ofxBox2d – ページ 9 – プログラミング de 落描き

2018年5月10日2018年5月15日

力場によって動くParticle openFrameworks Box2d

[ Video ]

[ About ]
画面内の4カ所に力場が存在しており、Particleは力場に引っ張られて動いています。また、Particleのスピードにより尻尾のようなものを生えるようにしました。

[ 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;
	int force_field_radius;
	vector<shared_ptr<ofxBox2dCircle>> circles;
	vector<ofPoint> force_fields;
};

#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;

int force_field_radius;

vector<shared_ptr<ofxBox2dCircle>> circles;

vector<ofPoint> force_fields;

};

#include "ofApp.h"

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

	ofSetFrameRate(60);
	ofBackground(239);
	ofSetWindowTitle("Insta");

	ofSetColor(39);

	// Initialize ofxBox2d
	this->box2d.init();
	this->box2d.setGravity(0, 0);
	this->box2d.createBounds();
	this->box2d.setFPS(60);
	this->box2d.registerGrabbing();

	// Add Circle
	for (int i = 0; i < 255; i++) {

		float radius = 10;
		auto circle = make_shared<ofxBox2dCircle>();
		circle->setPhysics(1.0, 0.63, 0.1);
		circle->setup(this->box2d.getWorld(), ofRandom(ofGetWidth() / 2), ofRandom(ofGetHeight() / 2), radius);

		this->circles.push_back(circle);
	}

	// Add Field of Force
	this->force_fields.push_back(ofPoint(ofGetWidth() / 4, ofGetHeight() / 4));
	this->force_fields.push_back(ofPoint(ofGetWidth() / 4 * 3, ofGetHeight() / 4));
	this->force_fields.push_back(ofPoint(ofGetWidth() / 4 * 3, ofGetHeight() / 4 * 3));
	this->force_fields.push_back(ofPoint(ofGetWidth() / 4, ofGetHeight() / 4 * 3));

	this->force_field_radius = 150;
}

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

	// Field of Force
	for (int i = 0; i < this->circles.size(); i++) {

		shared_ptr<ofxBox2dCircle> circle = this->circles[i];
		ofPoint point = circle->getPosition();
		for (int field_index = 0; field_index < this->force_fields.size(); field_index++) {

			float distance = point.distance(this->force_fields[field_index]);
			if (distance < this->force_field_radius) {

				ofPoint p = ofPoint(this->force_field_radius * cos((field_index * 90 + 10) * DEG_TO_RAD), this->force_field_radius * sin((field_index * 90 + 10) * DEG_TO_RAD));
				circle->addForce(p, ofMap(distance, 0, this->force_field_radius, 0.1, 0.01));
			}
		}
	}

	// Compute box2d
	this->box2d.update();
}


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

	// Draw Circles
	for (int i = 0; i < this->circles.size(); i++) {

		float radius = this->circles[i]->getRadius();
		ofPoint point = this->circles[i]->getPosition();
		ofPoint velocity = this->circles[i]->getVelocity();

		ofPushMatrix();
		ofTranslate(point);

		if (velocity.length() < radius) {

			ofDrawCircle(ofPoint(), radius);
		}
		else {

			float velocity_deg = atan2f(velocity.y, velocity.x) * RAD_TO_DEG + 180;
			ofBeginShape();
			for (int deg = velocity_deg + 90; deg < velocity_deg + 270; deg++) {

				ofVertex(radius * cos(deg * DEG_TO_RAD), radius * sin(deg * DEG_TO_RAD));
			}
			ofVertex(-velocity * 2);
			ofEndShape(true);
		}

		ofPopMatrix();
	}
}

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

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

100

101

#include "ofApp.h"

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

void ofApp::setup() {

ofSetFrameRate(60);

ofBackground(239);

ofSetWindowTitle("Insta");

ofSetColor(39);

// Initialize ofxBox2d

this->box2d.init();

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

this->box2d.createBounds();

this->box2d.setFPS(60);

this->box2d.registerGrabbing();

// Add Circle

for (int i = 0; i < 255; i++) {

float radius = 10;

auto circle = make_shared<ofxBox2dCircle>();

circle->setPhysics(1.0, 0.63, 0.1);

circle->setup(this->box2d.getWorld(), ofRandom(ofGetWidth() / 2), ofRandom(ofGetHeight() / 2), radius);

this->circles.push_back(circle);

}

// Add Field of Force

this->force_fields.push_back(ofPoint(ofGetWidth() / 4, ofGetHeight() / 4));

this->force_fields.push_back(ofPoint(ofGetWidth() / 4 * 3, ofGetHeight() / 4));

this->force_fields.push_back(ofPoint(ofGetWidth() / 4 * 3, ofGetHeight() / 4 * 3));

this->force_fields.push_back(ofPoint(ofGetWidth() / 4, ofGetHeight() / 4 * 3));

this->force_field_radius = 150;

}

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

void ofApp::update() {

// Field of Force

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

shared_ptr<ofxBox2dCircle> circle = this->circles[i];

ofPoint point = circle->getPosition();

for (int field_index = 0; field_index < this->force_fields.size(); field_index++) {

float distance = point.distance(this->force_fields[field_index]);

if (distance < this->force_field_radius) {

ofPoint p = ofPoint(this->force_field_radius * cos((field_index * 90 + 10) * DEG_TO_RAD), this->force_field_radius * sin((field_index * 90 + 10) * DEG_TO_RAD));

circle->addForce(p, ofMap(distance, 0, this->force_field_radius, 0.1, 0.01));

}

// Compute box2d

this->box2d.update();

}

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

void ofApp::draw() {

// Draw Circles

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

float radius = this->circles[i]->getRadius();

ofPoint point = this->circles[i]->getPosition();

ofPoint velocity = this->circles[i]->getVelocity();

ofPushMatrix();

ofTranslate(point);

if (velocity.length() < radius) {

ofDrawCircle(ofPoint(), radius);

}

else {

float velocity_deg = atan2f(velocity.y, velocity.x) * RAD_TO_DEG + 180;

ofBeginShape();

for (int deg = velocity_deg + 90; deg < velocity_deg + 270; deg++) {

ofVertex(radius * cos(deg * DEG_TO_RAD), radius * sin(deg * DEG_TO_RAD));

}

ofVertex(-velocity * 2);

ofEndShape(true);

}

ofPopMatrix();

}

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

int main() {

ofSetupOpenGL(720, 720, OF_WINDOW);

ofRunApp(new ofApp());

}

[ Link ]
https://github.com/junkiyoshi/Insta20180510

[ほしいものリスト]
Amazon

[ Sponsor Link ]

2018年5月9日2018年5月9日

中央に力場 openFrameworks ofxBox2d

[ Video ]

[ About ]
ofxBox2dがopenFramworks0.10.0に、既に対応しているようだったので、新しい環境で使ってみました。ofxBox2dの環境構築については、Qiita記事を書きましたので、下記からご参照下さい。

openFrameworks0.10.0でofxBox2dを動かす(Windows)
https://qiita.com/junkiyoshi/items/68e602568a0c94840bec

今回は重力(x, y)を、それぞれ0として無重力にする代わりに、中央にフレーム番号と連動して変動する力場を作ってみました。Circle自身は移動する力を持っていませんが、力場から作用する力に引っ張られて飛び出していきます。

[ 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;
	vector<pair<shared_ptr<ofxBox2dCircle>, ofColor>> circles;
	int force_field_radius;
};

#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;

vector<pair<shared_ptr<ofxBox2dCircle>, ofColor>> circles;

int force_field_radius;

};

#include "ofApp.h"

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

	ofSetFrameRate(60);
	ofBackground(239);
	ofSetWindowTitle("Insta");

	// Initialize ofxBox2d
	this->box2d.init();
    this->box2d.setGravity(0, 0);
	this->box2d.createBounds();
	this->box2d.setFPS(60);
	this->box2d.registerGrabbing();

	// Add Circle
	for (int i = 0; i < 256; i++) {

		float radius = ofRandom(8.0, 15.0);
		auto circle = make_shared<ofxBox2dCircle>();
		circle->setPhysics(1.0, 0.63, 0.1);
		circle->setup(this->box2d.getWorld(), ofRandom(ofGetWidth()), ofRandom(ofGetHeight()), radius);

		ofColor color;
		color.setHsb(ofRandom(255), 239, 239);

		this->circles.push_back(make_pair(circle, color));
	}

	this->force_field_radius = 200;
}

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

	// Field of Force on Center
	for (int i = 0; i < this->circles.size(); i++) {

		shared_ptr<ofxBox2dCircle> circle = get<0>(this->circles[i]);
		ofPoint point = get<0>(this->circles[i])->getPosition();

		float distance = point.distance(ofPoint(ofGetWidth() / 2, ofGetHeight() / 2));
		if(distance < this->force_field_radius) {

			ofPoint p = ofPoint(this->force_field_radius * cos(ofGetFrameNum() * DEG_TO_RAD), this->force_field_radius * sin(ofGetFrameNum() * DEG_TO_RAD));
			circle->addForce(p, ofMap(distance, 0, 200, 10, 1));
		}
	}

	// Compute box2d
	this->box2d.update();
}


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

	// Draw Filed of Force
	ofPushMatrix();
	ofTranslate(ofGetWidth() / 2, ofGetHeight() / 2);

	ofNoFill();
	ofSetColor(39);
	ofSetLineWidth(0.5);
	ofBeginShape();
	for (int deg = 0; deg < 360; deg += 1) {

		ofVertex(this->force_field_radius * cos(deg * DEG_TO_RAD), this->force_field_radius * sin(deg * DEG_TO_RAD));
	}
	ofEndShape(true);

	ofFill();
	ofBeginShape();
	for (int deg = ofGetFrameNum(); deg < ofGetFrameNum() + 360; deg += 120) {

		ofVertex(this->force_field_radius * cos(deg * DEG_TO_RAD), this->force_field_radius * sin(deg * DEG_TO_RAD));
	}
	ofEndShape(true);

	ofPopMatrix();

	// Draw Circles
	ofSetLineWidth(3);
	for (int i = 0; i < this->circles.size(); i++) {

		ofSetColor(get<1>(this->circles[i]));
		float radius = get<0>(this->circles[i])->getRadius();
		ofPoint point = get<0>(this->circles[i])->getPosition();

		ofDrawCircle(point, radius);
		ofDrawLine(point, point - get<0>(this->circles[i])->getVelocity());
	}
}

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

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

100

101

#include "ofApp.h"

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

void ofApp::setup() {

ofSetFrameRate(60);

ofBackground(239);

ofSetWindowTitle("Insta");

// Initialize ofxBox2d

this->box2d.init();

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

this->box2d.createBounds();

this->box2d.setFPS(60);

this->box2d.registerGrabbing();

// Add Circle

for (int i = 0; i < 256; i++) {

float radius = ofRandom(8.0, 15.0);

auto circle = make_shared<ofxBox2dCircle>();

circle->setPhysics(1.0, 0.63, 0.1);

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

ofColor color;

color.setHsb(ofRandom(255), 239, 239);

this->circles.push_back(make_pair(circle, color));

}

this->force_field_radius = 200;

}

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

void ofApp::update() {

// Field of Force on Center

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

shared_ptr<ofxBox2dCircle> circle = get<0>(this->circles[i]);

ofPoint point = get<0>(this->circles[i])->getPosition();

float distance = point.distance(ofPoint(ofGetWidth() / 2, ofGetHeight() / 2));

if(distance < this->force_field_radius) {

ofPoint p = ofPoint(this->force_field_radius * cos(ofGetFrameNum() * DEG_TO_RAD), this->force_field_radius * sin(ofGetFrameNum() * DEG_TO_RAD));

circle->addForce(p, ofMap(distance, 0, 200, 10, 1));

}

// Compute box2d

this->box2d.update();

}

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

void ofApp::draw() {

// Draw Filed of Force

ofPushMatrix();

ofTranslate(ofGetWidth() / 2, ofGetHeight() / 2);

ofNoFill();

ofSetColor(39);

ofSetLineWidth(0.5);

ofBeginShape();

for (int deg = 0; deg < 360; deg += 1) {

ofVertex(this->force_field_radius * cos(deg * DEG_TO_RAD), this->force_field_radius * sin(deg * DEG_TO_RAD));

}

ofEndShape(true);

ofFill();

ofBeginShape();

for (int deg = ofGetFrameNum(); deg < ofGetFrameNum() + 360; deg += 120) {

ofVertex(this->force_field_radius * cos(deg * DEG_TO_RAD), this->force_field_radius * sin(deg * DEG_TO_RAD));

}

ofEndShape(true);

ofPopMatrix();

// Draw Circles

ofSetLineWidth(3);

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

ofSetColor(get<1>(this->circles[i]));

float radius = get<0>(this->circles[i])->getRadius();

ofPoint point = get<0>(this->circles[i])->getPosition();

ofDrawCircle(point, radius);

ofDrawLine(point, point - get<0>(this->circles[i])->getVelocity());

}

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

int main() {

ofSetupOpenGL(720, 720, OF_WINDOW);

ofRunApp(new ofApp());

}

[ Link ]
https://github.com/junkiyoshi/insta20180509

[ほしいものリスト]
Amazon

[ Sponsor Link ]

2017年12月18日2017年12月15日

Insta20171217

[ Video ]

[ About ]
昨日の花火を近いParticle同士で図形を作るようにしました。
Glass fireworks.

[ Source ]

#pragma once
#include "ofMain.h"
#include "ofFbo.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;

	ofFbo fbo;

	vector<shared_ptr<ofxBox2dCircle>> circles;
	vector<float> circles_size;
	vector<ofColor> circles_color;
	vector<float> circles_life;

};

#pragma once

#include "ofMain.h"

#include "ofFbo.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;

ofFbo fbo;

vector<shared_ptr<ofxBox2dCircle>> circles;

vector<float> circles_size;

vector<ofColor> circles_color;

vector<float> circles_life;

};

#include "ofApp.h"

//--------------------------------------------------------------
void ofApp::setup() {
	ofSetFrameRate(30);
	ofBackground(0);
	ofSetWindowTitle("Insta");

	ofEnableBlendMode(ofBlendMode::OF_BLENDMODE_ADD);

	this->box2d.init();
	this->box2d.setGravity(0, 15);
	this->box2d.createBounds();
	this->box2d.setFPS(30);
	this->box2d.registerGrabbing();

	this->fbo.allocate(ofGetWidth(), ofGetHeight());

}

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

	for (int i = this->circles.size() - 1; i > -1; i--) {
		this->circles_life[i] -= 3.5;

		if (this->circles_life[i] < 0) {
			this->circles[i].get()->destroy();
			this->circles.erase(this->circles.begin() + i);
			this->circles_life.erase(this->circles_life.begin() + i);
			this->circles_color.erase(this->circles_color.begin() + i);
		}
	}

	this->box2d.update();

	this->fbo.begin();
	ofClear(0);

	for (int i = 0; i < this->circles.size(); i++) {
		vector<ofVec2f> near_point;

		for (int j = i; j < this->circles.size(); j++) {
			float distance = this->circles[i].get()->getPosition().distanceSquared(this->circles[j].get()->getPosition());
			if (distance < 50 * 50) {
				near_point.push_back(this->circles[j].get()->getPosition());
			}
		}

		ofSetColor(this->circles_color[i], 192);
		if (near_point.size() > 2) {
			ofBeginShape();
			for (int i = 0; i < near_point.size(); i++) {
				ofVertex(near_point[i].x, near_point[i].y);
			}
			ofEndShape(true);
		}
		else {
			continue;
		}

	}

	this->fbo.end();
}

//--------------------------------------------------------------
void ofApp::draw() {
	this->fbo.draw(0, 0);
}

//--------------------------------------------------------------
void ofApp::mousePressed(int x, int y, int button) {
	float radius = 10;
	for (int i = 0; i < 5; i++) {
		float color_value = ofRandom(256);
		for (int deg = 0; deg < 360; deg += 10) {
			float tmp_x = radius * cos(deg * DEG_TO_RAD);
			float tmp_y = radius * sin(deg * DEG_TO_RAD);

			this->circles.push_back(shared_ptr<ofxBox2dCircle>(new ofxBox2dCircle));
			this->circles.back().get()->setPhysics(3.0, 0.5, 0.1);
			this->circles.back().get()->setup(this->box2d.getWorld(), x + tmp_x, y + tmp_y, 4);
			this->circles.back().get()->addForce(ofVec2f(tmp_x, tmp_y), 6.0);

			ofColor circle_color;
			circle_color.setHsb(color_value, 255, 255);
			this->circles_color.push_back(circle_color);

			this->circles_life.push_back(255);
		}

		radius += 3;
	}
}

//--------------------------------------------------------------
int main() {
	ofSetupOpenGL(720, 720, OF_WINDOW);
	ofRunApp(new ofApp());
}

100

101

#include "ofApp.h"

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

void ofApp::setup() {

ofSetFrameRate(30);

ofBackground(0);

ofSetWindowTitle("Insta");

ofEnableBlendMode(ofBlendMode::OF_BLENDMODE_ADD);

this->box2d.init();

this->box2d.setGravity(0, 15);

this->box2d.createBounds();

this->box2d.setFPS(30);

this->box2d.registerGrabbing();

this->fbo.allocate(ofGetWidth(), ofGetHeight());

}

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

void ofApp::update() {

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

this->circles_life[i] -= 3.5;

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

this->circles[i].get()->destroy();

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

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

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

}

this->box2d.update();

this->fbo.begin();

ofClear(0);

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

vector<ofVec2f> near_point;

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

float distance = this->circles[i].get()->getPosition().distanceSquared(this->circles[j].get()->getPosition());

if (distance < 50 * 50) {

near_point.push_back(this->circles[j].get()->getPosition());

}

ofSetColor(this->circles_color[i], 192);

if (near_point.size() > 2) {

ofBeginShape();

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

ofVertex(near_point[i].x, near_point[i].y);

}

ofEndShape(true);

}

else {

continue;

}

this->fbo.end();

}

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

void ofApp::draw() {

this->fbo.draw(0, 0);

}

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

void ofApp::mousePressed(int x, int y, int button) {

float radius = 10;

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

float color_value = ofRandom(256);

for (int deg = 0; deg < 360; deg += 10) {

float tmp_x = radius * cos(deg * DEG_TO_RAD);

float tmp_y = radius * sin(deg * DEG_TO_RAD);

this->circles.push_back(shared_ptr<ofxBox2dCircle>(new ofxBox2dCircle));

this->circles.back().get()->setPhysics(3.0, 0.5, 0.1);

this->circles.back().get()->setup(this->box2d.getWorld(), x + tmp_x, y + tmp_y, 4);

this->circles.back().get()->addForce(ofVec2f(tmp_x, tmp_y), 6.0);

ofColor circle_color;

circle_color.setHsb(color_value, 255, 255);

this->circles_color.push_back(circle_color);

this->circles_life.push_back(255);

}

radius += 3;

}

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

int main() {

ofSetupOpenGL(720, 720, OF_WINDOW);

ofRunApp(new ofApp());

}

[ Link ]
https://github.com/junkiyoshi/Insta20171217

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