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円を15度づつ分解して、それぞれで透過度を変えています。
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#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 mouseEntered(int x, int y) {} void mouseExited(int x, int y) {} 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); ofBackground(239); ofSetWindowTitle("Insta"); } //-------------------------------------------------------------- void ofApp::update() { } //-------------------------------------------------------------- void ofApp::draw() { ofTranslate(ofGetWidth() / 2, ofGetHeight() / 2); float radius = 325; int deg_span = 15; for (int deg = 0; deg < 360; deg += deg_span) { float noise_x = radius * cos((deg + deg_span / 2) * DEG_TO_RAD); float noise_y = radius * sin((deg + deg_span / 2) * DEG_TO_RAD); float noise_value = ofNoise(noise_x * 0.003, noise_y * 0.003, ofGetFrameNum() * 0.005); ofSetColor(39, 39, 239, noise_value * 255); ofBeginShape(); for (int tmp_deg = deg; tmp_deg <= deg + deg_span; tmp_deg++) { float x = radius * cos(tmp_deg * DEG_TO_RAD); float y = radius * sin(tmp_deg * DEG_TO_RAD); ofVertex(x, y); } ofVertex(0, 0); ofEndShape(true); } } //-------------------------------------------------------------- int main() { ofSetupOpenGL(720, 720, OF_WINDOW); ofRunApp(new ofApp()); } |