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四角い虹。
Rainbow rectangle.
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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); ofEasyCam cam; ofMesh face, line; }; |
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#include "ofApp.h" //-------------------------------------------------------------- void ofApp::setup() { ofSetFrameRate(30); ofSetWindowTitle("openframeworks"); ofBackground(0); ofSetLineWidth(2); ofEnableDepthTest(); this->line.setMode(ofPrimitiveMode::OF_PRIMITIVE_LINES); } //-------------------------------------------------------------- void ofApp::update() { this->face.clear(); this->line.clear(); int len = 300; int width = 50; ofColor color; for (int y = -300; y <= 300; y += width) { int start_param = ofMap(ofNoise(y * 0.008, ofGetFrameNum() * 0.0035), 0, 1, 0, 720); int end_param = start_param + 70; color.setHsb(ofMap(y, -300, 300, 0, 255), 230, 255); int line_start_index = this->line.getNumVertices(); for (int param = start_param; param <= end_param; param++) { vector<glm::vec3> vertices; vertices.push_back(glm::vec3(this->make_point(len, param), width * 0.5 + y)); vertices.push_back(glm::vec3(this->make_point(len, param), width * -0.5 + y)); this->face.addVertices(vertices); this->line.addVertices(vertices); this->face.addColor(color); this->face.addColor(color); this->line.addColor(ofColor(255)); this->line.addColor(ofColor(255)); if (param > start_param) { this->face.addIndex(this->face.getNumVertices() - 1); this->face.addIndex(this->face.getNumVertices() - 2); this->face.addIndex(this->face.getNumVertices() - 4); this->face.addIndex(this->face.getNumVertices() - 1); this->face.addIndex(this->face.getNumVertices() - 3); this->face.addIndex(this->face.getNumVertices() - 4); this->line.addIndex(this->line.getNumVertices() - 1); this->line.addIndex(this->line.getNumVertices() - 3); this->line.addIndex(this->line.getNumVertices() - 2); this->line.addIndex(this->line.getNumVertices() - 4); } } this->line.addIndex(this->line.getNumVertices() - 1); this->line.addIndex(this->line.getNumVertices() - 2); this->line.addIndex(line_start_index); this->line.addIndex(line_start_index + 1); } } //-------------------------------------------------------------- void ofApp::draw() { this->cam.begin(); ofRotateY(ofGetFrameNum() * 1.333333333333); this->face.draw(); this->line.drawWireframe(); this->cam.end(); } //-------------------------------------------------------------- glm::vec2 ofApp::make_point(int len, int param) { param = param % 100; if (param < 25) { return glm::vec2(ofMap(param, 0, 25, -len, len), -len * 0.5); } else if (param < 50) { return glm::vec2(len, ofMap(param, 25, 50, -len * 0.5, len * 0.5)); } else if (param < 75) { return glm::vec2(ofMap(param, 50, 75, len, -len), len * 0.5); } else { return glm::vec2(-len, ofMap(param, 75, 100, len * 0.5, -len * 0.5)); } } //-------------------------------------------------------------- int main() { ofSetupOpenGL(720, 720, OF_WINDOW); ofRunApp(new ofApp()); } |