pub fn layout_glyphs(
        &mut self,
        gfx: &mut Graphics,
        text: &str,
        max_width: Option<f32>,
        mut callback: impl FnMut(&mut Graphics, LayoutGlyph),
    ) -> crate::Result<Vector> {
        let mut cursor = Vector::ZERO;
        let mut extents = Vector::ZERO;
        let space_glyph = self.0.font().single_glyph(' ');
        let space_metrics = self.0.font().metrics(space_glyph);
        let mut glyphs = Vec::new();
        let line_height = self.0.font().line_height();

        for line in text.split('\n') {
            for word in line.split(' ') {
                match self.0.cache_string(word) {
                    Ok(()) => {}
                    Err(CacheError::OutOfSpace) => {
                        // If the cache is out of space, clear it and insert a new page
                        self.0.replace_texture(FontImage::new(&gfx)?);
                    }
                    Err(CacheError::NonRenderableGlyph(g)) => {
                        return Err(FontError::NonRenderableGlyph(g).into());
                    }
                    Err(CacheError::TextureTooSmall) => {
                        return Err(FontError::StringTooLarge.into());
                    }
                }
                // Retrieve the glyphs from the font
                glyphs.extend(
                    self.0.render_string(word).map(|glyph| {
                        glyph.expect("A character failed to be rendered unexpectedly")
                    }),
                );

                // If we're word wrapping, look ahead to the total width of the word. In the case
                // where the word would overflow the line, move down a line
                if let Some(width) = max_width {
                    let mut word_width = 0.0;
                    let mut it = glyphs.iter().peekable();
                    while let Some((metrics, glyph)) = it.next() {
                        word_width += metrics.advance_x;
                        // If there's a next glyph, try kerning
                        if let Some((_, next)) = it.peek() {
                            word_width += self.0.font().kerning(glyph.glyph, next.glyph)
                        }
                    }
                    if cursor.x + word_width > width {
                        cursor.x = 0.0;
                        cursor.y += line_height;
                    }
                }

                // Send each glyph to the callback
                let mut it = glyphs.drain(..).peekable();
                while let Some((metrics, glyph)) = it.next() {
                    let glyph_position = metrics
                        .bounds
                        .map_or(Vector::ZERO, |b| Vector::new(b.x as f32, b.y as f32));

                    callback(
                        gfx,
                        LayoutGlyph {
                            position: cursor + glyph_position,
                            glyph,
                            image: self.0.texture().image.clone(),
                        },
                    );

                    let bounds = Vector::new(glyph.bounds.width as f32, glyph.bounds.height as f32);
                    extents = extents.max(cursor + glyph_position + bounds);

                    cursor.x += metrics.advance_x;
                    // If there's a next glyph, try kerning
                    if let Some((_, next)) = it.peek() {
                        cursor.x += self.0.font().kerning(glyph.glyph, next.glyph)
                    }
                }
                cursor.x += space_metrics.advance_x;
            }
            cursor.x = 0.0;
            cursor.y += line_height;

            extents = extents.max(cursor);
        }

        Ok(extents)
    }
/// Lay out the given text at a given font size, with a given maximum width, returning its
/// extents
///
/// Each glyph (and the font) is passed into the callback as it is layed out, giving the option
/// to render right away, examine and move on, etc.
Lay out the given text at a given font size, with a given maximum width, returning its
extents

Each glyph (and the font) is passed into the callback as it is layed out, giving the option
to render right away, examine and move on, etc.
Lay out the given text at a given font size with a given maximum width returning its extents Each glyph ( and the font ) is passed into the callback as it is layed out giving the option to render right away examine and move on etc .
pub fn layout_glyphs(
        &mut self,
        gfx: &mut Graphics,
        text: &str,
        max_width: Option<f32>,
        mut callback: impl FnMut(&mut Graphics, LayoutGlyph),
    ) -> crate::Result<Vector> {
        let mut cursor = Vector::ZERO;
        let mut extents = Vector::ZERO;
        let space_glyph = self.0.font().single_glyph(' ');
        let space_metrics = self.0.font().metrics(space_glyph);
        let mut glyphs = Vec::new();
        let line_height = self.0.font().line_height();
        for line in text.split('\n') {
            for word in line.split(' ') {
                match self.0.cache_string(word) {
                    Ok(()) => {}
                    Err(CacheError::OutOfSpace) => {
                        // If the cache is out of space, clear it and insert a new page
                        self.0.replace_texture(FontImage::new(&gfx)?);
                    }
                    Err(CacheError::NonRenderableGlyph(g)) => {
                        return Err(FontError::NonRenderableGlyph(g).into());
                    }
                    Err(CacheError::TextureTooSmall) => {
                        return Err(FontError::StringTooLarge.into());
                    }
                }
                // Retrieve the glyphs from the font
                glyphs.extend(
                    self.0.render_string(word).map(|glyph| {
                        glyph.expect("A character failed to be rendered unexpectedly")
                    }),
                );
                // If we're word wrapping, look ahead to the total width of the word. In the case
                // where the word would overflow the line, move down a line
                if let Some(width) = max_width {
                    let mut word_width = 0.0;
                    let mut it = glyphs.iter().peekable();
                    while let Some((metrics, glyph)) = it.next() {
                        word_width += metrics.advance_x;
                        // If there's a next glyph, try kerning
                        if let Some((_, next)) = it.peek() {
                            word_width += self.0.font().kerning(glyph.glyph, next.glyph)
                        }
                    }
                    if cursor.x + word_width > width {
                        cursor.x = 0.0;
                        cursor.y += line_height;
                    }
                }
                // Send each glyph to the callback
                let mut it = glyphs.drain(..).peekable();
                while let Some((metrics, glyph)) = it.next() {
                    let glyph_position = metrics
                        .bounds
                        .map_or(Vector::ZERO, |b| Vector::new(b.x as f32, b.y as f32));
                    callback(
                        gfx,
                        LayoutGlyph {
                            position: cursor + glyph_position,
                            glyph,
                            image: self.0.texture().image.clone(),
                        },
                    );
                    let bounds = Vector::new(glyph.bounds.width as f32, glyph.bounds.height as f32);
                    extents = extents.max(cursor + glyph_position + bounds);
                    cursor.x += metrics.advance_x;
                    // If there's a next glyph, try kerning
                    if let Some((_, next)) = it.peek() {
                        cursor.x += self.0.font().kerning(glyph.glyph, next.glyph)
                    }
                }
                cursor.x += space_metrics.advance_x;
            }
            cursor.x = 0.0;
            cursor.y += line_height;
            extents = extents.max(cursor);
        }
        Ok(extents)
    }
pub fn layout_glyphs ( & mut self , gfx : & mut Graphics , text : & str , max_width : Option < f32 > , mut callback : impl FnMut ( & mut Graphics , LayoutGlyph ) , ) -> crate :: Result < Vector > { let mut cursor = Vector :: ZERO ; let mut extents = Vector :: ZERO ; let space_glyph = self . 0 . font ( ) . single_glyph ( ' ' ) ; let space_metrics = self . 0 . font ( ) . metrics ( space_glyph ) ; let mut glyphs = Vec :: new ( ) ; let line_height = self . 0 . font ( ) . line_height ( ) ; for line in text . split ( '\n' ) { for word in line . split ( ' ' ) { match self . 0 . cache_string ( word ) { Ok ( ( ) ) => { } Err ( CacheError :: OutOfSpace ) => { // If the cache is out of space, clear it and insert a new page self . 0 . replace_texture ( FontImage :: new ( & gfx ) ? ) ; } Err ( CacheError :: NonRenderableGlyph ( g ) ) => { return Err ( FontError :: NonRenderableGlyph ( g ) . into ( ) ) ; } Err ( CacheError :: TextureTooSmall ) => { return Err ( FontError :: StringTooLarge . into ( ) ) ; } } // Retrieve the glyphs from the font glyphs . extend ( self . 0 . render_string ( word ) . map ( | glyph | { glyph . expect ( " " ) } ) , ) ; // If we're word wrapping, look ahead to the total width of the word. In the case // where the word would overflow the line, move down a line if let Some ( width ) = max_width { let mut word_width = 0.0 ; let mut it = glyphs . iter ( ) . peekable ( ) ; while let Some ( ( metrics , glyph ) ) = it . next ( ) { word_width += metrics . advance_x ; // If there's a next glyph, try kerning if let Some ( ( _ , next ) ) = it . peek ( ) { word_width += self . 0 . font ( ) . kerning ( glyph . glyph , next . glyph ) } } if cursor . x + word_width > width { cursor . x = 0.0 ; cursor . y += line_height ; } } // Send each glyph to the callback let mut it = glyphs . drain ( .. ) . peekable ( ) ; while let Some ( ( metrics , glyph ) ) = it . next ( ) { let glyph_position = metrics . bounds . map_or ( Vector :: ZERO , | b | Vector :: new ( b . x as f32 , b . y as f32 ) ) ; callback ( gfx , LayoutGlyph { position : cursor + glyph_position , glyph , image : self . 0 . texture ( ) . image . clone ( ) , } , ) ; let bounds = Vector :: new ( glyph . bounds . width as f32 , glyph . bounds . height as f32 ) ; extents = extents . max ( cursor + glyph_position + bounds ) ; cursor . x += metrics . advance_x ; // If there's a next glyph, try kerning if let Some ( ( _ , next ) ) = it . peek ( ) { cursor . x += self . 0 . font ( ) . kerning ( glyph . glyph , next . glyph ) } } cursor . x += space_metrics . advance_x ; } cursor . x = 0.0 ; cursor . y += line_height ; extents = extents . max ( cursor ) ; } Ok ( extents ) }
Lay out the given text at a given font size, with a given maximum width, returning its
extents
Lay out the given text at a given font size with a given maximum width returning its extents
&mut self
gfx
&mut Graphics
text
&str
max_width
Option<f32>
callback
impl FnMut(&mut Graphics, LayoutGlyph)
&mut self
gfx
&mut Graphics
text
&str
max_width
Option<f32>
callback
impl FnMut(&mut Graphics, LayoutGlyph)