Draft Canvas types and clock example

wgpu/src/widget/canvas/frame.rs

@@ -0,0 +1,39 @@
+use iced_native::Point;
+
+use crate::{
+    canvas::{Fill, Path, Stroke},
+    triangle,
+};
+
+#[derive(Debug)]
+pub struct Frame {
+    width: u32,
+    height: u32,
+    buffers: lyon::tessellation::VertexBuffers<triangle::Vertex2D, u16>,
+}
+
+impl Frame {
+    pub(crate) fn new(width: u32, height: u32) -> Frame {
+        Frame {
+            width,
+            height,
+            buffers: lyon::tessellation::VertexBuffers::new(),
+        }
+    }
+
+    pub fn width(&self) -> u32 {
+        self.width
+    }
+
+    pub fn height(&self) -> u32 {
+        self.height
+    }
+
+    pub fn center(&self) -> Point {
+        Point::new(self.width as f32 / 2.0, self.height as f32 / 2.0)
+    }
+
+    pub fn fill(&mut self, path: Path, fill: Fill) {}
+
+    pub fn stroke(&mut self, path: Path, stroke: Stroke) {}
+}