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円の交点
Circle intersection point.
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#pragma once #include "ofMain.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) {}; bool calculate_angle(glm::vec2 location_1, float radius_1, glm::vec2 location_2, float radius_2, double& theta, double& a); }; |
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#include "ofApp.h" //-------------------------------------------------------------- void ofApp::setup() { ofSetFrameRate(60); ofSetWindowTitle("openFrameworks"); ofBackground(239); ofSetColor(39); ofNoFill(); ofSetLineWidth(2); ofSetCircleResolution(72); } //-------------------------------------------------------------- void ofApp::update() { ofSeedRandom(39); } //-------------------------------------------------------------- void ofApp::draw() { vector<pair<glm::vec2, float>> circles; circles.push_back(make_pair(glm::vec2(ofGetWidth() * 0.5, ofGetHeight() * 0.5), 250)); for (int i = 0; i < 20; i++) { auto location = glm::vec2(ofMap(ofNoise(ofRandom(1000), ofGetFrameNum() * 0.001), 0, 1, 0, ofGetWidth()), ofMap(ofNoise(ofRandom(1000), ofGetFrameNum() * 0.001), 0, 1, 0, ofGetHeight())); auto radius = ofRandom(30, 60); auto circle = make_pair(location, radius); circles.push_back(circle); } for (auto circle : circles) { ofNoFill(); ofDrawCircle(circle.first, circle.second); for (auto other : circles) { if (circle == other) { continue; } double theta, a; if (this->calculate_angle(circle.first, circle.second, other.first, other.second, theta, a)) { auto point_1 = circle.first + glm::vec2(circle.second * cos(theta + a), circle.second * sin(theta + a)); auto point_2 = circle.first + glm::vec2(circle.second * cos(theta - a), circle.second * sin(theta - a)); ofFill(); ofDrawCircle(point_1, 7); ofDrawCircle(point_2, 7); } } } } //-------------------------------------------------------------- bool ofApp::calculate_angle(glm::vec2 location_1, float radius_1, glm::vec2 location_2, float radius_2, double& theta, double& a) { auto distance = glm::distance(location_1, location_2); if (distance > radius_1 + radius_2 || distance < radius_1 - radius_2) { return false; } theta = atan2(location_2.y - location_1.y, location_2.x - location_1.x); auto cos_a = (pow(distance, 2) + pow(radius_1, 2) - pow(radius_2, 2)) / (2 * distance * radius_1); a = acos(cos_a); return true; } //-------------------------------------------------------------- int main() { ofSetupOpenGL(720, 720, OF_WINDOW); ofRunApp(new ofApp()); } |