[amibroker] Giant Candlesticks

Mon, 15 May 2006 18:14:05 -0700

Here is something fun (and maybe educational) that I wrote last
night.  It draws giant candlesticks containing normal candlesticks. 
If you zoom out enough, the giant candlesticks look pretty normal.

One thing I don't quite understand yet is what happens when you
scroll the screen left and right.  Click and hold on the left and
right arrows and you will see that the candlesticks stay in the same
place while the prices shift within, except at the far right end of
data.   ... something about how scripts are interpreted in the
indicators that I am still missing.

dan
[EMAIL PROTECTED]
-------

// Candlestick Giants
// by Daniel LaLiberte ([EMAIL PROTECTED])
// Draws candlesticks for larger periods,
// while still showing the lowest level candlesticks.

// Based on "Candlestick Periods"
// by Junya Ho ([EMAIL PROTECTED])

period = Param("Candlestick Period", 10, 1, 500, 1);
offset = Param("Candlestick Offset", 0, 0, 100, 1);

// globals reassigned by scaleCandlesticks
newO = O; newC = C; newH = H; newL = L;

function scaleCandlesticks(period, offset)
{
      // barIndex is freaky when scrolling
      //barnum = barIndex() + 1 ;
      barnum = Cum(1) + offset % period;

      delta = BarCount - barnum;
      mod = delta % period;
      //plot(mod, "mod", colorBlack, styleOwnScale);

      beginIdx = mod - period + 1;
      endIdx = mod;

      newO = Ref(O, beginIdx);
      newC = Ref(C, endIdx);
      newH = Ref(HHV(H, period), endIdx);
      newL = Ref(LLV(L, period), endIdx);
}

PlotOHLC(Open, High, Low, Close, "Price", 17, styleCandle);

scaleCandlesticks(period, offset);

openCloseMin = min(newO, newC);
openCloseMax = max(newO, newC);
boxColor = Iif(newC > newO, colorPaleGreen, colorPink);

PlotOHLC(newO, openCloseMax , openCloseMin , newC,
      "", boxColor, stylePointAndFigure ); // could use styleCloud

// following two plots are not needed with styleCloud above.
Plot(openCloseMin, WriteIf(newC > newO, "open", "close"),
      boxColor, styleStairCase );
Plot(openCloseMax, WriteIf(newC > newO, "close", "open"),
      boxColor, styleStairCase );
// Highs and lows are shown with empty box rather than a line.
Plot(newL, "low", colorBlack, styleStairCase);
Plot(newH, "high", colorBlack, styleStairCase);







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