calculate canvas size dynamically

[jorgheymans]

... but always overridable via the command line parameters

[jorgheymans]

fontsize and repeat factor should be taken into consideration

[chrissimpkins]

What metrics are you using for this calculation Jorg?

[jorgheymans]

Haven't started this, I am open to suggestions

[chrissimpkins]

Want to look at the data that the fontbox.ttf library is able to access? Happy to provide some guidance if you have documentation of what is available.