Move Canvas and QRCode to iced crate

Rename `canvas` modules to `geometry` in graphics subcrates

graphics/src/geometry/stroke.rs

@@ -0,0 +1,106 @@
+//! Create lines from a [crate::widget::canvas::Path] and assigns them various attributes/styles.
+pub use crate::geometry::Style;
+
+use crate::Color;
+
+/// The style of a stroke.
+#[derive(Debug, Clone)]
+pub struct Stroke<'a> {
+    /// The color or gradient of the stroke.
+    ///
+    /// By default, it is set to a [`Style::Solid`] with [`Color::BLACK`].
+    pub style: Style,
+    /// The distance between the two edges of the stroke.
+    pub width: f32,
+    /// The shape to be used at the end of open subpaths when they are stroked.
+    pub line_cap: LineCap,
+    /// The shape to be used at the corners of paths or basic shapes when they
+    /// are stroked.
+    pub line_join: LineJoin,
+    /// The dash pattern used when stroking the line.
+    pub line_dash: LineDash<'a>,
+}
+
+impl<'a> Stroke<'a> {
+    /// Sets the color of the [`Stroke`].
+    pub fn with_color(self, color: Color) -> Self {
+        Stroke {
+            style: Style::Solid(color),
+            ..self
+        }
+    }
+
+    /// Sets the width of the [`Stroke`].
+    pub fn with_width(self, width: f32) -> Self {
+        Stroke { width, ..self }
+    }
+
+    /// Sets the [`LineCap`] of the [`Stroke`].
+    pub fn with_line_cap(self, line_cap: LineCap) -> Self {
+        Stroke { line_cap, ..self }
+    }
+
+    /// Sets the [`LineJoin`] of the [`Stroke`].
+    pub fn with_line_join(self, line_join: LineJoin) -> Self {
+        Stroke { line_join, ..self }
+    }
+}
+
+impl<'a> Default for Stroke<'a> {
+    fn default() -> Self {
+        Stroke {
+            style: Style::Solid(Color::BLACK),
+            width: 1.0,
+            line_cap: LineCap::default(),
+            line_join: LineJoin::default(),
+            line_dash: LineDash::default(),
+        }
+    }
+}
+
+/// The shape used at the end of open subpaths when they are stroked.
+#[derive(Debug, Clone, Copy)]
+pub enum LineCap {
+    /// The stroke for each sub-path does not extend beyond its two endpoints.
+    Butt,
+    /// At the end of each sub-path, the shape representing the stroke will be
+    /// extended by a square.
+    Square,
+    /// At the end of each sub-path, the shape representing the stroke will be
+    /// extended by a semicircle.
+    Round,
+}
+
+impl Default for LineCap {
+    fn default() -> LineCap {
+        LineCap::Butt
+    }
+}
+
+/// The shape used at the corners of paths or basic shapes when they are
+/// stroked.
+#[derive(Debug, Clone, Copy)]
+pub enum LineJoin {
+    /// A sharp corner.
+    Miter,
+    /// A round corner.
+    Round,
+    /// A bevelled corner.
+    Bevel,
+}
+
+impl Default for LineJoin {
+    fn default() -> LineJoin {
+        LineJoin::Miter
+    }
+}
+
+/// The dash pattern used when stroking the line.
+#[derive(Debug, Clone, Copy, Default)]
+pub struct LineDash<'a> {
+    /// The alternating lengths of lines and gaps which describe the pattern.
+    pub segments: &'a [f32],
+
+    /// The offset of [`LineDash::segments`] to start the pattern.
+    pub offset: usize,
+}