Allow Plot::link_cursor to accept impl Into<Vec2b> (#66)

Updates the `link` argument to the `impl Into<Vec2b>` to be consistent
with `link_axis`. This makes it slightly cleaner to use.

<!--
Please read the "Making a PR" section of
[`CONTRIBUTING.md`](https://github.com/emilk/egui_plot/blob/master/CONTRIBUTING.md)
before opening a Pull Request!

* Keep your PR:s small and focused.
* The PR title is what ends up in the changelog, so make it descriptive!
* If applicable, add a screenshot or gif.
* If it is a non-trivial addition, consider adding a demo f or a new
example.
* Do NOT open PR:s from your `master` or `main` branch, as that makes it
hard for maintainers to test and add commits to your PR.
* Remember to run `cargo fmt` and `cargo clippy`.
* Open the PR as a draft until you have self-reviewed it and run
`./scripts/check.sh`.
* When you have addressed a PR comment, mark it as resolved.

Please be patient! We will review your PR, but our time is limited!
-->

* [x] I have followed the instructions in the PR template

Author: jetuk

egui_plot/src/lib.rs

@@ -520,8 +520,8 @@ impl<'a> Plot<'a> {
     ///
     /// This is enabled by default.
     #[inline]
-    pub fn auto_bounds(mut self, auto_bounds: Vec2b) -> Self {
-        self.default_auto_bounds = auto_bounds;
+    pub fn auto_bounds(mut self, auto_bounds: impl Into<Vec2b>) -> Self {
+        self.default_auto_bounds = auto_bounds.into();
         self
     }
 
@@ -587,8 +587,8 @@ impl<'a> Plot<'a> {
     /// Add this plot to a cursor link group so that this plot will share the cursor position with other plots
     /// in the same group. A plot cannot belong to more than one cursor group.
     #[inline]
-    pub fn link_cursor(mut self, group_id: impl Into<Id>, link: Vec2b) -> Self {
-        self.linked_cursors = Some((group_id.into(), link));
+    pub fn link_cursor(mut self, group_id: impl Into<Id>, link: impl Into<Vec2b>) -> Self {
+        self.linked_cursors = Some((group_id.into(), link.into()));
         self
     }
 
@@ -1262,7 +1262,7 @@ impl<'a> Plot<'a> {
 /// Returns the rect left after adding axes.
 fn axis_widgets<'a>(
     mem: Option<&PlotMemory>,
-    show_axes: Vec2b,
+    show_axes: impl Into<Vec2b>,
     complete_rect: Rect,
     [x_axes, y_axes]: [&'a [AxisHints<'a>]; 2],
 ) -> ([Vec<AxisWidget<'a>>; 2], Rect) {
@@ -1288,6 +1288,7 @@ fn axis_widgets<'a>(
     //      |      X-axis 1      |   |
     //  +   +--------------------+---+
     //
+    let show_axes = show_axes.into();
 
     let mut x_axis_widgets = Vec::<AxisWidget<'_>>::new();
     let mut y_axis_widgets = Vec::<AxisWidget<'_>>::new();

egui_plot/src/plot_ui.rs

@@ -56,9 +56,9 @@ impl PlotUi {
     }
 
     /// Set the auto-bounds mode for the plot axes.
-    pub fn set_auto_bounds(&mut self, auto_bounds: Vec2b) {
+    pub fn set_auto_bounds(&mut self, auto_bounds: impl Into<Vec2b>) {
         self.bounds_modifications
-            .push(BoundsModification::AutoBounds(auto_bounds));
+            .push(BoundsModification::AutoBounds(auto_bounds.into()));
     }
 
     /// Can be used to check if the plot was hovered or clicked.

egui_plot/src/transform.rs

@@ -279,11 +279,12 @@ pub struct PlotTransform {
 }
 
 impl PlotTransform {
-    pub fn new(frame: Rect, bounds: PlotBounds, center_axis: Vec2b) -> Self {
+    pub fn new(frame: Rect, bounds: PlotBounds, center_axis: impl Into<Vec2b>) -> Self {
         debug_assert!(
             0.0 <= frame.width() && 0.0 <= frame.height(),
             "Bad plot frame: {frame:?}"
         );
+        let center_axis = center_axis.into();
 
         // Since the current Y bounds an affect the final X bounds and vice versa, we need to keep
         // the original version of the `bounds` before we start modifying it.