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黒矢印と白矢印。
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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) {}; void draw_arrow(glm::vec2 location, glm::vec2 target, float size, ofColor fill_color, ofColor no_fill_color); }; |
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#include "ofApp.h" //-------------------------------------------------------------- void ofApp::setup() { ofSetFrameRate(60); ofSetWindowTitle("openframeworks"); ofBackground(255); ofSetLineWidth(1.5); } //-------------------------------------------------------------- void ofApp::update() { ofSeedRandom(39); } //-------------------------------------------------------------- void ofApp::draw() { ofTranslate(ofGetWidth() * 0.5, ofGetHeight() * 0.5); for (int x = -320; x <= 320; x += 20) { for (int y = -320; y <= 320; y += 20) { auto deg = ofMap(ofNoise(x * 0.002, y * 0.002 + ofGetFrameNum() * 0.015), 0, 1, -360, 360); auto target = glm::vec2(x + cos(deg * DEG_TO_RAD), y + sin(deg * DEG_TO_RAD)); ofColor fill_color, no_fill_color; fill_color = deg > 0 ? ofColor(255) : ofColor(0); no_fill_color = deg > 0 ? ofColor(0) : ofColor(0); this->draw_arrow(glm::vec2(x, y), target, 10, fill_color, no_fill_color); } } } //-------------------------------------------------------------- void ofApp::draw_arrow(glm::vec2 location, glm::vec2 target, float size, ofColor fill_color, ofColor no_fill_color) { auto angle = std::atan2(target.y - location.y, target.x - location.x); ofSetColor(fill_color); ofFill(); ofBeginShape(); ofVertex(location + glm::vec2(size * cos(angle), size * sin(angle))); ofVertex(location + glm::vec2(size * 0.5 * cos(angle + PI * 0.5), size * 0.5 * sin(angle + PI * 0.5))); ofVertex(location + glm::vec2(size * 0.5 * cos(angle - PI * 0.5), size * 0.5 * sin(angle - PI * 0.5))); ofEndShape(); ofBeginShape(); ofVertex(location + glm::vec2(size * 0.5 * cos(angle + PI * 0.5), size * 0.5 * sin(angle + PI * 0.5)) * 0.25); ofVertex(location + glm::vec2(size * 0.5 * cos(angle + PI * 0.5), size * 0.5 * sin(angle + PI * 0.5)) * 0.25 - glm::vec2(size * cos(angle), size * sin(angle)) * 0.5); ofVertex(location + glm::vec2(size * 0.5 * cos(angle - PI * 0.5), size * 0.5 * sin(angle - PI * 0.5)) * 0.25 - glm::vec2(size * cos(angle), size * sin(angle)) * 0.5); ofVertex(location + glm::vec2(size * 0.5 * cos(angle - PI * 0.5), size * 0.5 * sin(angle - PI * 0.5)) * 0.25); ofEndShape(); ofSetColor(no_fill_color); ofNoFill(); ofBeginShape(); ofVertex(location + glm::vec2(size * 0.5 * cos(angle + PI * 0.5), size * 0.5 * sin(angle + PI * 0.5)) * 0.25); ofVertex(location + glm::vec2(size * 0.5 * cos(angle + PI * 0.5), size * 0.5 * sin(angle + PI * 0.5))); ofVertex(location + glm::vec2(size * cos(angle), size * sin(angle))); ofVertex(location + glm::vec2(size * 0.5 * cos(angle - PI * 0.5), size * 0.5 * sin(angle - PI * 0.5))); ofVertex(location + glm::vec2(size * 0.5 * cos(angle - PI * 0.5), size * 0.5 * sin(angle - PI * 0.5)) * 0.25); ofEndShape(); ofBeginShape(); ofVertex(location + glm::vec2(size * 0.5 * cos(angle - PI * 0.5), size * 0.5 * sin(angle - PI * 0.5)) * 0.25); ofVertex(location + glm::vec2(size * 0.5 * cos(angle - PI * 0.5), size * 0.5 * sin(angle - PI * 0.5)) * 0.25 - glm::vec2(size * cos(angle), size * sin(angle)) * 0.5); ofVertex(location + glm::vec2(size * 0.5 * cos(angle + PI * 0.5), size * 0.5 * sin(angle + PI * 0.5)) * 0.25 - glm::vec2(size * cos(angle), size * sin(angle)) * 0.5); ofVertex(location + glm::vec2(size * 0.5 * cos(angle + PI * 0.5), size * 0.5 * sin(angle + PI * 0.5)) * 0.25); ofEndShape(); } //-------------------------------------------------------------- int main() { ofSetupOpenGL(720, 720, OF_WINDOW); ofRunApp(new ofApp()); } |