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#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 windowResized(int w, int h) {}; void dragEvent(ofDragInfo dragInfo) {}; void gotMessage(ofMessage msg) {}; float radius; ofxBox2d box2d; vector<shared_ptr<ofxBox2dCircle>> circles; vector<vector<glm::vec2>> log_list; }; |
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#include "ofApp.h" //-------------------------------------------------------------- void ofApp::setup() { ofSetFrameRate(60); ofSetWindowTitle("openFrameworks"); ofBackground(255); ofEnableDepthTest(); this->radius = 30; this->box2d.init(); this->box2d.setGravity(0, 0); this->box2d.createBounds(30, 30, ofGetWidth() - 60, ofGetHeight() - 60); this->box2d.setFPS(60); this->box2d.registerGrabbing(); for (int i = 0; i < 40; i++) { auto circle = make_shared<ofxBox2dCircle>(); circle->setPhysics(0.5, 0.63, 0.1); circle->setup(this->box2d.getWorld(), ofRandom(30, ofGetWidth() - 30), ofRandom(30, ofGetHeight() - 30), this->radius); this->circles.push_back(circle); vector<glm::vec2> log; this->log_list.push_back(log); } } //-------------------------------------------------------------- void ofApp::update() { ofSeedRandom(39); 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 < this->radius * 4) { this->circles[i]->addForce(this->circles[i]->getPosition() - this->circles[j]->getPosition(), ofMap(distance, this->radius, this->radius * 4, 1.6, 0.004)); this->circles[j]->addForce(this->circles[j]->getPosition() - this->circles[i]->getPosition(), ofMap(distance, this->radius, this->radius * 4, 1.6, 0.004)); } } } for (int i = 0; i < this->circles.size(); i++) { this->log_list[i].push_back(this->circles[i]->getPosition()); while (this->log_list[i].size() > 25) { this->log_list[i].erase(this->log_list[i].begin()); } } this->box2d.update(); } //-------------------------------------------------------------- void ofApp::draw() { auto threshold = 110; int head_size = 8; ofColor color; ofSetLineWidth(1); vector<glm::vec2> locations; for (int i = 0; i < this->circles.size(); i++) { glm::vec2 location = this->circles[i]->getPosition(); locations.push_back(location); auto hue = ofMap(i, 0, this->circles.size(), 0, 255); color.setHsb(hue, 255, 255); ofSetColor(color); 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, head_size) * cos(theta + PI * 0.5), ofMap(k, 0, this->log_list[i].size(), 0.1, head_size) * sin(theta + PI * 0.5), 0)); left.push_back(location + glm::vec3(ofMap(k, 0, this->log_list[i].size(), 0.1, head_size) * cos(theta - PI * 0.5), ofMap(k, 0, this->log_list[i].size(), 0.1, head_size) * 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); } auto tmp_head_size = ofMap(log_list[i].size() - 2, 0, log_list[i].size(), 0.1, 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(); ofFill(); ofDrawCircle(this->log_list[i].back(), 8); } ofSetColor(0); ofSetLineWidth(1); for (auto& location : locations) { int word_index = 0; for (auto& other : locations) { if (location == other) { continue; } auto distance = glm::distance(location, other); if (distance < threshold) { auto direction_rad = std::atan2(other.y - location.y, other.x - location.x); auto direction = direction_rad * RAD_TO_DEG; auto width = ofMap(distance, 0, threshold, 360, 0); ofPushMatrix(); ofTranslate(location); ofNoFill(); ofBeginShape(); for (auto deg = direction - width * 0.5; deg <= direction + width * 0.5; deg++) { ofVertex(radius * cos(deg * DEG_TO_RAD), radius * sin(deg * DEG_TO_RAD)); } ofEndShape(); ofDrawLine(glm::vec2(radius * cos(direction * DEG_TO_RAD), radius * sin(direction * DEG_TO_RAD)), (other - location) + glm::vec2(radius * cos((180 + direction) * DEG_TO_RAD), radius * sin((180 + direction) * DEG_TO_RAD))); ofPopMatrix(); } } } } //-------------------------------------------------------------- int main() { ofSetupOpenGL(720, 720, OF_WINDOW); ofRunApp(new ofApp()); } |