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昨日のProcessing勉強会で話題になったサンプルの応用例。辺ごとにgapの値を変えれば歪みました。
Octagon 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(0); ofSetColor(255); ofNoFill(); this->gon = 8; for (auto i = 0; i < this->gon; i++) { this->gap_list.push_back(0); } } //-------------------------------------------------------------- void ofApp::update() { ofSeedRandom(39); for (auto& gap : this->gap_list) { gap = ofMap(ofNoise(ofRandom(1000), ofGetFrameNum() * 0.002), 0, 1, 0.01, 0.3); } } //-------------------------------------------------------------- void ofApp::draw() { ofTranslate(ofGetWidth() * 0.5, ofGetHeight() * 0.5); auto radius = 350; int deg_span = 360 / this->gon; vector<glm::vec2> vertices; auto first = true; while(true) { if(first){ for (auto deg = 0; deg < 360; deg += deg_span) { vertices.push_back(glm::vec2(radius * cos(deg * DEG_TO_RAD), radius * sin(deg * DEG_TO_RAD))); } 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]); } vertices = tmp; } ofBeginShape(); ofVertices(vertices); ofEndShape(true); if (glm::distance(vertices[0], vertices[1]) < 1) { break; } } } //-------------------------------------------------------------- int main() { ofSetupOpenGL(720, 720, OF_WINDOW); ofRunApp(new ofApp()); } |