Februar 26, 2012

Das folgende Processing Programm errechnet den am meisten vorkommenden Farbton im Such-Rechteck. Das Rechteck kann mit den den Pfeiltasten vergrössert und verkleiner werden.

// Setings
int colors = 4;
int boxWidth = 20;

// Objects
PImage img;
HashMap colorList;
ArrayList mainColors;

void setup()
{
  // Setup
  colorMode(HSB,255);
  img = loadImage("image.jpg");
  size(img.width,img.height);
}

void draw()
{
  // Draw Image
  image(img,0,0);
  
  // Load Pixels
  loadPixels();
  
  // Init Objects
  colorList = new HashMap();
  mainColors = new ArrayList();
  
  // Analyze
  for(int row=limit(mouseY-(boxWidth/2),0,img.height); row < limit(mouseY+(boxWidth/2),0,img.height); row++) {
    for(int col=limit(mouseX-(boxWidth/2),0,img.width); col < limit(mouseX+(boxWidth/2),0,img.width); col++) {
      
      // Get Info
      int i = (row*img.width)+col;
      color c = pixels[i];
      int hu = int(hue(c));
      
      // Check
      if(colorList.containsKey(hu)) {
        Increment inc = (Increment)colorList.get(hu);
        inc.plus();
      } else {
        colorList.put(hu,new Increment());
      }

    }
  }
  
  // Get Colors
  while(mainColors.size() < colors)
  {
    Iterator<Map.Entry> iterator = colorList.entrySet().iterator();
    
    int lastCount = 0;
    int bigestHue = 0;
  
    while(iterator.hasNext())
    {
      Map.Entry item = iterator.next();
      int hu = (Integer)item.getKey();
      int co = ((Increment)item.getValue()).get();
      
      if(co > lastCount) {
        bigestHue = hu;
      }
    }
    
    mainColors.add(bigestHue);
    colorList.remove(bigestHue);
  }
  
  // Update Pixels
  updatePixels();
  
  // Draw Rect
  rectMode(CENTER);
  fill(color((Integer)mainColors.get(0),255,255));
  stroke(255);
  rect(mouseX,mouseY,boxWidth,boxWidth);
}

int limit(int value, int min, int max)
{
  if(value >= min && value <= max) {
    return value;
  } else if (value > max) {
    return max;
  } else if(value < min) {
    return min;
  }
  return 0;
}

void keyPressed()
{
  switch(keyCode)
  {
    case 40: {
      boxWidth -= 5;
      break;
    }
    
    case 38: {
      boxWidth += 5;
      break;
    }
  }
}

class Increment
{
  int value;
  
  Increment() {
    this.value = 1;
  }
  
  void plus() {
   this.value++; 
  }
  
  int get() {
    return this.value;
  }
}