diff options
Diffstat (limited to 'obj.lua')
| -rw-r--r-- | obj.lua | 33 |
1 files changed, 33 insertions, 0 deletions
@@ -202,6 +202,39 @@ function obj:energy() return 1 + avel*avel + vx*vx + vy*vy end +function obj:observe_avel(o) + return o.data.avel - self.data.avel +end + +function obj:observe_vel(o) + local vx, vy = unpack(self.data.vel) + local ovx, ovy = unpack(o.data.vel) + return ovx - vx, ovy - vy +end + +function obj:observe_pos(o) + local px, py = unpack(self.data.pos) + local opx, opy = unpack(o.data.pos) + return opx - px, opy - py +end + +function obj:avel_to_accel(o, ax, ay) + local ovx, ovy = self:observe_vel(o) + local nvx, nvy = ovx + ax, ovy + ay + local v = util.magnitude{ovx, ovy} + local nv = util.magnitude{nvx, nvy} + local ne = v*v - nv*nv + local avel = self:observe_avel(o) + local ave = avel*avel + ne + if ave < 0 then + return false + end + local vx, vy = unpack(self.data.vel) + o.data.avel = self.data.avel + (math.sqrt(ave) * (avel >= 0 and 1 or -1)) + o.data.vel = {vx + nvx, vy + nvy} + return true +end + function obj:in_hitbox(px, py) local x, y = unpack(self.data.pos) local dx, dy = x - px, y - py |