draw 1 cm line on any screen resolution

Asked Apr 13 '15 at 11:58

Active Apr 13 '15 at 11:58

Viewed 567 times

I want to draw exact 2cm line in javascript, I have already drawn it by using below calculations.

Screen resolution is 1366 x 768

LCD diagonal 18.5

i have calculated ppi also

ppi = (1366*1366 + 768*768) / 18.5 = 85 ppi

also pixels per cm = 85 / 2.54 = 33.46 ppcm

now if i draw a line of 33.46 pixels it will exacly equals to 1 cm, and if i draw a line 33.46 *2 pixels it will equal to 2cm.

Question : how can I draw exactly 1cm or 2cm line on any other screen who's specs are unknown to me ?

Best Regards .

asked Apr 13 '15 at 11:58

Tayyab Hussain

Impossible. You don't know the pixel density (or size) of the screen the user is using. – Cerbrus Apr 13 '15 at 12:06
is media query css3 solution ? – Tayyab Hussain Apr 13 '15 at 12:07
How would those be a solution? You don't have access to the physical size of the screen. – Cerbrus Apr 13 '15 at 12:08

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