Generally speaking, it is very troublesome to measure dimensions of objects on the desktop with a real ruler. You can try powerful Mac pixel ruler program, also called Ondesoft Screen Ruler for Mac. Ondesoft Screen Ruler on your Mac OS allows you to accurately measure all your on-screen elements. This ruler will tell you the dimensions in pixels precisely.
You can measure any oblique object with this ruler. All you need is to "Set angle" for the ruler.
Another solution: Ondesoft Screen rulers contain a Protractor ruler. So you could measure the angle first, and then input it to measure the length of oblique objects.
The interface is displayed as below:
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Mac screen virtual ruler
As a web designer, I can say that Ondesoft screen rulers is by far the best measuring program I have ever found to measure objects or angles accurately and conveniently.
From Turkey Erick
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