82 lines
2.6 KiB
Lua
82 lines
2.6 KiB
Lua
local camera = {0, 0}
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local screen = {800,600}
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local squares = nil
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local squaresize = 50
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local maxx, maxy = 100, 100
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--love.window.setMode( 1024, 768 )
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function love.load()
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-- build the map
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squares = {}
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for y = 1, maxy do
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local row = {}
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for x = 1, maxx do
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local sq = {set = false}
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table.insert(row, sq)
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end
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table.insert(squares, row)
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end
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screen[1] = love.graphics.getWidth()
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screen[2] = love.graphics.getHeight()
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end
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function love.draw()
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-- draw the currently visible portion of the map
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-- this draws every partially visible square and relies
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-- on love drawing code to clip the edges
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local camx, camy = unpack(camera)
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local scrx, scry = unpack(screen)
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--Prevent camera from going off screen
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local vleft = math.floor(camx/squaresize)
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local vup = math.floor(camy/squaresize)
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local horc = math.ceil(scrx/squaresize) + 1
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local verc = math.ceil(scry/squaresize) + 1
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-- Until the number of vertical squares
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for y = 1, verc do
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-- Until the number of horizontal squares
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for x = 1, horc do
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if squares[vup+y] and squares[vup+y][vleft+x] then
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local mode = "line"
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if squares[vup+y][vleft+x].set then
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mode = "fill"
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end
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love.graphics.rectangle(mode, (vleft+x-1)*squaresize - camx,
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(vup+y-1)*squaresize - camy, squaresize, squaresize)
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end
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end
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end
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end
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local scrollspeed = 200
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local edge = 100
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function love.update(dt)
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-- scroll the screen if mouse is near edges
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local scrx, scry = unpack(screen)
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local mx, my = love.mouse.getPosition()
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if mx < edge/2 then camera[1] = camera[1] - scrollspeed * dt end
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if mx > scrx - edge/2 then camera[1] = camera[1] + scrollspeed * dt end
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if my < edge/2 then camera[2] = camera[2] - scrollspeed * dt end
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if my > scry - edge/2 then camera[2] = camera[2] + scrollspeed * dt end
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-- limit the camera position from wandering off
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if camera[1] < -edge then camera[1] = -edge end
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if camera[2] < -edge then camera[2] = -edge end
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local xlimit, ylimit = maxx*squaresize + edge - scrx, maxy*squaresize + edge - scry
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if camera[1] > xlimit then camera[1] = xlimit end
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if camera[2] > ylimit then camera[2] = ylimit end
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end
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function love.mousepressed(x, y, button)
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-- toggle the clicked square on left button click
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if button ~= 'l' then return end
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local wx, wy = x + camera[1], y + camera[2]
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local x, y = math.floor(wx/squaresize)+1, math.floor(wy/squaresize)+1
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if squares[y] and squares[y][x] then
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local value = squares[y][x].set
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squares[y][x].set = not value -- toggle bool flag
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end
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end
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