PIXEL Width
Does anyone know of a routine that will list the amount of pixels that text on a screen would take up? It would only consist of A-Z,θ,0-9,a-z. From Str1, to Str2, pixel length in R.
Thanks!
PIXEL Width
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» Programming & Design / TI-83/84 Programming
» PIXEL Width
Summary:
On the graph Screen.
Assuming regular text(y,x,String) format, i believe most tokens take up 4 pixels in width, and spaces take up 1
For text(-1,y,x,String) each character takes up 6 pixels in width
So all you would have to do is add up the number of spaces, and add up the number of other characters, do some multiplication, and you're done!
…that is, if thats what you meant
Well, yes, but for the lower case letters, the width is different. I could take that out, but I don't think I should.
alright, then measure them! Do i really have to do it for you?
a,b,c,d,e,g,h,j,k,n,o,p,q,r,u,v,x,y = 4 pixels
i =2
f,l,s =3
m,w =6
z = 5
So what about the 17 that are not normal?
17? there is no group of 17. There is a group of 18, but that would be considered the n'ormal' group, as it is the majority
here is an algorithem for finding the number of characters in a string
:1→A String to be tested in string 1
:-1→N Number of occurrences returned in N
:Repeat A=1
:N+1→N
:1+inString(Str1,"Char",A→A
:End
so you might find all the non regular characters, (i f l spaces) and then assume the rest are regular. Multiply the numbers of each accordingly and you have your answer!
Buuut, assuming you are doing this for reasons of text wrapping, you might just want to make a conservative estimate and assume all characters are 4 pixels wide. This would reduce size greatly, and in the end, might not make much of a difference, as most of the characters are of the 4 pixel type
In many cases you can avoid doing this calculation. For example, if you just need to display something after the string, you can pass multiple arguments to Text(, e.g. Text(row,col,Str1,Str2).
If you need to display Str1 then at a later point display Str2 after it, then instead of trying to measure Str1, just display it a second time when displaying Str2, and use the method above (this is useful in custom input, for instance).
If you need to display lots of text to the screen and you want it to wrap, assign a special character to mean "wrap the string here" and use inString( and sub( to separate the text into lines. Sometimes it might save on space to pad each line of text to a fixed length with spaces, and then know that every line is 30 characters long.
You might be able to simulate the calculation builderboy describes by drawing a horizontal line under the text, writing the text, and then measuring how much of it has been erased using pxl-Test(. The process of finding the last white pixel in the line can be sped up if, instead of a For( loop, you started with a 'guess' in the middle of the screen, and adjusted the guess in increments of 24, 12, 6, 3, 1, 1. I don't know if this is going to be very fast, though, and it has to be for it to not look ugly when you do it.
I need something to look good, for a GUI editor, and need a way to make it no greater than a certain length.
Well I have something for this type of thing actually. http://www.unitedti.org/index.php?act=attach&type=post&id=2621
It will take some tweaking for you but I think it's a good program.
/forum/t-161740/pixel-width#post-
