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四角から矢印。
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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 windowResized(int w, int h) {}; void dragEvent(ofDragInfo dragInfo) {}; void gotMessage(ofMessage msg) {}; glm::vec2 make_point(int len, int param); 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(0); } //-------------------------------------------------------------- void ofApp::update() { ofSeedRandom(39); } //-------------------------------------------------------------- void ofApp::draw() { ofTranslate(ofGetWindowSize() * 0.5); vector<ofColor> color_list; float len = 600; vector<glm::vec2> target_list; ofColor color; for (int i = 0; i < 3; i++) { auto noise_param = ofMap(ofNoise(ofRandom(1000), ofGetFrameNum() * 0.003), 0, 1, 0, 200); target_list.push_back(this->make_point(len, noise_param)); color.setHsb(ofMap(i, 0, 3, 0, 255), 100, 255); color_list.push_back(color); } for (int i = 0; i < target_list.size(); i++) { ofSetColor(color_list[i]); ofDrawCircle(target_list[i], 8); } for (int param = 0; param <= 100; param += 2) { auto location = this->make_point(len, param); auto target = target_list[0]; auto index = 0; auto distance = glm::distance(location, target_list[0]); for (int i = 1; i < target_list.size(); i++) { if (distance > glm::distance(location, target_list[i])) { target = target_list[i]; index = i; distance = glm::distance(location, target_list[i]); } } ofDrawCircle(this->make_point(len, param), 4); this->draw_arrow(this->make_point(len, param), target, 16, color_list[index]); } } //-------------------------------------------------------------- glm::vec2 ofApp::make_point(int len, int param) { param = param % 100; if (param < 25) { return glm::vec2(ofMap(param, 0, 25, -len * 0.5, len * 0.5), -len * 0.5); } else if (param < 50) { return glm::vec2(len * 0.5, ofMap(param, 25, 50, -len * 0.5, len * 0.5)); } else if (param < 75) { return glm::vec2(ofMap(param, 50, 75, len * 0.5, -len * 0.5), len * 0.5); } else { return glm::vec2(-len * 0.5, ofMap(param, 75, 100, len * 0.5, -len * 0.5)); } } //-------------------------------------------------------------- void ofApp::draw_arrow(glm::vec2 location, glm::vec2 target, float size, ofColor color) { if (glm::distance(location, target) < size) return; auto angle = std::atan2(target.y - location.y, target.x - location.x); auto translate_location = target - glm::vec2(size * 3 * cos(angle), size * 3 * sin(angle)); auto distance = glm::distance(translate_location, location); ofPushMatrix(); ofTranslate(translate_location); ofSetColor(color); ofFill(); ofBeginShape(); ofVertex(glm::vec2(size * cos(angle), size * sin(angle))); ofVertex(glm::vec2(size * 0.25 * cos(angle + PI * 0.5), size * 0.25 * sin(angle + PI * 0.5))); ofVertex(glm::vec2(size * 0.25 * cos(angle - PI * 0.5), size * 0.25 * sin(angle - PI * 0.5))); ofEndShape(); ofBeginShape(); ofVertex(glm::vec2(size * 0.25 * cos(angle + PI * 0.5), size * 0.25 * sin(angle + PI * 0.5)) * 0.25); ofVertex(glm::vec2(size * 0.25 * cos(angle + PI * 0.5), size * 0.25 * sin(angle + PI * 0.5)) * 0.25 - glm::vec2(distance * cos(angle), distance * sin(angle))); ofVertex(glm::vec2(size * 0.25 * cos(angle - PI * 0.5), size * 0.25 * sin(angle - PI * 0.5)) * 0.25 - glm::vec2(distance * cos(angle), distance * sin(angle))); ofVertex(glm::vec2(size * 0.25 * cos(angle - PI * 0.5), size * 0.25 * sin(angle - PI * 0.5)) * 0.25); ofEndShape(); ofPopMatrix(); } //-------------------------------------------------------------- int main() { ofSetupOpenGL(720, 720, OF_WINDOW); ofRunApp(new ofApp()); } |