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Make BitmapFont's calculation of line width match

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BitmapText's version.


git-svn-id: https://jmonkeyengine.googlecode.com/svn/trunk@8475 75d07b2b-3a1a-0410-a2c5-0572b91ccdca
This commit is contained in:
PSp..om 2011-10-21 09:07:27 +00:00
parent 1e59de25ee
commit d2579343b2
1 changed files with 35 additions and 3 deletions
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38
engine/src/core/com/jme3/font/BitmapFont.java
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@ -185,6 +185,28 @@ public class BitmapFont implements Savable {
// 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;
@ -211,17 +233,27 @@ public class BitmapFont implements Savable {
}
}
if (!firstCharOfLine){
lineWidth += c.getXOffset() * sizeScale;
lineWidth += findKerningAmount(lastChar, theChar) * sizeScale;
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
// 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;
}