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流星群。
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#pragma once #include "ofMain.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) {}; vector<vector<glm::vec2>> log_list; vector<glm::vec2> velocity_list; vector<float> noise_seed_list; vector<ofColor> color_list; }; |
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#include "ofApp.h" //-------------------------------------------------------------- void ofApp::setup() { ofSetFrameRate(25); ofSetWindowTitle("openframeworks"); ofBackground(239); } //-------------------------------------------------------------- void ofApp::update() { ofColor color; for (int i = 0; i < 75; i++) { auto noise_location = glm::vec2( ofMap(ofNoise(39 + i * 1000, ofGetFrameNum() * 0.0015), 0, 1, -600, 600), ofMap(ofNoise(239 + i * 1000, ofGetFrameNum() * 0.0015), 0, 1, -600, 600)); noise_location = glm::length(noise_location) < 500 ? noise_location : glm::normalize(noise_location) * 500; auto next_noise_location = glm::vec2( ofMap(ofNoise(39 + i * 1000, (ofGetFrameNum() + 1) * 0.0015), 0, 1, -600, 600), ofMap(ofNoise(239 + i * 1000, (ofGetFrameNum() + 1) * 0.0015), 0, 1, -600, 600)); next_noise_location = glm::length(next_noise_location) < 500 ? next_noise_location : glm::normalize(next_noise_location) * 500; vector<glm::vec2> log; log.push_back(noise_location); this->log_list.push_back(log); auto deg = glm::atan(next_noise_location.y - noise_location.y, next_noise_location.x - noise_location.x) * RAD_TO_DEG + 180 + ofRandom(-15, 15); glm::vec2 velocity = glm::vec2(cos(deg * DEG_TO_RAD), sin(deg * DEG_TO_RAD)); this->velocity_list.push_back(velocity); this->noise_seed_list.push_back(ofRandom(1000)); color.setHsb(ofMap(i % 3, 0, 3, 0, 255), 200, 255); this->color_list.push_back(color); } for (int i = 0; i < this->log_list.size(); i++) { auto future = this->velocity_list[i] * 200; auto random_deg = ofMap(ofNoise(glm::vec2(this->noise_seed_list[i], ofGetFrameNum() * 0.01)), 0, 1, 0, 360); future += glm::vec2(50 * cos(random_deg * DEG_TO_RAD), 50 * sin(random_deg * DEG_TO_RAD)); auto next = this->log_list[i].back() + glm::normalize(future) * 3; next = glm::length(next) < 500 ? next : glm::normalize(next) * 500; this->log_list[i].push_back(next); if (this->log_list[i].size() > 30) { this->log_list.erase(this->log_list.begin() + i); this->velocity_list.erase(this->velocity_list.begin() + i); this->noise_seed_list.erase(this->noise_seed_list.begin() + i); this->color_list.erase(this->color_list.begin() + i); } } } //-------------------------------------------------------------- void ofApp::draw() { ofTranslate(ofGetWidth() * 0.5, ofGetHeight() * 0.5); for (int i = 0; i < this->log_list.size(); i++) { ofSetColor(this->color_list[i]); auto size = this->log_list[i].size() < 3 ? 12 : ofMap(this->log_list[i].size(), 3, 30, 12, 0); ofDrawCircle(this->log_list[i].back(), size); } for (int i = 0; i < this->log_list.size(); i++) { ofSetColor(39); auto size = this->log_list[i].size() < 3 ? 9 : ofMap(this->log_list[i].size(), 3, 30, 9, 0); ofDrawCircle(this->log_list[i].back(), size); } /* // ffmpeg -i img_%04d.jpg aaa.mp4 int start = 500; if (ofGetFrameNum() > start) { std::ostringstream os; os << std::setw(4) << std::setfill('0') << ofGetFrameNum() - start; ofImage image; image.grabScreen(0, 0, ofGetWidth(), ofGetHeight()); image.saveImage("image/cap/img_" + os.str() + ".jpg"); if (ofGetFrameNum() - start >= 25 * 20) { std::exit(1); } } */ } //-------------------------------------------------------------- int main() { ofSetupOpenGL(720, 720, OF_WINDOW); ofRunApp(new ofApp()); } |
[ Link ]
https://github.com/junkiyoshi/DoodleDeProgramming/tree/cc3bc03fe731f36cfe455f61c171ef778669a036