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/*
Rectangle Development
after: "Professional Stock Trading", M. Conway / A. Behle, 2003, pages 106, 107, 108
Edward Pottasch, nov 2004
*/
RectangleLength = 8;
RangeLength = RectangleLength * 3;
RangeFactor = 1.5;
RangeRatioLimit = 0.3;
AtrPeriod = RangeLength;
// rectangle
hg = SelectedValue(HHV(H,RectangleLength));
lw = SelectedValue(LLV(L,RectangleLength));
HeightRectangle = hg - lw;
// preceding range
hgp = SelectedValue(Ref(HHV(H,RangeLength),RectangleLength * -1));
lwp = SelectedValue(Ref(LLV(L,RangeLength),RectangleLength * -1));
HeightRangeLength = hgp - lwp;
// aspect ratio
ar = HeightRectangle / HeightRangeLength;
// ATR
at = SelectedValue(ATR(AtrPeriod));
// decide if it is a rectangle
yon = IIF(ar < RangeRatioLimit AND HeightRectangle < at * RangeFactor, 1, 0);
// visualize the rectangle
x = Cum(1);
lastx = LastValue(x);
selv = SelectedValue(x);
// the rectangle
xx = IIF(x > selv - RectangleLength AND x <= selv, x - (selv - RectangleLength),null);
yy_l = lw + 0.0 * xx;
yy_h = hg + 0.0 * xx;
Plot(yy_l, "", IIF(yon,colorBrightGreen,colorRed), IIF(yon,4,1));
Plot(yy_h, "", IIF(yon,colorBrightGreen,colorRed), IIF(yon,4,1));
// preceding range
xx = IIF(x > selv - RectangleLength - RangeLength AND x <= selv - RectangleLength, x - (selv - RectangleLength - RangeLength),null);
yy_l = lwp + 0.0 * xx;
yy_h = hgp + 0.0 * xx;
Plot(yy_l, "", colorWhite, 1);
Plot(yy_h, "", colorWhite, 1);
Plot(C,"",colorwhite,64);
"Aspect Ratio: " + writeval(ar);
"Height rectangle: " + writeval(HeightRectangle);
"ATR * Rangefactor: " + writeval(at * RangeFactor);
"Rectangle detected: " + writeif(yon," TRUE"," FALSE");
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