textHeight() function

Programming Questions

clankill3r

in Programming Questions • 1 year ago

I'm trying to compute a textHeight function.

Could someone help with fine tuning, it should work a bit more corrrect with a smaller or bigger amount of text.

Also how is the height of the line spacing defined in processing? It's more then textAscent()+textDescent()

void setup() {
size(400, 400);
String txt = "rolloverProject AANLEG MINI PARK CASAolloverProject AANLEG MINI PARK CASAolloverProject AANLEG MINI PARK CASA rolloverProject AANLEG MINI PARK CASA";
textSize(24);
textAlign(LEFT, TOP);
float th = textHeight(txt, 300);
fill(255, 0, 0);
rect(20, 20, 300, th);
fill(0);
text(txt, 20, 20, 300, height);
}
float textHeight(String txt, float containerWidth) {
String[] words = split(txt, " ");
float row = 0;
float x = 0;
for(int i = 0; i < words.length; i++) {
float tw = textWidth(words[i]);
if(x + tw > containerWidth) {
x = tw;
row++;
} else {
x += tw;
}
}
float lineSpacing = (textAscent()+textDescent())/2;
return row*(textAscent()+textDescent()+lineSpacing);
}

Replies(1)

Chrisir

Re: textHeight() function

1 year ago

Hello,

I don't know anything about this.

I think

For example, adding the textAscent() and textDescent() values will give you the total height of the line.

(from http://www.processing.org/reference/textAscent_.html )

"total height of the line" meaning = the total height of the letter?

That's the spacing between lines (y direction) :
http://processing.org/reference/textLeading_.html

BTW another quote

The vertical alignment is based on the value of textAscent(), which many fonts do not specify correctly. It may be necessary to use a hack and offset by a few pixels by hand so that the offset looks correct. To do this as less of a hack, use some percentage of textAscent() or textDescent() so that the hack works even if you change the size of the font.

(from http://www.processing.org/reference/textAlign_.html )

Greetings, Chrisir

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