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導火線。
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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<float> seed_list; vector<glm::vec2> velocity_list; vector<ofColor> color_list; glm::vec2 make_point(int len, int param); }; |
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#include "ofApp.h" //-------------------------------------------------------------- void ofApp::setup() { ofSetFrameRate(25); ofSetWindowTitle("openframeworks"); ofBackground(0); ofNoFill(); ofEnableBlendMode(ofBlendMode::OF_BLENDMODE_ADD); } //-------------------------------------------------------------- void ofApp::update() { int base_radius = (ofGetFrameNum() * 2) % 420 + 60; for (int i = this->log_list.size() - 1; i >= 0; i--) { if (glm::length(this->log_list[i].back()) > 720) { this->log_list.erase(this->log_list.begin() + i); this->seed_list.erase(this->seed_list.begin() + i); this->velocity_list.erase(this->velocity_list.begin() + i); this->color_list.erase(this->color_list.begin() + i); continue; } auto feature = this->velocity_list[i] * 80; auto deg = ofMap(ofNoise(this->seed_list[i], ofGetFrameNum() * 0.015), 0, 1, 0, 360); feature += glm::vec2(30 * cos(deg * DEG_TO_RAD), 30 * sin(deg * DEG_TO_RAD)); auto next = this->log_list[i].back() + glm::normalize(feature) * 15; this->log_list[i].push_back(next); while (this->log_list[i].size() > 15) { this->log_list[i].erase(this->log_list[i].begin()); } } ofColor color; for (int i = 0; i < 4; i++) { int param = ofGetFrameNum(); int next_param = param + 1; int len = ofRandom(345, 355); auto location = this->make_point(len, param); auto next = this->make_point(len, next_param); vector<glm::vec2> log; log.push_back(location); this->log_list.push_back(log); this->seed_list.push_back(ofMap(ofNoise(location * 0.001), 0, 1, 0, 1000)); this->velocity_list.push_back(glm::normalize(location - next)); color.setHsb(ofRandom(0, 30), 200, 255); this->color_list.push_back(color); } } //-------------------------------------------------------------- void ofApp::draw() { ofTranslate(ofGetWindowSize() * 0.5); ofSetLineWidth(1.5); for (int i = 0; i < this->log_list.size(); i++) { ofSetColor(this->color_list[i]); ofBeginShape(); ofVertices(this->log_list[i]); ofEndShape(); } ofSetColor(128); ofSetLineWidth(0.5); ofDrawRectangle(-175, -175, 350, 350); /* int start = 150; if (ofGetFrameNum() > start) { ostringstream os; os << setw(4) << 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); } } */ } //-------------------------------------------------------------- glm::vec2 ofApp::make_point(int len, int param) { param = param % 100; if (param < 25) { return glm::vec2(ofMap(param, 0, 25, -len * 0.5, len * 0.5), -len * 0.5); } else if (param < 50) { return glm::vec2(len * 0.5, ofMap(param, 25, 50, -len * 0.5, len * 0.5)); } else if (param < 75) { return glm::vec2(ofMap(param, 50, 75, len * 0.5, -len * 0.5), len * 0.5); } else { return glm::vec2(-len * 0.5, ofMap(param, 75, 100, len * 0.5, -len * 0.5)); } } //-------------------------------------------------------------- int main() { ofSetupOpenGL(720, 720, OF_WINDOW); ofRunApp(new ofApp()); } |