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環状線。
Loop line.
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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) {}; ofEasyCam cam; ofMesh face, frame; }; |
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#include "ofApp.h" //-------------------------------------------------------------- void ofApp::setup() { ofSetFrameRate(60); ofSetWindowTitle("openFrameworks"); ofBackground(239); ofEnableDepthTest(); ofSetLineWidth(3); this->frame.setMode(ofPrimitiveMode::OF_PRIMITIVE_LINES); } //-------------------------------------------------------------- void ofApp::update() { ofSeedRandom(39); this->face.clear(); this->frame.clear(); auto radius_min = 50; auto radius_max = 200; auto radius_span = 10; auto len = 360; for (auto radius = radius_min; radius < radius_max; radius += radius_span) { auto start_deg = ofGetFrameNum() * ofRandom(3, 5) + ofRandom(720); int start_index = this->face.getNumVertices(); vector<glm::vec3> vertices; for (int deg = start_deg; deg < start_deg + len; deg += 1) { auto param = deg % 720; auto z = 0; if (param < 360) { z = param < 180 ? ofMap(param, 0, 180, -30, -20) : ofMap(param, 180, 360, -20, 30); vertices.push_back(glm::vec3(radius * cos(deg * DEG_TO_RAD), radius * sin(deg * DEG_TO_RAD), z) + glm::vec3((radius_min + radius_max) * -0.5, 0, 0)); vertices.push_back(glm::vec3((radius + radius_span) * cos(deg * DEG_TO_RAD), (radius + radius_span) * sin(deg * DEG_TO_RAD), z) + glm::vec3((radius_min + radius_max) * -0.5, 0, 0)); } else { z = param < 540 ? ofMap(param, 360, 540, 30, 20) : ofMap(param, 540, 720, 20, -30); int tmp_radius = ofMap(radius, radius_min, radius_max, radius_max, radius_min); vertices.push_back(glm::vec3(-1 * tmp_radius * cos(deg * DEG_TO_RAD), tmp_radius * sin(deg * DEG_TO_RAD), z) + glm::vec3((radius_min + radius_max) * 0.5, 0, 0)); vertices.push_back(glm::vec3(-1 * (tmp_radius - radius_span) * cos(deg * DEG_TO_RAD), (tmp_radius - radius_span) * sin(deg * DEG_TO_RAD), z) + glm::vec3((radius_min + radius_max) * 0.5, 0, 0)); } } this->face.addVertices(vertices); this->frame.addVertices(vertices); for (int i = start_index; i < this->face.getNumVertices() - 4; i += 2) { this->face.addIndex(i + 0); this->face.addIndex(i + 2); this->face.addIndex(i + 3); this->face.addIndex(i + 0); this->face.addIndex(i + 3); this->face.addIndex(i + 1); this->frame.addIndex(i + 0); this->frame.addIndex(i + 2); this->frame.addIndex(i + 1); this->frame.addIndex(i + 3); } this->face.addIndex(this->frame.getNumVertices() - 4); this->face.addIndex(this->face.getNumVertices() - 2); this->face.addIndex(this->face.getNumVertices() - 1); this->face.addIndex(this->frame.getNumVertices() - 4); this->face.addIndex(this->face.getNumVertices() - 1); this->face.addIndex(this->face.getNumVertices() - 3); this->frame.addIndex(this->frame.getNumVertices() - 4); this->frame.addIndex(this->frame.getNumVertices() - 2); this->frame.addIndex(this->frame.getNumVertices() - 3); this->frame.addIndex(this->frame.getNumVertices() - 1); this->frame.addIndex(start_index + 0); this->frame.addIndex(start_index + 1); this->frame.addIndex(this->frame.getNumVertices() - 1); this->frame.addIndex(this->frame.getNumVertices() - 2); } } //-------------------------------------------------------------- void ofApp::draw() { this->cam.begin(); ofSetColor(239); this->face.draw(); ofSetColor(39); this->frame.drawWireframe(); this->cam.end(); } //-------------------------------------------------------------- int main() { ofSetupOpenGL(720, 720, OF_WINDOW); ofRunApp(new ofApp()); } |