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位置と色はフレーム番号から計算して、対になる方には反対の値とする。
The position and color are calculated from the frame number, and the opposite for the pair.
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#pragma once #include "ofMain.h" #include "ofxBox2d.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) {}; ofEasyCam cam; ofxBox2d box2d; vector<shared_ptr<ofxBox2dCircle>> circle_list; vector<float> radius_list; vector<float> life_list; vector<ofColor> color_list; }; |
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#include "ofApp.h" //-------------------------------------------------------------- void ofApp::setup() { ofSetFrameRate(60); ofSetWindowTitle("openFrameworks"); ofBackground(239); ofSetCircleResolution(60); this->box2d.init(); this->box2d.setGravity(0, 50); this->box2d.createBounds(); this->box2d.setFPS(60); this->box2d.registerGrabbing(); } //-------------------------------------------------------------- void ofApp::update() { for (int i = this->circle_list.size() - 1; i > -1; i--) { this->life_list[i] -= 1; if (this->life_list[i] < 0) { this->circle_list.erase(this->circle_list.begin() + i); this->radius_list.erase(this->radius_list.begin() + i); this->life_list.erase(this->life_list.begin() + i); this->color_list.erase(this->color_list.begin() + i); } } for (int i = 0; i < 2; i++) { int deg = ofMap(ofNoise(ofGetFrameNum() * 0.01), 0, 1, 0, 720) + i * 180; auto location = glm::vec2(ofGetWidth() * 0.5 + 150 * cos(deg * DEG_TO_RAD), 200 + 150 * sin(deg * DEG_TO_RAD)); auto radius = 10; auto circle = make_shared<ofxBox2dCircle>(); circle->setPhysics(0.5, 0.03, 0.1); circle->setup(this->box2d.getWorld(), location.x, location.y, radius); this->circle_list.push_back(circle); this->radius_list.push_back(radius); this->life_list.push_back(200); ofColor color; color.setHsb((ofGetFrameNum() + i * 128) % 255, 130, 255); this->color_list.push_back(color); } this->box2d.update(); } //-------------------------------------------------------------- void ofApp::draw() { this->cam.begin(); ofRotateX(180); ofTranslate(ofGetWidth() * -0.5, ofGetHeight() * -0.5); ofDrawCircle(glm::vec2(ofGetWidth() * 0.5, 200), 140); ofDrawCircle(glm::vec2(ofGetWidth() * 0.5, 200), 160); ofSetLineWidth(1); for (int i = 0; i < this->circle_list.size(); i++) { ofFill(); ofSetColor(this->color_list[i]); ofDrawCircle(glm::vec2(this->circle_list[i]->getPosition()), this->radius_list[i]); ofNoFill(); ofSetColor(39); ofDrawCircle(glm::vec2(this->circle_list[i]->getPosition()), this->radius_list[i]); } ofSetLineWidth(3); ofSetColor(39); ofDrawRectangle(0, 0, 720, 720); this->cam.end(); } //-------------------------------------------------------------- int main() { ofSetupOpenGL(720, 720, OF_WINDOW); ofRunApp(new ofApp()); } |
[ Link ]
https://github.com/junkiyoshi/Insta20211001