Device Pixels Input / Application Pixels Input

[Curerious]

Hi,

Are the following functions input x based on Device Pixels / DPI ? What is "specified x-coordinate" mean ?
- ChartControl.GetSlotIndexByX (The Document Mentioned "specified x-coordinate")
- ChartControl.GetTimeByX (The Document Mentioned "specified x-coordinate")
- ChartBars.GetBarIdxByX (The Document Mentioned "specified x-coordinate")

Are the following functions output x based on Device Pixels / DPI ? What is "chart-canvas x-coordinate" mean ?
- ChartControl.GetXByBarIndex (The Document Mentioned "chart-canvas x-coordinate")
- ChartControl.GetXByTime (The Document Mentioned "chart-canvas x-coordinate")

Thank You !

[NinjaTrader_Gaby]

Hello Curerious,

Thank you for your inquiry.

Both are referring to the same "X" - the x coordinate it's returning (or the one being supplied) is a specified point on the Chart Canvas.

From the Help Guide:

"The chart canvas represents the portion of a chart window on which objects can be painted (the area outlined in blue in the image below). The canvas area is measured by an x-axis and y-axis independent of the price and time-axis of the chart itself. When working with coordinates on a chart canvas, it is important to note that the origin point (coordinates 0,0) is in the top-left corner of the canvas, NOT the bottom-left. Moving down the canvas increases the y-coordinate, and moving the the right on the canvas increases the x-coordinate."

Below is the help guide page on Working with Chart Object coordinates for further reading.

https://ninjatrader.com/support/helpguides/nt8/working_with_chart_object_coordinates.htm

[Curerious]

Hi Gaby

Thanks for answering. I understand they are X coordinate from canvas, but there’s two types of coordinate system, one is device pixels and another is application pixels:

https://ninjatrader.com/support/helpguides/nt8/NT%20HelpGuide%20English.html?working_with_pixel_coordinates.htm

So I am wondering if the above function I provided on question is based on device pixels or application pixels?

[NinjaTrader_Gaby]

Hello Curerious,

Apologies, they are application pixels.

[Curerious]

Thank you !