RandomWalk – ページ 55 – プログラミング de 落描き

2021年6月26日

Random walking box. Draw by openFrameworks

[ Video ]

[ About ]
ofSeedRandom()を使って、ofNoise()の1つ目の引数を固定する。
２つ目の引数にofGetFrameNum()を使うことで、１フレームづつの動きを付ける。

Use ofSeedRandom() to fix the first argument ofNoise().
By using ofGetFrameNum() as the second argument, we can add movement one frame at a time.

[ Source ]

#pragma once
#include "ofMain.h"

class ofApp : public ofBaseApp {

public:
	void setup();
	void update();
	void draw();

	void keyPressed(int key) {};
	void keyReleased(int key) {};
	void mouseMoved(int x, int y) {};
	void mouseDragged(int x, int y, int button) {};
	void mousePressed(int x, int y, int button) {};
	void mouseReleased(int x, int y, int button) {};
	void windowResized(int w, int h) {};
	void dragEvent(ofDragInfo dragInfo) {};
	void gotMessage(ofMessage msg) {};

	ofEasyCam cam;
};

#pragma once

#include "ofMain.h"

class ofApp : public ofBaseApp {

public:

void setup();

void update();

void draw();

void keyPressed(int key) {};

void keyReleased(int key) {};

void mouseMoved(int x, int y) {};

void mouseDragged(int x, int y, int button) {};

void mousePressed(int x, int y, int button) {};

void mouseReleased(int x, int y, int button) {};

void windowResized(int w, int h) {};

void dragEvent(ofDragInfo dragInfo) {};

void gotMessage(ofMessage msg) {};

ofEasyCam cam;

};

#include "ofApp.h"

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

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

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

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

	ofSeedRandom(39);
}

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

	this->cam.begin();
	
	auto noise_location_param = glm::vec3(ofRandom(1000), ofRandom(1000), ofRandom(1000));
	auto noise_rotation_param = glm::vec3(ofRandom(1000), ofRandom(1000), ofRandom(1000));
	auto number_of_log = 5;

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

		auto location = glm::vec3(
			ofMap(ofNoise(noise_location_param.x, ofGetFrameNum() * 0.008 + i * 0.08), 0, 1, -200, 200),
			ofMap(ofNoise(noise_location_param.y, ofGetFrameNum() * 0.008 + i * 0.08), 0, 1, -200, 200),
			ofMap(ofNoise(noise_location_param.z, ofGetFrameNum() * 0.008 + i * 0.08), 0, 1, -200, 200)
		);

		auto rotate = glm::vec3(
			ofMap(ofNoise(noise_rotation_param.x, ofGetFrameNum() * 0.008 + i * 0.08), 0, 1, -180, 180),
			ofMap(ofNoise(noise_rotation_param.y, ofGetFrameNum() * 0.008 + i * 0.08), 0, 1, -180, 180),
			ofMap(ofNoise(noise_rotation_param.z, ofGetFrameNum() * 0.008 + i * 0.08), 0, 1, -180, 180)
		);

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

		if (i == number_of_log) {
		
			ofSetColor(0);
			ofFill();
			ofDrawBox(glm::vec3(), 50);
		}

		ofColor line_color;
		line_color.setHsb((ofGetFrameNum() + i * 15) % 255, 255, 255);
		ofSetColor(line_color);
		ofNoFill();
		ofSetLineWidth(ofMap(i, 0, number_of_log, 0.3, 2));
		ofDrawBox(glm::vec3(), 50);

		ofPopMatrix();
	}

	this->cam.end();
}

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

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

#include "ofApp.h"

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

void ofApp::setup() {

ofSetFrameRate(60);

ofSetWindowTitle("openFrameworks");

ofBackground(0);

ofSetLineWidth(2);

ofEnableDepthTest();

}

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

void ofApp::update() {

ofSeedRandom(39);

}

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

void ofApp::draw() {

this->cam.begin();

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

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

auto number_of_log = 5;

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

auto location = glm::vec3(

ofMap(ofNoise(noise_location_param.x, ofGetFrameNum() * 0.008 + i * 0.08), 0, 1, -200, 200),

ofMap(ofNoise(noise_location_param.y, ofGetFrameNum() * 0.008 + i * 0.08), 0, 1, -200, 200),

ofMap(ofNoise(noise_location_param.z, ofGetFrameNum() * 0.008 + i * 0.08), 0, 1, -200, 200)

);

auto rotate = glm::vec3(

ofMap(ofNoise(noise_rotation_param.x, ofGetFrameNum() * 0.008 + i * 0.08), 0, 1, -180, 180),

ofMap(ofNoise(noise_rotation_param.y, ofGetFrameNum() * 0.008 + i * 0.08), 0, 1, -180, 180),

ofMap(ofNoise(noise_rotation_param.z, ofGetFrameNum() * 0.008 + i * 0.08), 0, 1, -180, 180)

);

ofPushMatrix();

ofTranslate(location);

ofRotateZ(rotate.z);

ofRotateY(rotate.y);

ofRotateX(rotate.x);

if (i == number_of_log) {

ofSetColor(0);

ofFill();

ofDrawBox(glm::vec3(), 50);

}

ofColor line_color;

line_color.setHsb((ofGetFrameNum() + i * 15) % 255, 255, 255);

ofSetColor(line_color);

ofNoFill();

ofSetLineWidth(ofMap(i, 0, number_of_log, 0.3, 2));

ofDrawBox(glm::vec3(), 50);

ofPopMatrix();

}

this->cam.end();

}

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

int main() {

ofSetupOpenGL(720, 720, OF_WINDOW);

ofRunApp(new ofApp());

}

[ Link ]
https://github.com/junkiyoshi/Insta20210626

[ほしいものリスト]
Amazon

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2021年6月24日2021年6月24日

Randam work of Kanji number. Draw by openFrameworks

[ Video ]

[ About ]
漢数字のランダムウォーク。
お互いの位置を確認して重ならない様に移動をする。
漢字は自身に近い数を表す。

Random walk of Kanji numbers.
Check each other’s position and move so that they do not overlap.
The Kanji character represents the number closest to itself.

[ Source ]

#pragma once
#include "ofMain.h"

class Actor {
public:
	Actor(vector<glm::vec3>& location_list, vector<vector<int>>& next_index_list, vector<int>& destination_list);
	void update(const int& frame_span, vector<glm::vec3>& location_list, vector<vector<int>>& next_index_list, vector<int>& destination_list);
	glm::vec3 get_location();
	glm::vec3 get_prev_location();

private:

	int select_index;
	int next_index;

	glm::vec3 location;
	glm::vec3 prev_location;
};

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) {};

	ofTrueTypeFont font;
	vector<string> word_list;

	vector<glm::vec3> location_list;
	vector<vector<int>> next_index_list;
	vector<int> destination_list;
	int span;

	vector<unique_ptr<Actor>> actor_list;
};

#pragma once

#include "ofMain.h"

class Actor {

public:

Actor(vector<glm::vec3>& location_list, vector<vector<int>>& next_index_list, vector<int>& destination_list);

void update(const int& frame_span, vector<glm::vec3>& location_list, vector<vector<int>>& next_index_list, vector<int>& destination_list);

glm::vec3 get_location();

glm::vec3 get_prev_location();

private:

int select_index;

int next_index;

glm::vec3 location;

glm::vec3 prev_location;

};

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) {};

ofTrueTypeFont font;

vector<string> word_list;

vector<glm::vec3> location_list;

vector<vector<int>> next_index_list;

vector<int> destination_list;

int span;

vector<unique_ptr<Actor>> actor_list;

};

#include "ofApp.h"	

//--------------------------------------------------------------
Actor::Actor(vector<glm::vec3>& location_list, vector<vector<int>>& next_index_list, vector<int>& destination_list) {

	this->select_index = ofRandom(location_list.size());
	while (true) {

		auto itr = find(destination_list.begin(), destination_list.end(), this->select_index);
		if (itr == destination_list.end()) {

			destination_list.push_back(this->select_index);
			break;
		}

		this->select_index = (this->select_index + 1) % location_list.size();
	}

	this->next_index = this->select_index;
}

//--------------------------------------------------------------
void Actor::update(const int& frame_span, vector<glm::vec3>& location_list, vector<vector<int>>& next_index_list, vector<int>& destination_list) {

	if (ofGetFrameNum() % frame_span == 0) {

		auto tmp_index = this->select_index;
		this->select_index = this->next_index;
		int retry = next_index_list[this->select_index].size() + 1;
		this->next_index = next_index_list[this->select_index][(int)ofRandom(next_index_list[this->select_index].size())];
		while (--retry > 0) {

			auto destination_itr = find(destination_list.begin(), destination_list.end(), this->next_index);
			if (destination_itr == destination_list.end()) {

				if (tmp_index != this->next_index) {

					destination_list.push_back(this->next_index);
					break;
				}
			}

			this->next_index = next_index_list[this->select_index][(this->next_index + 1) % next_index_list[this->select_index].size()];
		}
		if (retry <= 0) {

			destination_list.push_back(this->select_index);
			this->next_index = this->select_index;
		}
	}

	auto param = ofGetFrameNum() % frame_span;
	auto distance = location_list[this->next_index] - location_list[this->select_index];
	if (this->next_index != this->select_index) {

		this->prev_location = location;
	}
	this->location = location_list[this->select_index] + distance / frame_span * param;
}

//--------------------------------------------------------------
glm::vec3 Actor::get_location() {

	return this->location;
}

//--------------------------------------------------------------
glm::vec3 Actor::get_prev_location() {

	return this->prev_location;
}

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

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

	ofBackground(239);
	ofSetColor(39);
	ofSetLineWidth(2);
	ofNoFill();

	this->span = 50;
	for (int x = -200; x <= 200; x += span) {

		for (int y = -200; y <= 200; y += span) {

			this->location_list.push_back(glm::vec3(x, y, 0));
		}
	}

	for (auto& location : this->location_list) {

		vector<int> next_index = vector<int>();
		int index = -1;
		for (auto& other : this->location_list) {

			index++;
			if (location == other) { continue; }

			float distance = glm::distance(location, other);
			if (distance <= span + 1) {

				next_index.push_back(index);
			}
		}

		this->next_index_list.push_back(next_index);
	}

	for (int i = 0; i < 60; i++) {

		this->actor_list.push_back(make_unique<Actor>(this->location_list, this->next_index_list, this->destination_list));
	}

	ofTrueTypeFontSettings font_settings("fonts/msgothic.ttc", 25);
	font_settings.antialiased = true;
	font_settings.addRanges(ofAlphabet::Japanese);
	this->font.load(font_settings);

	this->word_list = {

		u8"零", u8"壱", u8"弐", u8"参", u8"四",
		u8"伍", u8"六", u8"七", u8"八", u8"九",
	};
}

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

	int frame_span = 15;
	int prev_index_size = 0;

	if (ofGetFrameNum() % frame_span == 0) {

		prev_index_size = this->destination_list.size();
	}

	for (auto& actor : this->actor_list) {

		actor->update(frame_span, this->location_list, this->next_index_list, this->destination_list);
	}

	if (prev_index_size != 0) {

		this->destination_list.erase(this->destination_list.begin(), this->destination_list.begin() + prev_index_size);
	}
}

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

	ofTranslate(ofGetWindowSize() * 0.5);

	vector<string> word_list;

	for (auto& actor : this->actor_list) {

		int count = 0;
		for (auto& other : this->actor_list) {

			if (actor == other) { continue; }

			if (glm::distance(actor->get_location(), other->get_location()) <= this->span * sqrt(2)) {

				count++;
			}
		}

		this->font.drawString(this->word_list[count], actor->get_location().x - this->font.stringWidth(this->word_list[count]) * 0.5, actor->get_location().y + this->font.stringHeight(this->word_list[count]) * 0.5);
	}

	for (int x = -200; x <= 200; x += this->span) {

		for (int y = -200; y <= 200; y += this->span) {

			ofDrawRectangle(glm::vec3(x - this->span * 0.5, y - this->span * 0.5, 0), this->span, this->span);
		}
	}	
}

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

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

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#include "ofApp.h"

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

Actor::Actor(vector<glm::vec3>& location_list, vector<vector<int>>& next_index_list, vector<int>& destination_list) {

this->select_index = ofRandom(location_list.size());

while (true) {

auto itr = find(destination_list.begin(), destination_list.end(), this->select_index);

if (itr == destination_list.end()) {

destination_list.push_back(this->select_index);

break;

}

this->select_index = (this->select_index + 1) % location_list.size();

}

this->next_index = this->select_index;

}

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

void Actor::update(const int& frame_span, vector<glm::vec3>& location_list, vector<vector<int>>& next_index_list, vector<int>& destination_list) {

if (ofGetFrameNum() % frame_span == 0) {

auto tmp_index = this->select_index;

this->select_index = this->next_index;

int retry = next_index_list[this->select_index].size() + 1;

this->next_index = next_index_list[this->select_index][(int)ofRandom(next_index_list[this->select_index].size())];

while (--retry > 0) {

auto destination_itr = find(destination_list.begin(), destination_list.end(), this->next_index);

if (destination_itr == destination_list.end()) {

if (tmp_index != this->next_index) {

destination_list.push_back(this->next_index);

break;

}

this->next_index = next_index_list[this->select_index][(this->next_index + 1) % next_index_list[this->select_index].size()];

}

if (retry <= 0) {

destination_list.push_back(this->select_index);

this->next_index = this->select_index;

}

auto param = ofGetFrameNum() % frame_span;

auto distance = location_list[this->next_index] - location_list[this->select_index];

if (this->next_index != this->select_index) {

this->prev_location = location;

}

this->location = location_list[this->select_index] + distance / frame_span * param;

}

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

glm::vec3 Actor::get_location() {

return this->location;

}

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

glm::vec3 Actor::get_prev_location() {

return this->prev_location;

}

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

void ofApp::setup() {

ofSetFrameRate(60);

ofSetWindowTitle("openFrameworks");

ofBackground(239);

ofSetColor(39);

ofSetLineWidth(2);

ofNoFill();

this->span = 50;

for (int x = -200; x <= 200; x += span) {

for (int y = -200; y <= 200; y += span) {

this->location_list.push_back(glm::vec3(x, y, 0));

}

for (auto& location : this->location_list) {

vector<int> next_index = vector<int>();

int index = -1;

for (auto& other : this->location_list) {

index++;

if (location == other) { continue; }

float distance = glm::distance(location, other);

if (distance <= span + 1) {

next_index.push_back(index);

}

this->next_index_list.push_back(next_index);

}

for (int i = 0; i < 60; i++) {

this->actor_list.push_back(make_unique<Actor>(this->location_list, this->next_index_list, this->destination_list));

}

ofTrueTypeFontSettings font_settings("fonts/msgothic.ttc", 25);

font_settings.antialiased = true;

font_settings.addRanges(ofAlphabet::Japanese);

this->font.load(font_settings);

this->word_list = {

u8"零", u8"壱", u8"弐", u8"参", u8"四",

u8"伍", u8"六", u8"七", u8"八", u8"九",

};

}

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

void ofApp::update() {

int frame_span = 15;

int prev_index_size = 0;

if (ofGetFrameNum() % frame_span == 0) {

prev_index_size = this->destination_list.size();

}

for (auto& actor : this->actor_list) {

actor->update(frame_span, this->location_list, this->next_index_list, this->destination_list);

}

if (prev_index_size != 0) {

this->destination_list.erase(this->destination_list.begin(), this->destination_list.begin() + prev_index_size);

}

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

void ofApp::draw() {

ofTranslate(ofGetWindowSize() * 0.5);

vector<string> word_list;

for (auto& actor : this->actor_list) {

int count = 0;

for (auto& other : this->actor_list) {

if (actor == other) { continue; }

if (glm::distance(actor->get_location(), other->get_location()) <= this->span * sqrt(2)) {

count++;

}

this->font.drawString(this->word_list[count], actor->get_location().x - this->font.stringWidth(this->word_list[count]) * 0.5, actor->get_location().y + this->font.stringHeight(this->word_list[count]) * 0.5);

}

for (int x = -200; x <= 200; x += this->span) {

for (int y = -200; y <= 200; y += this->span) {

ofDrawRectangle(glm::vec3(x - this->span * 0.5, y - this->span * 0.5, 0), this->span, this->span);

}

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

int main() {

ofSetupOpenGL(720, 720, OF_WINDOW);

ofRunApp(new ofApp());

}

[ Link ]
https://github.com/junkiyoshi/Insta20210624

[ Kinako ]

[ほしいものリスト]
Amazon

[ Sponsor Link ]

2021年6月16日2021年6月16日

RGB mask. Draw by openFrameworks

[ Video ]

[ About ]
RGB mask.

[ 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) {};

	ofImage image;
	ofFbo fbo;
};

#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) {};

ofImage image;

ofFbo fbo;

};

#include "ofApp.h"

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

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

	ofBackground(239);
	ofSetColor(255);
	ofSetRectMode(ofRectMode::OF_RECTMODE_CENTER);

	this->image.loadImage("images/lenna.png");
	this->image.resize(720, 720);
	this->fbo.allocate(720, 720);
}

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

	ofSeedRandom(39);

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

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

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

		switch (k % 3) {

		case 0:
			ofSetColor(255, 255, 0);
			break;
		case 1:
			ofSetColor(0, 255, 255);
			break;
		case 2:
			ofSetColor(255, 0, 255);
			break;
		}
		
		auto noise_seed = glm::vec2(ofRandom(1000), ofRandom(1000));

		ofMesh mesh;
		vector<glm::vec3> right, left;

		glm::vec3 last_location;
		float last_theta;
		int len = 100;
		int head_size = 45;

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

			auto location = glm::vec3(ofMap(ofNoise(noise_seed.x, (ofGetFrameNum() + i) * 0.008), 0, 1, -280, 280), ofMap(ofNoise(noise_seed.y, (ofGetFrameNum() + i) * 0.008), 0, 1, -280, 280), 0);
			auto next = glm::vec3(ofMap(ofNoise(noise_seed.x, (ofGetFrameNum() + i + 1) * 0.008), 0, 1, -280, 280), ofMap(ofNoise(noise_seed.y, (ofGetFrameNum() + i + 1) * 0.008), 0, 1, -280, 280), 0);

			auto direction = next - location;
			auto theta = atan2(direction.y, direction.x);

			right.push_back(location + glm::vec3(ofMap(i, 0, len, 0, head_size) * cos(theta + PI * 0.5), ofMap(i, 0, len, 0, head_size) * sin(theta + PI * 0.5), 0));
			left.push_back(location + glm::vec3(ofMap(i, 0, len, 0, head_size) * cos(theta - PI * 0.5), ofMap(i, 0, len, 0, head_size) * sin(theta - PI * 0.5), 0));

			last_location = location;
			last_theta = theta;
		}

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

			mesh.addVertex(left[i]);
			mesh.addVertex(right[i]);
		}

		for (int i = 0; i < mesh.getNumVertices() - 2; i += 2) {

			mesh.addIndex(i + 0); mesh.addIndex(i + 1); mesh.addIndex(i + 3);
			mesh.addIndex(i + 0); mesh.addIndex(i + 2); mesh.addIndex(i + 3);
		}

		auto tmp_head_size = ofMap(len - 2, 0, len, 0, head_size);
		mesh.addVertex(last_location);

		int index = mesh.getNumVertices();
		for (auto theta = last_theta - PI * 0.5; theta <= last_theta + PI * 0.5; theta += PI / 20) {

			mesh.addVertex(last_location + glm::vec3(tmp_head_size * cos(theta), tmp_head_size * sin(theta), 0));
		}

		for (int i = index; i < mesh.getNumVertices() - 1; i++) {

			mesh.addIndex(index); mesh.addIndex(i + 0); mesh.addIndex(i + 1);
		}

		mesh.draw();
	}

	ofDisableBlendMode();
	this->fbo.end();

	this->image.getTextureReference().setAlphaMask(this->fbo.getTexture());
	this->image.update();
}

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

	ofSetColor(255);
	this->image.draw(ofGetWindowSize() * 0.5);
}

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

ofSetColor(255);

ofSetRectMode(ofRectMode::OF_RECTMODE_CENTER);

this->image.loadImage("images/lenna.png");

this->image.resize(720, 720);

this->fbo.allocate(720, 720);

}

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

void ofApp::update() {

ofSeedRandom(39);

this->fbo.begin();

ofClear(0);

ofEnableBlendMode(ofBlendMode::OF_BLENDMODE_ADD);

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

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

switch (k % 3) {

case 0:

ofSetColor(255, 255, 0);

break;

case 1:

ofSetColor(0, 255, 255);

break;

case 2:

ofSetColor(255, 0, 255);

break;

}

auto noise_seed = glm::vec2(ofRandom(1000), ofRandom(1000));

ofMesh mesh;

vector<glm::vec3> right, left;

glm::vec3 last_location;

float last_theta;

int len = 100;

int head_size = 45;

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

auto location = glm::vec3(ofMap(ofNoise(noise_seed.x, (ofGetFrameNum() + i) * 0.008), 0, 1, -280, 280), ofMap(ofNoise(noise_seed.y, (ofGetFrameNum() + i) * 0.008), 0, 1, -280, 280), 0);

auto next = glm::vec3(ofMap(ofNoise(noise_seed.x, (ofGetFrameNum() + i + 1) * 0.008), 0, 1, -280, 280), ofMap(ofNoise(noise_seed.y, (ofGetFrameNum() + i + 1) * 0.008), 0, 1, -280, 280), 0);

auto direction = next - location;

auto theta = atan2(direction.y, direction.x);

right.push_back(location + glm::vec3(ofMap(i, 0, len, 0, head_size) * cos(theta + PI * 0.5), ofMap(i, 0, len, 0, head_size) * sin(theta + PI * 0.5), 0));

left.push_back(location + glm::vec3(ofMap(i, 0, len, 0, head_size) * cos(theta - PI * 0.5), ofMap(i, 0, len, 0, head_size) * sin(theta - PI * 0.5), 0));

last_location = location;

last_theta = theta;

}

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

mesh.addVertex(left[i]);

mesh.addVertex(right[i]);

}

for (int i = 0; i < mesh.getNumVertices() - 2; i += 2) {

mesh.addIndex(i + 0); mesh.addIndex(i + 1); mesh.addIndex(i + 3);

mesh.addIndex(i + 0); mesh.addIndex(i + 2); mesh.addIndex(i + 3);

}

auto tmp_head_size = ofMap(len - 2, 0, len, 0, head_size);

mesh.addVertex(last_location);

int index = mesh.getNumVertices();

for (auto theta = last_theta - PI * 0.5; theta <= last_theta + PI * 0.5; theta += PI / 20) {

mesh.addVertex(last_location + glm::vec3(tmp_head_size * cos(theta), tmp_head_size * sin(theta), 0));

}

for (int i = index; i < mesh.getNumVertices() - 1; i++) {

mesh.addIndex(index); mesh.addIndex(i + 0); mesh.addIndex(i + 1);

}

mesh.draw();

}

ofDisableBlendMode();

this->fbo.end();

this->image.getTextureReference().setAlphaMask(this->fbo.getTexture());

this->image.update();

}

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

void ofApp::draw() {

ofSetColor(255);

this->image.draw(ofGetWindowSize() * 0.5);

}

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

int main() {

ofSetupOpenGL(720, 720, OF_WINDOW);

ofRunApp(new ofApp());

}

[ Link ]
https://github.com/junkiyoshi/Insta20210616

[ Kinako ]

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