better line wrap for level descriptions

src/main.rs

@@ -32,6 +32,7 @@ struct Game {
 	selected_level: usize,
 	selected_solution: usize,
 	editing_solution_name: bool,
+	level_desc_text: ShapedText,
 }
 
 fn main() {
@@ -71,6 +72,7 @@ impl Game {
 			selected_level: 0,
 			selected_solution,
 			editing_solution_name: false,
+			level_desc_text: ShapedText::new(20),
 		}
 	}
 
@@ -181,10 +183,11 @@ impl Game {
 			d.draw_text(level.id(), level_list_width + 10, 50, 10, Color::GRAY);
 
 			let mut y = 70;
-			for line in level.description().lines() {
-				d.draw_text(line, level_list_width + 10, y, 20, Color::WHITE);
-				y += 30;
-			}
+			self.level_desc_text.set_text(level.description());
+			self.level_desc_text
+				.update_width(d, d.get_render_width() - level_list_width - 30);
+			self.level_desc_text.draw(d, level_list_width + 10, y);
+			y += self.level_desc_text.height() + 10;
 
 			if let Some(solutions) = self.solutions.get_mut(level.id()) {
 				let solution_entry_height = 40;

src/util.rs

@@ -1,4 +1,4 @@
-use std::{collections::HashMap, fs::read_dir, path::PathBuf};
+use std::{collections::HashMap, fs::read_dir, ops::Range, path::PathBuf};
 
 use raylib::prelude::*;
 
@@ -44,6 +44,92 @@ pub fn simple_button(d: &mut RaylibDrawHandle, x: i32, y: i32, width: i32, heigh
 	pressed
 }
 
+#[derive(Debug)]
+pub struct ShapedText {
+	text: String,
+	max_width: i32,
+	font_size: i32,
+	lines: Vec<Range<usize>>,
+}
+
+impl ShapedText {
+	pub fn new(font_size: i32) -> Self {
+		Self {
+			text: String::new(),
+			font_size,
+			max_width: 500,
+			lines: Vec::new(),
+		}
+	}
+
+	pub fn set_text(&mut self, text: &str) {
+		if text != self.text {
+			self.text = text.to_owned();
+			self.lines.clear();
+		}
+	}
+
+	pub fn height(&self) -> i32 {
+		self.font_size * self.lines.len() as i32
+	}
+
+	pub fn update_width(&mut self, d: &RaylibHandle, width: i32) {
+		if self.max_width == width && !self.lines.is_empty() {
+			return;
+		}
+		self.max_width = width;
+		self.lines.clear();
+		// todo remove leading space on broken lines
+		// todo fix splitting very long words
+		let mut line_start = 0;
+		let mut line_end = 0;
+		for (i, c) in self.text.char_indices() {
+			if c == ' ' {
+				let line = &self.text[line_start..i];
+				let new_line_length = d.measure_text(line, self.font_size);
+				if new_line_length <= self.max_width {
+					line_end = i;
+				} else {
+					self.lines.push(line_start..line_end);
+					line_start = line_end;
+				}
+			}
+			if c == '\n' {
+				let line = &self.text[line_start..i];
+				let new_line_length = d.measure_text(line, self.font_size);
+				if new_line_length <= self.max_width {
+					self.lines.push(line_start..i);
+					line_end = i + 1;
+					line_start = i + 1;
+				} else {
+					self.lines.push(line_start..line_end);
+					self.lines.push(line_end..(i + 1));
+					line_start = i + 1;
+					line_end = i + 1;
+				}
+			}
+		}
+		let i = self.text.len();
+		let line = &self.text[line_start..i];
+		let new_line_length = d.measure_text(line, self.font_size);
+		if new_line_length <= self.max_width {
+			self.lines.push(line_start..i);
+		} else {
+			self.lines.push(line_start..line_end);
+			self.lines.push(line_end..i);
+		}
+	}
+
+	pub fn draw(&self, d: &mut RaylibDrawHandle, x: i32, y: i32) {
+		// d.draw_rectangle(x, y, self.max_width, 4, Color::RED);
+		for (i, line) in self.lines.iter().enumerate() {
+			let line = &self.text[line.clone()];
+			let line_y = y + self.font_size * i as i32;
+			d.draw_text(line, x, line_y, self.font_size, Color::WHITE);
+		}
+	}
+}
+
 #[derive(Debug, Default)]
 pub struct Tooltip {
 	text: Option<&'static str>,