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cmodule2 URecog > DynPrintLog {  
  // returns 0, 1 or 2
  int posterizeToInt(double x) {
    ret ifloor(clampZeroToOne(x)*3);
  }

  // returns 0, .5 or 1
  double posterizeInPlace(double x) {
    ret posterizeToInt(x)*.5;
  }
  
  class Cell {
    // Original image and which part we are looking at
    IIntegralImage image;
    DoubleRange xClip, yClip;

    // color transformations in place
    DoubleRange[] colorClips = new[3];

    *() {} // internal

    // make the root cell
    *(IIntegralImage *image) {
      xClip = yClip = zeroToOne();
      for i to 3: colorClips[i] = zeroToOne();
    }

    Cell copy() {
      new Cell c;
      c.image = image;
      c.xClip = xClip;
      c.colorClips = cloneArray(colorClips);
      ret c;
    }

    Rect rectInImage() {
      ret toRect_floor(doubleRectFromRanges(xClip, yClip));
    }

    // get color of cell

    double color(int channel) {
      double color = ii_averageBrightnessOfArea(image, rectInImage());
      ret transformBetweenDoubleRanges(color, colorClips[channel], zeroToOne());
    }

    int posterizedIntColor(int channel) {
      ret posterizeToInt(color(channel));
    }

    // get sub-cells

    Cell[] xSplit() {
      Cell[] cells = new[3];
      for i to 3:
        cells[i] = xSlice(i, i+1);
      ret cells;
    }

    Cell xSlice(double a, double b) {
      Cell c = copy();
      c.xClip = transformBetweenDoubleRanges(DoubleRange(a, b), zeroToOne, xClip);
      ret c;
    }
  }
}