由两个整数除以不返回预期结果 [英] Dividing by two integers does not return expected result

问题描述

我目前正在写一个需要实时显示的预览程序，但预览，当然是按比例缩小。然而，当我缩放图片框下来，大小不正确。对于规模为正确的宽度和高度必须在4：3的比例。下面的代码：

I'm currently writing a program that requires a preview of a live display, but the preview, of course, is scaled down. However, when I scale the PictureBox down, the size is incorrect. For the scale to be correct the width and height need to be at a 4:3 ratio. Here's the code:

private void FindOptimalRes(PictureBox picBox)
{
    double h = Height / 4;
    double ratio = 4 / 3;
    picBox.Size = new Size((int)(h * ratio), (int)h);
}

在测试中，身高（形式的高度）为400，所以，新的大小的宽度应为133。但它始终被调整至100倍; 100！为什么呢？

In testing, Height (the height of the form) is 400, so, the width of the new size should be 133. But it always gets resized to 100×100! Why?

推荐答案

4 和 3 都是 INT S，所以它被转到 1 。让他们的东西浮点：

4 and 3 are both ints, so it gets turned to 1. Make them something floating-point:

double ratio = 4.0 / 3.0;

请注意，你也犯同样的错误与身高（也没关系，现在，但它会 - 将其更改为 4.0 ）。如果这是实际的代码，为什么由四个鸿沟由四个一遍吗？

Note that you're also making the same mistake with Height (it doesn't matter right now, but it will - change it to 4.0). And if this is the actual code, why divide by four to multiply by four again?

private void FindOptimalRes(PictureBox picBox)
{
    picBox.Size = new Size(Height / 3, Height / 4);
}

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