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StippleGen.pde
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StippleGen.pde
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/**
StippleGen_2_40
SVG Stipple Generator, v. 2.40
Copyright (C) 2016 by Windell H. Oskay, www.evilmadscientist.com
Full Documentation: http://wiki.evilmadscientist.com/StippleGen
Blog post about the release: http://www.evilmadscientist.com/go/stipple2
An implementation of Weighted Voronoi Stippling:
http://mrl.nyu.edu/~ajsecord/stipples.html
*******************************************************************************
Change Log:
v 2.4
* Compiling in Processing 3.0.1
* Add GUI option to fill circles with a spiral
v 2.3
* Forked from 2.1.1
* Fixed saving bug
v 2.20
* [Cancelled development branch.]
v 2.1.1
* Faster now, with number of stipples calculated at a time.
v 2.1.0
* Now compiling in Processing 2.0b6
* selectInput() and selectOutput() calls modified for Processing 2.
v 2.02
* Force files to end in .svg
* Fix bug that gave wrong size to stipple files saved white stipples on black background
v 2.01:
* Improved handling of Save process, to prevent accidental "not saving" by users.
v 2.0:
* Add tone reversal option (white on black / black on white)
* Reduce vertical extent of GUI, to reduce likelihood of cropping on small screens
* Speling corections
* Fixed a bug that caused unintended cropping of long, wide images
* Reorganized GUI controls
* Fail less disgracefully when a bad image type is selected.
*******************************************************************************
Program is based on the Toxic Libs Library ( http://toxiclibs.org/ )
& example code:
http://forum.processing.org/topic/toxiclib-voronoi-example-sketch
Additional inspiration:
Stipple Cam from Jim Bumgardner
http://joyofprocessing.com/blog/2011/11/stipple-cam/
and
MeshLibDemo.pde - Demo of Lee Byron's Mesh library, by
Marius Watz - http://workshop.evolutionzone.com/
Requires ControlP5 library and Toxic Libs library:
http://www.sojamo.de/libraries/controlP5/
http://bitbucket.org/postspectacular/toxiclibs/downloads/
*/
/*
* This is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* http://creativecommons.org/licenses/LGPL/2.1/
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
// You need the controlP5 library from http://www.sojamo.de/libraries/controlP5/
import controlP5.*;
//You need the Toxic Libs library: http://hg.postspectacular.com/toxiclibs/downloads
import toxi.geom.*;
import toxi.geom.mesh2d.*;
import toxi.util.datatypes.*;
import toxi.processing.*;
import javax.swing.UIManager;
import javax.swing.JFileChooser;
// helper class for rendering
ToxiclibsSupport gfx;
// Feel free to play with these three default settings
float cutoff = 0;
float minDotSize = 1.75;
float dotSizeFactor = 4;
// Max value is normally 10000. Press 'x' key to allow 50000 stipples. (SLOW)
int maxParticles = 2000;
//Scale each cell to fit in a cellBuffer-sized square window for computing the centroid.
int cellBuffer = 100;
// Display window and GUI area sizes:
int mainwidth;
int mainheight;
int borderWidth;
int ctrlheight;
int textColumnStart;
float lowBorderX;
float hiBorderX;
float lowBorderY;
float hiBorderY;
float maxDotSize;
boolean reInitiallizeArray;
boolean pausemode;
boolean fileLoaded;
boolean saveNow;
String savePath;
String[] fileOutput;
boolean fillingCircles;
String statusDisplay = "Initializing, please wait. :)";
float millisLastFrame = 0;
float frameTime = 0;
float errorTime;
String errorDisplay = "";
boolean errorDisp = false;
int generation;
int particleRouteLength;
int routeStep;
boolean invertImg;
boolean fileModeTSP;
boolean tempShowCells;
boolean showBG, showPath, showCells;
int vorPointsAdded;
boolean voronoiCalculated;
int cellsTotal, cellsCalculated, cellsCalculatedLast;
int[] particleRoute;
Vec2D[] particles;
ControlP5 cp5;
Voronoi voronoi;
Polygon2D regionList[];
PolygonClipper2D clip;
PImage img, imgload, imgblur;
void LoadImageAndScale() {
int tempx = 0;
int tempy = 0;
img = createImage(mainwidth, mainheight, RGB);
imgblur = createImage(mainwidth, mainheight, RGB);
img.loadPixels();
for (int i = 0; i < img.pixels.length; i++) {
img.pixels[i] = color(invertImg ? 0 : 255);
}
img.updatePixels();
if (!fileLoaded) {
// Load a demo image, at least until we have a "real" image to work with.
// Image from: http://commons.wikimedia.org/wiki/File:Kelly,_Grace_(Rear_Window).jpg
imgload = loadImage("grace.jpg"); // Load demo image
}
if ((imgload.width > mainwidth) || (imgload.height > mainheight)) {
if (((float)imgload.width / (float)imgload.height) > ((float)mainwidth / (float)mainheight))
{
imgload.resize(mainwidth, 0);
} else {
imgload.resize(0, mainheight);
}
}
if (imgload.height < (mainheight - 2)) {
tempy = (int)((mainheight - imgload.height) / 2) ;
}
if (imgload.width < (mainwidth - 2)) {
tempx = (int)((mainwidth - imgload.width) / 2) ;
}
img.copy(imgload, 0, 0, imgload.width, imgload.height, tempx, tempy, imgload.width, imgload.height);
// For background image!
/*
// Optional gamma correction for background image.
img.loadPixels();
float tempFloat;
float GammaValue = 1.0; // Normally in the range 0.25 - 4.0
for (int i = 0; i < img.pixels.length; i++) {
tempFloat = brightness(img.pixels[i])/255;
img.pixels[i] = color(floor(255 * pow(tempFloat,GammaValue)));
}
img.updatePixels();
*/
imgblur.copy(img, 0, 0, img.width, img.height, 0, 0, img.width, img.height);
// This is a duplicate of the background image, that we will apply a blur to,
// to reduce "high frequency" noise artifacts.
// Low-level blur filter to elminate pixel-to-pixel noise artifacts.
imgblur.filter(BLUR, 1);
imgblur.loadPixels();
}
void MainArraySetup() {
// Main particle array initialization (to be called whenever necessary):
LoadImageAndScale();
// image(img, 0, 0); // SHOW BG IMG
particles = new Vec2D[maxParticles];
// Fill array by "rejection sampling"
int i = 0;
while (i < maxParticles) {
float fx = lowBorderX + random(hiBorderX - lowBorderX);
float fy = lowBorderY + random(hiBorderY - lowBorderY);
float p = brightness(imgblur.pixels[ floor(fy)*imgblur.width + floor(fx) ])/255;
// OK to use simple floor_ rounding here, because this is a one-time operation,
// creating the initial distribution that will be iterated.
if (invertImg) {
p = 1 - p;
}
if (random(1) >= p ) {
Vec2D p1 = new Vec2D(fx, fy);
particles[i] = p1;
i++;
}
}
particleRouteLength = 0;
generation = 0;
millisLastFrame = millis();
routeStep = 0;
voronoiCalculated = false;
cellsCalculated = 0;
vorPointsAdded = 0;
voronoi = new Voronoi(); // Erase mesh
tempShowCells = true;
fileModeTSP = false;
}
void setup() {
borderWidth = 6;
mainwidth = 800;
mainheight = 600;
ctrlheight = 110;
fillingCircles = true;
size(800, 710);
gfx = new ToxiclibsSupport(this);
lowBorderX = borderWidth; //mainwidth*0.01;
hiBorderX = mainwidth - borderWidth; //mainwidth*0.98;
lowBorderY = borderWidth; // mainheight*0.01;
hiBorderY = mainheight - borderWidth; //mainheight*0.98;
int innerWidth = mainwidth - 2 * borderWidth;
int innerHeight = mainheight - 2 * borderWidth;
Rect rect = new Rect(lowBorderX, lowBorderY, innerWidth, innerHeight);
clip = new SutherlandHodgemanClipper(rect);
MainArraySetup(); // Main particle array setup
frameRate(24);
smooth();
noStroke();
fill(153); // Background fill color, for control section
textFont(createFont("SansSerif", 10));
cp5 = new ControlP5(this);
int leftcolumwidth = 225;
int guiTop = mainheight + 15;
int gui2ndRow = 4; // Spacing for firt row after group heading
int guiRowSpacing = 14; // Spacing for subsequent rows
int buttonHeight = mainheight + 19 + int(round(2.25 * guiRowSpacing));
ControlGroup l3 = cp5.addGroup("Primary controls (Changing will restart)", 10, guiTop, 225);
cp5.addSlider("sliderStipples", 10, 10000, maxParticles, 10, gui2ndRow, 150, 10)
.setGroup(l3);
cp5.addButton("buttonInvertImg", 10, 10, gui2ndRow + guiRowSpacing, 190, 10)
.setCaptionLabel("Black stipples, White Background")
.setGroup(l3);
cp5.addButton("buttonLoadFile", 10, 10, buttonHeight, 175, 10)
.setCaptionLabel("LOAD IMAGE FILE (.PNG, .JPG, or .GIF)");
cp5.addButton("buttonQuit", 10, 205, buttonHeight, 30, 10)
.setCaptionLabel("Quit");
cp5.addButton("buttonSaveStipples", 10, 25, buttonHeight + guiRowSpacing, 160, 10)
.setCaptionLabel("Save Stipple File (.SVG format)");
cp5.addButton("buttonSavePath", 10, 25, buttonHeight + 2 * guiRowSpacing, 160, 10)
.setCaptionLabel("Save \"TSP\" Path (.SVG format)");
cp5.addButton("buttonFillCircles", 10, 10, buttonHeight + 3 * guiRowSpacing, 190, 10)
.setCaptionLabel("Generate Filled circles in output");
ControlGroup l5 = cp5.addGroup("Display Options - Updated on next generation", leftcolumwidth+50, guiTop, 225);
cp5.addSlider("sliderMinDotSize", .5, 8, 2, 10, 4, 140, 10)
.setCaptionLabel("Min. Dot Size")
.setValue(minDotSize)
.setGroup(l5);
cp5.addSlider("sliderDotSizeRange", 0, 20, 5, 10, 18, 140, 10)
.setCaptionLabel("Dot Size Range")
.setValue(dotSizeFactor)
.setGroup(l5);
cp5.addSlider("sliderWhiteCutoff", 0, 1, 0, 10, 32, 140, 10)
.setCaptionLabel("White Cutoff")
.setValue(cutoff)
.setGroup(l5);
cp5.addButton("buttonImgOnOff", 10, 10, 46, 90, 10)
.setCaptionLabel("Image BG >> Hide")
.setGroup(l5);
cp5.addButton("buttonCellsOnOff", 10, 110, 46, 90, 10)
.setCaptionLabel("Cells >> Hide")
.setGroup(l5);
cp5.addButton("buttonPause", 10, 10, 60, 190, 10)
.setCaptionLabel("Pause (to calculate TSP path)")
.setGroup(l5);
cp5.addButton("buttonOrderOnOff", 10, 10, 74, 190, 10)
.setCaptionLabel("Plotting path >> shown while paused")
.setGroup(l5);
textColumnStart = 2 * leftcolumwidth + 100;
maxDotSize = getMaxDotSize(minDotSize);
saveNow = false;
showBG = false;
showPath = true;
showCells = false;
pausemode = false;
invertImg = false;
fileLoaded = false;
reInitiallizeArray = false;
}
void fileSelected(File selection) {
if (selection == null) {
println("Window was closed or the user hit cancel.");
} else {
//println("User selected " + selection.getAbsolutePath());
String loadPath = selection.getAbsolutePath();
// If a file was selected, print path to file
println("Loaded file: " + loadPath);
String[] p = splitTokens(loadPath, ".");
String ext = p[p.length - 1].toLowerCase();
boolean fileOK = false;
fileOK = fileOK || ext.equals("gif");
fileOK = fileOK || ext.equals("jpg");
fileOK = fileOK || ext.equals("tga");
fileOK = fileOK || ext.equals("png");
println("File OK: " + fileOK);
if (fileOK) {
imgload = loadImage(loadPath);
fileLoaded = true;
reInitiallizeArray = true;
} else {
// Can't load file
errorDisplay = "ERROR: BAD FILE TYPE";
errorTime = millis();
errorDisp = true;
}
}
}
void buttonLoadFile(float theValue) {
println(":::LOAD JPG, GIF or PNG FILE:::");
selectInput("Select a file to process:", "fileSelected"); // Opens file chooser
}
void buttonSavePath(float theValue) {
fileModeTSP = true;
saveSvg(0);
}
void buttonSaveStipples(float theValue) {
fileModeTSP = false;
saveSvg(0);
}
void SavefileSelected(File selection) {
if (selection == null) {
// If a file was not selected
println("No output file was selected...");
errorDisplay = "ERROR: NO FILE NAME CHOSEN.";
errorTime = millis();
errorDisp = true;
} else {
savePath = selection.getAbsolutePath();
String[] p = splitTokens(savePath, ".");
boolean fileOK = p[p.length - 1].toLowerCase().equals("svg");
if (!fileOK) savePath = savePath + ".svg";
// If a file was selected, print path to folder
println("Save file: " + savePath);
saveNow = true;
showPath = true;
errorDisplay = "SAVING FILE...";
errorTime = millis();
errorDisp = true;
}
}
void saveSvg(float theValue) {
if (!pausemode) {
buttonPause(0.0);
errorDisplay = "Error: PAUSE before saving.";
errorTime = millis();
errorDisp = true;
} else {
selectOutput("Output .svg file name:", "SavefileSelected");
}
}
void buttonQuit(float theValue) {
exit();
}
void buttonOrderOnOff(float theValue) {
Button orderOnOff = (Button)cp5.getController("buttonOrderOnOff");
if (showPath) {
showPath = false;
orderOnOff.setCaptionLabel("Plotting path >> Hide");
} else {
showPath = true;
orderOnOff.setCaptionLabel("Plotting path >> Shown while paused");
}
}
void buttonCellsOnOff(float theValue) {
Button cellsOnOff = (Button)cp5.getController("buttonCellsOnOff");
if (showCells) {
showCells = false;
cellsOnOff.setCaptionLabel("Cells >> Hide");
} else {
showCells = true;
cellsOnOff.setCaptionLabel("Cells >> Show");
}
}
void buttonImgOnOff(float theValue) {
Button imgOnOffButton = (Button)cp5.getController("buttonImgOnOff");
if (showBG) {
showBG = false;
imgOnOffButton.setCaptionLabel("Image BG >> Hide");
} else {
showBG = true;
imgOnOffButton.setCaptionLabel("Image BG >> Show");
}
}
void buttonInvertImg(float theValue) {
Slider cutoffSlider = (Slider)cp5.getController("sliderWhiteCutoff");
Button invertImgButton = (Button)cp5.getController("buttonInvertImg");
if (invertImg) {
invertImg = false;
invertImgButton.setCaptionLabel("Black stipples, White background");
cutoffSlider.setCaptionLabel("White Cutoff");
} else {
invertImg = true;
invertImgButton.setCaptionLabel("White stipples, Black background");
cutoffSlider.setCaptionLabel("Black Cutoff");
}
reInitiallizeArray = true;
pausemode = false;
}
void buttonFillCircles(float theValue) {
Button fillCircleButton = (Button)cp5.getController("buttonFillCircles");
if (fillingCircles) {
fillingCircles = false;
fillCircleButton.setCaptionLabel("Generate Open circles in output");
} else {
fillingCircles = true;
fillCircleButton.setCaptionLabel("Generate Filled circles in output");
}
}
void buttonPause(float theValue) {
// Main particle array setup (to be repeated if necessary):
Button pauseButton = (Button)cp5.getController("buttonPause");
if (pausemode) {
pausemode = false;
println("Resuming.");
pauseButton.setCaptionLabel("Pause (to calculate TSP path)");
} else {
pausemode = true;
println("Paused. Press PAUSE again to resume.");
pauseButton.setCaptionLabel("Paused (calculating TSP path)");
}
routeStep = 0;
}
boolean overRect(int x, int y, int width, int height) {
return mouseX >= x && mouseX <= x + width && mouseY >= y && mouseY <= y + height;
}
void sliderStipples(int inValue) {
if (maxParticles != inValue) {
println("Update: Stipple Count -> " + inValue);
reInitiallizeArray = true;
pausemode = false;
}
}
void sliderMinDotSize(float inValue) {
if (minDotSize != inValue) {
println("Update: sliderMinDotSize -> " + inValue);
minDotSize = inValue;
maxDotSize = getMaxDotSize(minDotSize);
}
}
void sliderDotSizeRange(float inValue) {
if (dotSizeFactor != inValue) {
println("Update: Dot Size Range -> " + inValue);
dotSizeFactor = inValue;
maxDotSize = getMaxDotSize(minDotSize);
}
}
void sliderWhiteCutoff(float inValue) {
if (cutoff != inValue) {
println("Update: White_Cutoff -> " + inValue);
cutoff = inValue;
routeStep = 0; // Reset TSP path
}
}
float getMaxDotSize(float minDotSize) {
return minDotSize * (1 + dotSizeFactor);
}
void doBackgrounds() {
if (showBG) {
image(img, 0, 0); // Show original (cropped and scaled, but not blurred!) image in background
} else {
fill(invertImg ? 0 : 255);
rect(0, 0, mainwidth, mainheight);
}
}
void optimizePlotPath() {
int temp;
// Calculate and show "optimized" plotting path, beneath points.
statusDisplay = "Optimizing plotting path";
/*
if (routeStep % 100 == 0) {
println("RouteStep:" + routeStep);
println("fps = " + frameRate );
}
*/
Vec2D p1;
if (routeStep == 0) {
float cutoffScaled = 1 - cutoff;
// Begin process of optimizing plotting route, by flagging particles that will be shown.
particleRouteLength = 0;
boolean particleRouteTemp[] = new boolean[maxParticles];
for (int i = 0; i < maxParticles; ++i) {
particleRouteTemp[i] = false;
int px = (int) particles[i].x;
int py = (int) particles[i].y;
if ((px >= imgblur.width) || (py >= imgblur.height) || (px < 0) || (py < 0)) {
continue;
}
float v = (brightness(imgblur.pixels[py * imgblur.width + px])) / 255;
if (invertImg) {
v = 1 - v;
}
if (v < cutoffScaled) {
particleRouteTemp[i] = true;
particleRouteLength++;
}
}
particleRoute = new int[particleRouteLength];
int tempCounter = 0;
for (int i = 0; i < maxParticles; ++i) {
if (particleRouteTemp[i]) {
particleRoute[tempCounter] = i;
tempCounter++;
}
}
// These are the ONLY points to be drawn in the tour.
}
if (routeStep < (particleRouteLength - 2)) {
// Nearest neighbor ("Simple, Greedy") algorithm path optimization:
int StopPoint = routeStep + 1000; // 1000 steps per frame displayed; you can edit this number!
if (StopPoint > (particleRouteLength - 1)) {
StopPoint = particleRouteLength - 1;
}
for (int i = routeStep; i < StopPoint; ++i) {
p1 = particles[particleRoute[routeStep]];
int ClosestParticle = 0;
float distMin = Float.MAX_VALUE;
for (int j = routeStep + 1; j < (particleRouteLength - 1); ++j) {
Vec2D p2 = particles[particleRoute[j]];
float dx = p1.x - p2.x;
float dy = p1.y - p2.y;
float distance = (float) (dx*dx+dy*dy); // Only looking for closest; do not need sqrt factor!
if (distance < distMin) {
ClosestParticle = j;
distMin = distance;
}
}
temp = particleRoute[routeStep + 1];
// p1 = particles[particleRoute[routeStep + 1]];
particleRoute[routeStep + 1] = particleRoute[ClosestParticle];
particleRoute[ClosestParticle] = temp;
if (routeStep < (particleRouteLength - 1)) {
routeStep++;
} else {
println("Now optimizing plot path" );
}
}
} else { // Initial routing is complete
// 2-opt heuristic optimization:
// Identify a pair of edges that would become shorter by reversing part of the tour.
for (int i = 0; i < 90000; ++i) { // 1000 tests per frame; you can edit this number.
int indexA = floor(random(particleRouteLength - 1));
int indexB = floor(random(particleRouteLength - 1));
if (Math.abs(indexA - indexB) < 2) {
continue;
}
if (indexB < indexA) { // swap A, B.
temp = indexB;
indexB = indexA;
indexA = temp;
}
Vec2D a0 = particles[particleRoute[indexA]];
Vec2D a1 = particles[particleRoute[indexA + 1]];
Vec2D b0 = particles[particleRoute[indexB]];
Vec2D b1 = particles[particleRoute[indexB + 1]];
// Original distance:
float dx = a0.x - a1.x;
float dy = a0.y - a1.y;
float distance = (float)(dx*dx+dy*dy); // Only a comparison; do not need sqrt factor!
dx = b0.x - b1.x;
dy = b0.y - b1.y;
distance += (float)(dx*dx+dy*dy); // Only a comparison; do not need sqrt factor!
// Possible shorter distance?
dx = a0.x - b0.x;
dy = a0.y - b0.y;
float distance2 = (float)(dx*dx+dy*dy); // Only a comparison; do not need sqrt factor!
dx = a1.x - b1.x;
dy = a1.y - b1.y;
distance2 += (float)(dx*dx+dy*dy); // Only a comparison; do not need sqrt factor!
if (distance2 < distance) {
// Reverse tour between a1 and b0.
int indexhigh = indexB;
int indexlow = indexA + 1;
// println("Shorten!" + frameRate );
while (indexhigh > indexlow) {
temp = particleRoute[indexlow];
particleRoute[indexlow] = particleRoute[indexhigh];
particleRoute[indexhigh] = temp;
indexhigh--;
indexlow++;
}
}
}
}
frameTime = (millis() - millisLastFrame) / 1000;
millisLastFrame = millis();
}
void doPhysics() { // Iterative relaxation via weighted Lloyd's algorithm.
int temp;
int CountTemp;
if (!voronoiCalculated) {
// Part I: Calculate voronoi cell diagram of the points.
statusDisplay = "Calculating Voronoi diagram ";
// float millisBaseline = millis(); // Baseline for timing studies
// println("Baseline. Time = " + (millis() - millisBaseline) );
if (vorPointsAdded == 0) {
voronoi = new Voronoi(); // Erase mesh
}
temp = vorPointsAdded + 500; // This line: VoronoiPointsPerPass (Feel free to edit this number.)
if (temp > maxParticles) {
temp = maxParticles;
}
for (int i = vorPointsAdded; i < temp; i++) {
// Optional, for diagnostics:::
// println("particles[i].x, particles[i].y " + particles[i].x + ", " + particles[i].y );
voronoi.addPoint(new Vec2D(particles[i].x, particles[i].y ));
vorPointsAdded++;
}
if (vorPointsAdded >= maxParticles) {
// println("Points added. Time = " + (millis() - millisBaseline) );
cellsTotal = voronoi.getRegions().size();
vorPointsAdded = 0;
cellsCalculated = 0;
cellsCalculatedLast = 0;
regionList = new Polygon2D[cellsTotal];
int i = 0;
for (Polygon2D poly : voronoi.getRegions()) {
regionList[i++] = poly; // Build array of polygons
}
voronoiCalculated = true;
}
} else { // Part II: Calculate weighted centroids of cells.
// float millisBaseline = millis();
// println("fps = " + frameRate );
statusDisplay = "Calculating weighted centroids";
temp = cellsCalculated + 500; // This line: CentroidsPerPass (Feel free to edit this number.)
// Higher values give slightly faster computation, but a less responsive GUI.
// Default value: 500
// Time/frame @ 100: 2.07 @ 50 frames in
// Time/frame @ 200: 1.575 @ 50
// Time/frame @ 500: 1.44 @ 50
if (temp > cellsTotal) {
temp = cellsTotal;
}
for (int i=cellsCalculated; i< temp; i++) {
float xMax = 0;
float xMin = mainwidth;
float yMax = 0;
float yMin = mainheight;
float xt, yt;
Polygon2D region = clip.clipPolygon(regionList[i]);
for (Vec2D v : region.vertices) {
xt = v.x;
yt = v.y;
if (xt < xMin) xMin = xt;
if (xt > xMax) xMax = xt;
if (yt < yMin) yMin = yt;
if (yt > yMax) yMax = yt;
}
float xDiff = xMax - xMin;
float yDiff = yMax - yMin;
float maxSize = max(xDiff, yDiff);
float minSize = min(xDiff, yDiff);
float scaleFactor = 1.0;
// Maximum voronoi cell extent should be between
// cellBuffer/2 and cellBuffer in size.
while (maxSize > cellBuffer) {
scaleFactor *= 0.5;
maxSize *= 0.5;
}
while (maxSize < (cellBuffer / 2)) {
scaleFactor *= 2;
maxSize *= 2;
}
if ((minSize * scaleFactor) > (cellBuffer/2)) {
// Special correction for objects of near-unity (square-like) aspect ratio,
// which have larger area *and* where it is less essential to find the exact centroid:
scaleFactor *= 0.5;
}
float StepSize = (1/scaleFactor);
float xSum = 0;
float ySum = 0;
float dSum = 0;
float PicDensity = 1.0;
if (invertImg) {
for (float x=xMin; x<=xMax; x += StepSize) {
for (float y=yMin; y<=yMax; y += StepSize) {
Vec2D p0 = new Vec2D(x, y);
if (region.containsPoint(p0)) {
// Thanks to polygon clipping, NO vertices will be beyond the sides of imgblur.
PicDensity = 0.001 + (brightness(imgblur.pixels[ round(y)*imgblur.width + round(x) ]));
xSum += PicDensity * x;
ySum += PicDensity * y;
dSum += PicDensity;
}
}
}
} else {
for (float x=xMin; x<=xMax; x += StepSize) {
for (float y=yMin; y<=yMax; y += StepSize) {
Vec2D p0 = new Vec2D(x, y);
if (region.containsPoint(p0)) {
// Thanks to polygon clipping, NO vertices will be beyond the sides of imgblur.
PicDensity = 255.001 - (brightness(imgblur.pixels[ round(y)*imgblur.width + round(x) ]));
xSum += PicDensity * x;
ySum += PicDensity * y;
dSum += PicDensity;
}
}
}
}
if (dSum > 0) {
xSum /= dSum;
ySum /= dSum;
}
Vec2D centr;
float xTemp = xSum;
float yTemp = ySum;
if ((xTemp <= lowBorderX) || (xTemp >= hiBorderX) || (yTemp <= lowBorderY) || (yTemp >= hiBorderY)) {
// If new centroid is computed to be outside the visible region, use the geometric centroid instead.
// This will help to prevent runaway points due to numerical artifacts.
centr = region.getCentroid();
xTemp = centr.x;
yTemp = centr.y;
// Enforce sides, if absolutely necessary: (Failure to do so *will* cause a crash, eventually.)
if (xTemp <= lowBorderX) xTemp = lowBorderX + 1;
if (xTemp >= hiBorderX) xTemp = hiBorderX - 1;
if (yTemp <= lowBorderY) yTemp = lowBorderY + 1;
if (yTemp >= hiBorderY) yTemp = hiBorderY - 1;
}
particles[i].x = xTemp;
particles[i].y = yTemp;
cellsCalculated++;
}
// println("cellsCalculated = " + cellsCalculated );
// println("cellsTotal = " + cellsTotal );
if (cellsCalculated >= cellsTotal) {
voronoiCalculated = false;
generation++;
println("Generation = " + generation );
frameTime = (millis() - millisLastFrame)/1000;
millisLastFrame = millis();
}
}
}
String makeSpiral ( float xOrigin, float yOrigin, float turns, float radius)
{
float resolution = 20.0;
float AngleStep = TAU / resolution;
float ScaledRadiusPerTurn = radius / (TAU * turns);
String spiralSVG = "<path d=\"M " + xOrigin + "," + yOrigin + " "; // Mark center point of spiral
float x, y;
float angle = 0;
int stopPoint = ceil (resolution * turns);
int startPoint = floor(resolution / 4); // Skip the first quarter turn in the spiral, since we have a center point already.
if (turns > 1.0) { // For small enough circles, skip the fill, and just draw the circle.
for (int i = startPoint; i <= stopPoint; i = i+1) {
angle = i * AngleStep;
x = xOrigin + ScaledRadiusPerTurn * angle * cos(angle);
y = yOrigin + ScaledRadiusPerTurn * angle * sin(angle);
spiralSVG += x + "," + y + " ";
}
}
// Last turn is a circle:
float CircleRad = ScaledRadiusPerTurn * angle;
for (int i = 0; i <= resolution; i = i+1) {
angle += AngleStep;
x = xOrigin + radius * cos(angle);
y = yOrigin + radius * sin(angle);
spiralSVG += x + "," + y + " ";
}
spiralSVG += "\" />" ;
return spiralSVG;
}
void draw() {
int i = 0;
int temp;
float dotScale = (maxDotSize - minDotSize);
float cutoffScaled = 1 - cutoff;
if (reInitiallizeArray) {
// Only change maxParticles here!
maxParticles = (int)cp5.getController("sliderStipples").getValue();
MainArraySetup();
reInitiallizeArray = false;
}
if (pausemode && !voronoiCalculated) {
optimizePlotPath();
} else {
doPhysics();
}
if (pausemode) {
doBackgrounds();