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反発するカラーパーティクル。速度と透明度をリンク
Repelling particles.
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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 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) {}; ofxBox2d box2d; vector<shared_ptr<ofxBox2dCircle>> circles; vector<ofColor> colors; }; |
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#include "ofApp.h" //-------------------------------------------------------------- void ofApp::setup() { ofSetFrameRate(30); ofSetWindowTitle("openframeworks"); ofBackground(239); ofSetColor(39); //ofNoFill(); ofSetLineWidth(1.5); this->box2d.init(); this->box2d.setGravity(0, 0); this->box2d.createBounds(); this->box2d.setFPS(30); this->box2d.registerGrabbing(); for (int i = 0; i < 100; i++) { this->circles.push_back(shared_ptr<ofxBox2dCircle>(new ofxBox2dCircle)); this->circles.back().get()->setPhysics(1.5, 0.5, 0.1); this->circles.back().get()->setup(this->box2d.getWorld(), ofRandom(ofGetWidth()), ofRandom(ofGetHeight()), 15); ofColor color; color.setHsb(ofRandom(255), 255, 255); this->colors.push_back(color); } } //-------------------------------------------------------------- void ofApp::update() { for (int i = 0; i < this->circles.size(); i++) { for (int j = i + 1; j < this->circles.size(); j++) { float distance = this->circles[i]->getPosition().distance(this->circles[j]->getPosition()); if (distance < 60) { this->circles[i]->addForce(this->circles[i]->getPosition() - this->circles[j]->getPosition(), 1.0); this->circles[j]->addForce(this->circles[j]->getPosition() - this->circles[i]->getPosition(), 1.0); } } } this->box2d.update(); } //-------------------------------------------------------------- void ofApp::draw() { for (int i = 0; i < this->circles.size(); i++) { ofPoint point = ofPoint(this->circles[i]->getPosition().x, this->circles[i]->getPosition().y); ofSetColor(this->colors[i], ofMap(this->circles[i]->getVelocity().length(), 1, 10, 0, 255)); ofDrawCircle(point, 15); } } //-------------------------------------------------------------- int main() { ofSetupOpenGL(720, 720, OF_WINDOW); ofRunApp(new ofApp()); } |