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色のBlendmodeをSubtractにする。
Blend mode is subtract.
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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) {}; }; |
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#include "ofApp.h" //-------------------------------------------------------------- void ofApp::setup() { ofSetFrameRate(30); ofSetWindowTitle("openframeworks"); ofBackground(255); ofEnableBlendMode(ofBlendMode::OF_BLENDMODE_SUBTRACT); ofNoFill(); } //-------------------------------------------------------------- void ofApp::update() { } //-------------------------------------------------------------- void ofApp::draw() { ofTranslate(ofGetWindowSize() * 0.5); ofColor color; for (float radius = 20; radius <= 290; radius += 90) { for (float hue = 0; hue < 256; hue += 8) { color.setHsb(hue, 200, 255); ofSetColor(color); ofBeginShape(); for (float deg = 0; deg < 360; deg += 1) { auto base_location = glm::vec2(radius * cos(deg * DEG_TO_RAD), radius * sin(deg * DEG_TO_RAD)); auto tmp_radius = ofMap(ofNoise(base_location.x * 0.05, base_location.y * 0.05, hue * 0.0015, ofGetFrameNum() * 0.005), 0, 1, radius * 0.8, radius * 1.3); ofVertex(tmp_radius * cos(deg * DEG_TO_RAD), tmp_radius * sin(deg * DEG_TO_RAD)); } ofEndShape(true); } } } //-------------------------------------------------------------- int main() { ofSetupOpenGL(720, 720, OF_WINDOW); ofRunApp(new ofApp()); } |