Shortest turn angle vs target angle

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Pakz	Created : 27 October 2019 Language : Monkey2 Shortest turn angle vs target angle Get distance between angle and target angle. (turrets/homing missiles)
#Import "<std>" #Import "<mojo>" Using std.. Using mojo.. Class MyWindow Extends Window Method New() 'Our target angle Local target:Float=Pi+0.5 'Our angle Local angle:Float=TwoPi-0.2 Print angledifference(target,angle) End method Method OnRender( canvas:Canvas ) Override App.RequestRender() ' Activate this method ' if key escape then quit If Keyboard.KeyReleased(Key.Escape) Then App.Terminate() End Method End Class ' Return a float value which is negative if the distance between the angle ' and target angle is shorter. Positive value if the right turn is shorter. ' Uses for homing missiles and turrets etc. ' returns - distance float Function angledifference:Float(target:Float,angle:Float) ' Our difference (Negative if left target angle is shorter or positive if right turn is closer) Local difference:Float = target - angle While (difference < -Pi) difference += TwoPi Wend While (difference > Pi) difference -= TwoPi Wend Return difference End Function Function Main() New AppInstance New MyWindow App.Run() End Function --v
Latest Update A couple of years ago I used a for loop and counted how many steps were in a turn to the left side or right side towards the target angle. I now found some code that returns the distance between a angle and target angle. The function in the code returns a negative float value if the turn to the left is closer and positive if the turn to the right is closer. The value is the actual angle difference. I have already used this function in a game where it is used to rotate homing missiles towards the player. The version here is in monkey2 code and it uses radians. To convert to the other angle version you would need to change the Pi and TwoPi inside the function to degrees. this is *180/Pi I think it was? You might need to look that up.

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Monday, 28 October 2019, 17:13
Jayenkai	A handy function to have, and useful in other scenarios, too. Eg, ships battling each other, whilst screen-wrapping is in effect, so the enemy knows the shortest distance including taking a shortcut.

Shortest turn angle vs target angle

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