GetYByValue returns distinct pixels between prices

[ninejavi]

Hello,

I'm doing an indicator that use the function GetYByValue and I don't understand the values than it returns because sometimes increments 1 pixel. With an example better:
I have TickSize of 0.25
If I call this function for some prices, the results (for example) are:
GetYByValue(1700.00) returns 100
GetYByValue(1700.25) returns 120
I say ok, the distance between ticksize's is 20 pixels, but ...
GetYByValue(1700.50) returns 140
GetYByValue(1700.75) returns 160
GetYByValue(1701.00) returns 180
GetYByValue(1701.25) returns 201 ---> Why the distance now is 21???
GetYByValue(1701.50) returns 221 -> Now is 20 pixel of distance again

The problem is the indicator, the properties of Chart, ...?

Thanks

[NinjaTrader_AlanP]

Hello ninejavi,

Thank you for your note.

It looks like this is due to rounding.

I used the following code to test, which gave an output in the screen shot.

protected override void OnRender(ChartControl chartControl, ChartScale chartScale)
{
		 
		int     yByValue = chartScale.GetYByValue(2700.00);
		int     yByValue1 = chartScale.GetYByValue(2700.25);
		int     yByValue2 = chartScale.GetYByValue(2700.50);
		int     yByValue3 = chartScale.GetYByValue(2700.75);
		int     yByValue4 = chartScale.GetYByValue(2701.00);
		int     yByValue5 = chartScale.GetYByValue(2701.25);
		int     yByValue6 = chartScale.GetYByValue(2701.50);
		int     yByValue7 = chartScale.GetYByValue(2701.75);
		 

		Print(yByValue);
		Print(yByValue1);
		Print(yByValue2);
		Print(yByValue3);
		Print(yByValue4);
		Print(yByValue5);
		Print(yByValue6);
		Print(yByValue7);
}

Please let us know if you need further assistance.

[ninejavi]

Hello NinjaTrader_AlanP, thanks for your answer.

The problem is because this function retuns pixels than are numbers without decimals?

I explain what is my problem. I use this function for calculate each price what is its y-position and then drawing a rectangle with the Volume Total on each level price. How each bar sometimes begins 1pixel more than previous, you can see a separation between some bars. I don't like how visually is it.

How can i do this? Maybe with the function GetYByValueWpf?

Thanks.

[NinjaTrader_AlanP]

Hello ninejavi,

Yes, using GetYByValueWpf would give you the pixel out to the decimal and should resolve the issue.

https://ninjatrader.com/support/helpGuides/nt8/en-us/?getybyvaluewpf.htm

Please let us know if you need further assistance.