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一定周期でParticle同士が、お互いに引き合う力・突き放す力が入れ替わります。
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#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) {} int direction; ofxBox2d box2d; vector<shared_ptr<ofxBox2dCircle>> circles; vector<ofColor> circles_color; }; |
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#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 = 12; 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); ofColor circle_color; circle_color.setHsb(ofRandom(255), 239, 239); this->circles_color.push_back(circle_color); } this->direction = 1; } //-------------------------------------------------------------- void ofApp::update() { // Change Power Direction if (ofGetFrameNum() % 300 == 0) { this->direction *= -1; } // Circles Compute Power for (int i = 0; i < this->circles.size(); i++) { for (int j = i + 1; j < this->circles.size(); j++) { float distance = this->circles[i]->getPosition().distance(this->circles[j]->getPosition()); if (distance < 80) { this->circles[i]->addForce(this->circles[i]->getPosition() - this->circles[j]->getPosition(), 0.75 * this->direction); this->circles[j]->addForce(this->circles[j]->getPosition() - this->circles[i]->getPosition(), 0.75 * this->direction); } } } // 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(); ofSetColor(this->circles_color[i]); 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()); } |