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対称ランダムウォーク。
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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) {}; }; |
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#include "ofApp.h" //-------------------------------------------------------------- void ofApp::setup() { ofSetFrameRate(30); ofSetWindowTitle("openframeworks"); ofBackground(239); ofSetLineWidth(3); } //-------------------------------------------------------------- void ofApp::update() { ofSeedRandom(39); } //-------------------------------------------------------------- void ofApp::draw() { ofTranslate(ofGetWidth() * 0.5, ofGetHeight() * 0.5); auto noise_seed = glm::vec2(ofRandom(1000), ofRandom(1000)); for (int k = 0; k < 1; k++) { ofMesh mesh; vector<glm::vec3> right, left, frame; glm::vec3 last_location; float last_theta; for (int i = 0; i < 24; i++) { auto radius = ofMap(ofNoise((ofGetFrameNum() + i + k * 10) * 0.04), 0, 1, 0, 380); auto next_radius = ofMap(ofNoise((ofGetFrameNum() + i + 1 + k * 10) * 0.04), 0, 1, 0, 380); auto deg = ofMap(ofNoise(k, (ofGetFrameNum() + i) * 0.0085), 0, 1, -180, 180); auto next_deg = ofMap(ofNoise(k, (ofGetFrameNum() + i + 1) * 0.0085), 0, 1, -180, 180); auto location = glm::vec3(radius * cos(deg * DEG_TO_RAD), radius * sin(deg * DEG_TO_RAD), 0); auto next = glm::vec3(next_radius * cos(next_deg * DEG_TO_RAD), next_radius * sin(next_deg * DEG_TO_RAD), 0); auto direction = next - location; auto theta = atan2(direction.y, direction.x); right.push_back(location + glm::vec3(ofMap(i, 0, 25, 0, 8) * cos(theta + PI * 0.5), ofMap(i, 0, 25, 0, 8) * sin(theta + PI * 0.5), 0)); left.push_back(location + glm::vec3(ofMap(i, 0, 25, 0, 8) * cos(theta - PI * 0.5), ofMap(i, 0, 25, 0, 8) * sin(theta - PI * 0.5), 0)); last_location = location; last_theta = theta; } for (int i = 0; i < right.size(); i++) { mesh.addVertex(left[i]); mesh.addVertex(right[i]); } for (int i = 0; i < mesh.getNumVertices() - 2; i += 2) { mesh.addIndex(i + 0); mesh.addIndex(i + 1); mesh.addIndex(i + 3); mesh.addIndex(i + 0); mesh.addIndex(i + 2); mesh.addIndex(i + 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 i = index; i < mesh.getNumVertices() - 1; i++) { mesh.addIndex(index); mesh.addIndex(i + 0); mesh.addIndex(i + 1); } reverse(right.begin(), right.end()); ofColor color; for (int i = 0; i < 20; i++) { ofRotate(18); ofSetColor(255); mesh.draw(); color.setHsb(ofMap(i, 0, 20, 0, 255), 150, 255); ofSetColor(color); ofNoFill(); ofBeginShape(); ofVertices(frame); ofVertices(right); ofVertices(left); ofEndShape(false); } } } //-------------------------------------------------------------- int main() { ofSetupOpenGL(720, 720, OF_WINDOW); ofRunApp(new ofApp()); } |