import gab.opencv.*;

OpenCV opencv;
Histogram grayHist, rHist, gHist, bHist;

PImage img;

void setup() {
  size(640, 400);
  img = loadImage("test.jpg");
  opencv = new OpenCV(this, img);

  grayHist = opencv.findHistogram(opencv.getGray(), 256);
  rHist = opencv.findHistogram(opencv.getR(), 256);
  gHist = opencv.findHistogram(opencv.getG(), 256);
  bHist = opencv.findHistogram(opencv.getB(), 256);
}

void draw() {
  background(0);
  image(img, 10, 0, 300, 200);

  stroke(125); noFill();  
  rect(320, 10, 310, 180);
  
  fill(125); noStroke();
  grayHist.draw(320, 10, 310, 180);

  stroke(255, 0, 0); noFill();  
  rect(10, height - 190, 200, 180);
  
  fill(255, 0, 0); noStroke();
  rHist.draw(10, height - 190, 200, 180);

  stroke(0, 255, 0); noFill();  
  rect(220, height - 190, 200, 180);
  
  fill(0, 255, 0); noStroke();
  gHist.draw(220, height - 190, 200, 180);

  stroke(0, 0, 255); noFill();  
  rect(430, height - 190, 200, 180);
  
  fill(0, 0, 255); noStroke();
  bHist.draw(430, height - 190, 200, 180);
}