How to add centered text with gm for node (graphicsmagick/imagemagick)?

Question

This relates to the "gm" extension for node, http://aheckmann.github.io/gm/docs.html

I need to add some text centered around a bounding box (horizontally is enough). The function drawText() requires x,y coordinates, but there is no way to draw centered text.

I would otherwise need a function which can return the width of a text string in the font/size given, so I can calculate my starting x position in javascript, before calling drawText().

Answer 1

You can use the region and gravity functions this way:

gm(filePath)
    .region(WIDTH, HEIGHT, X, Y)
    .gravity('Center')
    .fill(color)
    .fontSize(textFontSize)
    .font(font)
    .drawText(0, 0, 'This text will be centered inside the region')