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矢印群。
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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; void draw_arrow(glm::vec3 location, glm::vec3 next_location, float size, ofColor fill_color, ofColor no_fill_color); }; |
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#include "ofApp.h" //-------------------------------------------------------------- void ofApp::setup() { ofSetFrameRate(30); ofSetWindowTitle("openFrameworks"); ofBackground(39); ofEnableDepthTest(); } //-------------------------------------------------------------- void ofApp::update() { ofSeedRandom(39); } //-------------------------------------------------------------- void ofApp::draw() { this->cam.begin(); for (int y = -300; y <= 300; y += 10) { auto radius = 300; ofPushMatrix(); ofRotateY(ofRandom(360) + ofGetFrameNum() * ofRandom(1, 5)); this->draw_arrow(glm::vec3(0, y, radius), glm::vec3(1, y, radius), 30, ofColor(0), ofColor(255)); ofNoFill(); ofSetColor(255, 64); ofSetLineWidth(1); ofBeginShape(); for (int deg = 0; deg < 360; deg += 3) { ofVertex(glm::vec3((radius - 3) * cos(deg * DEG_TO_RAD), y, (radius - 3) * sin(deg * DEG_TO_RAD))); } ofEndShape(true); ofPopMatrix(); } this->cam.end(); } //-------------------------------------------------------------- void ofApp::draw_arrow(glm::vec3 location, glm::vec3 next_location, float size, ofColor fill_color, ofColor no_fill_color) { auto angle = std::atan2(next_location.y - location.y, next_location.x - location.x); ofSetColor(fill_color); ofFill(); ofBeginShape(); ofVertex(glm::vec3(size * 0.8 * cos(angle), size * 0.8 * sin(angle), 0) + location); ofVertex(glm::vec3(size * 0.5 * cos(angle + PI * 0.5), size * 0.5 * sin(angle + PI * 0.5), 0) + location); ofVertex(glm::vec3(size * 0.5 * cos(angle - PI * 0.5), size * 0.5 * sin(angle - PI * 0.5), 0) + location); ofEndShape(true); ofBeginShape(); ofVertex(glm::vec3(size * 0.5 * cos(angle + PI * 0.5), size * 0.5 * sin(angle + PI * 0.5), 0) * 0.25 + location); ofVertex(glm::vec3(size * 0.5 * cos(angle + PI * 0.5), size * 0.5 * sin(angle + PI * 0.5), 0) * 0.25 - glm::vec2(size * cos(angle), size * sin(angle)) * 0.5 + location); ofVertex(glm::vec3(size * 0.5 * cos(angle - PI * 0.5), size * 0.5 * sin(angle - PI * 0.5), 0) * 0.25 - glm::vec2(size * cos(angle), size * sin(angle)) * 0.5 + location); ofVertex(glm::vec3(size * 0.5 * cos(angle - PI * 0.5), size * 0.5 * sin(angle - PI * 0.5), 0) * 0.25 + location); ofEndShape(true); ofSetColor(no_fill_color); ofNoFill(); ofSetLineWidth(3); ofBeginShape(); ofVertex(glm::vec3(size * 0.5 * cos(angle + PI * 0.5), size * 0.5 * sin(angle + PI * 0.5), 0) * 0.25 + location); ofVertex(glm::vec3(size * 0.5 * cos(angle + PI * 0.5), size * 0.5 * sin(angle + PI * 0.5), 0) + location); ofVertex(glm::vec3(size * 0.8 * cos(angle), size * 0.8 * sin(angle), 0) + location); ofVertex(glm::vec3(size * 0.5 * cos(angle - PI * 0.5), size * 0.5 * sin(angle - PI * 0.5), 0) + location); ofVertex(glm::vec3(size * 0.5 * cos(angle - PI * 0.5), size * 0.5 * sin(angle - PI * 0.5), 0) * 0.25 + location); ofEndShape(); ofBeginShape(); ofVertex(glm::vec3(size * 0.5 * cos(angle + PI * 0.5), size * 0.5 * sin(angle + PI * 0.5), 0) * 0.25 + location); ofVertex(glm::vec3(size * 0.5 * cos(angle + PI * 0.5), size * 0.5 * sin(angle + PI * 0.5), 0) * 0.25 - glm::vec2(size * cos(angle), size * sin(angle)) * 0.5 + location); ofVertex(glm::vec3(size * 0.5 * cos(angle - PI * 0.5), size * 0.5 * sin(angle - PI * 0.5), 0) * 0.25 - glm::vec2(size * cos(angle), size * sin(angle)) * 0.5 + location); ofVertex(glm::vec3(size * 0.5 * cos(angle - PI * 0.5), size * 0.5 * sin(angle - PI * 0.5), 0) * 0.25 + location); ofEndShape(); } //-------------------------------------------------------------- int main() { ofSetupOpenGL(720, 720, OF_WINDOW); ofRunApp(new ofApp()); } |