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cellulo-lovr/lib/grid.lua
fbe15d5301a9celluloVR

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grid.lua
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local grid = {}
grid.__index = grid
local epsilon = 1 / 1e6
local function round(x, n)
n = n or 1
return x >= 0 and math.floor(x / n + .5) * n or math.ceil(x / n - .5) * n
end
function grid.new(width, depth, size, pattern, fill)
local self = setmetatable({}, grid)
self.width = width or 10
self.depth = depth or 10
self.size = size or 1
self.pattern = pattern or { 1 }
self.fill = fill or nil
local vertexFormat = {
{ 'lovrPosition', 'float', 3 },
{ 'lovrVertexColor', 'byte', 4 }
}
local vertices = {}
local w, d, s = round(self.width / 2, self.size), round(self.depth / 2, self.size), self.size
for x = -w, w + epsilon, s do
local i = 1 + round(x / s) % #self.pattern
table.insert(vertices, { x, 0, -d, 255, 255, 255, 255 * self.pattern[i] })
table.insert(vertices, { x, 0, d, 255, 255, 255, 255 * self.pattern[i] })
end
for z = -d, d + epsilon, s do
local i = 1 + round(z / s) % #self.pattern
table.insert(vertices, { -w, 0, z, 255, 255, 255, 255 * self.pattern[i] })
table.insert(vertices, { w, 0, z, 255, 255, 255, 255 * self.pattern[i] })
end
self.mesh = lovr.graphics.newMesh(vertexFormat, vertices, 'lines', 'static')
return self
end
function grid:draw(...)
local w, d, s = round(self.width / 2, self.size), round(self.depth / 2, self.size), self.size
lovr.graphics.push()
lovr.graphics.transform(...)
if self.fill then
local r, g, b, a = lovr.graphics.getColor()
lovr.graphics.setColor(self.fill)
lovr.graphics.push()
lovr.graphics.scale(w * 2, d * 2)
lovr.graphics.plane('fill', 0, -epsilon, 0, 1, math.pi / 2, 1, 0, 0)
lovr.graphics.pop()
lovr.graphics.setColor(r, g, b, a)
end
self.mesh:draw()
lovr.graphics.pop()
end
return grid
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