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矢印の線長は速度とリンクしています
Arrow is linked to speed with line length.
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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<ofPoint> force_fields; int force_field_radius; }; |
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#include "ofApp.h" //-------------------------------------------------------------- void ofApp::setup() { ofSetFrameRate(60); ofSetWindowTitle("Insta"); ofBackground(39); ofSetColor(239); ofSetLineWidth(2); this->box2d.init(); this->box2d.setGravity(0, 0); this->box2d.createBounds(); this->box2d.setFPS(60); this->box2d.registerGrabbing(); for (int i = 0; i < 255; i++) { float radius = 15; auto circle = make_shared<ofxBox2dCircle>(); circle->setPhysics(0.8, 0.63, 0.1); circle->setup(this->box2d.getWorld(), ofRandom(ofGetWidth() / 2), ofRandom(ofGetHeight() / 2), radius); this->circles.push_back(circle); } this->force_fields.push_back(ofPoint(ofGetWidth() / 4, ofGetHeight() / 4)); this->force_fields.push_back(ofPoint(ofGetWidth() / 4 * 3, ofGetHeight() / 4)); this->force_fields.push_back(ofPoint(ofGetWidth() / 4 * 3, ofGetHeight() / 4 * 3)); this->force_fields.push_back(ofPoint(ofGetWidth() / 4, ofGetHeight() / 4 * 3)); this->force_field_radius = 300; } //-------------------------------------------------------------- void ofApp::update() { ofSeedRandom(39); for (int i = 0; i < this->circles.size(); i++) { shared_ptr<ofxBox2dCircle> circle = this->circles[i]; ofPoint point = circle->getPosition(); for (int field_index = 0; field_index < this->force_fields.size(); field_index++) { float distance = point.distance(this->force_fields[field_index]); if (distance < this->force_field_radius) { ofPoint p = ofPoint(this->force_field_radius * cos((field_index * 90 + 10) * DEG_TO_RAD), this->force_field_radius * sin((field_index * 90 + 10) * DEG_TO_RAD)); circle->addForce(p, ofMap(distance, 0, this->force_field_radius, 0.1, 0.05)); } } } this->box2d.update(); } //-------------------------------------------------------------- void ofApp::draw() { for (int i = 0; i < this->circles.size(); i++) { float radius = this->circles[i]->getRadius(); ofPoint point = this->circles[i]->getPosition(); ofPoint velocity = this->circles[i]->getVelocity(); ofPushMatrix(); ofTranslate(point); ofColor tmp_color; tmp_color.setHsb(ofRandom(255), 230, 255); ofSetColor(tmp_color); float velocity_deg = atan2f(velocity.y, velocity.x) * RAD_TO_DEG; ofBeginShape(); for (int deg = velocity_deg; deg < velocity_deg + 270; deg += 120) { ofVertex(radius * cos(deg * DEG_TO_RAD), radius * sin(deg * DEG_TO_RAD)); } ofEndShape(true); ofDrawLine(ofPoint(radius * cos(velocity_deg * DEG_TO_RAD), radius * sin(velocity_deg * DEG_TO_RAD)), velocity * -1.0); ofPopMatrix(); } } //-------------------------------------------------------------- int main() { ofSetupOpenGL(1280, 720, OF_WINDOW); ofRunApp(new ofApp()); } |