I will keep this short, I am making a Tower Defence game as a mini project while I have some spare time and I am trying to figure out how I can implement the towers to be able to shoot the enimies when they come into range using dist but I just don't know how to implement a method that uses the enimies position and the towers position. I have an ArrayList of CreepSprites and Towers
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If someone could give me some guidence as to how I would go about making the towers able to shoot the Creeps that would be great, even if it doesn't get rid of them, just able to shoot at them would be great.
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2 Answers
@GoneUp's answer is in the right direction. In Processing you have a class called PVector which provides a distance method as well: dist()
I warmly recommend Daniel Shiffman's Nature of Code chapter on Vectors.It's a little bit of linear algebra, but it's super useful, especially for games so worth getting the hang of it early.
For example, to shoot a bullet, you will need to workout the direction towards.You can do that by using vector subtraction.
Additionally, you probably want to control how fast the bullet moves on screen towards that direction. That can also be done by normalising the vector: keeping it's direction, but reducing it's size to 1.0:
After that point it's easy to scale (multiply) the vector to any size you want.
If you know the tower's position, you simply need to add this scaled velocity to compute where the bullet should be drawn each frame.
PVector already has a function that does both: setMag().(set mag is short for set magnitude (or vector length))
It also provides a heading() function which is handy to workout the angle.
Here's a basic proof of concept:
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You can actually play with a preview bellow:
Have fun with PVectors ! :)One important note: the above code is a proof of concept and not optimized.On the long run with a lot of towers and enemies it will slow down.Once you get the math/code right, you can start doing a few improvements:
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- manage bullets/instances (e.g. re-use bullets that are off screenrather than creating new instances all the time)
- use the squared distance via magSq() instead and the squared radius to speed up calculations
You could use the Point2D class to represent the x,y coordinates of your figures. The class got a pre-implemented distance method wich can be checked against a radius.