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SurfacePen(mouse)の加速度がオブジェクトに反映されます。
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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) {}; ofEasyCam cam; ofxBox2d box2d; vector<shared_ptr<ofxBox2dCircle>> circles; vector<ofColor> circles_color; vector<float> circles_life; }; |
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#include "ofApp.h" //-------------------------------------------------------------- void ofApp::setup() { ofSetFrameRate(60); ofBackground(0); ofSetWindowTitle("Insta"); ofSetCircleResolution(60); this->box2d.init(); this->box2d.setGravity(0, 0); this->box2d.createBounds(); this->box2d.setFPS(60); this->box2d.registerGrabbing(); } //-------------------------------------------------------------- void ofApp::update() { if (ofGetMousePressed()) { ofVec2f mouse_position = ofVec2f(ofGetMouseX(), ofGetMouseY()); ofVec2f prev_mouse_position = ofVec2f(ofGetPreviousMouseX(), ofGetPreviousMouseY()); ofVec2f difference = mouse_position - prev_mouse_position; for (int i = 0; i < 10; i++) { this->circles.push_back(shared_ptr<ofxBox2dCircle>(new ofxBox2dCircle)); this->circles.back().get()->setPhysics(3.0, 0.53, 0.1); this->circles.back().get()->setup(this->box2d.getWorld(), mouse_position.x, mouse_position.y, 5); this->circles.back().get()->addForce(difference, 20.0); ofColor line_color; line_color.setHsb(ofGetFrameNum() % 255, 255, 255); this->circles_color.push_back(line_color); this->circles_life.push_back(255); } } this->box2d.update(); for (int i = 0; i < this->circles.size(); i++) { if (this->circles_life[i] < 0) { this->circles[i].get()->destroy(); this->circles.erase(this->circles.begin() + i); this->circles_color.erase(this->circles_color.begin() + i); this->circles_life.erase(this->circles_life.begin() + i); } } } //-------------------------------------------------------------- void ofApp::draw() { ofFill(); for (int i = 0; i < this->circles.size(); i++) { ofSetColor(this->circles_color[i], this->circles_life[i]); //this->circles[i].get()->draw(); ofDrawCircle(this->circles[i].get()->getPosition(), 5); this->circles_life[i] -= 1.5f; } } //-------------------------------------------------------------- int main() { ofSetupOpenGL(720, 720, OF_WINDOW); ofRunApp(new ofApp()); } |