Custom drawing tool development

[09try]

Hello, I want to create custom drawing tool. I want to click into chart and in the point where I click I want to draw line "0" which is middle line. Then I want to draw 5 lines on top of the middle line in distance +2, +5, +10, +15, +20 ticks from the middle line. Then I want to draw 5 lines underneath the middle line in distance -2, -5, -10, -15, -20 ticks from the middle line. I have managed to do it by copying Line drawing tool but the scaling seems off. Please see attached picture. Lines are on are which seems to be 6 ticks measured by another tool. I calculate y coordinate of the lines by taking y coordinate of the middle line and then adding in loop 2, 5, 10. I divide the values 2, 5, 10 by current tick size. I have also attached my code. Could you please help me? Thanks in advance

[NinjaTrader_ChelseaB]

Hello 09try,

While our support is not able to assist with custom calculations or custom logic, I can help guide you in the right direction.

Are you adding / subtracting these values from a price value or a pixel value?
Meaning are you getting the price of the anchor and adding 2?
Or you getting an x or y pixel value and adding 2 pixels?

Are you printing the price values before and after the custom calculation to ensure these are the expected values?

https://support.ninjatrader.com/s/article/Developer-Guide-Debugging-using-Print-and-TraceOrders

May I have you provide that print output saved to a text file?

[09try]

Hello Chelsea, thanks for quick reply. I take the middle point as Point startPoint = StartAnchor.GetPoint(chartControl, panel, chartScale); and then add 2 / tickSize, 5 / tickSize and so on... Here is Print output

2 Y 148.5
5 Y 136.5
10 Y 116.5
15 Y 96.5
20 Y 76.5
0 Y 156.5
-2 Y 164.5
-5 Y 176.5
-10 Y 196.5
-15 Y 216.5
-20 Y 236.5

tickSize is 0.25. 0 is middle line Y value. 2 Y is Y value of "2" = 156.5 - 2 / 0.25 = 148.5

[NinjaTrader_ChelseaB]

Hello 09try,

GetPoint() would return an x/y coordinate and not a price.

Adding ticks to an x/y coordinate value doesn't make sense as TickSize is related to price and x/y coordinates do not relate to a price.

I think you need the StartAnchor.Price to add ticks to the price, and then convert the price to an x or y coordinate value.

https://ninjatrader.com/support/helpGuides/nt8/price.htm

https://ninjatrader.com/support/helpGuides/nt8/getybyvalue.htm

[09try]

Hello Chelsea, thanks for precise advice. It looks okay now. Here is Print output

clicked price 2360.14044306497
Positive lines
d = 2
price - d = 2358.14044306497
GetYByValue(price - d) = 329
d = 5
price - d = 2355.14044306497
GetYByValue(price - d) = 355
d = 10
price - d = 2350.14044306497
GetYByValue(price - d) = 397
d = 15
price - d = 2345.14044306497
GetYByValue(price - d) = 440
d = 20
price - d = 2340.14044306497
GetYByValue(price - d) = 483
Middle line
0 Y 312
Negative lines
d = -2
price - d = 2362.14044306497
GetYByValue(price - d) = 295
d = -5
price - d = 2365.14044306497
GetYByValue(price - d) = 269
d = -10
price - d = 2370.14044306497
GetYByValue(price - d) = 227
d = -15
price - d = 2375.14044306497
GetYByValue(price - d) = 184
d = -20
price - d = 2380.14044306497
GetYByValue(price - d) = 141

and measured