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local GRID_WIDTH = 8 |
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local GRID_HEIGHT = 8 |
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local CELL_WIDTH = 40 |
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local CELL_HEIGHT = 40 |
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-- |
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-- Create a 2D array to hold our objects. |
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local grid = {} |
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for i = 1, GRID_HEIGHT do |
|
grid[i] = {} |
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end |
|
|
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-- |
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-- load the background image: |
|
|
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local checkerBoard = display.newImageRect("table.png", 320, 320) |
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checkerBoard.x = display.contentCenterX |
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checkerBoard.y = display.contentCenterY |
|
|
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-- |
|
-- Calculate some values |
|
-- |
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local gbOffsetX = checkerBoard.x - ( checkerBoard.width * checkerBoard.anchorX ) |
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local gbOffsetY = checkerBoard.y - ( checkerBoard.height * checkerBoard.anchorY ) |
|
|
|
-- |
|
-- Using positions 1, 8 for X and Y, draw the object at the right place in the grid |
|
-- |
|
|
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local function spawnPiece( xPos, yPos, pieceType ) |
|
if pieceType ~= "red" and pieceType ~= "white" then |
|
print( "Invalid piece type", pieceType ) |
|
return nil |
|
end |
|
if xPos < 1 or xPos > GRID_WIDTH or yPos < 1 or yPos > GRID_HEIGHT then |
|
print( "Position out of range:", xPos, yPos ) |
|
return nil |
|
end |
|
|
|
local piece = display.newImageRect( "token_" .. pieceType .. ".png", CELL_WIDTH, CELL_HEIGHT ) |
|
-- |
|
-- record the pieces logical position on the board |
|
-- |
|
piece.xPos = xPos |
|
piece.yPos = yPos |
|
-- |
|
-- Position the piece |
|
-- |
|
piece.x = (xPos - 1) * CELL_WIDTH + (CELL_WIDTH * 0.5) + gbOffsetX |
|
piece.y = (yPos - 1) * CELL_HEIGHT + (CELL_HEIGHT * 0.5) + gbOffsetY |
|
|
|
return piece |
|
end |
|
|
|
local function movePiece(piece, xPos, yPos ) |
|
-- check to see if the position is occupied. You can do either: |
|
-- 1. "Capture the piece". This would involve removeing the piece |
|
-- that is there before moving to the spot or |
|
-- 2. "Reject the move" because the spot is occupied. For the purpose |
|
-- of this tutorial we will reject the move. |
|
-- |
|
if xPos < 1 or xPos > GRID_WIDTH or yPos < 1 or yPos > GRID_HEIGHT then |
|
return false |
|
end |
|
if grid[yPos][xPos] == nil then -- got an empty spot |
|
-- |
|
-- get the screen x, y for where we are moving to |
|
-- |
|
local x = (xPos - 1) * CELL_WIDTH + (CELL_WIDTH * 0.5) + gbOffsetX |
|
local y = (yPos - 1) * CELL_HEIGHT + (CELL_HEIGHT * 0.5) + gbOffsetY |
|
-- |
|
-- save the old grid x, y |
|
-- |
|
local oldXPos = piece.xPos |
|
local oldYPos = piece.yPos |
|
-- |
|
-- Move the object in the table |
|
-- |
|
grid[yPos][xPos] = piece |
|
grid[yPos][xPos].xPos = xPos |
|
grid[yPos][xPos].yPos = yPos |
|
grid[oldYPos][oldXPos] = nil |
|
-- |
|
-- Now move the physical graphic |
|
-- |
|
transition.to(grid[yPos][xPos], { time = 500, x = x, y = y}) |
|
return true |
|
end |
|
end |
|
|
|
-- |
|
-- Generate a few objects |
|
-- |
|
-- |
|
-- a holding piece for moving the object |
|
-- |
|
local lastObject |
|
|
|
for i = 1, 10 do |
|
local xPos = math.random( 1, GRID_WIDTH ) |
|
local yPos = math.random( 1, GRID_HEIGHT ) |
|
local color = "red" |
|
if math.random(2) == 2 then |
|
color = "white" |
|
end |
|
grid[yPos][xPos] = spawnPiece(xPos, yPos, color, checkerBoard) |
|
lastObject = grid[yPos][xPos] |
|
end |
|
|
|
timer.performWithDelay(2000, function() movePiece( lastObject, 4, 5); end, 1) |
J. A. Whye
发布于 4 月 9 日 02:53前段时间，我创建了一个实用程序，帮助我解决了一个基于网格的问题。给定任何大小的网格中的任何位置，我想知道它周围有哪些网格方块（左、右、上、下和对角线）。
我最终得到了你在这里看到的代码
http://masteringcoronasdk.com/free-corona-sdk-tutorial/wont-you-be-my-grid-neighbor/
可能有一些基于数学的巧妙方法可以使解决方案成为一行代码，但在有人发布之前，如果它有助于解决你的问题，请随意使用该代码。
Jay