MQL4 Reference 
Custom indicators SetIndexEmptyValue
| void SetIndexEmptyValue( |
int index, double value) |
Sets drawing line empty value.
Empty values are not drawn or shown in the DataWindow.
By default, empty value is EMPTY_VALUE.
Parameters:
| index |
- |
Line index. Must lie between 0 and 7. |
| value |
- |
New "empty" value. |
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);
//---- 0 value will not be displayed
SetIndexEmptyValue(0,0.0);
SetIndexEmptyValue(1,0.0);
//---- displaying in DataWindow
SetIndexLabel(0,"Fractal Up");
SetIndexLabel(1,"Fractal Down");
//---- initialization done
return(0);
}
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