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Drop a drop.
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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 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; }; |
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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()); } |