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FAQ: Calibration

Q: What is Calibration in EPV?

Calibration allows users to measure distances, perimeters, and areas using calculation markups. Once a scale is set, it is document-tied, meaning other users with shared access can also use the same scale.

Q: Who can set, edit, or delete scales?

Both primary users (document owners) and secondary users can set, edit, and delete scales under specific conditions:

  • **Primary Users** can set, use, delete, and edit scales unless another user has already applied that scale to markups.

  • **Secondary Users** can set, use, delete, and edit scales unless another user has already applied that scale to markups.

Q: What happens when no scale is set?

If no scale is set when a user attempts to use a calculation tool, a 'Set Scale' modal will appear prompting them to enter scale values.

Q: How can users set a new scale?

In the 'Set Scale' modal, users can enter:

  • **Paper Units** (e.g., inches, feet)

  • **Actual Units** (e.g., 1 inch = 5 feet)

  • **Apply Scale To:** All Pages (default), Current Page (future enhancement), or Custom (future enhancement).

Q: Can users use decimals or fractions when entering scale values?

Yes, scale values can be entered in both decimal and fractional formats.

Q: What happens when saving a scale?

  • The 'Save' button activates only when all required fields are filled.

  • Users will see a confirmation message: 'Set scale successfully.'

  • If saving fails due to network issues, users will see: 'Scale set unsuccessfully. Please try again.'

Q: What is the Dynamic Scale Modal?

Once a scale is set, a **Dynamic Scale Modal** appears in the top-right corner for easy reference. It updates in real-time and can be repositioned within the viewer.

Q: Can users add multiple scales to one document?

Yes, users can add up to **7 scales per document**. Attempting to add an 8th scale will display: 'Max 7 scales.'

Q: How can users edit a scale?

Users can edit a scale if it has NOT been used by another user. Editing a scale will **not** retroactively update previously placed markups.

Q: What happens if a user tries to delete a scale used by others?

If a scale is in use by another user, the delete icon will be disabled with a hover message: 'Scale in use by another user; edit and delete are disabled.'

Q: What are the key system messages users may encounter?

  • **Success (5 sec):** 'Scale set successfully.'

  • **Error (10 sec):** 'Scale not set. Please try again.'

  • **Deletion Success (5 sec):** 'Scale deleted successfully.'

  • **Deletion Failure (10 sec):** 'Scale not deleted. Please try again.'

  • **Disabled Icon Message:** 'Scale in use by another user; edit and delete are disabled.'

Q: What if a user tries to add an 8th scale?

They will see a help message: 'Max 7 scales.'

Q: Can a secondary user delete a scale set by the primary user?

Yes, but only if the primary user has **not** used that scale in their markups.

Q: What if a user sets a scale, but calculation tools remain disabled?

Ensure the user has saved the scale successfully. A confirmation message will appear.

Q: Can a scale be applied to specific pages instead of the whole document?

Not in the MVP. For now, scales are applied to **'All Pages'** by default.

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