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local LiquidSurface = {}
LiquidSurface.__index = LiquidSurface
local DEFAULT_COLORS = {
water = { 0.35, 0.65, 1, 0.5},
lava = { 1, 0.35, 0.1, 0.8 }
}
local function toNumber(value, fallback)
local number = tonumber(value)
if number == nil then
return fallback
end
return number
end
local function getSurfaceBounds(entity)
local polygon = entity and entity.polygon or nil
if not polygon or #polygon == 0 then
return entity.x or 0, entity.y or 0, entity.width or 0, entity.height or 0
end
local minX, minY = math.huge, math.huge
local maxX, maxY = -math.huge, -math.huge
for _, point in ipairs(polygon) do
local px = (entity.x or 0) + (point.x or 0)
local py = (entity.y or 0) + (point.y or 0)
minX = math.min(minX, px)
minY = math.min(minY, py)
maxX = math.max(maxX, px)
maxY = math.max(maxY, py)
end
return minX, minY, maxX - minX, maxY - minY
end
function LiquidSurface:new(source)
local self = setmetatable({}, LiquidSurface)
local properties = source.properties or {}
local x, y, width, height = getSurfaceBounds(source)
local configuredHeight = toNumber(properties.height, height)
self.x = x
self.y = y
self.width = math.max(2, width)
self.height = math.max(1, configuredHeight)
self.bottomY = self.y + self.height
self.type = "water"
self.liquidType = properties.liquid_type or "water"
self.color = DEFAULT_COLORS[self.liquidType] or DEFAULT_COLORS.water
self.tension = toNumber(properties.tension, 0.015)
self.dampening = toNumber(properties.dampening, 0.001)
self.spread = toNumber(properties.spread, 0.1)
self.propagationPasses = math.max(1, math.floor(toNumber(properties.passes, 8)))
self.maxSpeed = toNumber(properties.max_speed, 8)
self.maxWaveAmplitude = toNumber(properties.max_wave_amplitude, self.height * 0.4)
self.columnsLength = math.max(2, math.floor(self.width))
self.columns = {}
for _ = 1, self.columnsLength do
table.insert(self.columns, self:createColumn())
end
return self
end
function LiquidSurface:createColumn()
return {
height = self.height,
targetHeight = self.height,
speed = 0
}
end
function LiquidSurface:isFixedColumn(index)
return index <= 2 or index >= self.columnsLength - 1
end
function LiquidSurface:updateColumn(index, dtScale)
if self:isFixedColumn(index) then return end
local column = self.columns[index]
local heightDiff = column.targetHeight - column.height
local accel = self.tension * heightDiff - column.speed * self.dampening
column.speed = column.speed + accel * dtScale
column.speed = math.max(-self.maxSpeed, math.min(self.maxSpeed, column.speed))
column.height = column.height + column.speed * dtScale
local lo = column.targetHeight - self.maxWaveAmplitude
local hi = column.targetHeight + self.maxWaveAmplitude
column.height = math.max(lo, math.min(hi, column.height))
end
function LiquidSurface:splash(worldX, speed)
if worldX < self.x or worldX >= (self.x + self.columnsLength) then
return
end
local index = math.min(self.columnsLength, math.max(1, math.floor(worldX - self.x) + 1))
if self:isFixedColumn(index) then
return
end
self.columns[index].speed = self.columns[index].speed - (speed or 2)
end
function LiquidSurface:isTouched(x, y, dx, dy)
return math.abs(y - self.y) < math.abs(dy)
and x >= self.x
and x < (self.x + self.columnsLength)
end
function LiquidSurface:update(dt)
local dtScale = math.max(0, dt or 0) * 60
for i = 1, self.columnsLength do
self:updateColumn(i, dtScale)
end
local leftDeltas = {}
local rightDeltas = {}
for _ = 1, self.propagationPasses do
for i = 1, self.columnsLength do
if i > 1 and not self:isFixedColumn(i - 1) then
leftDeltas[i] = self.spread * (self.columns[i].height - self.columns[i - 1].height) * dtScale
self.columns[i - 1].speed = self.columns[i - 1].speed + leftDeltas[i]
end
if i < self.columnsLength and not self:isFixedColumn(i + 1) then
rightDeltas[i] = self.spread * (self.columns[i].height - self.columns[i + 1].height) * dtScale
self.columns[i + 1].speed = self.columns[i + 1].speed + rightDeltas[i]
end
end
for i = 1, self.columnsLength do
if i > 1 and not self:isFixedColumn(i - 1) and leftDeltas[i] then
self.columns[i - 1].height = self.columns[i - 1].height + leftDeltas[i]
end
if i < self.columnsLength and not self:isFixedColumn(i + 1) and rightDeltas[i] then
self.columns[i + 1].height = self.columns[i + 1].height + rightDeltas[i]
end
end
end
end
function LiquidSurface:drawFill()
love.graphics.setColor(self.color)
for i = 2, self.columnsLength do
local p1x = self.x + (i - 2)
local p1y = self.bottomY - self.columns[i - 1].height
local p2x = self.x + (i - 1)
local p2y = self.bottomY - self.columns[i].height
local p3x, p3y = p2x, self.bottomY
local p4x, p4y = p1x, self.bottomY
love.graphics.polygon("fill",
p1x, p1y, p3x, p3y, p2x, p2y,
p3x, p3y, p4x, p4y, p2x, p2y
)
end
end
function LiquidSurface:drawLine()
local linePoints = {}
for i = 1, self.columnsLength do
linePoints[#linePoints + 1] = self.x + (i - 1)
linePoints[#linePoints + 1] = self.bottomY - self.columns[i].height
end
love.graphics.setColor(1, 1, 1, 1)
love.graphics.setLineWidth(1)
love.graphics.setLineStyle("rough")
love.graphics.line(linePoints)
love.graphics.setLineStyle("smooth")
love.graphics.setColor(1, 1, 1, 1)
end
function LiquidSurface:draw()
self:drawFill()
self:drawLine()
end
return LiquidSurface
|
