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Dark GDK / Finding an angle in 2d space

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EddieV223
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Joined: 24th Sep 2010
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Posted: 1st Oct 2010 07:56
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I'm getting ready to program some AI in the game I am making and I need to be able to get the angle that points from one point (the AI's sprite) to another point (the player's sprite) this is math question I am not sure if there is a db function for this or if I'll have to write one myself. If so I'll need some help figuring out the mathematics.


thanks

Learning c++ is a biznatch!
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Abraxas77
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Posted: 1st Oct 2010 16:04
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If you have two points A and B, the following will give the angle between line AB and the x-axis (horizontal axis):

angle = atanf(xB-xA, yB - yA);

This angle will be in radians; to convert it into degrees:

angleDegrees = 180.0f / PI;


http://en.wikipedia.org/wiki/Angle
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Diggsey
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Posted: 1st Oct 2010 17:10
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atan2f not atanf

[b]
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Dodga
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Posted: 1st Oct 2010 22:04
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Doing 2.5d is much easier IMO, you can still use images but you use planes in 3d to make those images, its easier because you can just go
dbPointObject(1, x, y, z);
angle=dbObjectAngleY(1);
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Neuro Fuzzy
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Posted: 5th Oct 2010 10:41
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I love layered topology - you can have 1 flat layer for the ground, and a second slanted layer for stairs connecting the first layer to a third layer above the first. Any object moving taking one layer into account, you really only need to worry about the 2d top-down case.


Still, 3d rotation is pretty cool, just a pain in the butt.

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