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78 lines
1.9 KiB
78 lines
1.9 KiB
/*
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* super class for any enemy in the game
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* a enemy can spawn at a random location along the border of the map
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* a enemy can also calculate the distance and angle to the player
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* 5-23-16
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*/
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package tanks;
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public abstract class Enemy extends Living
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{
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public Enemy()
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{
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super();
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}
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public abstract void move();
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/*
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* enemy spawns at a random location on boarder of map. Random number 1-4
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* to determine which edge of map enemy spawns. Random number code to
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* determine how far down or how far over player spawns on given edge.
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*/
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public void spawn(int w, int h)
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{
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int temp=(int)(Math.random()*(4)) + 1;
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if(temp==1)
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{
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y=0;
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x=(int)(Math.random()*(w));
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}
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else if(temp==2)
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{
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y=(int)(Math.random()*(h));
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x=w;
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}
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else if(temp==3)
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{
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y=h;
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x=(int)(Math.random()*(w+1));
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}
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else
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{
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x=0;
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y=(int)(Math.random()*(h - 200));
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}
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}
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/*
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* Used right triangle algebra to determine distance from x,y of enemy
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* to x,y of player.
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*/
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public double distToPlayer(RotationalElement p)
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{
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double d, a, b;
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a=Math.abs(x-p.x);
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b=Math.abs(y-p.y);
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d=Math.sqrt(a*a+b*b);
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return(d);
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}
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/*
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* Found lengths of imaginary triangle between player and enemy.
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* Then used inverse trig to determine angle.
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*/
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public double angleToPlayer(RotationalElement p)
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{
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double a, b, ang;
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a=(x-p.x); //doesnt have to me absolute value since using atan2
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b=(y-p.y);
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ang=Math.atan2(b,a); //atan2 prevents divisible by zero errors
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ang = Math.toDegrees(ang);
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return(ang);
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}
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}
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