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September 19th, 2018, 04:45 AM   #1
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Calculating the points of an arrow

I'm assigned a problem where I need to calculate the points for a rendering program.

These are the conditions I have to work with:
* The arrow consist of two random points
* At the second point, I need to find the two points that are X distance away under an angle of 45 degrees in either direction
* I have to take into consideration the thickness of the lines that connect these points

An image displaying this is added as attachment.
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File Type: jpg arrow.jpg (4.6 KB, 7 views)

Last edited by skipjack; September 19th, 2018 at 06:20 AM.
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September 19th, 2018, 06:37 AM   #2
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Quote:
Originally Posted by mathboy123 View Post
The arrow consist of two random points
An image displaying this is added as attachment.
In the attachment, the arrow isn't just two points, but a very thick line that is pointed at one end, with side-arms attached at that end.

Where exactly are the points A and B, taking the thickness of the line into account?

I suggest you first calculate a point E on the line, positioned so that BE can be treated as a vector of length X. You can then rotate BE by 45 degrees and by -45 degrees. Must all the lines in the diagram have approximately the same width?
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September 27th, 2018, 09:51 AM   #3
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Last edited by theHeavyLobster; September 27th, 2018 at 10:05 AM. Reason: added a formula
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