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use crate::{Context, DrawOption};
use ab_glyph::ScaleFont as _;
use std::fmt;
/// Text handle for drawing text to the screen.
///
/// Text can be created and drawn with custom fonts, sizes, colors, and positions.
/// Supports text wrapping with maximum width constraints.
#[derive(Debug, Clone, PartialEq)]
pub struct Text {
pub(crate) content: String,
pub(crate) font_size: crate::Pt,
pub(crate) color: [f32; 4],
pub(crate) font_id: u32,
pub(crate) stroke_width: crate::Pt,
pub(crate) stroke_color: [f32; 4],
pub(crate) max_width: Option<crate::Pt>,
}
impl fmt::Display for Text {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
f.write_str(&self.content)
}
}
impl Text {
/// Creates a new text instance with the given content.
///
/// # Arguments
/// * `content` - The text string to display
///
/// # Example
/// ```no_run
/// # use spottedcat::Text;
/// const FONT: &[u8] = include_bytes!("../assets/DejaVuSans.ttf");
/// let font_id = spottedcat::register_font(FONT.to_vec());
/// let text = Text::new("Hello, World!", font_id);
/// ```
pub fn new(content: impl Into<String>, font_id: u32) -> Self {
Self {
content: content.into(),
font_size: crate::Pt(24.0),
color: [1.0, 1.0, 1.0, 1.0],
font_id,
stroke_width: crate::Pt(0.0),
stroke_color: [0.0, 0.0, 0.0, 1.0],
max_width: None,
}
}
/// Sets the text content safely without re-allocating the entire struct.
pub fn set_content(&mut self, content: impl Into<String>) {
self.content = content.into();
}
pub fn with_font_size(mut self, font_size: crate::Pt) -> Self {
self.font_size = font_size;
self
}
pub fn with_color(mut self, color: [f32; 4]) -> Self {
self.color = color;
self
}
pub fn with_stroke_width(mut self, stroke_width: crate::Pt) -> Self {
self.stroke_width = stroke_width;
self
}
pub fn with_stroke_color(mut self, stroke_color: [f32; 4]) -> Self {
self.stroke_color = stroke_color;
self
}
pub fn with_max_width(mut self, max_width: crate::Pt) -> Self {
self.max_width = Some(max_width);
self
}
/// Returns the font size of this text.
///
/// # Example
/// ```no_run
/// # use spottedcat::Text;
/// const FONT: &[u8] = include_bytes!("../assets/DejaVuSans.ttf");
/// let font_id = spottedcat::register_font(FONT.to_vec());
/// let text = Text::new("Hello, World!", font_id)
/// .with_font_size(spottedcat::Pt::from(32.0));
/// let font_size = text.font_size();
/// ```
pub fn font_size(&self) -> crate::Pt {
self.font_size
}
pub fn font_id(&self) -> u32 {
self.font_id
}
/// Draws this text to the context with the specified options.
///
/// # Arguments
/// * `context` - The drawing context to add this text to
/// * `options` - Text drawing options (position, font size, color, scale, font)
///
/// # Example
/// ```no_run
/// # use spottedcat::{Context, Text, DrawOption};
/// # let mut context = Context::new();
/// const FONT: &[u8] = include_bytes!("../assets/DejaVuSans.ttf");
/// let font_id = spottedcat::register_font(FONT.to_vec());
/// let opts = DrawOption::default()
/// .with_position([spottedcat::Pt::from(100.0), spottedcat::Pt::from(100.0)]);
/// Text::new("Hello, World!", font_id)
/// .with_font_size(spottedcat::Pt::from(32.0))
/// .draw(&mut context, opts);
/// ```
/// Returns the logical size of the text in pixels.
pub fn measure(&self) -> (f32, f32) {
let (w, h, _) = self.measure_with_y_offset();
(w, h)
}
/// Returns (width, height, y_offset) in pixels.
///
/// `y_offset` can be added to a top-left draw position so that the rendered glyphs' ink bounds
/// align with the measured box. This helps UI vertical centering look correct.
///
/// If max_width is set, text will be wrapped and height will account for multiple lines.
pub fn measure_with_y_offset(&self) -> (f32, f32, f32) {
use ab_glyph::{Font as _, FontArc, Glyph, PxScale, ScaleFont as _};
let font_data = match crate::get_registered_font(self.font_id) {
Some(data) => data,
None => return (0.0, 0.0, 0.0),
};
let font = match FontArc::try_from_vec(font_data) {
Ok(f) => f,
Err(_) => return (0.0, 0.0, 0.0),
};
let px_size = self.font_size.as_f32().max(1.0);
let scale = PxScale::from(px_size);
let scaled = font.as_scaled(scale);
// Handle text wrapping
let lines = self.get_wrapped_lines(&scaled);
let mut max_width = 0.0f32;
let mut total_height = 0.0f32;
let mut global_min_y = scaled.ascent();
let mut global_max_y = scaled.descent();
for line in &lines {
let line_width = self.measure_line_width(line, &scaled);
max_width = max_width.max(line_width);
// Calculate actual glyph bounds for this line (same as render_text_to_image)
let mut line_min_y = scaled.ascent();
let mut line_max_y = scaled.descent();
for ch in line.chars() {
let id = scaled.glyph_id(ch);
if let Some(glyph) = scaled.outline_glyph(Glyph {
id,
scale,
position: ab_glyph::point(0.0, 0.0),
}) {
let bounds = glyph.px_bounds();
line_min_y = line_min_y.min(bounds.min.y);
line_max_y = line_max_y.max(bounds.max.y);
}
}
let line_height = line_max_y - line_min_y;
total_height += line_height;
// Track global bounds for y_offset calculation
global_min_y = global_min_y.min(line_min_y);
global_max_y = global_max_y.max(line_max_y);
}
// y_offset should align with the baseline used in rendering
let y_offset = -global_min_y;
(max_width, total_height, y_offset)
}
/// Get wrapped lines based on max_width constraint
pub fn get_wrapped_lines(
&self,
scaled: &ab_glyph::PxScaleFont<&ab_glyph::FontArc>,
) -> Vec<String> {
if let Some(max_width) = self.max_width {
let max_w = max_width.as_f32();
if max_w <= 0.0 {
return vec![self.content.clone()];
}
let mut lines = Vec::new();
let mut current_line = String::new();
let mut current_width = 0.0f32;
let mut prev: Option<ab_glyph::GlyphId> = None;
for word in self.content.split_whitespace() {
let word_width = self.measure_word_width(word, scaled);
let space_width = scaled.h_advance(scaled.glyph_id(' '));
if current_line.is_empty() {
// First word in line
if word_width <= max_w {
current_line.push_str(word);
current_width = word_width;
// Set prev for kerning with next word
for ch in word.chars().rev().take(1) {
prev = Some(scaled.glyph_id(ch));
}
} else {
// Word is longer than max_width, break it character by character
let mut char_line = String::new();
let mut char_width = 0.0f32;
let mut char_prev: Option<ab_glyph::GlyphId> = None;
for ch in word.chars() {
let id = scaled.glyph_id(ch);
let char_w = if let Some(p) = char_prev {
scaled.kern(p, id) + scaled.h_advance(id)
} else {
scaled.h_advance(id)
};
if char_width + char_w <= max_w && !char_line.is_empty() {
char_line.push(ch);
char_width += char_w;
char_prev = Some(id);
} else if char_line.is_empty() {
char_line.push(ch);
char_width = char_w;
char_prev = Some(id);
} else {
lines.push(char_line);
char_line = ch.to_string();
char_width = char_w;
char_prev = Some(id);
}
}
if !char_line.is_empty() {
lines.push(char_line);
}
}
} else {
// Check if word fits on current line
let space_and_word_width = if let Some(p) = prev {
scaled.kern(p, scaled.glyph_id(' ')) + space_width + word_width
} else {
space_width + word_width
};
if current_width + space_and_word_width <= max_w {
// Word fits on current line
current_line.push(' ');
current_line.push_str(word);
current_width += space_and_word_width;
// Update prev for kerning
for ch in word.chars().rev().take(1) {
prev = Some(scaled.glyph_id(ch));
}
} else {
// Word doesn't fit, start new line
lines.push(current_line.clone());
current_line = word.to_string();
current_width = word_width;
// Update prev for kerning
for ch in word.chars().rev().take(1) {
prev = Some(scaled.glyph_id(ch));
}
}
}
}
if !current_line.is_empty() {
lines.push(current_line);
}
lines
} else {
// No wrapping, split by explicit newlines only
self.content.split('\n').map(|s| s.to_string()).collect()
}
}
/// Measure width of a single line
pub fn measure_line_width(
&self,
line: &str,
scaled: &ab_glyph::PxScaleFont<&ab_glyph::FontArc>,
) -> f32 {
let mut width = 0.0f32;
let mut prev: Option<ab_glyph::GlyphId> = None;
for ch in line.chars() {
let id = scaled.glyph_id(ch);
if let Some(p) = prev {
width += scaled.kern(p, id);
}
width += scaled.h_advance(id);
prev = Some(id);
}
width
}
/// Measure width of a single word (for wrapping logic)
pub fn measure_word_width(
&self,
word: &str,
scaled: &ab_glyph::PxScaleFont<&ab_glyph::FontArc>,
) -> f32 {
let mut width = 0.0f32;
let mut prev: Option<ab_glyph::GlyphId> = None;
for ch in word.chars() {
let id = scaled.glyph_id(ch);
if let Some(p) = prev {
width += scaled.kern(p, id);
}
width += scaled.h_advance(id);
prev = Some(id);
}
width
}
pub fn draw(&self, context: &mut Context, options: DrawOption) {
// Draw text at the exact position provided by the caller
// The caller is responsible for handling baseline offset if needed
context.push(crate::drawable::DrawCommand::Text(
Box::new(self.clone()),
options,
));
}
}