destination prototype
also ship bounds resets
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@ -466,9 +466,7 @@ ship_m = mknew{
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-- xmin, xmax, ymin, ymax:
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-- movement constraints
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-- enforced by `constrain`.
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xmin = 0, xmax = 104,
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-- ymin, ymax default to nil
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-- pship needs more constraint
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xmin = 0, xmax = 104, ymin = 0, ymax = 120
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}
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function ship_m:die()
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@ -510,6 +508,10 @@ function ship_m:brake_dist(v0)
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return (chunk_zone + overage * (tri_frames + 1)) * sgn(v0), (overage > 0) and tri_frames + 1 or tri_frames
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end
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function ship_m:reset_bounds()
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self.xmin, self.xmax, self.ymin, self.ymax = 0, 104, 0, 120
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end
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function ship_m:constrain(p, dp, pmin, pmax, want)
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if (not pmin) return want
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local v1, bd, bf, bp
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@ -615,6 +617,54 @@ function ship_m:refresh_shield()
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self.shield_refresh_ready = gframe + self.shieldcooldown
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end
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-->8
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-- paths
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-- destination: a point the
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-- center of a ship approaches
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destination = mknew{
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-- 0..1: a point on a line
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-- segment from the ship's
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-- flotilla spot to the player;
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-- -1 means center of play area
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anchor_frac=0,
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-- (0, 1]: relative to max
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-- acceleration, how quickly
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-- should the ship accelerate
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-- to its destination?
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-- 0: park here instead, using
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-- constraint following
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accel_frac=1,
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-- how far to lerp between the
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-- anchor and the screen bounds.
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-- this is the "destination"-y
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-- part of a destination.
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x_off_frac = 0,
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y_off_frac = 0
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}
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function lerp(a, b, f)
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return (1-f)*a+b*f
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end
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function destination:anchor(fx, fy)
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local af = self.anchor_frac
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if (af == -1) return 55,63
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return lerp(fx, primary_ship.x + 4, af), lerp(fy, primary_ship.y + 4, af)
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end
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function destination:target_from(fx, fy)
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local rx, ry = self:anchor(fx, fy)
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local xf, yf = self.x_off_frac, self.y_off_frac
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if (xf < 0) rx = lerp(rx, 0, -xf)
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if (xf > 0) rx = lerp(rx, 112, xf)
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if (yf < 0) ry = lerp(ry, 0, -yf)
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if (yf > 0) ry = lerp(ry, 128, yf)
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return rx, ry
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end
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-->8
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-- bullet and gun behaviors
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@ -1089,7 +1139,6 @@ player = mknew(ship_m.new{
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ymomentum = 0,
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maxspd = 1.5, -- momentum cap
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thrust = 0.1875, -- momentum added from button
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ymin = 0, ymax = 120, -- stay on screen
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drag = 0.0625, -- momentum lost per frame
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act = function(self) -- fetch buttons
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local b,th = btn(),self.thrust
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@ -1329,8 +1378,14 @@ ship_skirmisher = mknew(ship_f.new{
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sparks = smokespark,
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sparkodds = 3,
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fire_off_y = 7,
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xmin = -8,
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xmax = 112,
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})
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function ship_skirmisher:reset_bounds()
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self.xmin, self.xmax, self.ymin, self.ymax = -8, 112, 0, 120
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end
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function rnd_spawn_loc()
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local x,y = flr(rnd(304)), flr(rnd(32))
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if (x<184) return x-40,-y-8
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