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AppGameKit Classic Chat / Rotate sprite towards current mouse location

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anwserman
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Joined: 20th May 2011
Location: Wisconsin
Posted: 16th Dec 2011 09:39 Edited at: 16th Dec 2011 09:55
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I'm currently trying to figure this out in AppGameKit, with no avail. But as a simple example, let's say I have an arrow placed in the middle of the screen. It's location is fixed towards the middle, but I want it to rotate towards and point at the current cursor position.

How can I go about doing this? I figured I could try it via cos/sin (make three points from the info and form a triangle), but it isn't working the way I planned. Any suggestions?

EDIT: Found a post on MSDN and found a solution that applied to AGK:



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BatVink
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Joined: 4th Apr 2003
Location: Gods own County, UK
Posted: 16th Dec 2011 12:17
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Thanks for sharing the answer with the community- it's so much better than "I got it, please delete this post"

I had a similar angle problem which I'll share. I needed to know the smallest angle between 2 points on a circle, so I could rotate the circle from one point to the other...



The sign tells you which way to rotate, the value tells you by how far.

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Hodgey
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Posted: 16th Dec 2011 12:30
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Just adding to answerman's code, the +180 bit is an angle offset and will vary depending which way the object in your image is facing. For example a ship facing to the left will have a different offset to one facing to the right.

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anwserman
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Posted: 16th Dec 2011 23:33
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Haha thanks Hodgey. I didn't even think of that, my sprite was pointing upwards when I created it

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baxslash
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Posted: 17th Dec 2011 07:55 Edited at: 17th Dec 2011 07:56
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This code will need an aspect ratio adjustment when using a percentage based resolution too:


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