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Glowing Intersection of circles.
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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) {}; int number_of_targets; vector<glm::vec2> target_list; vector<glm::vec3> color_list; ofShader shader; bool calculate_angle(glm::vec2 location_1, float radius_1, glm::vec2 location_2, float radius_2, double& theta, double& a); }; |
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#include "ofApp.h" //-------------------------------------------------------------- void ofApp::setup() { ofSetFrameRate(60); ofSetWindowTitle("openFrameworks"); ofBackground(0); ofEnableBlendMode(ofBlendMode::OF_BLENDMODE_ADD); ofSetCircleResolution(72); this->number_of_targets = 150; for (int i = 0; i < this->number_of_targets; i++) { this->target_list.push_back(glm::vec2()); this->color_list.push_back(glm::vec3(1, 1, 1)); } this->shader.load("shader/shader.vert", "shader/shader.frag"); } //-------------------------------------------------------------- void ofApp::update() { ofSeedRandom(39); } //-------------------------------------------------------------- void ofApp::draw() { ofSetColor(255); vector<pair<glm::vec2, float>> circles; circles.push_back(make_pair(glm::vec2(ofGetWidth() * 0.5, ofGetHeight() * 0.5), 250)); for (int i = 0; i < 20; i++) { auto location = glm::vec2(ofMap(ofNoise(ofRandom(1000), ofGetFrameNum() * 0.001), 0, 1, 0, ofGetWidth()), ofMap(ofNoise(ofRandom(1000), ofGetFrameNum() * 0.001), 0, 1, 0, ofGetHeight())); auto radius = ofRandom(30, 60); auto circle = make_pair(location, radius); circles.push_back(circle); } vector<glm::vec2> tmp_target_list; vector<glm::vec3> tmp_color_list; for (auto circle : circles) { int p_1 = ofRandom(3); ofNoFill(); ofDrawCircle(circle.first, circle.second); for (auto other : circles) { int p_2 = ofRandom(3); if (circle == other) { continue; } double theta, a; if (this->calculate_angle(circle.first, circle.second, other.first, other.second, theta, a)) { auto point_1 = circle.first + glm::vec2(circle.second * cos(theta + a), circle.second * sin(theta + a)); auto point_2 = circle.first + glm::vec2(circle.second * cos(theta - a), circle.second * sin(theta - a)); tmp_target_list.push_back(point_1); tmp_target_list.push_back(point_2); glm::vec3 tmp_color; switch (p_1) { case 0: tmp_color += glm::vec3(0.3, 0.2, 0.2); break; case 1: tmp_color += glm::vec3(0.2, 0.3, 0.2); break; case 2: tmp_color += glm::vec3(0.2, 0.2, 0.3); break; } switch (p_2) { case 0: tmp_color += glm::vec3(0.3, 0.2, 0.2); break; case 1: tmp_color += glm::vec3(0.2, 0.3, 0.2); break; case 2: tmp_color += glm::vec3(0.2, 0.2, 0.3); break; } tmp_color_list.push_back(tmp_color); } } } for (int i = 0; i < this->number_of_targets; i++) { if (i < tmp_target_list.size()) { this->target_list[i] = tmp_target_list[i]; this->color_list[i] = tmp_color_list[i / 2]; } else { this->target_list[i] = glm::vec2(); this->color_list[i] = glm::vec3(); } } ofFill(); this->shader.begin(); this->shader.setUniform1f("time", ofGetElapsedTimef()); this->shader.setUniform2f("resolution", ofGetWidth(), ofGetHeight()); this->shader.setUniform2fv("targets", &this->target_list[0].x, this->number_of_targets); this->shader.setUniform3fv("colors", &this->color_list[0].x, this->number_of_targets); ofDrawRectangle(0, 0, ofGetWidth(), ofGetHeight()); this->shader.end(); } //-------------------------------------------------------------- bool ofApp::calculate_angle(glm::vec2 location_1, float radius_1, glm::vec2 location_2, float radius_2, double& theta, double& a) { auto distance = glm::distance(location_1, location_2); if (distance > radius_1 + radius_2 || distance < radius_1 - radius_2) { return false; } theta = atan2(location_2.y - location_1.y, location_2.x - location_1.x); auto cos_a = (pow(distance, 2) + pow(radius_1, 2) - pow(radius_2, 2)) / (2 * distance * radius_1); a = acos(cos_a); return true; } //-------------------------------------------------------------- int main() { ofGLWindowSettings settings; settings.setGLVersion(3, 2); settings.setSize(720, 720); ofCreateWindow(settings); ofRunApp(new ofApp()); } |
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#version 150 uniform mat4 modelViewProjectionMatrix; in vec4 position; void main(){ gl_Position = modelViewProjectionMatrix * position; } |
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#version 150 const int number_of_targets = 150; uniform float time; uniform vec2 resolution; uniform vec2 targets[number_of_targets]; uniform vec3 colors[number_of_targets]; out vec4 outputColor; void main() { vec2 p = (gl_FragCoord.xy * 2.0 - resolution) / min(resolution.x, resolution.y); vec3 color = vec3(0.0); for(int i = 0; i < number_of_targets; i++){ vec2 t = vec2(targets[i].x, -targets[i].y) / min(resolution.x, resolution.y) * 2.0; t.xy += vec2(-resolution.x, resolution.y) / min(resolution.x, resolution.y); float v = 0.035 / length(p - t); float r = v * colors[i].x; float g = v * colors[i].y; float b = v * colors[i].z; vec3 c = vec3(smoothstep(0.05, 1.0, r), smoothstep(0.05, 1.0, g), smoothstep(0.05, 1.0, b)); color += c; } outputColor = vec4(color, 1.0); } |