itext设置pdf的尺寸_itextpdf：矩形修改宽度

最新推荐文章于 2025-04-21 20:32:19 发布

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#itext设置pdf的尺寸

这篇博客探讨了在使用iText库时，如何避免使用Ambiguous的setWidth()方法来设置矩形宽度。作者建议通过setLeft()和setRight()明确调整边界，以消除方向不确定性。

Is it possible to modify width of existing rectangle ?

I have :

@Override

public void onGenericTag(PdfWriter writer, Document document, Rectangle rect, String text){

Rectangle rectangle = new Rectangle(rect);

//something like that :

rectangle.setWidth(400f);

}

解决方案

You can (and should) not use a method called setWidth(). Whatever that method would do would be very ambiguous.

Suppose that you would have a rectangle with lower-left x coordinate equal to 36 and with upper-right x coordinate equal to 559. (I didn't choose these numbers at random: those are the default margins inside the default A4 page when using iText.) Now when you change the width of such a rectangle: do you mean to extend the rectangle to the left, to the right, or both? I hope this example shows that having a setWidth() method doesn't make sense.

Instead, you should use setLeft() or setRight() when you change the x value of the left or right coordinate of the rectangle, you automatically change the width and there can be no confusion about the direction in which you're changing the width.