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Much smarter lyrics layout

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This commit is contained in:
Matthias Neeracher 2007-12-25 19:41:27 +00:00
parent 19cea3837c
commit f503e03cc3
1 changed files with 65 additions and 9 deletions
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70
Sources/VLLayout.cpp
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@ -114,22 +114,78 @@ void VLTextLayout::AddSyllable(const VLSyllable & syll, float x)
typedef std::vector<VLLayoutSyll>::iterator VLSyllIter;
#define NARROW_SPACE "\xE2\x80\x89"
#define PRE_DASH "-" NARROW_SPACE
#define POST_DASH NARROW_SPACE "-"
void VLTextLayout::DrawLine(float y)
{
if (fSyllables.empty())
return;
const float kDashW = fRegularFont->Width("-");
const float kSpaceW = fRegularFont->Width(NARROW_SPACE);
VLSyllIter syll = fSyllables.begin();
VLSyllIter end = fSyllables.end();
float nextW = fRegularFont->Width(syll->fText.c_str());
float nextX = syll->fX-0.5*nextW;
if (syll->fKind & VLSyllable::kHasPrev)
fRegularFont->Draw(nextX-fRegularFont->Width(PRE_DASH), y, PRE_DASH);
while (syll != end) {
std::string text = syll->fText;
float x = syll->fX-0.5*fRegularFont->Width(text.c_str());
if (syll == fSyllables.begin() && syll->fKind & VLSyllable::kHasPrev)
text = "-" NARROW_SPACE + text;
if (syll->fKind & VLSyllable::kHasNext)
text += NARROW_SPACE "-";
VLSyllIter next = syll+1;
float curW = nextW;
float curX = nextX;
fRegularFont->Draw(x, y, text.c_str());
while (next != end) {
nextW = fRegularFont->Width(next->fText.c_str());
nextX = next->fX-0.5*nextW;
if (next->fKind & VLSyllable::kHasPrev) {
if (curX+curW+kDashW < nextX) {
//
// Plenty of space, draw dashes
//
float dashSpace = 0.5*(nextX-curX-curW-kDashW);
fRegularFont->Draw(curX, y, text.c_str());
fRegularFont->Draw(curX+curW+dashSpace, y, "-");
++syll;
goto nextText;
} else {
//
// Fuse & continue
//
text += next->fText;
curW = fRegularFont->Width(text.c_str());
if (++next != end) {
nextW = fRegularFont->Width(next->fText.c_str());
nextX = next->fX-0.5*nextW;
}
}
} else {
if (curX+curW+kSpaceW < nextX) {
//
// Enough space, draw regular
//
fRegularFont->Draw(curX, y, text.c_str());
} else {
//
// Tight space, draw narrow & adjust
//
fNarrowFont->Draw(curX, y, text.c_str());
text += NARROW_SPACE;
nextX = std::max(nextX, curX+fNarrowFont->Width(text.c_str()));
}
goto nextText;
}
}
//
// At end of line
//
if ((end-1)->fKind & VLSyllable::kHasNext)
text += POST_DASH;
fRegularFont->Draw(curX, y, text.c_str());
nextText:
syll = next;
}
}