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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) {}; glm::vec2 make_point(float theta); vector<glm::vec2> location_list; vector<glm::vec2> directon_list; vector<float> size_list; vector<float> speed_list; vector<float> max_size_list; vector<float> deg_list; vector<ofColor> color_list; }; |
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#include "ofApp.h" //-------------------------------------------------------------- void ofApp::setup() { ofSetFrameRate(30); ofSetWindowTitle("openFrameworks"); ofBackground(255); //ofEnableBlendMode(ofBlendMode::OF_BLENDMODE_ADD); } //-------------------------------------------------------------- void ofApp::update() { for (int i = this->location_list.size() - 1; i >= 0; i--) { this->size_list[i] += this->speed_list[i]; this->location_list[i] += this->directon_list[i]; if (this->size_list[i] > this->max_size_list[i]) { this->location_list.erase(this->location_list.begin() + i); this->directon_list.erase(this->directon_list.begin() + i); this->size_list.erase(this->size_list.begin() + i); this->speed_list.erase(this->speed_list.begin() + i); this->max_size_list.erase(this->max_size_list.begin() + i); this->deg_list.erase(this->deg_list.begin() + i); this->color_list.erase(this->color_list.begin() + i); } } ofColor color; for (int i = 0; i < 3; i++) { auto location = glm::vec2(); this->location_list.push_back(location); auto direction = glm::normalize(glm::vec2(ofRandom(-5, 5), ofRandom(-5, 5))) * ofRandom(3, 10); this->directon_list.push_back(direction); this->size_list.push_back(1); this->speed_list.push_back(ofRandom(1, 2)); this->max_size_list.push_back(ofRandom(20, 100)); this->deg_list.push_back(ofRandom(360)); color.setHsb(ofRandom(255), 255, 255); this->color_list.push_back(color); } } //-------------------------------------------------------------- void ofApp::draw() { ofTranslate(ofGetWindowSize() * 0.5); ofNoFill(); for (int i = 0; i < this->location_list.size(); i++) { ofPushMatrix(); ofTranslate(this->location_list[i]); ofRotate(this->deg_list[i]); vector<glm::vec2> vertices; for (int deg = 0; deg < 360; deg += 2) { vertices.push_back(this->make_point(deg * DEG_TO_RAD) / 30 * this->size_list[i]); } auto alpha_1 = this->size_list[i] > this->max_size_list[i] * 0.6 ? ofMap(this->size_list[i], this->max_size_list[i] * 0.6, this->max_size_list[i], 255, 0) : 255; auto alpha_2 = this->size_list[i] > this->max_size_list[i] * 0.6 ? ofMap(this->size_list[i], this->max_size_list[i] * 0.6, this->max_size_list[i], 255, 32) : 255; ofFill(); ofSetColor(this->color_list[i], alpha_1); ofBeginShape(); ofVertices(vertices); ofEndShape(true); ofNoFill(); ofSetColor(this->color_list[i], alpha_2); ofBeginShape(); ofVertices(vertices); ofEndShape(true); ofPopMatrix(); } } //-------------------------------------------------------------- //Reference by https://twitter.com/shiffman/status/1095764239665512453 glm::vec2 ofApp::make_point(float theta) { float x = 16 * (pow(sin(theta), 3)); float y = 13 * cos(theta) - 5 * cos(2 * theta) - 2 * cos(3 * theta) - cos(4 * theta); return glm::vec2(x, -y); } //-------------------------------------------------------------- int main() { ofSetupOpenGL(720, 720, OF_WINDOW); ofRunApp(new ofApp()); } |