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Noise関数で半円の長さを決めながら描写しています。
加えて、それぞれの円の開始位置をRotate関数でずらしています。
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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 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) {}; ofEasyCam cam; }; |
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#include "ofApp.h" //-------------------------------------------------------------- void ofApp::setup() { ofSetFrameRate(30); ofBackground(0); ofSetWindowTitle("Insta"); } //-------------------------------------------------------------- void ofApp::update(){ } //-------------------------------------------------------------- void ofApp::draw() { this->cam.begin(); float radius = 50; float x, y; float rainbow_height = 30; ofColor color; for (int i = 0; i < 7; i++) { ofRotateZ(ofGetFrameNum() * 2); color.setHsb(216 - i * 35, 255, 255); ofSetColor(color); int deg_max = ofMap(ofNoise((ofGetFrameNum() + i) * 0.025), 0, 1, -180, 360 + 180); if (deg_max < 0) { deg_max = 0; } ofBeginShape(); for (int deg = 0; deg <= deg_max; deg += 1) { x = radius * cos(deg * DEG_TO_RAD); y = radius * sin(deg * DEG_TO_RAD); ofVertex(ofVec3f(x, y, 0)); } for (int deg = deg_max; deg >= 0; deg -= 1) { x = (radius + rainbow_height) * cos(deg * DEG_TO_RAD); y = (radius + rainbow_height) * sin(deg * DEG_TO_RAD); ofVertex(ofVec3f(x, y, 0)); } ofEndShape(); radius += rainbow_height + 5; } this->cam.end(); } //-------------------------------------------------------------- int main() { ofSetupOpenGL(720, 720, OF_WINDOW); ofRunApp(new ofApp()); } |