我该如何解释PDF中矩形的坐标？ [英] How should I interpret the coordinates of a rectangle in PDF?
问题描述
我想了解更多关于矩形坐标的信息，特别是
：
I would like to know more about the coordinates of a Rectangle, in particular:
- 左下X
- 左下Y
- 右上角X
- 右上角Y
- lower left X
- lower left Y
- upper right X
- upper right Y
每次，我都会对如何根据这些坐标绘制尺寸来绘制矩形感到困惑。
Every time, I get confused about how to make dimensions based on these coordinates to draw rectangle.
如果可能，我可以简要地获得关于这些坐标位置的图形表示吗？
If possible, can I get a graphical representation briefly about these coordinates positions?
推荐答案
在某人可以解释左下角的X之前，左边的Y，右上角X和右上角Y是关于坐标系的： PDF页面的Origin（x，y）在哪里？
Before someone can explain what the lower-left X, lower-left Y, upper-right X and upper-right Y of a rectangle are about, you need to know about the coordinate system: Where is the Origin (x,y) of a PDF page?
答案该问题包含您需要的所有信息，除了您要求的图形表示。这是坐标系的简单表示：
The answer to that question contains all the information you need, except for the graphical representation you are asking for. This is a simple representation of the coordinate system:
坐标系的原点是（0,0）。正X值位于原点右侧，正Y值位于原点之上。
The origin of the coordinate system is (0, 0). Positive X values are to the right of the origin, positive Y values are above the origin.
我绘制了一个 Rectangle 并指示您可以在哪里找到左下角（坐标（llx，lly））和右上角（坐标 （urx，ury））。
I have drawn a Rectangle and indicates where you can find the lower-left corner (with coordinate (llx, lly)) and the upper-right corner (with coordinate (urx, ury)).
矩形的边与X轴和Y轴平行，因此您只需要两个坐标来定义矩形。
The sides of the rectangle are always in parallel with the X and the Y axis, hence you only need two coordinates to define the rectangle.
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