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Ribbon and Box2d.
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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) {}; ofEasyCam cam; vector<ofColor> base_color_list; ofxBox2d box2d; vector<shared_ptr<ofxBox2dCircle>> circle_list; vector<float> radius_list; vector<vector<glm::vec2>> log_list; vector<ofColor> color_list; vector<float> life_list; vector<float> life_speed_list; }; |
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#include "ofApp.h" //-------------------------------------------------------------- void ofApp::setup() { ofSetFrameRate(60); ofSetWindowTitle("openFrameworks"); ofBackground(239); ofSetLineWidth(2); ofSetCircleResolution(60); ofColor color; vector<int> hex_list = { 0xef476f, 0xffd166, 0x06d6a0, 0x118ab2, 0x073b4c }; for (auto hex : hex_list) { color.setHex(hex); this->base_color_list.push_back(color); } this->box2d.init(); this->box2d.setGravity(0, 50); this->box2d.createBounds(); this->box2d.setFPS(60); this->box2d.registerGrabbing(); } //-------------------------------------------------------------- void ofApp::update() { for (int i = this->circle_list.size() - 1; i > -1; i--) { this->life_list[i] -= this->life_speed_list[i]; if (this->life_list[i] < 0) { this->circle_list.erase(this->circle_list.begin() + i); this->radius_list.erase(this->radius_list.begin() + i); this->log_list.erase(this->log_list.begin() + i); this->color_list.erase(this->color_list.begin() + i); this->life_list.erase(this->life_list.begin() + i); this->life_speed_list.erase(this->life_speed_list.begin() + i); } } if (ofGetFrameNum() % 3 == 0) { auto radius = 10; auto circle = make_shared<ofxBox2dCircle>(); circle->setPhysics(0.5, 0.83, 0.3); circle->setup(this->box2d.getWorld(), ofRandom(radius, ofGetWidth() - radius), radius, radius); circle->setRotation(ofRandom(360)); this->circle_list.push_back(circle); this->radius_list.push_back(radius); vector<glm::vec2> log; this->log_list.push_back(log); int color_index = ofRandom(this->base_color_list.size()); this->color_list.push_back(this->base_color_list[color_index]); this->life_list.push_back(128); this->life_speed_list.push_back(ofRandom(0.5, 1.2)); } this->box2d.update(); for (int i = 0; i < this->circle_list.size(); i++) { this->log_list[i].push_back(this->circle_list[i]->getPosition()); while (this->log_list[i].size() > 30) { this->log_list[i].erase(this->log_list[i].begin()); } } } //-------------------------------------------------------------- void ofApp::draw() { this->cam.begin(); ofRotateX(180); ofTranslate(ofGetWidth() * -0.5, ofGetHeight() * -0.5); for (int k = 0; k < this->circle_list.size(); k++) { auto log = this->log_list[k]; ofMesh mesh, frame; frame.setMode(ofPrimitiveMode::OF_PRIMITIVE_LINES); for (int i = 0; i < log.size(); i++) { auto right = glm::vec3(log[i], -15); auto left = glm::vec3(log[i], 15); mesh.addVertex(right); mesh.addVertex(left); frame.addVertex(right); frame.addVertex(left); if (i > 0) { mesh.addIndex(mesh.getNumVertices() - 1); mesh.addIndex(mesh.getNumVertices() - 2); mesh.addIndex(mesh.getNumVertices() - 4); mesh.addIndex(mesh.getNumVertices() - 1); mesh.addIndex(mesh.getNumVertices() - 3); mesh.addIndex(mesh.getNumVertices() - 4); frame.addIndex(frame.getNumVertices() - 1); frame.addIndex(frame.getNumVertices() - 3); frame.addIndex(frame.getNumVertices() - 2); frame.addIndex(frame.getNumVertices() - 4); } mesh.addColor(ofColor(this->color_list[k], ofMap(this->life_list[k], 128, 0, 255, 32))); mesh.addColor(ofColor(this->color_list[k], ofMap(this->life_list[k], 128, 0, 255, 32))); frame.addColor(ofColor(239)); frame.addColor(ofColor(239)); } frame.addIndex(0); frame.addIndex(1); frame.addIndex(frame.getNumVertices() - 1); frame.addIndex(frame.getNumVertices() - 2); mesh.draw(); frame.drawWireframe(); } this->cam.end(); } //-------------------------------------------------------------- int main() { ofSetupOpenGL(720, 720, OF_WINDOW); ofRunApp(new ofApp()); } |