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radius = map(distance, 0, 30, size, 0).
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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(0); ofSetColor(255); ofSetLineWidth(3); ofSetCircleResolution(72); } //-------------------------------------------------------------- void ofApp::update() { ofSeedRandom(39); } //-------------------------------------------------------------- void ofApp::draw() { ofTranslate(ofGetWindowSize() * 0.5); auto radius = 250; auto target_deg = ofGetFrameNum() % 360; auto target_location = glm::vec2(radius * cos(target_deg * DEG_TO_RAD), radius * sin(target_deg * DEG_TO_RAD)); ofNoFill(); for (int i = 0; i < 40; i++) { auto random_radius = ofRandom(200, 300); auto random_deg = ofRandom(360); auto random_location = glm::vec2(random_radius * cos(random_deg * DEG_TO_RAD), random_radius * sin(random_deg * DEG_TO_RAD)); auto distance = glm::distance(random_location, target_location); auto size = ofMap(distance, 0, 30, 50, 0); ofDrawCircle(random_location, size); } ofFill(); ofDrawCircle(target_location, 8); } //-------------------------------------------------------------- int main() { ofSetupOpenGL(720, 720, OF_WINDOW); ofRunApp(new ofApp()); } |