Sketchbook

Calculate font size

Aproximations (1:1 images):

• 50x50: 12pt
• 100x100: 18pt
• 200x200: 36pt
• 500x500: 90pt

Aproximations (rectangular images)

• 50x100: 12pt
• 100x50: 18pt

rectangular images: font size related to width?

• 20x100: < 5 pt (taking width as reference)
• 20x100: < 18 pt (taking height as reference)

Practical example:

In an image of 100 px, text should be 80 px length (aproximately)

the length of the text is: strlen("100x100")

We are searching for 18pt (aproximately).

(100*0.80) / 7 = 11.43
(100*0.80)*1.25 / 7 = 14.28
(100*0.80)*2 / 7 = 22.86
(100*0.80)*1.5 / 7 = 17.14
(100*0.80)*1.618 / 7 = 18.49 (ceil is 18) (1.618 = Golden ratio)

using 1.618 (Golden ratio) :

50x50: (50*0.80)*1.618 / 5 = 12.94 (floor is 12)
200x200: (200*0.80)*1.618 / 7 = 36.98 (floor is 36)
500x500: (500*0.80)*1.618 / 7 = 92.46 (floor is 92)

The formula (1st version):

fontSize = imageWidth*0.80*1.618 / length("WIDTHxHEIGHT")

For rectangular images:

100x50: (100*0.80)*1.618 / 6 = 21.57 (floor is 21)

Uhmmm... with width = 100, the fot size should be 18. Let`s change the "factor"

100x50: (100*0.80)*1.618 / 7 = 18.49 (floor is 18)

So the length must be calculated using the width (strlen("100x100") = 7) The formula (2nd version):

fontSize = imageWidth*0.80*1.618 / length("WIDTHxWIDTH")