我想确定源解析是否属于指定的宽高比,在C#或VB.NET中。
目前我写了这个:
/// --------------------------------------------------------------------------
/// <summary>
/// Determine whether the source resolution belongs to the specified aspect ratio.
/// </summary>
/// --------------------------------------------------------------------------
/// <param name="resolution">
/// The source resolution.
/// </param>
///
/// <param name="aspectRatio">
/// The aspect ratio.
/// </param>
/// --------------------------------------------------------------------------
/// <returns>
/// <see langword="true"/> if the source resolution belongs to the specified aspect ratio;
/// otherwise, <see langword="false"/>.
/// </returns>
/// ----------------------------------------------------------------------------------------------------
public static bool ResolutionIsOfAspectRatio(Size resolution, Point aspectRatio) {
return (resolution.Width % aspectRatio.X == 0) &&
(resolution.Height % aspectRatio.Y == 0);
}
VB.NET:
Public Shared Function ResolutionIsOfAspectRatio(resolution As Size,
aspectRatio As Point) As Boolean
Return ((resolution.Width Mod aspectRatio.X) AndAlso
(resolution.Height Mod aspectRatio.Y)) = 0
End Function
使用示例:
Size resolution = new Size(1920, 1080);
Point aspectRatio = new Point(16, 9);
bool result = ResolutionIsOfAspectRatio(resolution, aspectRatio);
Console.WriteLine(result);
我只是想确保我没有遗漏任何宽高比概念,这可能会在使用我写的函数时导致意外结果。
然后,我的问题是:对于所有情况,该算法是否正常?如果没有,我应该做哪些修改来正确执行此操作?
编辑:我注意到算法完全错误,它需要640x480作为16:9的宽高比。我没有详细了解如何计算这个基础知识。答案 0 :(得分:2)
您的计算出错。只需单独修改每个值并不验证宽高比。
e.g。
Size res = new Size(1920, 1080);
Point aspect = new Point(16, 9); //1080%9==0 valid and true
bool result = (res.Width % aspect.X == 0) &&(res.Height % aspect.Y == 0);
是真的但是
Point aspect = new Point(16, 10); //1080%10==0 invalid and true!
也是如此。
正确的计算方法是
bool result = res.Width / aspect.X == res.Height / aspect.Y; //1920/16 == 1080/9