Add time as input to emigui to enable animations

docs/index.html

@@ -81,6 +81,7 @@
                 mouse_pos: g_mouse_pos,
                 screen_size: { x: window.innerWidth, y: window.innerHeight },
                 pixels_per_point: pixels_per_point(),
+                time: window.performance.now() / 1000.0,
             };
         }
 

emigui/src/style.rs

@@ -26,6 +26,10 @@ pub struct Style {
     /// For stuff like check marks in check boxes.
     pub line_width: f32,
 
+    // TODO: add ability to disable animations!
+    /// How many seconds a typical animation should last
+    pub animation_time: f32,
+
     pub window: Window,
 }
 
@@ -44,6 +48,7 @@ impl Default for Style {
             clickable_diameter: 34.0,
             start_icon_width: 20.0,
             line_width: 1.0,
+            animation_time: 1.0 / 20.0,
             window: Window::default(),
         }
     }

emigui/src/types.rs

@@ -21,6 +21,9 @@ pub struct RawInput {
 
     /// Also known as device pixel ratio, > 1 for HDPI screens.
     pub pixels_per_point: f32,
+
+    /// Time in seconds. Relative to whatever. Used for animation.
+    pub time: f64,
 }
 
 /// What the gui maintains
@@ -46,6 +49,9 @@ pub struct GuiInput {
 
     /// Also known as device pixel ratio, > 1 for HDPI screens.
     pub pixels_per_point: f32,
+
+    /// Time in seconds. Relative to whatever. Used for animation.
+    pub time: f64,
 }
 
 impl GuiInput {
@@ -62,6 +68,7 @@ impl GuiInput {
             mouse_move,
             screen_size: new.screen_size,
             pixels_per_point: new.pixels_per_point,
+            time: new.time,
         }
     }
 }

example_glium/src/main.rs

@@ -36,6 +36,9 @@ fn main() {
 
     let mut quit = false;
 
+    // used to keep track of time for animations
+    let start_time = Instant::now();
+
     let mut frame_start = Instant::now();
 
     let mut example_app = ExampleApp::default();
@@ -50,6 +53,8 @@ fn main() {
             frame_start = Instant::now();
         }
 
+        raw_input.time = start_time.elapsed().as_nanos() as f64 * 1e-9;
+
         events_loop.poll_events(|event| {
             match event {
                 glutin::Event::WindowEvent { event, .. } => match event {