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四角の座標上で対の線を描写
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#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) {}; // Make Method ofPoint make_rect_point(float half_len, int deg, int z = 0); }; |
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#include "ofApp.h" //-------------------------------------------------------------- void ofApp::setup() { ofSetFrameRate(60); ofBackground(239); ofSetWindowTitle("Insta"); ofSetLineWidth(3); ofNoFill(); } //-------------------------------------------------------------- void ofApp::update() { } //-------------------------------------------------------------- void ofApp::draw() { ofTranslate(ofGetWidth() * 0.5, ofGetHeight() * 0.5); ofColor color; for (int len = 45; len < 720; len += 15) { color.setHsb(ofMap(len, 45, 720, 0, 255), 200, 200); ofSetColor(color); int deg_start = ofGetFrameNum() + len; ofBeginShape(); for (int deg = deg_start; deg < deg_start + 45; deg += 1) { ofVertex(this->make_rect_point(len, deg)); } ofEndShape(); deg_start += 180; ofBeginShape(); for (int deg = deg_start; deg < deg_start + 45; deg += 1) { ofVertex(this->make_rect_point(len, deg)); } ofEndShape(); } } //-------------------------------------------------------------- ofPoint ofApp::make_rect_point(float len, int deg, int z) { int half_len = len * 0.5; int param = (deg + 45) / 90; ofPoint point; switch (param % 4) { case 0: return ofPoint(half_len, ofMap((deg + 45) % 90, 0, 89, -half_len, half_len), z); case 1: return ofPoint(ofMap((deg + 45) % 90, 0, 89, half_len, -half_len), half_len, z); case 2: return ofPoint(-half_len, ofMap((deg + 45) % 90, 0, 89, half_len, -half_len), z); case 3: return ofPoint(ofMap((deg + 45) % 90, 0, 89, -half_len, half_len), -half_len, z); default: return ofPoint(0, 0, 0); } } //-------------------------------------------------------------- int main() { ofSetupOpenGL(720, 720, OF_WINDOW); ofRunApp(new ofApp()); } |