TheAlgorithms/C-Sharp · error

should be greater than zero

Error message

{nameof(bitmapWidth)} should be greater than zero

What it means

Mandelbrot.GetBitmap renders the fractal into an SKBitmap sized bitmapWidth x bitmapHeight. The library first validates bitmapWidth is strictly positive and throws ArgumentOutOfRangeException otherwise, because a non-positive width makes bitmap creation and per-pixel math meaningless.

Solutions

1. Pass a bitmapWidth > 0 (e.g. 800)
2. Validate width before the call and fall back to a sensible default
3. Sanitize any parsed input so 0/negative values cannot reach the call

Example fix

// before
var bmp = Mandelbrot.GetBitmap(width, height);
// after
var bmp = Mandelbrot.GetBitmap(width > 0 ? width : 800, height);

if (bitmapWidth <= 0) throw new ArgumentException("bitmapWidth must be positive", nameof(bitmapWidth));

static bool IsValidDimension(int d) => d > 0;

try { var bmp = Mandelbrot.GetBitmap(width, height); }
catch (ArgumentOutOfRangeException ex) when (ex.ParamName == "bitmapWidth")
{
    // retry with default width
}

When it happens

Trigger: Calling Algorithms.Other.Mandelbrot.GetBitmap with bitmapWidth <= 0, e.g. GetBitmap(0, 600) or a computed width of 0 or negative from caller code.

Common situations: Width derived from a resized window or container that reported 0; config or query-string values parsed incorrectly; callers omitting the value and relying on a 0 default.

Related errors

• should be greater than zero
• should be greater than zero
• should be greater than zero
• Invalid block size
• Not enough space in input array for padding

AI-assisted analysis of TheAlgorithms/C-Sharp@96e2905cab (2026-09-13). Data as JSON: /api/errors/901de110e83e4c00. Report an issue: GitHub.

Appendix: source

Thrown at Algorithms/Other/Mandelbrot.cs:54

    /// <param name="bitmapHeight">The height of the rendered bitmap.</param>
    /// <param name="figureCenterX">The x-coordinate of the center of the figure.</param>
    /// <param name="figureCenterY">The y-coordinate of the center of the figure.</param>
    /// <param name="figureWidth">The width of the figure.</param>
    /// <param name="maxStep">Maximum number of steps to check for divergent behavior.</param>
    /// <param name="useDistanceColorCoding">Render in color or black and white.</param>
    /// <returns>The bitmap of the rendered Mandelbrot set.</returns>
    public static SKBitmap GetBitmap(
        int bitmapWidth = 800,
        int bitmapHeight = 600,
        double figureCenterX = -0.6,
        double figureCenterY = 0,
        double figureWidth = 3.2,
        int maxStep = 50,
        bool useDistanceColorCoding = true)
    {
        if (bitmapWidth <= 0)
        {
            throw new ArgumentOutOfRangeException(
                nameof(bitmapWidth),
                $"{nameof(bitmapWidth)} should be greater than zero");
        }

        if (bitmapHeight <= 0)
        {
            throw new ArgumentOutOfRangeException(
                nameof(bitmapHeight),
                $"{nameof(bitmapHeight)} should be greater than zero");
        }

        if (maxStep <= 0)
        {
            throw new ArgumentOutOfRangeException(
                nameof(maxStep),
                $"{nameof(maxStep)} should be greater than zero");
        }

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