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線はお互いの色のグラデーションカラー。
Gradation color line.
[ Source ]
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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) {}; float radius; ofxBox2d box2d; vector<shared_ptr<ofxBox2dCircle>> circle_list; vector<ofColor> color_list; }; |
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#include "ofApp.h" //-------------------------------------------------------------- void ofApp::setup() { ofSetFrameRate(60); ofSetWindowTitle("openFrameworks"); ofBackground(0); ofSetLineWidth(2); ofNoFill(); this->radius = 20; this->box2d.init(); this->box2d.setGravity(0, 0); this->box2d.createBounds(20, 20, 680, 680); this->box2d.setFPS(60); this->box2d.registerGrabbing(); ofColor color; for (int i = 0; i < 50; i++) { auto circle = make_shared<ofxBox2dCircle>(); circle->setPhysics(0.5, 0.63, 0.1); circle->setup(this->box2d.getWorld(), ofRandom(30, 670), ofRandom(30, 670), this->radius); this->circle_list.push_back(circle); color.setHsb(ofMap(i, 0, 50, 0, 255), 180, 255); this->color_list.push_back(color); } } //-------------------------------------------------------------- void ofApp::update() { ofSeedRandom(39); for (int i = 0; i < this->circle_list.size(); i++) { for (int j = i + 1; j < this->circle_list.size(); j++) { float distance = this->circle_list[i]->getPosition().distance(this->circle_list[j]->getPosition()); if (distance < this->radius * 4) { this->circle_list[i]->addForce(this->circle_list[i]->getPosition() - this->circle_list[j]->getPosition(), ofMap(distance, this->radius, this->radius * 4, 1, 2)); this->circle_list[j]->addForce(this->circle_list[j]->getPosition() - this->circle_list[i]->getPosition(), ofMap(distance, this->radius, this->radius * 4, 1, 2)); } } } this->box2d.update(); } //-------------------------------------------------------------- void ofApp::draw() { ofMesh line; line.setMode(ofPrimitiveMode::OF_PRIMITIVE_LINES); auto threshold = 100; for (int i = 0; i < this->circle_list.size(); i++) { glm::vec2 location = this->circle_list[i]->getPosition(); ofSetColor(this->color_list[i]); ofDrawCircle(location, 10); for (int k = 0; k < this->circle_list.size(); k++) { glm::vec2 other = this->circle_list[k]->getPosition(); if (location == other) { continue; } auto distance = glm::distance(location, other); if (distance < threshold) { auto direction_rad = std::atan2(other.y - location.y, other.x - location.x); auto direction = direction_rad * RAD_TO_DEG; auto width = ofMap(distance, 0, threshold, 360, 0); ofNoFill(); ofBeginShape(); for (auto deg = direction - width * 0.65; deg <= direction + width * 0.65; deg++) { ofVertex(location.x + this->radius * cos(deg * DEG_TO_RAD), location.y + this->radius * sin(deg * DEG_TO_RAD)); } ofEndShape(); line.addVertex(glm::vec3(location + glm::vec2(this->radius * cos(direction * DEG_TO_RAD), this->radius * sin(direction * DEG_TO_RAD)), 0)); line.addVertex(glm::vec3(other + glm::vec2(this->radius * cos((180 + direction) * DEG_TO_RAD), this->radius * sin((180 + direction) * DEG_TO_RAD)), 0)); line.addColor(this->color_list[i]); line.addColor(this->color_list[k]); line.addIndex(line.getNumVertices() - 1); line.addIndex(line.getNumVertices() - 2); } } } ofSetColor(255); ofDrawRectangle(20, 20, 680, 680); line.drawWireframe(); } //-------------------------------------------------------------- int main() { ofSetupOpenGL(720, 720, OF_WINDOW); ofRunApp(new ofApp()); } |