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* Add drawable implementation * Add text rendering * Fix inline and impl * Fix imports * Update README.md
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,70 @@ | ||
| //! Demonstrates drawing text on the canvas | ||
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| use qilin::game::context::GameContext; | ||
| use qilin::game::game::Game; | ||
| use qilin::render::canvas::Canvas; | ||
| use qilin::render::color::Color; | ||
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| use qilin::scene::Scene; | ||
| use qilin::simplified::vec2; | ||
| use qilin::text::TextSketch; | ||
| use qilin::types::{GameConfig, FPS30}; | ||
| use qilin::ScaleMode; | ||
| use qilin::WindowOptions; | ||
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| struct TextScene; | ||
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| impl Scene for TextScene { | ||
| // create new empty scene | ||
| fn new() -> Self | ||
| where | ||
| Self: Sized, | ||
| { | ||
| Self | ||
| } | ||
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| // gets called when game enters current scene | ||
| fn enter(&mut self) { println!("What do you call a fake noodle?") } | ||
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| // gets called when window requests draw updates | ||
| fn update(&mut self, canvas: &mut Canvas, _ctx: &mut GameContext) { | ||
| canvas.drawable( | ||
| &TextSketch::new(vec2(10, 10), include_bytes!("assets/Roboto-Medium.ttf")) | ||
| .with_color(Color::RED) | ||
| .with_text("Hello World!", 30.0), | ||
| ); | ||
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| canvas.drawable( | ||
| &TextSketch::new(vec2(10, 100), include_bytes!("assets/Roboto-Medium.ttf")) | ||
| .with_color(Color::YELLOW) | ||
| .with_text("Implementing text-rendering was real pain.", 40.0), | ||
| ); | ||
| } | ||
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| fn fixed_update(&mut self, _canvas: &mut Canvas, _ctx: &mut GameContext) { | ||
| // Will be called X times per second. | ||
| // This ensures, physics are applied independent of frame-rate. | ||
| // See https://docs.unity3d.com/ScriptReference/MonoBehaviour.FixedUpdate.html for FixedUpdate() in Unity. | ||
| } | ||
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| // gets called when game exits current scene | ||
| fn exit(&mut self) { println!("An impasta!") } | ||
| } | ||
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| fn main() { | ||
| Game::new::<TextScene>() // create game object with ShapeScene as entry scene | ||
| .with_config(GameConfig { | ||
| title: "My Texts".to_string(), // set window title | ||
| update_rate_limit: FPS30, // limit update rate to 30 fps, default is 60 fps | ||
| width: 800, // set initial width | ||
| height: 600, // set initial height | ||
| fixed_time_step: Default::default(), // for better docs, see GameConfig or examples/move. | ||
| window: WindowOptions { | ||
| scale_mode: ScaleMode::AspectRatioStretch, // scale pixels to fit in aspect ratio | ||
| resize: true, // make window resizeable | ||
| ..Default::default() | ||
| }, | ||
| }) | ||
| .play() | ||
| .expect("Failed to play game"); | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,79 @@ | ||
| use crate::render::canvas::Canvas; | ||
| use crate::render::color::Color; | ||
| use crate::render::sketch::Drawable; | ||
| use fontdue::layout::{CoordinateSystem, Layout, TextStyle}; | ||
| use fontdue::Font; | ||
| use mint::Vector2; | ||
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| /// Sketch to draw text on a canvas. | ||
| pub struct TextSketch { | ||
| layout: Layout, | ||
| font: Font, | ||
| color: Color, | ||
| pos: Vector2<u32>, | ||
| } | ||
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| impl TextSketch { | ||
| /// Create a new empty [TextSketch] with font data. | ||
| /// | ||
| /// ### Example | ||
| /// ```rust | ||
| /// use mint::Vector2; | ||
| /// use qilin::text::TextSketch; | ||
| /// | ||
| /// let font = include_bytes!("myAssets/myFont.ttf"); | ||
| /// let sketch = TextSketch::new(Vector2::new(10, 10), font); | ||
| /// ``` | ||
| #[inline] | ||
| pub fn new(pos: Vector2<u32>, font: &[u8]) -> Self { | ||
| Self { | ||
| layout: Layout::new(CoordinateSystem::PositiveYDown), | ||
| color: Color::BLACK, | ||
| font: Font::from_bytes(font, Default::default()).expect("Failed to load font"), | ||
| pos, | ||
| } | ||
| } | ||
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| /// Set the color of the text. | ||
| #[inline] | ||
| pub fn with_color(mut self, color: Color) -> Self { | ||
| self.color = color; | ||
| self | ||
| } | ||
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| /// Append new text to the layout with `text` as text and `px` as size in pixels. | ||
| #[inline] | ||
| pub fn with_text(mut self, text: &str, px: f32) -> Self { | ||
| self.layout | ||
| .append(&[self.font.clone()], &TextStyle::new(text, px, 0)); | ||
| self | ||
| } | ||
| } | ||
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| impl Drawable for TextSketch { | ||
| #[inline] | ||
| fn apply(&self, canvas: &mut Canvas) { | ||
| self.layout.glyphs().iter().for_each(|glyph| { | ||
| let (metrics, buffer) = self.font.rasterize_config(glyph.key); | ||
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| let width = metrics.width; | ||
| let height = metrics.height; | ||
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| // Calculate the starting position to draw the glyph | ||
| let x0 = self.pos.x + glyph.x as u32; | ||
| let y0 = self.pos.y + glyph.y as u32; | ||
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| // Draw the glyph to the canvas using the specified color | ||
| for y in 0..height { | ||
| for x in 0..width { | ||
| let alpha = buffer[y * width + x] as u8; | ||
| if alpha > 0 { | ||
| let x_coord = x0 + x as u32; | ||
| let y_coord = y0 + y as u32; | ||
| canvas.set_pixel(x_coord as usize, y_coord as usize, &self.color); | ||
| } | ||
| } | ||
| } | ||
| }); | ||
| } | ||
| } |