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特定の角度範囲の円弧だけを描写する円を4隅に配置しました。
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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); ofBackground(39); ofSetWindowTitle("Insta"); ofSetLineWidth(3); } //-------------------------------------------------------------- void ofApp::update() { } //-------------------------------------------------------------- void ofApp::draw() { vector<ofPoint> points; points.push_back(ofPoint(0, 0)); points.push_back(ofPoint(ofGetWidth(), ofGetHeight())); points.push_back(ofPoint(0, ofGetHeight())); points.push_back(ofPoint(ofGetWidth(), 0)); int deg_span = 1; int color_start = 0; int color_end = 120; ofSetColor(239); for (int i = 0; i < points.size(); i++) { ofPushMatrix(); ofTranslate(points[i]); for (int radius = 150; radius <= 380; radius += 15) { int start_deg = i * 90; for (int deg = start_deg; deg < start_deg + 360; deg += deg_span) { int value = (ofGetFrameNum() * 2 + deg + radius) % 360; if (value > color_start && value < color_end) { ofPoint start = ofPoint(radius * cos(deg * DEG_TO_RAD), radius * sin(deg * DEG_TO_RAD)); ofPoint end = ofPoint(radius * cos((deg + deg_span) * DEG_TO_RAD), radius * sin((deg + deg_span) * DEG_TO_RAD)); ofDrawLine(start, end); } } } ofPopMatrix(); } } //-------------------------------------------------------------- int main() { ofSetupOpenGL(720, 720, OF_WINDOW); ofRunApp(new ofApp()); } |