Graph Nodes

-- Define the graph tree as a table of nodes and edges
local graph = {
    nodes = {
        { x = 10, y = 10 },
        { x = 30, y = 10 },
        { x = 20, y = 30 },
        { x = 10, y = 50 },
        { x = 30, y = 50 },
        { x = 20, y = 70 },
        { x = 5, y = 90 },
        { x = 35, y = 90 },
    },
    edges = {
        { 1, 2 },
        { 1, 3 },
        { 2, 3 },
        { 3, 4 },
        { 3, 5 },
        { 4, 6 },
        { 5, 6 },
        { 4, 7 },
        { 5, 8 },
    },
}

local letters = {"ABCDEFGHIJKLMNOPQRSTUVWXYZ", "abcdefghijklmnopqrstuvwxyz"}

-- Define a function to draw a node at a given position
local function drawNode(x, y, name)
    paintutils.drawFilledBox(x - 2, y - 1, x + 2, y + 1, colors.green)
    paintutils.drawPixel(x - 2, y - 1, colors.white)
    paintutils.drawPixel(x + 2, y - 1, colors.white)
    paintutils.drawPixel(x - 2, y + 1, colors.white)
    paintutils.drawPixel(x + 2, y + 1, colors.white)
    term.setCursorPos(x - 1, y)
    term.write(name)
end

-- Define a function to draw an edge between two nodes
local function drawEdge(x1, y1, x2, y2, name)
    paintutils.drawLine(x1, y1, x2, y2, colors.white)
    local x = math.floor((x1 + x2) / 2)
    local y = math.floor((y1 + y2) / 2)
    term.setCursorPos(x, y)
    term.write(name)
end

-- Draw the graph tree
local monitor = peripheral.wrap("top")
term.redirect(monitor)
monitor.setBackgroundColor(colors.black)
monitor.setTextScale(0.5)
monitor.clear()
for i, edge in ipairs(graph.edges) do
    local node1 = graph.nodes[edge[1]]
    local node2 = graph.nodes[edge[2]]
    local edgeName = letters[2][i]
    drawEdge(node1.x, node1.y, node2.x, node2.y, edgeName)
end
for i, node in ipairs(graph.nodes) do
    local nodeName = letters[1][i]
    drawNode(node.x, node.y, nodeName)
end