From c50333805bcc17762ccba32f0cca28c07c1bd2b8 Mon Sep 17 00:00:00 2001
From: griffi-gh <prasol258@gmail.com>
Date: Mon, 19 Feb 2024 04:37:28 +0100
Subject: [PATCH] wip

---
 hui-examples/examples/rounded.rs | 55 ++++++++++++++++++++++++++++++++
 hui/src/draw.rs                  | 34 ++++++++++++++++++++
 2 files changed, 89 insertions(+)
 create mode 100644 hui-examples/examples/rounded.rs

diff --git a/hui-examples/examples/rounded.rs b/hui-examples/examples/rounded.rs
new file mode 100644
index 0000000..449c2d8
--- /dev/null
+++ b/hui-examples/examples/rounded.rs
@@ -0,0 +1,55 @@
+use glam::{vec4, UVec2};
+use glium::{backend::glutin::SimpleWindowBuilder, Surface};
+use winit::{
+  event::{Event, WindowEvent},
+  event_loop::{EventLoopBuilder, ControlFlow}
+};
+use hui::{
+  UiInstance, UiSize,
+  element::container::{Alignment, Container, Sides}
+};
+use hui_glium::GliumUiRenderer;
+
+fn main() {
+  kubi_logging::init();
+
+  let event_loop = EventLoopBuilder::new().build().unwrap();
+  let (_window, display) = SimpleWindowBuilder::new().build(&event_loop);
+
+  let mut hui = UiInstance::new();
+  let mut backend = GliumUiRenderer::new(&display);
+  event_loop.run(|event, window_target| {
+    window_target.set_control_flow(ControlFlow::Poll);
+    match event {
+      Event::WindowEvent { event: WindowEvent::CloseRequested, .. } => {
+        window_target.exit();
+      },
+      Event::AboutToWait => {
+        let mut frame = display.draw();
+        frame.clear_color_srgb(0.5, 0.5, 0.5, 0.);
+
+        let resolution = UVec2::from(display.get_framebuffer_dimensions()).as_vec2();
+
+        hui.begin();
+
+        hui.add(Container {
+          gap: 5.,
+          padding: Sides::all(5.),
+          align: (Alignment::Center, Alignment::Center),
+          size: (UiSize::Fraction(1.), UiSize::Fraction(1.)),
+          background: Some(vec4(0.1, 0.1, 0.1, 1.)),
+          corner_radius: Some(10.),
+          ..Default::default()
+        }, resolution);
+
+        hui.end();
+
+        backend.update(&hui);
+        backend.draw(&mut frame, resolution);
+
+        frame.finish().unwrap();
+      }
+      _ => (),
+    }
+  }).unwrap();
+}
diff --git a/hui/src/draw.rs b/hui/src/draw.rs
index 67a12f4..10f472c 100644
--- a/hui/src/draw.rs
+++ b/hui/src/draw.rs
@@ -136,9 +136,43 @@ impl UiDrawPlan {
           let corner_radius = corner_radius.unwrap_or(0.0);
           let vidx = swapper.current().vertices.len() as u32;
           if corner_radius > 0.0 {
+            let mut vidx_ctr = vidx;
             todo!("rounded corners are not implemented");
             //TODO vtx-based rounded corners
             //swapper.current_mut().indices.extend();
+
+            //TODO: make this configurable or compute dynamically
+            let rounded_corner_verts = 4;
+            for i in 0..rounded_corner_verts {
+              let cratio = i as f32 / rounded_corner_verts as f32;
+              let angle = cratio * std::f32::consts::PI * 0.5;
+              let x = angle.sin();
+              let y = angle.cos();
+              //Top-right corner
+              swapper.current_mut().vertices.push(UiVertex {
+                position: *position + vec2(x, 1. - y) * corner_radius + *size - vec2(corner_radius, 0.),
+                color: *color,
+                uv: vec2(0.0, 0.0),
+              });
+              //Top-left corner
+              swapper.current_mut().vertices.push(UiVertex {
+                position: *position + vec2(x, y),
+                color: *color,
+                uv: vec2(0.0, 0.0),
+              });
+              //Bottom-left corner
+              swapper.current_mut().vertices.push(UiVertex {
+                position: *position + vec2(x, y),
+                color: *color,
+                uv: vec2(0.0, 0.0),
+              });
+              //Bottom-right corner
+              swapper.current_mut().vertices.push(UiVertex {
+                position: *position + vec2(x, y),
+                color: *color,
+                uv: vec2(0.0, 0.0),
+              });
+            }
           } else {
             swapper.current_mut().indices.extend([vidx, vidx + 1, vidx + 2, vidx, vidx + 2, vidx + 3]);
             swapper.current_mut().vertices.extend([