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A chart that shows what the code I posted here is missing:
http://img261.imageshack.us/my.php?image=esempioit7.png
--- In amibroker@xxxxxxxxxxxxxxx, "awbe2005" <awbe2005@xxx> wrote:
>
> Hello guys I'd like to have this kind of zig zag retracements
>
> http://charts.dacharts.com/2008-10-12/Johnny_Chart78.png
>
>
> A code I found is this:
>
>
> _SECTION_BEGIN("ZigZag Retracement");
> function GetXSupport(Lo, Percentage, Back)
> {
> return ((BarCount - 1) - LastValue(TroughBars(Lo, Percentage,Back)));
> }
> function GetYSupport(Lo, Percentage, Back)
> {
> return (LastValue(Trough(Lo, Percentage, back)));
> }
>
> function GetXResistance(Hi, Percentage, Back)
> {
> return ((BarCount - 1) -LastValue(PeakBars(Hi, Percentage, Back)));
> }
> function GetYResistance(Hi, Percentage, Back)
> {
> return (LastValue(Peak(Hi, Percentage, Back)));
> }
>
> //////////////////////////////////////////////////////////////////
> Per = Param("Period", 5.9618, .1, 20, .001);
> Period = Param("Look back", 10, 1, BarCount-1);
> ShowRet = ParamToggle("Show Retracement values", "No|Yes",1);
> Price = ParamList("Price to follow:", "Close|High|Low", 0);
> if(Price=="Close") ZigP = Zig(C, per);
> else if(Price=="High") ZigP = Zig(H, per);
> else ZigP = Zig(L, per);
>
> //////////////////////////////////////////////////////////////////
> Plot(C, "", IIf(O>=C, colorDarkRed, colorDarkGreen), ParamStyle("Price
> Style",styleBar,maskPrice));
> Plot(ZigP, "Zig", colorGold, styleThick);
> //////////////////////////////////////////////////////////////////
>
> xs1 = GetXSupport(ZigP, .01, 1);
> xr1 = GetXResistance(ZigP, .01, 1);
> ys1 = GetYSupport(ZigP, .01, 1);
> yr1 = GetYResistance(ZigP, .01, 1);
>
> if(xs1 < xr1)
> {
> x = LineArray(xs1, ys1, BarCount - 1, LastValue(ZigP));
> Down = (yr1 - LastValue(ZigP)) / (yr1 - ys1);
> DnBars = BarCount - 1 - xr1;
> Plot(x, "", colorRed, styleDots);
> PlotText(StrFormat("%.3f (%.0f)", Down, DnBars), (xs1 + BarCount -1)/2,
> (ys1+LastValue(ZigP))/2, colorWhite);
> }
> else
> {
> x = LineArray(xr1, yr1, BarCount - 1, LastValue(ZigP));
> Up = (LastValue(ZigP) - ys1) / (yr1 - ys1);
> UpBars = BarCount - 1 - xs1;
> Plot(x, "", colorRed, styleDots);
> PlotText(StrFormat("%.3f (%.0f)", Up, UpBars), (xr1 + BarCount -1)/2,
> (yr1+LastValue(ZigP))/2, colorWhite);
> }
> Plot( 1, "", IIf( xs1 > xr1, colorGreen,
> colorRed),styleOwnScale|styleArea|styleNoLabel, -0.5, 100 );
> if(ShowRet)
> for(i=2; i<=Period+1; i++)
> {
> xs0 = GetXSupport(ZigP, .01, i);
> xs1 = GetXSupport(ZigP, .01, i-1);
> ys0 = GetYSupport(ZigP, .01, i);
> ys1 = GetYSupport(ZigP, .01, i-1);
>
> xr0 = GetXResistance(ZigP, .01, i);
> xr1 = GetXResistance(ZigP, .01, i-1);
> yr0 = GetYResistance(ZigP, .01, i);
> yr1 = GetYResistance(ZigP, .01, i-1);
>
> xs = LineArray(xs0, ys0, xs1, ys1, 0);
> Plot(xs, "", colorGold, styleLine|styleDashed);
> xr = LineArray(xr0, yr0, xr1, yr1, 0);
> Plot(xr, "", colorGold, styleLine|styleDashed);
> if(xs1 < xr1)
> {
> Up = (yr1 - ys1) / (yr0 - ys1);
> Down = (yr0 - ys1) / (yr0 - ys0);
> UpBars = xr1 - xs1;
> DnBars = xs1 - xr0;
> }
> else
> {
> Up = (yr1 - ys0) / (yr0 - ys0);
> Down = (yr1 - ys1) / (yr1 - ys0);
> UpBars = xr1 - xs0;
> DnBars = xs1 - xr1;
> }
> PlotText(StrFormat("%.3f (%.0f)", Up, UpBars), (xr1 + xr0)/2,
> (yr1+yr0)/2,
> colorWhite);
> PlotText(StrFormat("%.3f (%.0f)", Down, DnBars), (xs1 + xs0)/2,
> (ys1+ys0)/2,
> colorWhite);
> //Plot(LineArray(xs0, ys0, BarCount-1, ys0), "", colorGreen,
> styleDashed);
> //Plot(LineArray(xr0, yr0, BarCount-1, yr0), "", colorRed,
styleDashed);
>
> }
>
> str = StrFormat(" (Bars to END=%.0f)\n", BarCount - 1 - BarIndex());
> Title =FullName()+" ("+Name()+") - "+Date()+" - Open: "+O+", Hi:
> "+H+", Lo:
> "+L+", Close: "+C+StrFormat(" (%.2f %.2f%%)", C-Ref(C, -1),
> SelectedValue(ROC(C, 1)))+str;
> WriteIf(1, "\nNote Fibonacci numbers:\nPrimary numbers: 0.618, 0.786,
> 1.27 and
> 1.618","");
> WriteIf(1, "Secondary numbers: 0.382, 0.50, 1.00, 2.00, 2.24, 2.618 and
> 3.14","");
>
>
> _SECTION_END();
>
>
> But it doesn't show all of the retracements, just some.
>
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