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data coordinates thickness [message #90275]

Wed, 18 February 2015 07:46

Helder Marchetto
Messages: 520
Registered: November 2011

Senior Member

Hi,
I'm drawing objects (polygon(), ellipse(), polyline()) on an image. The image has a specific data coordinates.
I *assume* that the thickness of a line is defined in device coordinates. Is there a way to get the thickness of a line in data coordinates?
Of course an approximation would be enough.

One way, would be to use the ConvertCoord method as such:

zero = obj->ConvertCoord(0, 0, /data, /to_device)
one = obj->ConvertCoord(dataThickness, 0, /data, /to_device)
deviceThickness = one[0]-zero[0]

The assumption behind this is that the thickness is drawn in device coordinates. I guess this might be true for non zero values of the thickness (hairline) and maybe even for thicknesses of 1.

Can anybody confirm or correct the above statements?

Thanks,
Helder

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[Message index]

		data coordinates thickness By: Helder Marchetto on Wed, 18 February 2015 07:46
		Re: data coordinates thickness By: Helder Marchetto on Wed, 18 February 2015 08:27
		Re: data coordinates thickness By: chris_torrence@NOSPAM on Wed, 18 February 2015 10:15

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