getMetrics method
Calculate the width and height in pixels of a text string
Implementation
BitmapFontMetrics getMetrics(String string) {
if (string.isEmpty) {
return const BitmapFontMetrics(0, 0);
}
var width = 0;
var height = 0;
final cu = string.codeUnits;
for (var c in cu.sublist(0, cu.length - 1)) {
if (!characters.containsKey(c)) {
continue;
}
final ch = characters[c]!;
width += ch.xAdvance;
if (height < ch.height + ch.yOffset) {
height = ch.height + ch.yOffset;
}
}
final c = cu.last;
if (characters.containsKey(c)) {
final ch = characters[c]!;
width += ch.width;
if (height < ch.height + ch.yOffset) {
height = ch.height + ch.yOffset;
}
}
return BitmapFontMetrics(width, height);
}