Utilize Paper.js PointText to Obtain Baseline Coordinates instead of Starting from the Bottom Left Corner

Check out this Paper.js sketch. Click on "TEXT" to view the bounding box. It's worth noting that I configured the leading property to match the font size, though by default it is typically 1.2 times the font size as stated in the documentation.

Why do we observe margin space at the bottom of the PointText? Is there a way to eliminate it and have the bounding box snugly fit around the text? Alternatively, how can one ascertain the y value of the true baseline of the text rather than relying on the current information provided?

UPDATE

The observed "margin" at the bottom accounts for letters with descenders, such as q and p. The actual query here is how to obtain the y-coordinate of the text's baseline in PointText. This specificity towards the baseline is crucial since another library we're integrating relies on accurate text insertion, necessitating identical placement.

javascriptspacingpaperjs

Answer №1

The alignment looks perfect. Replace "TEXT" with "Tejas" and observe how the descenders, like in the letter "j", have consistent spacing below them just like the uppercase characters.

I am uncertain if there is a method to determine the text bounds of a PointText object.

Thus, I agree with arthur.sw's recommendation as the most suitable solution. Unless dealing with basic, single-line, non-editable text, I opt for creating a textbox or textarea over the canvas and positioning it accordingly. This approach seems more sustainable in the long run; it seems unnecessary for paper to replicate everything already handled by the browser.

In this scenario, ensure the text is placed relative to the view or canvas shown. It may be beneficial to utilize globalToLocal and localToGlobal

Here is a draft that assists in understanding the correlation between an item's coordinate system and the global coordinate system.

Answer №2

If you have specific limitations, one solution could involve organizing items based on their top left positioning and consistently setting the leading to 95.5% of the FontSize. This approach should yield satisfactory results for most text.

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