在ImageView中居中图像 [英] Centering an image in an ImageView

问题描述

我目前正在尝试使用JavaFX将图像置于ImageView中心。

I am currently trying to center an image in an ImageView using JavaFX.

所以我在视图中加载图像：

So I load the image in the view :

Image img = new Image("...");
imageView.setImage(img);

让我们假设图像很大（2000x3000）而不是ImageView（400x100）

and let's suppose the image is huge (2000x3000) and not the ImageView (400x100)

渲染的图像将在左侧对齐，我想放在ImageView的中心：

The rendered image will be aligned on the left, and I would like to put in the center of the ImageView :

< a href =https://i.stack.imgur.com/nKIWz.jpg =nofollow noreferrer>

无论如何都要执行此操作？

Is there anyway to perform that ?

推荐答案

因此，经过几天的计算，我找到了一个很好的方法来做到这一点。

So, after days of calculation, I managed to find a good way to do it.

我在这里发布，以防有​​人想要实现它。

I post it here in case of someone would like to achieve it.

我创建了一个只需要访问imageView的方法：

I created a method that only needs access to the imageView :

public void centerImage() {
        Image img = imageView.getImage();
        if (img != null) {
            double w = 0;
            double h = 0;

            double ratioX = imageView.getFitWidth() / img.getWidth();
            double ratioY = imageView.getFitHeight() / img.getHeight();

            double reducCoeff = 0;
            if(ratioX >= ratioY) {
                reducCoeff = ratioY;
            } else {
                reducCoeff = ratioX;
            }

            w = img.getWidth() * reducCoeff;
            h = img.getHeight() * reducCoeff;

            imageView.setX((imageView.getFitWidth() - w) / 2);
            imageView.setY((imageView.getFitHeight() - h) / 2);

        }
    }

这篇关于在ImageView中居中图像的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！