public float getCharacterAdvance(char curChar, char nextChar, float size) {
BitmapCharacter c = charSet.getCharacter(curChar);
if (c == null) return 0f;
float advance = size * c.getXAdvance();
advance += c.getKerning(nextChar) * size;
return advance;
}
public float getLineWidth(CharSequence text) {
// This method will probably always be a bit of a maintenance
// nightmare since it basis its calculation on a different
// routine than the Letters class. The ideal situation would
// be to abstract out letter position and size into its own
// class that both BitmapFont and Letters could use for
// positioning.
// If getLineWidth() here ever again returns a different value
// than Letters does with the same text then it might be better
// just to create a Letters object for the sole purpose of
// getting a text size. It's less efficient but at least it
// would be accurate.
// And here I am mucking around in here again...
//
// A font character has a few values that are pertinent to the
// line width:
// xOffset
// xAdvance
// kerningAmount(nextChar)
//
// The way BitmapText ultimately works is that the first character
// starts with xOffset included (ie: it is rendered at -xOffset).
// Its xAdvance is wider to accomodate that initial offset.
// The cursor position is advanced by xAdvance each time.
//
// So, a width should be calculated in a similar way. Start with
// -xOffset + xAdvance for the first character and then each subsequent
// character is just xAdvance more 'width'.
//
// The kerning amount from one character to the next affects the
// cursor position of that next character and thus the ultimate width
// and so must be factored in also.
float lineWidth = 0f;
float maxLineWidth = 0f;
char lastChar = 0;
boolean firstCharOfLine = true;
// float sizeScale = (float) block.getSize() / charSet.getRenderedSize();
float sizeScale = 1f;
for (int i = 0; i < text.length(); i++) {
char theChar = text.charAt(i);
if (theChar == '\n') {
maxLineWidth = Math.max(maxLineWidth, lineWidth);
lineWidth = 0f;
firstCharOfLine = true;
continue;
}
BitmapCharacter c = charSet.getCharacter((int) theChar);
if (c != null) {
if (theChar == '\\' && i < text.length() - 1 && text.charAt(i + 1) == '#') {
if (i + 5 < text.length() && text.charAt(i + 5) == '#') {
i += 5;
continue;
} else if (i + 8 < text.length() && text.charAt(i + 8) == '#') {
i += 8;
continue;
}
}
if (!firstCharOfLine) {
lineWidth += findKerningAmount(lastChar, theChar) * sizeScale;
} else {
// The first character needs to add in its xOffset but it
// is the only one... and negative offsets = postive width
// because we're trying to account for the part that hangs
// over the left. So we subtract.
lineWidth -= c.getXOffset() * sizeScale;
firstCharOfLine = false;
}
float xAdvance = c.getXAdvance() * sizeScale;
// If this is the last character, then we really should have
// only add its width. The advance may include extra spacing
// that we don't care about.
if (i == text.length() - 1) {
lineWidth += c.getWidth() * sizeScale;
// Since theh width includes the xOffset then we need
// to take it out again by adding it, ie: offset the width
// we just added by the appropriate amount.
lineWidth += c.getXOffset() * sizeScale;
} else {
lineWidth += xAdvance;
}
}
}
return Math.max(maxLineWidth, lineWidth);
}
private int findKerningAmount(int newLineLastChar, int nextChar) {
BitmapCharacter c = charSet.getCharacter(newLineLastChar);
if (c == null) return 0;
return c.getKerning(nextChar);
}