoise(r * cos((v + v_span) * DEG_TO_RAD) * 0.008, r * sin((v + v_span) * DEG_TO_RAD) * 0.008, ofGetFrameNum() * 0.0035), 0, 1, -360, 360);
					for (int u = u_start; u < u_start + 360; u += u_span) {

						if (flag) {

							face.addVertex(this->make_point(200, r, u, v));
							face.addVertex(this->make_point(200, r, u + u_span, v));
							face.addVertex(this->make_point(200, r, next_u + u_span, v + v_span));
							face.addVertex(this->make_point(200, r, next_u, v + v_span));

							line.addVertex(this->make_point(200, r, u, v));
							line.addVertex(this->make_point(200, r, u + u_span, v));
							line.addVertex(this->make_point(200, r, next_u + u_span, v + v_span));
							line.addVertex(this->make_point(200, r, next_u, v + v_span));

							ofColor color;
							auto hue = (count * 64 + r * 4 + (int)ofMap(v, 0, 360, 0, 255)) % 255;
							color.setHsb(hue, 180, 255);

							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;
						flag = !flag;
					}
				}

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

			ofPopMatrix();
		}
	}

	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);

ofEnableDepthTest();

}

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

void ofApp::update() {

ofSeedRandom(39);

}

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

void ofApp::draw() {

this->cam.begin();

int count = 0;

for (int x = -300; x <= 300; x += 600) {

for (int y = -300; y <= 300; y += 600) {

ofPushMatrix();

ofTranslate(x, y, 0);

ofRotateY(count++ * 45 + ofGetFrameNum());

for (int r = 60; r <= 90; r += 30) {

int v_span = 1;

int u_span = 60;

ofMesh face, line;

line.setMode(ofPrimitiveMode::OF_PRIMITIVE_LINES);

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

bool flag = true;

int u_start = ofMap(ofNoise(r * cos(v * DEG_TO_RAD) * 0.008, r * sin(v * DEG_TO_RAD) * 0.008, ofGetFrameNum() * 0.0035), 0, 1, -360, 360);

int next_u = ofMap(ofNoise(r * cos((v + v_span) * DEG_TO_RAD) * 0.008, r * sin((v + v_span) * DEG_TO_RAD) * 0.008, ofGetFrameNum() * 0.0035), 0, 1, -360, 360);

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

if (flag) {

face.addVertex(this->make_point(200, r, u, v));

face.addVertex(this->make_point(200, r, u + u_span, v));

face.addVertex(this->make_point(200, r, next_u + u_span, v + v_span));

face.addVertex(this->make_point(200, r, next_u, v + v_span));

line.addVertex(this->make_point(200, r, u, v));

line.addVertex(this->make_point(200, r, u + u_span, v));

line.addVertex(this->make_point(200, r, next_u + u_span, v + v_span));

line.addVertex(this->make_point(200, r, next_u, v + v_span));

ofColor color;

auto hue = (count * 64 + r * 4 + (int)ofMap(v, 0, 360, 0, 255)) % 255;

color.setHsb(hue, 180, 255);

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;

flag = !flag;

}

face.drawFaces();

line.drawWireframe();

}

ofPopMatrix();

}

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/Insta20211115

2021年11月14日

Target was pointed. Draw by openFrameworks

[ Video ]

[ About ]
ターゲットを指さす矢印。

An arrow pointing to the target.

[ 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 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 color);

};

#include "ofApp.h"

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

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

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

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

	ofSeedRandom(39);
}

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

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

	auto target = glm::vec2(ofMap(ofNoise(ofRandom(1000), ofGetFrameNum() * 0.0125), 0, 1, -250, 250), ofMap(ofNoise(ofRandom(1000), ofGetFrameNum() * 0.0125), 0, 1, -250, 250));
	ofDrawCircle(target, 10);

	for (int deg = 0; deg < 360; deg += 18) {

		int x = 300 * cos(deg * DEG_TO_RAD);
		int y = 300 * sin(deg * DEG_TO_RAD);
		this->draw_arrow(glm::vec2(x, y), target, 18, ofColor(39));
	}
}

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

	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();

	ofDrawCircle(location, 5);
}

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

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

#include "ofApp.h"

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

void ofApp::setup() {

ofSetFrameRate(60);

ofSetWindowTitle("openframeworks");

ofBackground(255);

ofSetColor(0);

ofSetLineWidth(2);

}

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

void ofApp::update() {

ofSeedRandom(39);

}

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

void ofApp::draw() {

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

auto target = glm::vec2(ofMap(ofNoise(ofRandom(1000), ofGetFrameNum() * 0.0125), 0, 1, -250, 250), ofMap(ofNoise(ofRandom(1000), ofGetFrameNum() * 0.0125), 0, 1, -250, 250));

ofDrawCircle(target, 10);

for (int deg = 0; deg < 360; deg += 18) {

int x = 300 * cos(deg * DEG_TO_RAD);

int y = 300 * sin(deg * DEG_TO_RAD);

this->draw_arrow(glm::vec2(x, y), target, 18, ofColor(39));

}

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

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

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();

ofDrawCircle(location, 5);

}

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

int main() {

ofSetupOpenGL(720, 720, OF_WINDOW);

ofRunApp(new ofApp());

}

[ Link ]
https://github.com/junkiyoshi/Insta20211114

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