feat(Graphics): add `fitScale` function

Open Beginner friendly

#25 opened on Aug 21, 2026 0 comments 0 reactions 0 assignees View on GitHub

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Assessment

Difficulty: 2/5
Estimated time: 1-3 hours
Newbie friendliness: 72/100

Issue type: Feature
Clarity: Mostly clear
Activity status: Active
Tech stack: fsharp
Domain: computer-graphics

Research direction

Start from the proposed fitScale definition and the commented Assert.equal example in issue #25. Locate the project entry point for the Size-related graphics code, add the function there, and run the project tests; done means the shown 4×3 image in a 3×4 viewport satisfies the asserted result.

Written by the indexing model from the issue text.

Description

good first issue

/// Вычисляет коэффициент масштаба, необходимый, чтобы вписать изображение в указанную область
let fitScale (viewportSize: Size) (imageSize: Size) =
    let dw = imageSize.Width - viewportSize.Width
    let dh = imageSize.Height - viewportSize.Height

    if dw > dh then
        if dw > 0 then
            float viewportSize.Width / float imageSize.Width
        else
            1.0
    else
        if dh > 0 then
            float viewportSize.Height / float imageSize.Height
        else
            1.0

// Assert.equal
//     (
//         let imageSize = Size.create 4 3
//         let scale = fitScale (Size.create 3 4) imageSize
//         imageSize * scale
//     )
//     (Size.create 3 2)
//     ""

Dominant language: F#
Stars: 0
Forks: 0
PR merge metrics: No merged PRs in 30d

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