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正方形のらせんを見比べる。
Square spiral.
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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) {}; int gon; vector<float> gap_list; }; |
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#include "ofApp.h" //-------------------------------------------------------------- void ofApp::setup() { ofSetFrameRate(60); ofSetWindowTitle("openframeworks"); ofBackground(239); ofSetColor(39); ofSetLineWidth(1.5); ofNoFill(); } //-------------------------------------------------------------- void ofApp::update() { this->gon = 4; this->gon = 8; for (auto i = 0; i < this->gon; i++) { this->gap_list.push_back(0); } } //-------------------------------------------------------------- void ofApp::draw() { auto span = 144; auto radius = 95; int deg_span = 360 / 4; for (int x = span * 0.5; x < ofGetWidth(); x += span) { for (int y = span * 0.5; y < ofGetHeight(); y += span) { ofSeedRandom(x + ofGetWidth() * y); ofPushMatrix(); ofTranslate(x, y); for (auto& gap : this->gap_list) { gap = ofMap(ofNoise(ofRandom(1000), ofGetFrameNum() * 0.005), 0, 1, 0.001, 0.1); } vector<glm::vec2> vertices; auto first = true; for (int i = 0; i < 1000; i++) { if (first) { for (auto deg = 0 + 45; deg < 360 + 45; deg += deg_span) { vertices.push_back(glm::vec2(radius * cos(deg * DEG_TO_RAD), radius * sin(deg * DEG_TO_RAD))); } ofBeginShape(); ofVertices(vertices); ofEndShape(true); first = false; } else { vector<glm::vec2> tmp; for (auto k = 0; k < vertices.size(); k++) { tmp.push_back(vertices[k] + (vertices[(k + 1) % vertices.size()] - vertices[k]) * this->gap_list[k]); } for (auto k = 0; k < vertices.size(); k++) { ofDrawLine(vertices[k], tmp[k]); } vertices = tmp; } if (glm::distance(vertices[0], vertices[1]) < 1) { break; } } ofPopMatrix(); } } } //-------------------------------------------------------------- int main() { ofSetupOpenGL(720, 720, OF_WINDOW); ofRunApp(new ofApp()); } |