MQL4 Reference 
Custom indicators SetIndexArrow
| void SetIndexArrow( |
int index, int code) |
Sets an arrow symbol for indicators line of the DRAW_ARROW type.
Arrow codes out of range 33 to 255 cannot be used.
Parameters:
Sample:
int init()
{
//---- 2 allocated indicator buffers
SetIndexBuffer(0,ExtUppperBuffer);
SetIndexBuffer(1,ExtLowerBuffer);
//---- drawing parameters setting
SetIndexStyle(0,DRAW_ARROW);
SetIndexArrow(0,217);
SetIndexStyle(1,DRAW_ARROW);
SetIndexArrow(1,218);
//---- displaying in the DataWindow
SetIndexLabel(0,"Fractal Up");
SetIndexLabel(1,"Fractal Down");
//---- initialization done
return(0);
}
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