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local BloodParticle = {}
BloodParticle.__index = BloodParticle
local SHRINK_RATE = 6
local GRAVITY = 300
local PARTICLE_COUNT = 32
local BURST_SPEED_MIN = 40
local BURST_SPEED_MAX = 160
local BLOOD_COLORS = {
{0.22, 0.38, 0.22, 1},
{0.18, 0.30, 0.18, 1},
{0.28, 0.44, 0.28, 1},
{0.14, 0.22, 0.14, 1},
}
local GLOW_COLOR = {0.05, 0.7, 0.05, 0.0} -- meh
function BloodParticle.new(x, y, radius, color, vx, vy)
local self = setmetatable({}, BloodParticle)
self.x = x
self.y = y
self.radius = radius
self.initialRadius = radius
self.color = color
self.vx = vx or 0
self.vy = vy or 0
self.stuck = false
self.kill = false
return self
end
function BloodParticle:update(dt, isSolidAt)
if self.stuck or self.kill then return end
self.x = self.x + self.vx * dt
self.y = self.y + self.vy * dt
self.vy = self.vy + GRAVITY * dt
self.radius = self.radius - SHRINK_RATE * dt
local hitWall = isSolidAt and isSolidAt(self.x, self.y)
if hitWall or self.radius <= self.initialRadius * 0.5 then
self.stuck = true
self.radius = math.max(self.radius, self.initialRadius * 0.35)
self.vx, self.vy = 0, 0
return
end
if self.radius <= 0 then
self.kill = true
end
end
function BloodParticle:draw()
if self.kill then return end
love.graphics.setBlendMode("add")
love.graphics.setColor(GLOW_COLOR)
love.graphics.circle("fill", self.x, self.y, self.radius * 2.2)
love.graphics.setBlendMode("alpha")
love.graphics.setColor(self.color)
love.graphics.circle("fill", self.x, self.y, self.radius)
love.graphics.setColor(1, 1, 1, 1)
end
function BloodParticle.burst(x, y)
local particles = {}
for _ = 1, PARTICLE_COUNT do
local angle = math.random() * math.pi * 2
local speed = BURST_SPEED_MIN + math.random() * (BURST_SPEED_MAX - BURST_SPEED_MIN)
local vx = math.cos(angle) * speed
local vy = math.sin(angle) * speed - 40
local radius = 1.5 + math.random() * 8.0
local color = BLOOD_COLORS[math.random(#BLOOD_COLORS)]
table.insert(particles, BloodParticle.new(x, y, radius, color, vx, vy))
end
return particles
end
return BloodParticle
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