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Arrow is direction.
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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 windowResized(int w, int h) {}; void dragEvent(ofDragInfo dragInfo) {}; void gotMessage(ofMessage msg) {}; void draw_arrow(glm::vec2 location, glm::vec2 next_location, float size); vector<ofColor> base_color_list; ofxBox2d box2d; vector<shared_ptr<ofxBox2dCircle>> circle_list; vector<float> radius_list; vector<ofColor> color_list; vector<float> life_list; vector<float> life_speed_list; ofTrueTypeFont font; }; |
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#include "ofApp.h" //-------------------------------------------------------------- void ofApp::setup() { ofSetFrameRate(60); ofSetWindowTitle("openFrameworks"); ofBackground(239); ofSetLineWidth(2); ofSetCircleResolution(60); this->font.loadFont("fonts/Kazesawa-Bold.ttf", 20, true, true, true); ofColor color; vector<int> hex_list = { 0xef476f, 0xffd166, 0x06d6a0, 0x118ab2, 0x073b4c }; for (auto hex : hex_list) { color.setHex(hex); this->base_color_list.push_back(color); } this->box2d.init(); this->box2d.setGravity(0, 50); this->box2d.createBounds(); this->box2d.setFPS(60); this->box2d.registerGrabbing(); } //-------------------------------------------------------------- void ofApp::update() { for (int i = this->circle_list.size() - 1; i > -1; i--) { this->life_list[i] -= this->life_speed_list[i]; if (this->life_list[i] < 0) { this->circle_list.erase(this->circle_list.begin() + i); this->radius_list.erase(this->radius_list.begin() + i); this->color_list.erase(this->color_list.begin() + i); this->life_list.erase(this->life_list.begin() + i); this->life_speed_list.erase(this->life_speed_list.begin() + i); } } if (ofGetFrameNum() % 15 == 0) { auto radius = ofRandom(25, 50); auto circle = make_shared<ofxBox2dCircle>(); circle->setPhysics(0.5, 0.83, 0.3); circle->setup(this->box2d.getWorld(), ofRandom(radius, ofGetWidth() - radius), radius, radius); circle->setRotation(ofRandom(360)); this->circle_list.push_back(circle); this->radius_list.push_back(radius); int color_index = ofRandom(this->base_color_list.size()); this->color_list.push_back(this->base_color_list[color_index]); this->life_list.push_back(128); this->life_speed_list.push_back(ofRandom(0.5, 1.2)); } this->box2d.update(); } //-------------------------------------------------------------- void ofApp::draw() { for (int i = 0; i < this->circle_list.size(); i++) { ofPushMatrix(); ofTranslate(this->circle_list[i]->getPosition()); auto color_value = this->life_list[i] < 30 ? ofMap(this->life_list[i], 0, 30, 239, 39) : 39; ofNoFill(); ofSetColor(ofColor(this->color_list[i], ofMap(color_value, 39, 239, 255, 0))); ofDrawCircle(glm::vec3(), this->radius_list[i]); this->draw_arrow(glm::vec3(), this->circle_list[i]->getVelocity(), this->radius_list[i] * 0.8); ofPopMatrix(); } } //-------------------------------------------------------------- void ofApp::draw_arrow(glm::vec2 location, glm::vec2 next_location, float size) { auto angle = std::atan2(next_location.y - location.y, next_location.x - location.x); ofFill(); ofBeginShape(); ofVertex(location + glm::vec2(size * cos(angle), size * sin(angle))); ofVertex(location + glm::vec2(size * 0.5 * cos(angle + PI * 0.5), size * 0.5 * sin(angle + PI * 0.5))); ofVertex(location + glm::vec2(size * 0.5 * cos(angle - PI * 0.5), size * 0.5 * sin(angle - PI * 0.5))); ofEndShape(); ofBeginShape(); ofVertex(location + glm::vec2(size * 0.5 * cos(angle + PI * 0.5), size * 0.5 * sin(angle + PI * 0.5)) * 0.25); ofVertex(location + glm::vec2(size * 0.5 * cos(angle + PI * 0.5), size * 0.5 * sin(angle + PI * 0.5)) * 0.25 - glm::vec2(size * cos(angle), size * sin(angle)) * 0.5); ofVertex(location + glm::vec2(size * 0.5 * cos(angle - PI * 0.5), size * 0.5 * sin(angle - PI * 0.5)) * 0.25 - glm::vec2(size * cos(angle), size * sin(angle)) * 0.5); ofVertex(location + glm::vec2(size * 0.5 * cos(angle - PI * 0.5), size * 0.5 * sin(angle - PI * 0.5)) * 0.25); ofEndShape(); } //-------------------------------------------------------------- int main() { ofSetupOpenGL(720, 720, OF_WINDOW); ofRunApp(new ofApp()); } |