From d11b02d45e6e1a614dd4e341ae424751bea3906f Mon Sep 17 00:00:00 2001
From: Emil Ernerfeldt <emilernerfeldt@gmail.com>
Date: Sat, 16 Jan 2021 20:57:31 +0100
Subject: [PATCH] [emath] Add Pos2::zero() and Rect::clamp(point)

---
 emath/src/pos2.rs | 7 +++++++
 emath/src/rect.rs | 8 ++++++++
 2 files changed, 15 insertions(+)

diff --git a/emath/src/pos2.rs b/emath/src/pos2.rs
index b0d18283..d00c6cb5 100644
--- a/emath/src/pos2.rs
+++ b/emath/src/pos2.rs
@@ -35,6 +35,13 @@ impl From<&[f32; 2]> for Pos2 {
 }
 
 impl Pos2 {
+    /// The zero position, the origin.
+    /// The top left corner in a GUI.
+    /// Same as `Pos2::default()`.
+    pub const fn zero() -> Self {
+        Self { x: 0.0, y: 0.0 }
+    }
+
     pub const fn new(x: f32, y: f32) -> Self {
         Self { x, y }
     }
diff --git a/emath/src/rect.rs b/emath/src/rect.rs
index 8817822a..12606874 100644
--- a/emath/src/rect.rs
+++ b/emath/src/rect.rs
@@ -131,6 +131,14 @@ impl Rect {
             && p.y <= self.min.y + self.size().y
     }
 
+    /// Return the given points clamped to be inside the rectangle
+    #[must_use]
+    pub fn clamp(&self, mut p: Pos2) -> Pos2 {
+        p.x = clamp(p.x, self.x_range());
+        p.y = clamp(p.y, self.y_range());
+        p
+    }
+
     pub fn extend_with(&mut self, p: Pos2) {
         self.min = self.min.min(p);
         self.max = self.max.max(p);