Re: HardonCollider usage
Posted: Tue Nov 01, 2011 8:51 pm
Don't do that: it will make things really slow! It's not a scanning grid, but the "bucket size" of a field of buckets that is used as first step to decide whether two shapes collide or not:Kazagha wrote:I have tried increasing the size of the scanner line, changed to "HC.init(5, on_collision)" down from 100, as I was of the understanding that it's the size of the scanning grid, I don't know why it won't detect the collision.
Each shape is contained in at least one bucket. To find all shapes that might collide with a shape A, you simply have to look what other shapes are in the same buckets as A. That way, you don't have to check every other shape as collision candidate.
But if the buckets are too small, HC has to look at a lot of buckets, possibly even more than there are shapes.
A good bucket size would be that of the largest object in the game.
As for collision dispatching, I use this method:
Code: Select all
function on_collide(_,a,b,dx,dy)
a.object:collideWith(b.object, dx,dy)
b.object:collideWith(a.object, dx,dy)
end
function stop_collide(_,a,b,dx,dy)
a.object:stopCollide(b.object, dx,dy)
b.object:stopCollide(a.object, dx,dy)
end
function make_collidable(class)
class._onCollide = {}
class._onStopCollide = {}
function class:onCollide(group, reaction)
self._onCollide[group] = reaction
end
function class:onStopCollide(group, reaction)
self._onStopCollide[group] = reaction
end
function class:register(group, onCollide, onStop)
class:onCollide(group, onCollide)
class:onStopCollide(group, onStop)
end
function class:collideWith(other,dx,dy)
(self._onCollide[other.group] or self._onCollide["*"] or _NULL_)(self, other, dx,dy)
end
function class:stopCollideWith(other,dx,dy)
(self._onStopCollide[other.group] or self._onStopCollide["*"] or _NULL_)(self, other, dx,dy)
end
endCode: Select all
Scrap = Class{function(self, x,y)
self.sprite = math.random(1, #Scrap.sprites.frames)
self.shape = HC.addCircle(x,y,12)
self.shape.object = self
self.group = "Scrap"
self.rotvel = (math.random() * 2 - 1) * .5
self.velocity = vector(10,0):rotate_inplace(math.random() * 2 * math.pi)
self.velocity = vector(0,0)
HC.setPassive(self.shape)
Entities.add(self, Entities.MID)
end}
Scrap.sprites = newAnimation(Image.scrap, 32,32, 0,6)
make_collidable(Scrap)
function Scrap:draw()
love.graphics.setColor(1,1,1)
local x,y = self.shape:center()
Scrap.sprites:drawFrame(self.sprite, x,y, self.shape:rotation(),1,1, 16,16)
end
function Scrap:update(dt)
self.shape:move((self.velocity * dt):unpack())
self.shape:rotate(self.rotvel * dt)
end
local spoken = {}
local messages = {
"don't listen to her",
"it's a trap!",
"she only wants consume you",
"stay here",
"stay with us",
"all the others are dead",
}
local bag = Randombag(1,#messages)
bag.bag = {2,1}
Scrap:onCollide("Magnet", function(self)
if not spoken[self] then
local t = Textfader(messages[bag:next()], Font[60], 2.5, .1, .2, vector(self.shape:center()))
spoken[self] = true
end
end)
Scrap:onCollide("Bomb", function(self,other,dx,dy)
if not self.magnet then return end
self.magnet:scrapHitBomb(vector(other.shape:center()), vector(dx,dy))
end)