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花火。
fireworks.
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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<float> circles_life; vector<ofColor> circles_color; }; |
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#include "ofApp.h" //-------------------------------------------------------------- void ofApp::setup() { ofSetFrameRate(60); ofBackground(0); ofSetWindowTitle("Insta"); ofSetCircleResolution(32); this->box2d.init(); this->box2d.setGravity(0, 20); this->box2d.createBounds(); this->box2d.setFPS(60); this->box2d.registerGrabbing(); } //-------------------------------------------------------------- void ofApp::update() { for (int i = this->circles.size() - 1; i > -1; i--) { if (this->circles_life[i] < 0) { this->circles[i].get()->destroy(); this->circles.erase(this->circles.begin() + i); this->circles_life.erase(this->circles_life.begin() + i); this->circles_color.erase(this->circles_color.begin() + i); } } this->box2d.update(); } //-------------------------------------------------------------- void ofApp::draw() { for (int i = 0; i < this->circles.size(); i++) { ofSetColor(this->circles_color[i], this->circles_life[i]); ofDrawCircle(this->circles[i].get()->getPosition().x, this->circles[i].get()->getPosition().y, 8); this->circles_life[i] -= 1; } } //-------------------------------------------------------------- void ofApp::mousePressed(int x, int y, int button) { float radius = 10; for (int i = 0; i < 5; i++) { float color_value = ofRandom(256); for (int deg = 0; deg < 360; deg += 10) { float tmp_x = radius * cos(deg * DEG_TO_RAD); float tmp_y = radius * sin(deg * DEG_TO_RAD); this->circles.push_back(shared_ptr<ofxBox2dCircle>(new ofxBox2dCircle)); this->circles.back().get()->setPhysics(3.0, 0.5, 0.1); this->circles.back().get()->setup(this->box2d.getWorld(), x + tmp_x, y + tmp_y, 8); this->circles.back().get()->addForce(ofVec2f(tmp_x, tmp_y), 16.0); this->circles_life.push_back(255); ofColor circle_color; circle_color.setHsb(color_value, 255, 255); this->circles_color.push_back(circle_color); } radius += 10; } } //-------------------------------------------------------------- int main() { ofSetupOpenGL(1920, 1080, OF_WINDOW); ofRunApp(new ofApp()); } |