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円の一部ズラし。ノイズ関数から得られる値に閾値を設けて、0.3より小さい、0.7より大きいときだけ動かしています
Circle is sliding.
[ Source ]
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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(60); ofSetWindowTitle("openFrameworks"); ofBackground(239); ofSetColor(39); ofNoFill(); ofSetLineWidth(1.5); } //-------------------------------------------------------------- void ofApp::update() { } //-------------------------------------------------------------- void ofApp::draw() { ofTranslate(ofGetWidth() * 0.5, ofGetHeight() * 0.5); auto radius_base = 250; auto len = 125; auto deg_span = 5; for (auto deg = 0; deg < 360; deg += deg_span) { auto noise_point = glm::vec2(radius_base * cos(deg * DEG_TO_RAD), radius_base * sin(deg * DEG_TO_RAD)); auto noise_value = ofNoise(noise_point.x * 0.01, noise_point.y * 0.01, ofGetFrameNum() * 0.01); auto radius = radius_base; if (noise_value > 0.7) { radius += ofMap(noise_value, 0.7, 1.0, 0, radius_base * 0.5); } if (noise_value < 0.3) { radius -= ofMap(noise_value, 0.0, 0.3, radius_base * 0.5, 0); } ofBeginShape(); ofVertex(glm::vec2(radius * cos((deg - deg_span * 0.5) * DEG_TO_RAD), radius * sin((deg - deg_span * 0.5) * DEG_TO_RAD))); ofVertex(glm::vec2(radius * cos((deg + deg_span * 0.5) * DEG_TO_RAD), radius * sin((deg + deg_span * 0.5) * DEG_TO_RAD))); ofVertex(glm::vec2((radius - len) * cos((deg + deg_span * 0.5) * DEG_TO_RAD), (radius - len) * sin((deg + deg_span * 0.5) * DEG_TO_RAD))); ofVertex(glm::vec2((radius - len) * cos((deg - deg_span * 0.5) * DEG_TO_RAD), (radius - len) * sin((deg - deg_span * 0.5) * DEG_TO_RAD))); ofEndShape(true); } } //-------------------------------------------------------------- int main() { ofSetupOpenGL(720, 720, OF_WINDOW); ofRunApp(new ofApp()); } |