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我正在尝试在 Lua(Codea)中构建“缩放以适应”算法。想象一下 Canvas 上任意位置的形状。我想自动放大这个形状的中心,使其占据画布的大部分并以它为中心。最后,我希望能够缩小到初始情况,所以矩阵应该可以完成这项工作。有没有一种简单的方法可以做到这一点?欢迎任何代码,即使不是 Lua 代码。

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1 回答 1

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在 C# 中,

double aspectRatio = shape.Width / shape.Height;

if (aspectRatio > 1)
{
    // Width defines the layout
    double origShapeWidth = shape.Width;
    shape.Width = panel.Width;
    shape.Height = panel.Width * shape.Height / origShapeWidth;

    // Center the shape
    double margin = (panel.Height - shape.Height) / 2;
    shape.Margin = new Thickness(0, margin, 0, margin);
}
else
{
    // Height defines the layout
    double origShapeHeight = shape.Height;
    shape.Height = panel.Height;
    shape.Width = panel.Height * shape.Width / origShapeHeight;

    // Center the shape
    double margin = (panel.Width - shape.Width) / 2;
    shape.Margin = new Thickness(margin, 0, margin, 0);
}
于 2013-08-04T23:30:06.843 回答