AoE4 Generated Map Function: Circle Fill

circleFill.lua

--draws a circle that is filled
--copy and paste code to preview at https://aoe4.app/
local function circleFill(centerCoord, tileCoord, radius)
    dx = centerCoord.row - tileCoord.row
    dy = centerCoord.col - tileCoord.col
    distanceSquared = (dx*dx) + (dy*dy)
    return distanceSquared <= radius*radius
end

centerCoord = { row = mapHalfSize, col = mapHalfSize }
radius = 5.25

for row = 1, gridSize do
    for col = 1, gridSize do
        tileCoord = { row = row, col = col }
        if (circleFill(centerCoord, tileCoord, radius)) then
             terrainLayoutResult[row][col].terrainType = tt_lake_shallow
        end
    end
end