add basic statusline widget; text drawing support

3 files changed, 101 insertions, 11 deletions

diff --git a/src/app.rs b/src/app.rs
index 13f8732..695d097 100644
--- a/src/app.rs
+++ b/src/app.rs
@@ -11,18 +11,27 @@ use sdl2::{
     mouse::MouseButton,
     pixels::Color,
     rect::{Point, Rect},
-    render::Canvas,
+    render::{Canvas, Texture},
+    ttf::Sdl2TtfContext,
     video::Window,
     Sdl,
 };
 
-use crate::consts::{BLACK, GRID_COLOR, WHITE};
+macro_rules! quick_rect(
+    ($x:expr, $y:expr, $w:expr, $h:expr) => (
+        Rect::new($x as i32, $y as i32, $w as u32, $h as u32)
+    )
+);
+
+use crate::consts::{BLACK, FONT_PATH, GRID_COLOR, WHITE};
 
 pub struct AppState<'ctx> {
     active_color: bool,
     brush_size: u8,
     canvas: Canvas<Window>,
     context: &'ctx Sdl,
+    ttf_context: &'ctx Sdl2TtfContext,
+    mouse: (i32, i32),
     current_operation: Operation,
     grid: Grid,
     last_point: Option<Point>,
@@ -261,13 +270,58 @@ impl<'ctx> AppState<'ctx> {
         }
     }
 
+    fn draw_statusline(&mut self) {
+        let (winsize_x, winsize_y) = self.canvas.window().size();
+        let status_height: u32 = 20;
+        let status_width = winsize_x;
+        self.canvas.set_draw_color(WHITE);
+        self.canvas
+            .fill_rect(quick_rect!(
+                0,
+                winsize_y - status_height,
+                status_width,
+                status_height
+            ))
+            .unwrap();
+        let symmetry_symbol = match self.symmetry {
+            Symmetry { x: None, y: None } => "",
+            Symmetry {
+                x: Some(_),
+                y: None,
+            } => "-",
+            Symmetry {
+                x: None,
+                y: Some(_),
+            } => "|",
+            Symmetry {
+                x: Some(_),
+                y: Some(_),
+            } => "+",
+        };
+        let mouse_coords = if let Some((x, y)) = self.idx_at_coord(self.mouse) {
+            format!("{:3}, {:3}", x, y)
+        } else {
+            format!("--, --")
+        };
+        let status_text = format!(
+            "[BRUSH {}] [SYM {:1}]   {}",
+            self.brush_size + 1,
+            symmetry_symbol,
+            mouse_coords
+        );
+        draw_text(
+            &mut self.canvas,
+            self.ttf_context,
+            status_text,
+            BLACK,
+            (0, winsize_y - status_height),
+        );
+    }
+
     fn draw(&mut self) {
         let cs = self.zoom as u32;
         let (width, height) = (self.width(), self.height());
         let start = self.start;
-        if self.grid.enabled {
-            self.draw_grid();
-        }
         let canvas = &mut self.canvas;
         for (idx, val) in self.pixmap.data.iter().enumerate() {
             if *val {
@@ -277,15 +331,19 @@ impl<'ctx> AppState<'ctx> {
                 canvas
                     .fill_rect(Rect::new(
                         // start drawing 1 pixel after the grid line
-                        x * cs as i32 + start.x() + 1,
-                        y * cs as i32 + start.y() + 1,
+                        x * cs as i32 + start.x(),
+                        y * cs as i32 + start.y(),
                         // stop drawing 1 pixel before the grid line
-                        cs - 1,
-                        cs - 1,
+                        cs,
+                        cs,
                     ))
                     .unwrap();
             }
         }
+        if self.grid.enabled {
+            self.draw_grid();
+        }
+        self.draw_statusline();
     }
 
     fn redraw(&mut self) {
@@ -298,12 +356,18 @@ impl<'ctx> AppState<'ctx> {
 
 // publicly available functions on appstate
 impl<'ctx> AppState<'ctx> {
-    pub fn init(width: u32, height: u32, context: &'ctx Sdl) -> Self {
+    pub fn init(
+        width: u32,
+        height: u32,
+        context: &'ctx Sdl,
+        ttf_context: &'ctx Sdl2TtfContext,
+    ) -> Self {
         let video_subsystem = context.video().unwrap();
 
         let window = video_subsystem
             .window("Pixel editor", 200, 200)
             .position_centered()
+            .resizable()
             .opengl()
             .build()
             .map_err(|e| e.to_string())
@@ -321,6 +385,8 @@ impl<'ctx> AppState<'ctx> {
             brush_size: 0,
             canvas,
             context,
+            ttf_context,
+            mouse: (0, 0),
             current_operation: Vec::new(),
             grid: Grid::new(),
             last_point: None,
@@ -341,6 +407,7 @@ impl<'ctx> AppState<'ctx> {
         let mut event_pump = self.context.event_pump().unwrap();
         'running: loop {
             let mouse = event_pump.mouse_state();
+            self.mouse = (mouse.x(), mouse.y());
             for event in event_pump.poll_iter() {
                 match event {
                     Event::KeyDown {
@@ -449,3 +516,24 @@ impl<'ctx> AppState<'ctx> {
         }
     }
 }
+
+fn draw_text<S: AsRef<str>>(
+    canvas: &mut Canvas<Window>,
+    ttf_context: &Sdl2TtfContext,
+    text: S,
+    color: Color,
+    (x, y): (u32, u32),
+) {
+    let text = text.as_ref();
+    let texture_creator = canvas.texture_creator();
+    let mut font = ttf_context.load_font(FONT_PATH, 17).unwrap();
+    font.set_style(sdl2::ttf::FontStyle::NORMAL);
+    font.set_hinting(sdl2::ttf::Hinting::Mono);
+    let surface = font.render(text.as_ref()).blended(color).unwrap();
+    let texture = texture_creator
+        .create_texture_from_surface(&surface)
+        .unwrap();
+    let (width, height) = font.size_of_latin1(text.as_bytes()).unwrap();
+    let area = quick_rect!(x, y, width, height);
+    canvas.copy(&texture, None, area);
+}
diff --git a/src/consts.rs b/src/consts.rs
index b5cea43..8c90693 100644
--- a/src/consts.rs
+++ b/src/consts.rs
@@ -4,3 +4,4 @@ pub const GRID_COLOR: Color = Color::RGB(64, 64, 64);
 pub const WHITE: Color = Color::RGB(255, 255, 255);
 pub const BLACK: Color = Color::RGB(0, 0, 0);
 
+pub const FONT_PATH: &'static str = "./assets/NerdInput-Regular.ttf";
diff --git a/src/main.rs b/src/main.rs
index cb39648..bd0590e 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -7,5 +7,6 @@ use app::AppState;
 
 pub fn main() {
     let sdl_context = sdl2::init().unwrap();
-    AppState::init(100, 100, &sdl_context).run();
+    let ttf_context = sdl2::ttf::init().unwrap();
+    AppState::init(100, 100, &sdl_context, &ttf_context).run();
 }