[amibroker] Re: Try to understand Exemple 4 from "Using low-level graphics functions".

[pierre8rou]

>
> Where did you find Example 4 ? I only have 3 examples in "Using low
level graphics". Can you please give me the URL ...
> 

>From AB AmiBroker 5.00 User's Guide 
Chapter AmiBroker Formula Language
Last page.

Regards,

Pierre


Example 4. Low-level graphic positioning - shows how to align built-in
plots() with the low-level graphics. Note that if scale changes
(pxheight changes) due to new data or different zoom level, it needs
additional refresh to read new scale and adjust positions properly.

Plot(C, "Price", colorBlack, styleLine ); 

GfxSetOverlayMode(0); 

Miny = Status("axisminy"); 
Maxy = Status("axismaxy"); 

lvb = Status("lastvisiblebar"); 
fvb = Status("firstvisiblebar"); 

pxwidth = Status("pxwidth"); 
pxheight = Status("pxheight"); 

TotalBars = Lvb - fvb; 

axisarea = 56; // may need adjustment if you are using non-default
font for axis 

GfxSelectSolidBrush( colorRed ); 
GfxSelectPen( colorRed ); 
for( i = 0; i < TotalBars AND i < ( BarCount - fvb ); i++ ) 
{ 
   x = 5 + i * (pxwidth - axisarea - 10) / ( TotalBars + 1 ); 

   y = 5 + ( C[ i + fvb ] - Miny ) * ( pxheight - 10 )/ ( Maxy - Miny ); 

  GfxRectangle( x - 1, pxheight - y - 1, x + 2, pxheight - y + 2);
}