1 files changed, 82 insertions, 0 deletions
diff --git a/bloodParticle.lua b/bloodParticle.lua
new file mode 100644
index 0000000..12aa2af
--- /dev/null
+++ b/bloodParticle.lua
@@ -0,0 +1,82 @@
+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