java2d 对象的非破坏性转换
我希望能够在由 Path2D.Double 组成的 Java2D 场景上缩放和取消缩放，而无需 只需扩大距离即可加粗线条。
我尝试对 PaintComponent 方法接收的 Graphics2D 对象应用转换，但这会使线条更粗。我发现的唯一方法是对线条应用转换（例如 line.transform(AffineTransform.getScaleInstance(2d,2d))），但每次我再次缩放和取消缩放时，我都会丢失信息，因为的浮点错误。
长话短说：这种转变是破坏性的。有没有办法说“我想在不修改线条内容的情况下应用该转换来绘制这条线”？
I would like to be able to zoom and unzoom on a Java2D scene made of Path2D.Double without
thickening the lines, just by dilating the distances.
I'v tried to apply a transformation to the Graphics2D object the paintComponent method receives, but this makes the lines thicker. The only way I found was to apply a transformation to the lines (line.transform(AffineTransform.getScaleInstance(2d,2d)) for instance) but every time I zoom and unzoom again, I lose information because of floating point errors.
To make a long story short: the transformations are destructive. is there a way to say "i want to draw this line with that transformation applied without modifying the content of the line"?
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我找到了解决方案：我根据 Graphic2D 中的比例因子更改线宽，这样我可以将变换应用于 Graphic2D 本身，并且不会破坏 Path2D 中包含的原始坐标。
I found the solution: I change the line width according to the scale factor in Graphic2D, that way I can apply the transform to Graphic2D itself and it doesn't destruct the original coordinates contained in the Path2D.
正如您所发现的，更改
Graphics2D变换会影响所有绘图，但不妨碍在paintComponent()内保存、修改和恢复变换。在此示例中，内容是在缩放的上下文中绘制的，而目标对象周围的 Rectangle.Double未缩放绘制。附录：示例使用显式转换，但您可以使用
AffineTransform，而不是。与 Rectangle2D 一样，Path2D 实现了 Shape 接口，因此您可以使用createInverse()和createTransformedShape()，相应地。这是一个相关的示例。As you found, changing the
Graphics2Dtransform affects all drawing, but nothing precludes saving, modifying and restoring the transform insidepaintComponent(). In this example, the content is drawn in a scaled context, while aRectangle.Doublesurrounding the target object is drawn unscaled.Addendum: The example uses explicit transformations, but you can use
AffineTransform, instead. LikeRectangle2D,Path2Dimplements theShapeinterface, so you can usecreateInverse()andcreateTransformedShape(), accordingly. Here's a related example.