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円の上を結ぶ矢印。
Arrows connecting the top of the circle.
[ Source ]
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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) {}; void draw_arrow(glm::vec2 location, glm::vec2 target, float size, ofColor color); }; |
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#include "ofApp.h" //-------------------------------------------------------------- void ofApp::setup() { ofSetFrameRate(30); ofSetWindowTitle("openframeworks"); ofBackground(255); } //-------------------------------------------------------------- void ofApp::update() { } //-------------------------------------------------------------- void ofApp::draw() { ofTranslate(ofGetWindowSize() * 0.5); auto span = 15; for (auto radius = 50; radius <= 720; radius += 30) { for (auto deg = 0; deg < 720; deg += span - 3) { auto location = glm::vec2(radius * cos(deg * DEG_TO_RAD), radius * sin(deg * DEG_TO_RAD)); auto noise_location = glm::vec2(cos(deg * DEG_TO_RAD), sin(deg * DEG_TO_RAD)); auto target_deg = ofMap(ofNoise(glm::vec3(noise_location, ofGetFrameNum() * 0.03 + radius * 0.03)), 0, 1, span * -0.5, span * 0.5); auto target = glm::vec2(radius * cos((deg + target_deg) * DEG_TO_RAD), radius * sin((deg + target_deg) * DEG_TO_RAD)); this->draw_arrow(location, target, ofMap(radius, 150, 300, 8, 15), ofColor(0)); } } } //-------------------------------------------------------------- void ofApp::draw_arrow(glm::vec2 location, glm::vec2 target, float size, ofColor color) { auto angle = std::atan2(target.y - location.y, target.x - location.x); auto distance = glm::distance(target, location); if (glm::length(distance) > size * 0) { ofPushMatrix(); ofTranslate(target); ofSetColor(color); ofFill(); ofBeginShape(); ofVertex(glm::vec2(size * cos(angle), size * sin(angle))); ofVertex(glm::vec2(size * 0.5 * cos(angle + PI * 0.5), size * 0.5 * sin(angle + PI * 0.5))); ofVertex(glm::vec2(size * 0.5 * cos(angle - PI * 0.5), size * 0.5 * sin(angle - PI * 0.5))); ofEndShape(); ofBeginShape(); ofVertex(glm::vec2(size * 0.5 * cos(angle + PI * 0.5), size * 0.5 * sin(angle + PI * 0.5)) * 0.25); ofVertex(glm::vec2(size * 0.5 * cos(angle + PI * 0.5), size * 0.5 * sin(angle + PI * 0.5)) * 0.25 - glm::vec2(distance * cos(angle), distance * sin(angle))); ofVertex(glm::vec2(size * 0.5 * cos(angle - PI * 0.5), size * 0.5 * sin(angle - PI * 0.5)) * 0.25 - glm::vec2(distance * cos(angle), distance * sin(angle))); ofVertex(glm::vec2(size * 0.5 * cos(angle - PI * 0.5), size * 0.5 * sin(angle - PI * 0.5)) * 0.25); ofEndShape(); ofPopMatrix(); } ofDrawCircle(location, size * 0.3); } //-------------------------------------------------------------- int main() { ofSetupOpenGL(720, 720, OF_WINDOW); ofRunApp(new ofApp()); } |