66 lines
1.4 KiB
Lua
66 lines
1.4 KiB
Lua
ball = {
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__count = 0,
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id = nil,
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pos = vec2:new(0,0),
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last_pos = vec2:new(0,0),
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vel = vec2:new(0,0),
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rad = 1,
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col = 7,
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mass = function(self)
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return self.rad
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end,
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draw = function(self, shadow)
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if (shadow == true) then
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circfill(self.last_pos.x, self.last_pos.y, self.rad, self.col + 8)
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end
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circfill(self.pos.x, self.pos.y, self.rad, self.col)
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end,
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move = function(self)
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self.last_pos = self.pos
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self.pos += self.vel
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end,
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edge_bounce = function(self)
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edge_normal = vec2:new()
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for axis in all({"x","y"}) do
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val = self.pos[axis]
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if (val - self.rad < 0) then
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self.pos[axis] = self.rad
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edge_normal[axis] = 1
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elseif (val + self.rad > 127) then
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self.pos[axis] = 127 - self.rad
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edge_normal[axis] = -1
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end
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end
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if (edge_normal.x != 0 or edge_normal.y != 0) then
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self.vel = self.vel:bounce(edge_normal)
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end
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end,
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check_collisions = function(self, balls)
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for b in all(balls) do
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if (b.id != self.id and (collisions[b] == nil or collisions[b][self] == nil)) then
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local diff = self.pos - b.pos
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if (diff:length() < self.rad + b.rad) then
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collisions[self] = collisions[self] or {}
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collisions[self][b] = diff
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end
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end
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end
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end,
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}
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ball.__index = ball
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function ball:new(o)
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ball.__count += 1
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local o = o or {}
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o.id = ball.__count
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o.col = o.col or o.id % 8
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setmetatable(o, self)
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o.__index = self
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return o
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end
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