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座標の配列とパラメータの配列を用意して、ランダムウォークの座標からの距離で矢印の角度を変えます。
Prepare an array of coordinates and an array of parameters, and change the angle of the arrow by the distance from the coordinates of the random walk.
[ 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 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); vector<glm::vec2> location_list; vector<float> angle_list; vector<float> param_list; }; |
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#include "ofApp.h" //-------------------------------------------------------------- void ofApp::setup() { ofSetFrameRate(60); ofSetWindowTitle("openframeworks"); ofBackground(239); ofSetLineWidth(2); ofSetRectMode(ofRectMode::OF_RECTMODE_CENTER); for (int x = -300; x <= 300; x += 20) { for (int y = -300; y <= 300; y += 20) { this->location_list.push_back(glm::vec2(x, y)); this->angle_list.push_back(0); this->param_list.push_back(0); } } } //-------------------------------------------------------------- void ofApp::update() { ofSeedRandom(39); auto noise_param = glm::vec2(ofRandom(1000), ofRandom(1000)); auto location = glm::vec2(ofMap(ofNoise(noise_param.x, ofGetFrameNum() * 0.015), 0, 1, -400, 400), ofMap(ofNoise(noise_param.y, ofGetFrameNum() * 0.015), 0, 1, -400, 400)); auto next = glm::vec2(ofMap(ofNoise(noise_param.x, (ofGetFrameNum() + 1) * 0.015), 0, 1, -400, 400), ofMap(ofNoise(noise_param.y, (ofGetFrameNum() + 1) * 0.015), 0, 1, -400, 400)); auto angle = std::atan2(next.y - location.y, next.x - location.x); for (int i = 0; i < this->location_list.size(); i++) { if (glm::distance(this->location_list[i], location) < 50) { this->angle_list[i] = angle; this->param_list[i] = 255; } this->param_list[i] = this->param_list[i] <= 2.5 ? 0 : this->param_list[i] - 2.5; } } //-------------------------------------------------------------- void ofApp::draw() { ofTranslate(ofGetWindowSize() * 0.5); for (int i = 0; i < this->location_list.size(); i++) { auto fill_color_value = this->param_list[i] > 192 ? 255 : ofMap(this->param_list[i], 0, 192, 0, 255); this->draw_arrow(this->location_list[i], this->location_list[i] + glm::vec2(cos(this->angle_list[i]), sin(this->angle_list[i])), 13, ofColor(255 - fill_color_value), ofColor(0)); } } //-------------------------------------------------------------- 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()); } |
[ Link ]
https://github.com/junkiyoshi/Insta20210708
[ Kinako ]