10 foot line, shows dash. 50 foot line, no dash. WT?

[iOne iTwo]

So I drew a 100 foot line (a property boundary),
and then tried to assign it a dashed style.

I'm aware that qcad does not have scaling for dash sizes BUT that's not what I ran into.
The line had no dash.
So I drew progressively smaller lines.
Shortlines get dashes.
Long lines apparently can't be bothered.

This held true with a layer style, and by setting the line itself.
What's going on? These lines are identical except for length

Capture - Dash.JPG (116.77 KiB) Viewed 26714 times

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Why do I care? I'm trying to draw scale architectural plans at 1:1, and use patterns for things like property boundary lines.


Version: 3.30.1.0 (3.30.1)
Build Date: Jun 18 2024

[Husky]

Toggle the Linetype mode to "Screen Based Linetypes"

https://qcad.org/doc/qcad/latest/refere ... de_en.html

[CVH]

Hi,
Several things and settings have an influence.

Toggle the Linetype mode to "Screen Based Linetypes"

What Husky means is that in Model_View we typically use 'Screen Based Linetypes'.
That is a pixel based hybrid that will always look dashed/dotted in any zoom state.
Remark that it will never be printed or exported to PDF as rendered in pixels.

Activating this can be automated:
menu Edit .. Application Preferences .. Graphics View .. Appearance .. Linetypes and Lineweights .. Auto switch to ...

ISO linetypes are typically scaled by lineweight. (See the note in the linetype file)
That behavior can be set by preference:
menu Edit .. Application Preferences .. Graphics View .. Appearance .. Linetypes and Lineweights .. Scale Linetypes patterns...

The ACAD_ISO06W100 linetype is defined as: A,24,-3,0,-3,0,-3,0,-3 or 36 long, presumed in mm.
Odd is that the dots (zeros) are rendered as short strokes using 'Screen Based Linetypes'.

NOT using 'Screen Based Linetypes' that should repeat every 36/25.4*0.25(ISO weight scale) = 0.35433" in your drawing.
Or +338 patterns for 10 feet (+1352 details), +5080 patterns for 150 feet (+20320 details).

QCAD has a preference to speed up the rendering of many dashes/dots of line patterns:
menu Edit .. Application Preferences .. Graphics View .. Appearance .. Display and Performance .. Display entities continuous...

I'm aware that qcad does not have scaling for dash sizes BUT that's not what I ran into.

Your statement is untrue.
See menu Edit .. Drawing Preference .. General .. LineType .. Global Linetype scale
See Property Editor with selection .. General Properties .. Linetype Scale (individual)
Expected is that the final scale = Global scale x Individual scale x Weight scale (if that is active).

WT... is misplaced.

Regards,
CVH