// See http://mathworld.wolfram.com/LeastSquaresFitting.html for illustration;
// we calculate vertical (or horizontal) offsets from the line rather than
// perpendicular offsets
double Utility::getPointDeviation(const VisualLine &aLine, const int x, const int y) {
// Bigger change in x than in y, nearer to horizontal than vertical
if ( abs(aLine.end.x - aLine.start.x) > abs(aLine.end.y - aLine.start.y) ) {
double lineY = getLineY(x, aLine);
return fabs(y - lineY);
}
// Perfectly vertical; no need to find where the point would hit.
// Hack.
else if (aLine.left == aLine.right) {
return abs(aLine.left - x);
}
// A line that is not perfectly vertical but is more vertical than horizontal
else {
double lineX = getLineX(y, aLine);
return fabs(x - lineX);
}
}
/**
* Draws all the characters in the text with a really
* nasty complex gritty text rendering algorithm logic stuff.
*/
void Text::draw()
{
Surface::draw();
if (_text.empty() || _font == 0)
{
return;
}
// Show text borders for debugging
if (Options::debugUi)
{
SDL_Rect r;
r.w = getWidth();
r.h = getHeight();
r.x = 0;
r.y = 0;
this->drawRect(&r, 5);
r.w-=2;
r.h-=2;
r.x++;
r.y++;
this->drawRect(&r, 0);
}
int x = 0, y = 0, line = 0, height = 0;
Font *font = _font;
int color = _color;
std::wstring *s = &_text;
for (std::vector<int>::iterator i = _lineHeight.begin(); i != _lineHeight.end(); ++i)
{
height += *i;
}
switch (_valign)
{
case ALIGN_TOP:
y = 0;
break;
case ALIGN_MIDDLE:
y = (int)ceil((getHeight() - height) / 2.0);
break;
case ALIGN_BOTTOM:
y = getHeight() - height;
break;
}
x = getLineX(line);
if (_wrap)
{
s = &_wrappedText;
}
// Set up text color
int mul = 1;
if (_contrast)
{
mul = 3;
}
// Set up text direction
int dir = 1;
if (_lang->getTextDirection() == DIRECTION_RTL)
{
dir = -1;
}
// Invert text by inverting the font palette on index 3 (font palettes use indices 1-5)
int mid = _invert ? 3 : 0;
// Draw each letter one by one
for (std::wstring::iterator c = s->begin(); c != s->end(); ++c)
{
if (Font::isSpace(*c))
{
x += dir * font->getCharSize(*c).w;
}
else if (Font::isLinebreak(*c))
{
line++;
y += font->getCharSize(*c).h;
x = getLineX(line);
if (*c == L'\x02')
{
font = _small;
}
}
else if (*c == L'\x01')
{
color = (color == _color ? _color2 : _color);
}
else
{
if (dir < 0)
x += dir * font->getCharSize(*c).w;
Surface* chr = font->getChar(*c);
chr->setX(x);
chr->setY(y);
ShaderDraw<PaletteShift>(ShaderSurface(this, 0, 0), ShaderCrop(chr), ShaderScalar(color), ShaderScalar(mul), ShaderScalar(mid));
if (dir > 0)
x += dir * font->getCharSize(*c).w;
}
}
}
int Utility::getLineX(int y, const VisualLine &aLine) {
return getLineX(y, aLine.b, aLine.a);
}