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四角生成
Generate rect.
[ 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) {}; glm::vec2 make_point(int len, int param); float start_param; ofColor color; }; |
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#include "ofApp.h" //-------------------------------------------------------------- void ofApp::setup() { ofSetFrameRate(60); ofSetWindowTitle("openFrameworks"); ofBackground(39); ofSetLineWidth(5); this->start_param = ofRandom(100, 200); } //-------------------------------------------------------------- void ofApp::update() { if (ofGetFrameNum() % 100 == 0) { this->start_param += ofRandom(25, 50); this->color.setHsb(this->color.getHue() + ofRandom(10, 30), 255, 255); } } //-------------------------------------------------------------- void ofApp::draw() { ofTranslate(ofGetWidth() * 0.5, ofGetHeight() * 0.5); auto len = 500; auto width = ofGetFrameNum() % 100; vector<glm::vec2> vertices; for (auto param = this->start_param - width * 0.5; param <= this->start_param + width * 0.5; param++) { vertices.push_back(this->make_point(len, param)); } ofFill(); ofSetColor(this->color, 64); ofBeginShape(); ofVertices(vertices); ofEndShape(true); ofNoFill(); ofSetColor(this->color); ofBeginShape(); ofVertices(vertices); ofEndShape(true); } //-------------------------------------------------------------- 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)); } } //-------------------------------------------------------------- int main() { ofSetupOpenGL(720, 720, OF_WINDOW); ofRunApp(new ofApp()); } |
[ Link ]
https://github.com/junkiyoshi/openframeworks20190831