circle – ページ 65 – プログラミング de 落描き

2020年8月17日2020年8月17日

Dancing Wall. Draw by openFrameworks

[ Video ]

[ About ]
踊る壁。

Dancing Wall.

[ 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 setRingToMesh(ofMesh& face_target, ofMesh& frame_target, glm::vec3 location, float radius, float width, float height, int deg_start, int deg_end);

	ofEasyCam cam;
	ofMesh face, frame;
};

#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 setRingToMesh(ofMesh& face_target, ofMesh& frame_target, glm::vec3 location, float radius, float width, float height, int deg_start, int deg_end);

ofEasyCam cam;

ofMesh face, frame;

};

#include "ofApp.h"

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

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

	ofBackground(239);
	ofEnableDepthTest();

	this->frame.setMode(ofPrimitiveMode::OF_PRIMITIVE_LINES);
}

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

	ofSeedRandom(39);

	this->face.clear();
	this->frame.clear();

	int deg_span = 30;
	for (int radius = 50; radius <= 350; radius += 30) {

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

			auto height = ofMap(ofNoise(radius  * cos(deg * DEG_TO_RAD) * 0.005, radius * sin(deg * DEG_TO_RAD) * 0.005, ofGetFrameNum() * 0.018), 0, 1, 0, ofMap(radius, 50, 350, 100, 200));
			this->setRingToMesh(this->face, this->frame, glm::vec3(0, 0, height * -0.5), radius, 14, height, deg, deg + deg_span - 6);
		}
	}
}

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

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

	ofSetColor(39);
	this->face.draw();

	ofSetColor(239);
	this->frame.drawWireframe();

	this->cam.end();
}

//--------------------------------------------------------------
void ofApp::setRingToMesh(ofMesh& face_target, ofMesh& frame_target, glm::vec3 location, float radius, float width, float height, int deg_start, int deg_end) {

	if (deg_start == deg_end) { return; }

	int index = face_target.getNumVertices();

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

		auto face_index = face_target.getNumVertices();

		vector<glm::vec3> vertices;
		vertices.push_back(glm::vec3((radius + width * 0.5) * cos(deg * DEG_TO_RAD), (radius + width * 0.5) * sin(deg * DEG_TO_RAD), height * -0.5));
		vertices.push_back(glm::vec3((radius + width * 0.5) * cos((deg + 1) * DEG_TO_RAD), (radius + width * 0.5) * sin((deg + 1) * DEG_TO_RAD), height * -0.5));
		vertices.push_back(glm::vec3((radius + width * 0.5) * cos((deg + 1) * DEG_TO_RAD), (radius + width * 0.5) * sin((deg + 1) * DEG_TO_RAD), height * 0.5));
		vertices.push_back(glm::vec3((radius + width * 0.5) * cos(deg * DEG_TO_RAD), (radius + width * 0.5) * sin(deg * DEG_TO_RAD), height * 0.5));

		vertices.push_back(glm::vec3((radius - width * 0.5) * cos(deg * DEG_TO_RAD), (radius - width * 0.5) * sin(deg * DEG_TO_RAD), height * -0.5));
		vertices.push_back(glm::vec3((radius - width * 0.5) * cos((deg + 1) * DEG_TO_RAD), (radius - width * 0.5) * sin((deg + 1) * DEG_TO_RAD), height * -0.5));
		vertices.push_back(glm::vec3((radius - width * 0.5) * cos((deg + 1) * DEG_TO_RAD), (radius - width * 0.5) * sin((deg + 1) * DEG_TO_RAD), height * 0.5));
		vertices.push_back(glm::vec3((radius - width * 0.5) * cos(deg * DEG_TO_RAD), (radius - width * 0.5) * sin(deg * DEG_TO_RAD), height * 0.5));

		for (auto& vertex : vertices) {

			vertex += location;
		}

		face_target.addVertices(vertices);

		face_target.addIndex(face_index + 0); face_target.addIndex(face_index + 1); face_target.addIndex(face_index + 2);
		face_target.addIndex(face_index + 0); face_target.addIndex(face_index + 2); face_target.addIndex(face_index + 3);

		face_target.addIndex(face_index + 4); face_target.addIndex(face_index + 5); face_target.addIndex(face_index + 6);
		face_target.addIndex(face_index + 4); face_target.addIndex(face_index + 6); face_target.addIndex(face_index + 7);

		face_target.addIndex(face_index + 0); face_target.addIndex(face_index + 4); face_target.addIndex(face_index + 5);
		face_target.addIndex(face_index + 0); face_target.addIndex(face_index + 5); face_target.addIndex(face_index + 1);

		face_target.addIndex(face_index + 3); face_target.addIndex(face_index + 7); face_target.addIndex(face_index + 6);
		face_target.addIndex(face_index + 3); face_target.addIndex(face_index + 6); face_target.addIndex(face_index + 2);

		auto frame_index = frame_target.getNumVertices();

		frame_target.addVertices(vertices);

		frame_target.addIndex(frame_index + 0); frame_target.addIndex(frame_index + 1);
		frame_target.addIndex(frame_index + 2); frame_target.addIndex(frame_index + 3);
		frame_target.addIndex(frame_index + 4); frame_target.addIndex(frame_index + 5);
		frame_target.addIndex(frame_index + 6); frame_target.addIndex(frame_index + 7);
	}

	face_target.addIndex(index + 0); face_target.addIndex(index + 3); face_target.addIndex(index + 7);
	face_target.addIndex(index + 0); face_target.addIndex(index + 7); face_target.addIndex(index + 4);

	frame_target.addIndex(index + 0); frame_target.addIndex(index + 3);
	frame_target.addIndex(index + 0); frame_target.addIndex(index + 4);
	frame_target.addIndex(index + 7); frame_target.addIndex(index + 3);
	frame_target.addIndex(index + 7); frame_target.addIndex(index + 4);

	index = frame_target.getNumVertices() - 8;

	face_target.addIndex(index + 1); face_target.addIndex(index + 2); face_target.addIndex(index + 6);
	face_target.addIndex(index + 1); face_target.addIndex(index + 6); face_target.addIndex(index + 5);

	frame_target.addIndex(index + 1); frame_target.addIndex(index + 2);
	frame_target.addIndex(index + 1); frame_target.addIndex(index + 5);
	frame_target.addIndex(index + 6); frame_target.addIndex(index + 2);
	frame_target.addIndex(index + 6); frame_target.addIndex(index + 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);

ofEnableDepthTest();

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

}

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

void ofApp::update() {

ofSeedRandom(39);

this->face.clear();

this->frame.clear();

int deg_span = 30;

for (int radius = 50; radius <= 350; radius += 30) {

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

auto height = ofMap(ofNoise(radius * cos(deg * DEG_TO_RAD) * 0.005, radius * sin(deg * DEG_TO_RAD) * 0.005, ofGetFrameNum() * 0.018), 0, 1, 0, ofMap(radius, 50, 350, 100, 200));

this->setRingToMesh(this->face, this->frame, glm::vec3(0, 0, height * -0.5), radius, 14, height, deg, deg + deg_span - 6);

}

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

void ofApp::draw() {

this->cam.begin();

ofRotateX(120);

ofSetColor(39);

this->face.draw();

ofSetColor(239);

this->frame.drawWireframe();

this->cam.end();

}

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

void ofApp::setRingToMesh(ofMesh& face_target, ofMesh& frame_target, glm::vec3 location, float radius, float width, float height, int deg_start, int deg_end) {

if (deg_start == deg_end) { return; }

int index = face_target.getNumVertices();

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

auto face_index = face_target.getNumVertices();

vector<glm::vec3> vertices;

vertices.push_back(glm::vec3((radius + width * 0.5) * cos(deg * DEG_TO_RAD), (radius + width * 0.5) * sin(deg * DEG_TO_RAD), height * -0.5));

vertices.push_back(glm::vec3((radius + width * 0.5) * cos((deg + 1) * DEG_TO_RAD), (radius + width * 0.5) * sin((deg + 1) * DEG_TO_RAD), height * -0.5));

vertices.push_back(glm::vec3((radius + width * 0.5) * cos((deg + 1) * DEG_TO_RAD), (radius + width * 0.5) * sin((deg + 1) * DEG_TO_RAD), height * 0.5));

vertices.push_back(glm::vec3((radius + width * 0.5) * cos(deg * DEG_TO_RAD), (radius + width * 0.5) * sin(deg * DEG_TO_RAD), height * 0.5));

vertices.push_back(glm::vec3((radius - width * 0.5) * cos(deg * DEG_TO_RAD), (radius - width * 0.5) * sin(deg * DEG_TO_RAD), height * -0.5));

vertices.push_back(glm::vec3((radius - width * 0.5) * cos((deg + 1) * DEG_TO_RAD), (radius - width * 0.5) * sin((deg + 1) * DEG_TO_RAD), height * -0.5));

vertices.push_back(glm::vec3((radius - width * 0.5) * cos((deg + 1) * DEG_TO_RAD), (radius - width * 0.5) * sin((deg + 1) * DEG_TO_RAD), height * 0.5));

vertices.push_back(glm::vec3((radius - width * 0.5) * cos(deg * DEG_TO_RAD), (radius - width * 0.5) * sin(deg * DEG_TO_RAD), height * 0.5));

for (auto& vertex : vertices) {

vertex += location;

}

face_target.addVertices(vertices);

face_target.addIndex(face_index + 0); face_target.addIndex(face_index + 1); face_target.addIndex(face_index + 2);

face_target.addIndex(face_index + 0); face_target.addIndex(face_index + 2); face_target.addIndex(face_index + 3);

face_target.addIndex(face_index + 4); face_target.addIndex(face_index + 5); face_target.addIndex(face_index + 6);

face_target.addIndex(face_index + 4); face_target.addIndex(face_index + 6); face_target.addIndex(face_index + 7);

face_target.addIndex(face_index + 0); face_target.addIndex(face_index + 4); face_target.addIndex(face_index + 5);

face_target.addIndex(face_index + 0); face_target.addIndex(face_index + 5); face_target.addIndex(face_index + 1);

face_target.addIndex(face_index + 3); face_target.addIndex(face_index + 7); face_target.addIndex(face_index + 6);

face_target.addIndex(face_index + 3); face_target.addIndex(face_index + 6); face_target.addIndex(face_index + 2);

auto frame_index = frame_target.getNumVertices();

frame_target.addVertices(vertices);

frame_target.addIndex(frame_index + 0); frame_target.addIndex(frame_index + 1);

frame_target.addIndex(frame_index + 2); frame_target.addIndex(frame_index + 3);

frame_target.addIndex(frame_index + 4); frame_target.addIndex(frame_index + 5);

frame_target.addIndex(frame_index + 6); frame_target.addIndex(frame_index + 7);

}

face_target.addIndex(index + 0); face_target.addIndex(index + 3); face_target.addIndex(index + 7);

face_target.addIndex(index + 0); face_target.addIndex(index + 7); face_target.addIndex(index + 4);

frame_target.addIndex(index + 0); frame_target.addIndex(index + 3);

frame_target.addIndex(index + 0); frame_target.addIndex(index + 4);

frame_target.addIndex(index + 7); frame_target.addIndex(index + 3);

frame_target.addIndex(index + 7); frame_target.addIndex(index + 4);

index = frame_target.getNumVertices() - 8;

face_target.addIndex(index + 1); face_target.addIndex(index + 2); face_target.addIndex(index + 6);

face_target.addIndex(index + 1); face_target.addIndex(index + 6); face_target.addIndex(index + 5);

frame_target.addIndex(index + 1); frame_target.addIndex(index + 2);

frame_target.addIndex(index + 1); frame_target.addIndex(index + 5);

frame_target.addIndex(index + 6); frame_target.addIndex(index + 2);

frame_target.addIndex(index + 6); frame_target.addIndex(index + 5);

}

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

int main() {

ofSetupOpenGL(720, 720, OF_WINDOW);

ofRunApp(new ofApp());

}

[ Link ]
https://github.com/junkiyoshi/Insta20200817

[ほしいものリスト]
Amazon

[ Sponsor Link ]

2020年8月16日

Circle inside a circle. Draw by openFrameworks

[ Video ]

[ About ]
円の中に円を描いて出来た柄。

The pattern is made up of a circle with a circle inside a 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 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(239);
	ofSetColor(39, 64);
	ofNoFill();
	ofSetCircleResolution(72);
	ofSetLineWidth(0.2);
}

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

	ofSeedRandom(39);
}

//--------------------------------------------------------------
void ofApp::draw() {
	
	for (int x = 210; x < ofGetWidth(); x += 300) {

		for (int y = 210; y < ofGetHeight(); y += 300) {

			ofPushMatrix();
			ofTranslate(x, y);

			int radius_start = 120;
			int radius_span = 1;
			auto noise_seed = ofRandom(1000);

			ofDrawCircle(glm::vec2(), radius_start);
			for (int radius = radius_start - radius_span; radius >= 0; radius -= radius_span) {

				auto tmp_radius = radius_span;
				auto deg = ofMap(ofNoise(noise_seed + radius * 0.005 - ofGetFrameNum() * 0.015), 0, 1, -720, 720);
				auto location = glm::vec2(tmp_radius * cos(deg * DEG_TO_RAD), tmp_radius * sin(deg * DEG_TO_RAD));
				ofDrawCircle(location, radius);

				ofTranslate(location);
			}

			ofPopMatrix();
		}
	}
}

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

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

#include "ofApp.h"

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

void ofApp::setup() {

ofSetFrameRate(60);

ofSetWindowTitle("openFrameworks");

ofBackground(239);

ofSetColor(39, 64);

ofNoFill();

ofSetCircleResolution(72);

ofSetLineWidth(0.2);

}

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

void ofApp::update() {

ofSeedRandom(39);

}

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

void ofApp::draw() {

for (int x = 210; x < ofGetWidth(); x += 300) {

for (int y = 210; y < ofGetHeight(); y += 300) {

ofPushMatrix();

ofTranslate(x, y);

int radius_start = 120;

int radius_span = 1;

auto noise_seed = ofRandom(1000);

ofDrawCircle(glm::vec2(), radius_start);

for (int radius = radius_start - radius_span; radius >= 0; radius -= radius_span) {

auto tmp_radius = radius_span;

auto deg = ofMap(ofNoise(noise_seed + radius * 0.005 - ofGetFrameNum() * 0.015), 0, 1, -720, 720);

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

ofDrawCircle(location, radius);

ofTranslate(location);

}

ofPopMatrix();

}

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

int main() {

ofSetupOpenGL(720, 720, OF_WINDOW);

ofRunApp(new ofApp());

}

[ Link ]
https://github.com/junkiyoshi/Insta20200816

[ほしいものリスト]
Amazon

[ Sponsor Link ]

2020年8月14日2020年8月14日

Drop a drop. Draw by openFrameworks

[ Video ]

[ About ]
Drop a drop.

[ Source ]

#pragma once
#include "ofMain.h"
#include "ofxBox2d.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) {}

	ofxBox2d box2d;
	float radius;
	vector<shared_ptr<ofxBox2dCircle>> circle_list;
	vector<vector<glm::vec2>> log_list;
	vector<float> life_list;
};

#pragma once

#include "ofMain.h"

#include "ofxBox2d.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) {}

ofxBox2d box2d;

float radius;

vector<shared_ptr<ofxBox2dCircle>> circle_list;

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

vector<float> life_list;

};

#include "ofApp.h"

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

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

	ofBackground(239);
	ofSetColor(39);

	this->box2d.init();
	this->box2d.setGravity(0, 50);
	this->box2d.createBounds();
	this->box2d.setFPS(60);
	this->box2d.registerGrabbing();

	this->radius = 8;
}

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

	if (ofGetFrameNum() % 8 == 0) {

		auto circle = make_shared<ofxBox2dCircle>();
		circle->setPhysics(0.5, 0.83, 0.1);
		circle->setup(this->box2d.getWorld(), ofRandom(10, ofGetWidth() - 10), 10, this->radius);
		this->circle_list.push_back(circle);

		vector<glm::vec2> log;
		this->log_list.push_back(log);
		this->life_list.push_back(255);
	}


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

		for (int j = i + 1; j < this->circle_list.size(); j++) {

			float distance = this->circle_list[i]->getPosition().distance(this->circle_list[j]->getPosition());
			if (distance < this->radius * 4) {

				this->circle_list[i]->addForce(this->circle_list[i]->getPosition() - this->circle_list[j]->getPosition(), ofMap(distance, this->radius, this->radius * 4, 5, 0.02));
				this->circle_list[j]->addForce(this->circle_list[j]->getPosition() - this->circle_list[i]->getPosition(), ofMap(distance, this->radius, this->radius * 4, 5, 0.02));
			}
		}
	}

	this->box2d.update();

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

		this->log_list[i].push_back(glm::vec2(this->circle_list[i]->getPosition().x, this->circle_list[i]->getPosition().y));
		while (this->log_list[i].size() > 15) {

			this->log_list[i].erase(this->log_list[i].begin());
		}

		this->life_list[i] -= 1;
		if (this->life_list[i] < 0) {

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

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

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

		if (this->log_list[i].size() < 2) continue;

		ofMesh mesh;
		vector<glm::vec3> right, left, frame;
		glm::vec3 last_location;
		float last_theta;

		for (int k = 0; k < this->log_list[i].size() - 1; k++) {

			auto location = glm::vec3(this->log_list[i][k], 0);
			auto next = glm::vec3(this->log_list[i][k + 1], 0);

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

			right.push_back(location + glm::vec3(ofMap(k, 0, this->log_list[i].size(), 0.1, 8) * cos(theta + PI * 0.5), ofMap(k, 0, this->log_list[i].size(), 0.1, 8) * sin(theta + PI * 0.5), 0));
			left.push_back(location + glm::vec3(ofMap(k, 0, this->log_list[i].size(), 0.1, 8) * cos(theta - PI * 0.5), ofMap(k, 0, this->log_list[i].size(), 0.1, 8) * sin(theta - PI * 0.5), 0));

			last_location = location;
			last_theta = theta;
		}

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

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

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

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

		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(8 * cos(theta), 8 * sin(theta), 0));
			frame.push_back(last_location + glm::vec3(8 * cos(theta), 8 * sin(theta), 0));
		}

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

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

		this->life_list[i] > 128 ? ofSetColor(39) : ofSetColor(39, ofMap(this->life_list[i], 0, 128, 0, 255));
		mesh.draw();
	}
}

//--------------------------------------------------------------
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(39);

this->box2d.init();

this->box2d.setGravity(0, 50);

this->box2d.createBounds();

this->box2d.setFPS(60);

this->box2d.registerGrabbing();

this->radius = 8;

}

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

void ofApp::update() {

if (ofGetFrameNum() % 8 == 0) {

auto circle = make_shared<ofxBox2dCircle>();

circle->setPhysics(0.5, 0.83, 0.1);

circle->setup(this->box2d.getWorld(), ofRandom(10, ofGetWidth() - 10), 10, this->radius);

this->circle_list.push_back(circle);

vector<glm::vec2> log;

this->log_list.push_back(log);

this->life_list.push_back(255);

}

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

for (int j = i + 1; j < this->circle_list.size(); j++) {

float distance = this->circle_list[i]->getPosition().distance(this->circle_list[j]->getPosition());

if (distance < this->radius * 4) {

this->circle_list[i]->addForce(this->circle_list[i]->getPosition() - this->circle_list[j]->getPosition(), ofMap(distance, this->radius, this->radius * 4, 5, 0.02));

this->circle_list[j]->addForce(this->circle_list[j]->getPosition() - this->circle_list[i]->getPosition(), ofMap(distance, this->radius, this->radius * 4, 5, 0.02));

}

this->box2d.update();

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

this->log_list[i].push_back(glm::vec2(this->circle_list[i]->getPosition().x, this->circle_list[i]->getPosition().y));

while (this->log_list[i].size() > 15) {

this->log_list[i].erase(this->log_list[i].begin());

}

this->life_list[i] -= 1;

if (this->life_list[i] < 0) {

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

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

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

}

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

void ofApp::draw() {

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

if (this->log_list[i].size() < 2) continue;

ofMesh mesh;

vector<glm::vec3> right, left, frame;

glm::vec3 last_location;

float last_theta;

for (int k = 0; k < this->log_list[i].size() - 1; k++) {

auto location = glm::vec3(this->log_list[i][k], 0);

auto next = glm::vec3(this->log_list[i][k + 1], 0);

auto direction = next - location;

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

right.push_back(location + glm::vec3(ofMap(k, 0, this->log_list[i].size(), 0.1, 8) * cos(theta + PI * 0.5), ofMap(k, 0, this->log_list[i].size(), 0.1, 8) * sin(theta + PI * 0.5), 0));

left.push_back(location + glm::vec3(ofMap(k, 0, this->log_list[i].size(), 0.1, 8) * cos(theta - PI * 0.5), ofMap(k, 0, this->log_list[i].size(), 0.1, 8) * sin(theta - PI * 0.5), 0));

last_location = location;

last_theta = theta;

}

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

mesh.addVertex(left[k]);

mesh.addVertex(right[k]);

}

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

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

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

}

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(8 * cos(theta), 8 * sin(theta), 0));

frame.push_back(last_location + glm::vec3(8 * cos(theta), 8 * sin(theta), 0));

}

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

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

}

this->life_list[i] > 128 ? ofSetColor(39) : ofSetColor(39, ofMap(this->life_list[i], 0, 128, 0, 255));

mesh.draw();

}

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

int main() {

ofSetupOpenGL(720, 720, OF_WINDOW);

ofRunApp(new ofApp());

}

[ Link ]
https://github.com/junkiyoshi/Insta20200814/

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