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feat: Pixels to Points #1364

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feat: Pixels to Points #1364

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7 changes: 7 additions & 0 deletions lib/prawn/measurement_extensions.rb
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Original file line number Diff line number Diff line change
Expand Up @@ -79,4 +79,11 @@ def ft
def pt
pt2pt(self)
end

# Convert from pixels to points.
#
# @return [Number]
def px
px2pt(self)
end
end
8 changes: 8 additions & 0 deletions lib/prawn/measurements.rb
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Expand Up @@ -124,6 +124,14 @@ def m2pt(m)
def pt2mm(pt)
pt * 1 / mm2pt(1) # (25.4 / 72)
end

# Convert pixels to points.
#
# @param px [Number]
# @return [Number]
def px2pt(px)
px * 72 / 96.0
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The number "72" comes from the PDF specification. Where does the number "96" come from?

As far as I'm aware the standard DPI seems to be 96 but DPI can be changed by the user.

end
end
end
# rubocop: enable Naming/MethodParameterName
1 change: 1 addition & 0 deletions spec/prawn/measurements_extensions_spec.rb
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Expand Up @@ -19,6 +19,7 @@
expect(1.ft).to eq(72 * 12)
expect(1.yd).to eq(72 * 12 * 3)
expect(1.pt).to eq(1)
expect(1.px).to eq(0.75)
end
end
end