emilk/egui · error

Vec2 index out of bounds: {index}

Error message

Vec2 index out of bounds: {index}

What it means

Error "Vec2 index out of bounds: {index}" thrown in emilk/egui.

Source

Thrown at crates/emath/src/vec2.rs:333

    #[must_use]
    #[inline]
    pub fn clamp(self, min: Self, max: Self) -> Self {
        Self {
            x: self.x.clamp(min.x, max.x),
            y: self.y.clamp(min.y, max.y),
        }
    }
}

impl core::ops::Index<usize> for Vec2 {
    type Output = f32;

    #[inline(always)]
    fn index(&self, index: usize) -> &f32 {
        match index {
            0 => &self.x,
            1 => &self.y,
            _ => panic!("Vec2 index out of bounds: {index}"),
        }
    }
}

impl core::ops::IndexMut<usize> for Vec2 {
    #[inline(always)]
    fn index_mut(&mut self, index: usize) -> &mut f32 {
        match index {
            0 => &mut self.x,
            1 => &mut self.y,
            _ => panic!("Vec2 index out of bounds: {index}"),
        }
    }
}

impl PartialEq for Vec2 {
    #[track_caller]
    #[inline]

View on GitHub (pinned to 1a9d2af9ef)

Solutions

1. Index a Vec2 only with 0 (x) or 1 (y); use v.x / v.y directly instead of indexing.

Example fix

let value = match index { 0 => v.x, 1 => v.y, _ => return };

When it happens

Trigger: Thrown at crates/emath/src/vec2.rs:333 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of emilk/egui@1a9d2af9ef (2026-08-19). Data as JSON: /api/errors/d3114ed6acae048e. Report an issue: GitHub.