Add a slash meter

cyberpunk-splash/src/main.rs

@@ -1,5 +1,6 @@
 use cairo::{
     Context, FontSlant, FontWeight, Format, ImageSurface, LineCap, LinearGradient, Pattern,
+    TextExtents,
 };
 use glib::Object;
 use gtk::{prelude::*, subclass::prelude::*};
@@ -16,6 +17,7 @@ pub struct SplashPrivate {
     text: Rc<RefCell<String>>,
     time: Rc<RefCell<Duration>>,
     background: Rc<RefCell<Pattern>>,
+    time_extents: Rc<RefCell<Option<TextExtents>>>,
 }
 
 impl SplashPrivate {
@@ -137,6 +139,7 @@ impl ObjectSubclass for SplashPrivate {
             text: Rc::new(RefCell::new(String::from(""))),
             time: Rc::new(RefCell::new(Duration::ZERO)),
             background: Rc::new(RefCell::new(background)),
+            time_extents: Rc::new(RefCell::new(None)),
         }
     }
 }
@@ -165,10 +168,14 @@ impl Splash {
                 let _ = context.set_source(&*background);
                 let _ = context.paint();
 
-                {
+                let time = s.imp().time.borrow().clone();
+                let minutes = time.as_secs() / 60;
+                let seconds = time.as_secs() % 60;
+
                 let center_x = width as f64 / 2.;
                 let center_y = height as f64 / 2.;
 
+                {
                     context.select_font_face(
                         "Alegreya Sans SC",
                         FontSlant::Normal,
@@ -176,12 +183,15 @@ impl Splash {
                     );
                     context.set_font_size(128.);
 
-                    let time = s.imp().time.borrow().clone();
-                    let minutes = time.as_secs() / 60;
-                    let seconds = time.as_secs() % 60;
                     let time = format!("{:02}' {:02}\"", minutes, seconds);
 
                     let time_extents = context.text_extents(&time).unwrap();
+
+                    let mut saved_extents = s.imp().time_extents.borrow_mut();
+                    if saved_extents.is_none() {
+                        *saved_extents = Some(time_extents.clone());
+                    }
+
                     let time_baseline_x = center_x - time_extents.width() / 2.;
                     let time_baseline_y = center_y + 100.;
 
@@ -196,6 +206,23 @@ impl Splash {
                     context.move_to(time_baseline_x, time_baseline_y);
                     let _ = context.set_source(gradient);
                     let _ = context.show_text(&time);
+                };
+
+                match *s.imp().time_extents.borrow() {
+                    Some(extents) => {
+                        context.set_source_rgb(0.7, 0.0, 1.0);
+                        let time_meter = SlashMeter {
+                            orientation: gtk::Orientation::Horizontal,
+                            start_x: center_x + extents.width() / 2. + 50.,
+                            start_y: center_y + 100.,
+                            count: 5,
+                            fill_count: minutes as u8,
+                            height: 60.,
+                            length: 100.,
+                        };
+                        time_meter.draw(&context);
+                    }
+                    None => {}
                 }
             }
         });
@@ -308,6 +335,46 @@ impl AsymLine {
     }
 }
 
+struct SlashMeter {
+    orientation: gtk::Orientation,
+    start_x: f64,
+    start_y: f64,
+    count: u8,
+    fill_count: u8,
+    height: f64,
+    length: f64,
+}
+
+impl SlashMeter {
+    fn draw(&self, context: &Context) {
+        match self.orientation {
+            gtk::Orientation::Horizontal => {
+                let angle: f64 = 0.8;
+                let run = self.height / angle.tan();
+                let width = self.length as f64 / (self.count as f64 * 2.);
+
+                for c in 0..self.count {
+                    context.set_line_width(1.);
+
+                    let start_x = self.start_x + c as f64 * width * 2.;
+                    context.move_to(start_x, self.start_y);
+                    context.line_to(start_x + run, self.start_y - self.height);
+                    context.line_to(start_x + run + width, self.start_y - self.height);
+                    context.line_to(start_x + width, self.start_y);
+                    context.line_to(start_x, self.start_y);
+                    if c < self.fill_count {
+                        let _ = context.fill();
+                    } else {
+                        let _ = context.stroke();
+                    }
+                }
+            }
+            gtk::Orientation::Vertical => {}
+            _ => panic!("unknown orientation"),
+        }
+    }
+}
+
 fn main() {
     let app = gtk::Application::builder()
         .application_id("com.luminescent-dreams.cyberpunk-splash")