地形を作る＠コードを学ぼう2

// 地形を作る＠コードを学ぼう2
var heights: [Int] = [7,6,9,2]
let allCoordinates = world.allPossibleCoordinates

var index = 0
for coordinate in allCoordinates {
    if index == heights.count {
        index = 0
    }
    for i in 0...heights[index] {
        // Place a block.
        world.place(Block(), at: coordinate)
    }
    // Increment the index.
    index += 1
}

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