如何在模板剪裁上设置线宽 [英] How to set line width on template clipping

问题描述

我有一些 PdfTemplate ，我想将其形状剪辑到某个路径。我知道怎么做，但剪切线总是相同的（可能是1像素），我希望能够改变它。有没有办法做到这一点？像调整大小模板这样的一半措施将无法解决问题。

I have some PdfTemplate and I want to clip its shape to some path. I know how to do this, but the clipping line is always the same (probably 1 px) and I want to be able to change it. Is there any way to do this? Half-measures, like resizing template will not do the trick.

一段代码：

PdfTemplate template = contentByte.CreateTemplate(100, 200);
template.MoveTo(0, 0);
template.LineTo(50, 50);
template.LineTo(50, 0);
template.LineTo(0, 50);
template.SetLineWidth(5);
template.Clip();
Image img = Image.getInstance(RESOURCE);
template.Add(img, 0, 0);

SetLineWidth（）显然不起作用。 C＃和Java答案都有帮助。

SetLineWidth() obviously doesn't work. Both C# and Java answers will help.

编辑：在这种情况下，我们有三角形img。如果我们想要像这样剪辑这个图像但不改变坐标（我想在10上设置线宽）该怎么办：

In this scenario we have img in triangle. What if we want to clip this image like this, but without changing coordinates (I would like to set line width on 10):

template.LineTo(45, 45);
template.LineTo(45, 0);
template.LineTo(0, 45);

推荐答案

问题＃1：你永远不会抚摸这条路，因此永远不会画出来。首先尝试这个：

Problem #1: You never stroke the path, hence it is never drawn. First try this:

PdfTemplate template = contentByte.CreateTemplate(100, 200);
template.MoveTo(0, 0);
template.LineTo(50, 50);
template.LineTo(50, 0);
template.LineTo(0, 50);
template.SetLineWidth(5);
template.Clip();
Image img = Image.getInstance(RESOURCE);
template.Add(img, 0, 0);
template.Stroke();

问题＃2：您正在将剪切路径用于两个不同的目的。

Problem #2: You are using your clipping path for two different purposes.

1. 在添加图像时切出形状。


2. 绘制路径。

1. To cut out a shape when adding an Image.
2. To draw the path.

看起来不对。我不确定每个PDF查看器是否会实际描绘该路径，因为您明确使用该路径来剪辑内容。

That doesn't look right. I'm not sure if every PDF viewer will actually stroke that path as you clearly use that path to clip content.

我会像这样编写这样的代码：

I would write this code like this:

PdfTemplate template = contentByte.CreateTemplate(100, 200);
template.MoveTo(0, 0);
template.LineTo(50, 50);
template.LineTo(50, 0);
template.LineTo(0, 50);
template.Clip();
template.NewPath();
Image img = Image.getInstance(RESOURCE);
template.Add(img, 0, 0);
template.MoveTo(0, 0);
template.LineTo(50, 50);
template.LineTo(50, 0);
template.LineTo(0, 50);
template.SetLineWidth(5);
template.Stroke();

第一次使用路径作为剪切路径。为剪切路径定义线宽是没有意义的：路径定义了需要剪切的形状。

The first time, you use the path as a clipping path. It doesn't make sense to define a line width for a clipping path: the path defines the shape that needs to be cut out.

第二次，你使用描边形状边界的路径。制作这些边框的线条具有宽度。请注意，您只绘制了三行。你可能想关闭路径！

The second time, you use the path to stroke the borders of a shape. The lines that make these borders have a width. Note that you're only drawing three lines. You may want to close the path!

这也很奇怪：

template.LineTo(45, 45);
template.LineTo(45, 0);
template.LineTo(0, 45);

这不会绘制三角形！

这些行应该像这样更正：

These lines should be corrected like this:

template.MoveTo(0, 45);
template.LineTo(45, 45);
template.LineTo(45, 0);
template.LineTo(0, 45);

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