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  Shooting at angles at constant velocity.  (Read 1375 times)
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Offline cubemaster21
« Posted 2012-04-17 02:01:37 »

I honestly have no idea where to begin with coding this. I want to be able to move something at the same speed, no matter what angle. No matter if it's 45* or 23*. Any help?

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Offline sproingie

JGO Kernel


Medals: 202



« Reply #1 - Posted 2012-04-17 02:05:37 »

I don't quite understand.  Velocity should be constant regardless of direction.  If you're looking to break the x and y components out to see how much to displace something based on a velocity, just multiply by sin and cosine, like so:

dx = velocity * cos(angle)
dy = velocity * sin(angle)

Keep in mind angles are usually in radians, not degrees.  OpenGL being the exception when using the fixed function pipeline.

Offline cubemaster21
« Reply #2 - Posted 2012-04-17 02:08:09 »

Well, the reason it might not make sense is because i've been using slope to move around the character.

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Offline DrZoidberg

Senior Duke


Medals: 15



« Reply #3 - Posted 2012-04-17 02:17:50 »

If you already have a dx and dy and want to change the speed you can do this
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double speed = Math.sqrt(dx*dx + dy*dy);
dx = dx / speed * newSpeed;
dy = dy / speed * newSpeed;
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