diff --git a/emigui/src/math.rs b/emigui/src/math.rs
index 0066deb7..08660925 100644
--- a/emigui/src/math.rs
+++ b/emigui/src/math.rs
@@ -122,19 +122,26 @@ pub fn vec2(x: f32, y: f32) -> Vec2 {
 
 #[derive(Clone, Copy, Debug, Default, Deserialize, Serialize)]
 pub struct Rect {
-    pub pos: Vec2,
-    pub size: Vec2,
+    min: Vec2,
+    max: Vec2,
 }
 
 impl Rect {
+    pub fn from_min_max(min: Vec2, max: Vec2) -> Self {
+        Rect { min, max: max }
+    }
+
     pub fn from_min_size(min: Vec2, size: Vec2) -> Self {
-        Rect { pos: min, size }
+        Rect {
+            min,
+            max: min + size,
+        }
     }
 
     pub fn from_center_size(center: Vec2, size: Vec2) -> Self {
         Rect {
-            pos: center - size * 0.5,
-            size,
+            min: center - size * 0.5,
+            max: center + size * 0.5,
         }
     }
 
@@ -144,38 +151,36 @@ impl Rect {
     }
 
     pub fn contains(&self, p: Vec2) -> bool {
-        self.pos.x <= p.x
-            && p.x <= self.pos.x + self.size.x
-            && self.pos.y <= p.y
-            && p.y <= self.pos.y + self.size.y
+        self.min.x <= p.x
+            && p.x <= self.min.x + self.size().x
+            && self.min.y <= p.y
+            && p.y <= self.min.y + self.size().y
     }
 
     pub fn center(&self) -> Vec2 {
         Vec2 {
-            x: self.pos.x + self.size.x / 2.0,
-            y: self.pos.y + self.size.y / 2.0,
+            x: self.min.x + self.size().x / 2.0,
+            y: self.min.y + self.size().y / 2.0,
         }
     }
-
     pub fn min(&self) -> Vec2 {
-        self.pos
+        self.min
     }
-
     pub fn max(&self) -> Vec2 {
-        self.pos + self.size
+        self.max
     }
-
     pub fn size(&self) -> Vec2 {
-        self.size
+        self.max - self.min
     }
     pub fn width(&self) -> f32 {
-        self.size.x
+        self.max.x - self.min.x
     }
     pub fn height(&self) -> f32 {
-        self.size.y
+        self.max.y - self.min.y
     }
 
-    // Convenience functions:
+    // Convenience functions (assumes origin is towards left top):
+
     pub fn left_top(&self) -> Vec2 {
         vec2(self.min().x, self.min().y)
     }
diff --git a/emigui/src/mesher.rs b/emigui/src/mesher.rs
index 396ec526..5bd508c1 100644
--- a/emigui/src/mesher.rs
+++ b/emigui/src/mesher.rs
@@ -347,7 +347,9 @@ impl Mesher {
                     let min = rect.min();
                     let max = rect.max();
 
-                    let cr = corner_radius.min(rect.size.x * 0.5).min(rect.size.y * 0.5);
+                    let cr = corner_radius
+                        .min(rect.width() * 0.5)
+                        .min(rect.height() * 0.5);
 
                     if cr <= 0.0 {
                         path_points.push(vec2(min.x, min.y));
diff --git a/emigui/src/widgets.rs b/emigui/src/widgets.rs
index 124468e4..f77cd300 100644
--- a/emigui/src/widgets.rs
+++ b/emigui/src/widgets.rs
@@ -227,7 +227,7 @@ impl Widget for RadioButton {
             center: big_icon_rect.center(),
             fill_color: Some(fill_color),
             outline: None,
-            radius: big_icon_rect.size.x / 2.0,
+            radius: big_icon_rect.size().x / 2.0,
         });
 
         if self.checked {
@@ -235,7 +235,7 @@ impl Widget for RadioButton {
                 center: small_icon_rect.center(),
                 fill_color: Some(stroke_color),
                 outline: None,
-                radius: small_icon_rect.size.x / 2.0,
+                radius: small_icon_rect.size().x / 2.0,
             });
         }
 
@@ -409,7 +409,7 @@ impl<'a> Widget for Slider<'a> {
 
                 let rect = interact.rect;
                 let thickness = rect.size().y;
-                let thin_size = vec2(rect.size.x, thickness / 5.0);
+                let thin_size = vec2(rect.size().x, thickness / 5.0);
                 let thin_rect = Rect::from_center_size(rect.center(), thin_size);
                 let marker_center_x = remap_clamp(value, min, max, rect.min().x, rect.max().x);