black hole

Made in openFrameworks

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#include "ofMain.h"
#include "ofApp.h"

//========================================================================
int main() {
	ofSetupOpenGL(1500, 1500, OF_WINDOW);			// <-------- setup the GL context

	// this kicks off the running of my app
	// can be OF_WINDOW or OF_FULLSCREEN
	// pass in width and height too:
	ofRunApp(new ofApp());

}

#pragma once

#include "ofMain.h"

class ofApp : public ofBaseApp {

public:
	void setup();
	void update();
	void draw();

	vector<float>noiseSeeds;
	float angleStep, stepSize, radius, sp;
	int sunLocX, sunLocY, totalRays;
	int cRad, nMax;

	void keyPressed(int key);




};

#include "ofApp.h"

// Made by Zoe Caudron, @life.as.a.plant
// Inspired by Roni Kaufman's sketch, https://openprocessing.org/sketch/792407


//--------------------------------------------------------------
void ofApp::setup() {
	ofSetBackgroundAuto(false);
	ofSetFrameRate(60);
	ofBackground(255);
	ofSetCircleResolution(100);
	totalRays = 15;
	sp = 0.0009;
	stepSize = 0;
	radius = 100;
	cRad = 105;
	nMax = 0;
	angleStep = 360.0 / totalRays;
	sunLocX = ofGetWidth() / 2;
	sunLocY = ofGetHeight() / 2;
	ofNoFill();
	for (int i = 0; i < totalRays; i++) {
		noiseSeeds.push_back(ofRandom(10000));
	}


}

//--------------------------------------------------------------
void ofApp::update() {
	radius += sp; //if you want an increase of the spacing
//	radius += 1;  //if you want the circles evenly spaced
	stepSize += 3;  //increase of the noisiness
	nMax += 1;
	//	cRad += 1;

	if (radius > 350) {
		nMax = 300; //helps stop the sketch whilst keeping the same effect
	}

	if (stepSize > 350) {
		nMax = 300;
	}
	sp += sp / 4;
}

//--------------------------------------------------------------
void ofApp::draw() {


	ofPushMatrix();
	ofPushStyle();
	ofTranslate(sunLocX, sunLocY);
	ofSetColor(0, 3);

		//for (int r = 105; r < 110; r+=2) {  // if you want a well defined, brighter center circle - kinda patchy but does the job
		//	ofPushStyle();
		//	ofSetColor(0, 2);
		//	ofDrawCircle(0, 0, r);
		//	ofPopStyle();
		//}


	ofBeginShape();  // now this a bit tricky, and taken from Goldsmith's tutor, Theo P. The beginShape/endShape doesn't fully close with the noise, creating unpleasant artifacts.
					 // This helps fully close the shape. Probably not optimal but I need to spend more time figuring that out

	ofPoint end;
	float nRad = radius + ofNoise(noiseSeeds[noiseSeeds.size() - 1]) * stepSize;
	end.x = cos(ofDegToRad(angleStep*noiseSeeds.size() - 1)) * nRad;
	end.y = sin(ofDegToRad(angleStep*noiseSeeds.size() - 1)) * nRad;
	ofCurveVertex(end);

	for (int c = nMax; c < 300; c++) {

		for (int i = 0; i < totalRays; i++)
		{
			ofPoint end;
			float nRad = radius + ofNoise(noiseSeeds[i]) * stepSize;
			end.x = cos(ofDegToRad(angleStep*i)) * nRad;
			end.y = sin(ofDegToRad(angleStep*i)) * nRad;
			noiseSeeds[i] += 0.01;
			ofCurveVertex(end);


		}

	}

	nRad = radius + ofNoise(noiseSeeds[0]) * stepSize;
	end.x = cos(ofDegToRad(angleStep * 0)) * nRad;
	end.y = sin(ofDegToRad(angleStep * 0)) * nRad;
	ofCurveVertex(end);


	nRad = radius + ofNoise(noiseSeeds[1]) * stepSize;
	end.x = cos(ofDegToRad(angleStep * 1)) * nRad;
	end.y = sin(ofDegToRad(angleStep * 1)) * nRad;
	ofCurveVertex(end);


	ofEndShape(true);
	ofPopStyle();
	ofPopMatrix();


}

//--------------------------------------------------------------
void ofApp::keyPressed(int key) {
	if (key == 's') {
		glReadBuffer(GL_FRONT);
		ofSaveScreen(ofToString(ofGetFrameNum()) + ".jpg");  //to save the final image in your project folder
	}

	if (key == 'r') { //resets the sketch - useful when doing a screengrab/recording!
		setup();
	}
}