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Fix check that cursor position is within window bounds #9662

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merged 2 commits into from Sep 3, 2023
Merged

Fix check that cursor position is within window bounds #9662

merged 2 commits into from Sep 3, 2023

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mdickopp
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@mdickopp mdickopp commented Aug 31, 2023

Objective

The recently introduced check that the cursor position returned by Window::cursor_position() is within the bounds of the window (3cf94e7) has the following issue:

If w is the window width, points within the window satisfy the condition 0 ≤ x < w, but the code assumes the condition 0 ≤ xw. In other words, if x = w, the point is not within the window bounds. Likewise for the height. This program demonstrates the issue:

use bevy::{prelude::*, window::WindowResolution};

fn main() {
    let mut window = Window {
        resolution: WindowResolution::new(100.0, 100.0),
        ..default()
    };

    window.set_cursor_position(Some(Vec2::new(100.0, 0.0)));

    println!("{:?}", window.cursor_position());
}

It prints Some(Vec2(100.0, 0.0)) instead of the expected None.

Solution

  • Exclude the upper bound, i.e., the window width for the x position and the window height for the y position.

@rparrett
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rparrett commented Aug 31, 2023

A fix (for the first issue you mentioned) was just merged: #9657

@mdickopp
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Should I open a new PR for the second issue (and close this one)?

@rparrett
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Feel free to modify this PR. Just making sure you know that the code just changed underneath you.

@mdickopp
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I modified the commit and the PR description accordingly.

@alice-i-cecile alice-i-cecile added C-Bug An unexpected or incorrect behavior A-Input Player input via keyboard, mouse, gamepad, and more A-Windowing Platform-agnostic interface layer to run your app in labels Aug 31, 2023
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I'd like a quick regression test (or a handful of tests) for this :)

Good fix though.

@mdickopp
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mdickopp commented Sep 1, 2023

Tests added.

@alice-i-cecile alice-i-cecile added this to the 0.12 milestone Sep 1, 2023
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@NoahShomette NoahShomette left a comment

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LGTM

@alice-i-cecile alice-i-cecile added the S-Ready-For-Final-Review This PR has been approved by the community. It's ready for a maintainer to consider merging it label Sep 3, 2023
@alice-i-cecile alice-i-cecile added this pull request to the merge queue Sep 3, 2023
Merged via the queue into bevyengine:main with commit a166b65 Sep 3, 2023
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rdrpenguin04 pushed a commit to rdrpenguin04/bevy that referenced this pull request Jan 9, 2024
# Objective

The recently introduced check that the cursor position returned by
`Window::cursor_position()` is within the bounds of the window
(bevyengine@3cf94e7)
has the following issue:

If *w* is the window width, points within the window satisfy the
condition 0 ≤ *x* < *w*, but the code assumes the condition 0 ≤ *x* ≤
*w*. In other words, if *x* = *w*, the point is not within the window
bounds. Likewise for the height. This program demonstrates the issue:

```rust
use bevy::{prelude::*, window::WindowResolution};

fn main() {
    let mut window = Window {
        resolution: WindowResolution::new(100.0, 100.0),
        ..default()
    };

    window.set_cursor_position(Some(Vec2::new(100.0, 0.0)));

    println!("{:?}", window.cursor_position());
}
```

It prints `Some(Vec2(100.0, 0.0))` instead of the expected `None`.

## Solution

- Exclude the upper bound, i.e., the window width for the *x* position
and the window height for the *y* position.
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A-Input Player input via keyboard, mouse, gamepad, and more A-Windowing Platform-agnostic interface layer to run your app in C-Bug An unexpected or incorrect behavior S-Ready-For-Final-Review This PR has been approved by the community. It's ready for a maintainer to consider merging it
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4 participants