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The width determines the width of lines drawn using methods like
AddLine and FrameRect.
The width is measured in points.
The AddLine method creates lines centered on the points you provide.
This means if you draw a horizontal line with a width of ten the
line will extend five points above your start position and five
points below it.
The FrameRect method draws lines outside the rectangle you provide.
So if you frame a rectangle using a width of ten, the drawn rectangle
will extend ten points above, below, to the left and to the right
of your specified rectangle. No drawing will fall within the rectangle.
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