Circle enemy detection in TD game

Question

I'm working on a Java tower defense game, but I've got a problem: I cant make the tower find enemies within a circle. My code:

if(twrsq.intersects(GameScreen.enemies[i])) {
    shooting = true;
    shotEnemy = i;
}
this.twrsq = new Rectangle(
    x - (twrsqsize/2), y - (twrsqsize/2),
    width + twrsqsize, height +  twrsqsize);

twrsq holds the current rectangle; this needs to be a circle. GameScreen.enemies[i] holds a rectangle too. I'm trying to make a circle from twrsq and make them intersect with the enemy.

How can I accomplish this?

Edit: I got it kinda working; I got now this screenshot:

if(cir.intersects(GameScreen.enemies[i])) {
    shooting = true; shotEnemy = i;
}

score 2 · Accepted Answer · answered Oct 20 '12 at 22:38

2

Both java.awt.Rectangle and java.awt.geom.Ellipse2D implement the Shape interface. The latter's contains() method may be useful.

answered Oct 20 '12 at 22:38

trashgod

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Can you explain further please? – Jeffrey Barneveld Oct 20 '12 at 22:39
There's an example using `Rectangle` [here](http://stackoverflow.com/a/6810665/230513); there's an example using `Ellipse2D` [here](https://sites.google.com/site/drjohnbmatthews/scaledview). – trashgod Oct 20 '12 at 22:43
I'm working with shape now how can i draw an outline of them like the borders? – Jeffrey Barneveld Oct 20 '12 at 22:55
1

`Graphics#draw()` for the outline; `Graphics#fill()` for the interior. – trashgod Oct 20 '12 at 23:04
ok ty :) another question: I got it kinda working i got now this:screenshotuploader.com/s/01/2a383Cl1x if(cir.intersects(GameScreen.enemies[i])) shooting = true; shotEnemy = i; } – Jeffrey Barneveld Oct 20 '12 at 23:13

Circle enemy detection in TD game

1 Answers1