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パーティクルの速度と色の透明度をリンクさせてみました。
Velocity is linked with color alpha.
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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<pair<shared_ptr<ofxBox2dCircle>, ofColor>> circles; int force_field_radius; }; |
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#include "ofApp.h" //-------------------------------------------------------------- void ofApp::setup() { ofSetFrameRate(60); ofSetWindowTitle("openFrameworks"); ofBackground(39); // Initialize ofxBox2d this->box2d.init(); this->box2d.setGravity(0, 0); this->box2d.createBounds(); this->box2d.setFPS(60); this->box2d.registerGrabbing(); // Add Circle for (int i = 0; i < 256; i++) { float radius = 12; shared_ptr<ofxBox2dCircle> circle = make_shared<ofxBox2dCircle>(); circle->setPhysics(1.0, 0.85, 0.5); circle->setup(this->box2d.getWorld(), ofRandom(ofGetWidth()), ofRandom(ofGetHeight()), radius); ofColor color; color.setHsb(ofRandom(255), 239, 239); this->circles.push_back(make_pair(circle, color)); } this->force_field_radius = 150; } //-------------------------------------------------------------- void ofApp::update() { // Field of Force on Center for (int i = 0; i < this->circles.size(); i++) { shared_ptr<ofxBox2dCircle> circle = get<0>(this->circles[i]); ofPoint point = get<0>(this->circles[i])->getPosition(); float distance = point.distance(ofPoint(ofGetWidth() / 2, ofGetHeight() / 2)); if(distance < this->force_field_radius) { ofPoint p = ofPoint(this->force_field_radius * cos(ofGetFrameNum() * DEG_TO_RAD), this->force_field_radius * sin(ofGetFrameNum() * DEG_TO_RAD)); circle->addForce(p, ofMap(distance, 0, this->force_field_radius, 15, 1)); } } // Compute box2d this->box2d.update(); } //-------------------------------------------------------------- void ofApp::draw() { ofPushMatrix(); ofTranslate(ofGetWidth() / 2, ofGetHeight() / 2); // Draw Filed of Force ofNoFill(); ofSetColor(239); ofSetLineWidth(0.5); ofBeginShape(); for (int deg = 0; deg < 360; deg += 1) { ofVertex(this->force_field_radius * cos(deg * DEG_TO_RAD), this->force_field_radius * sin(deg * DEG_TO_RAD)); } ofEndShape(true); ofFill(); ofBeginShape(); for (int deg = ofGetFrameNum(); deg < ofGetFrameNum() + 360; deg += 120) { ofVertex(this->force_field_radius * cos(deg * DEG_TO_RAD), this->force_field_radius * sin(deg * DEG_TO_RAD)); } ofEndShape(true); ofSetColor(39); ofBeginShape(); for (int deg = ofGetFrameNum(); deg < ofGetFrameNum() + 360; deg += 120) { ofVertex(this->force_field_radius * 0.5 * cos(deg * DEG_TO_RAD), this->force_field_radius * 0.5 * sin(deg * DEG_TO_RAD)); } ofEndShape(true); ofPopMatrix(); // Draw Circles ofSetLineWidth(3); for (int i = 0; i < this->circles.size(); i++) { shared_ptr<ofxBox2dCircle> circle = get<0>(this->circles[i]); ofColor circle_color = get<1>(this->circles[i]); float radius = circle->getRadius(); ofPoint point = circle->getPosition(); ofSetColor(circle_color, ofMap(circle->getVelocity().length(), 3, 12, 0, 255)); ofDrawCircle(point, radius); ofDrawLine(point, point - get<0>(this->circles[i])->getVelocity()); } } //-------------------------------------------------------------- int main() { ofSetupOpenGL(720, 720, OF_WINDOW); ofRunApp(new ofApp()); } |