main.lua

-- Some global stuff that the examples use.
global = {}
global.limitDrawing = false     -- If true then the drawing range example is shown
global.benchmark = false        -- If true the map is drawn 20 times instead of 1
global.useBatch = false         -- If true then the layers are rendered with sprite batches
global.tx = 0                   -- X translation of the screen
global.ty = 0                   -- Y translation of the screen
global.scale = 1                -- Scale of the screen

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-- Load the examples
local example = {require("DesertExample"), require("IsoExample"),  
                 require("PerspExample"), require("SewerExample")}
                  
local num = 1                   -- The map we're currently on
local fps = 0                   -- Frames Per Second
local fpsCount = 0              -- FPS count of the current second
local fpsTime = 0               -- Keeps track of the elapsed time

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-- Reset the current example
if example[num].reset then example[num].reset() end

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-- Scroll in and out
function love.mousepressed( x, y, mb )
    if mb == "wu" then
        global.scale = global.scale + 0.1
    end

    if mb == "wd" then
        global.scale = global.scale - 0.1
    end
end

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function love.update(dt)
    -- Move the camera
    if love.keyboard.isDown("up") then global.ty = global.ty + 250*dt end
    if love.keyboard.isDown("down") then global.ty = global.ty - 250*dt end
    if love.keyboard.isDown("left") then global.tx = global.tx + 250*dt end
    if love.keyboard.isDown("right") then global.tx = global.tx - 250*dt end
    
    -- Count the frames per second
    fpsCount = fpsCount+1
    fpsTime = fpsTime + dt
    if fpsTime >= 1 then
        fps = fpsCount
        fpsTime = 0
        fpsCount = 0
    end
    
    -- Call update in our example if it is defined
    if example[num].update then example[num].update(dt) end
end

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function love.keypressed(k)
    -- quit
    if k == 'escape' then
        love.event.push("quit")
    end
    
    -- previous map
    if k == 'z' then
        num =  num <= 1 and #example or num - 1
        if example[num].reset then example[num].reset() end
    end
    
    -- next map
    if k == 'x' then
        num = num >= #example and 1 or num + 1
        if example[num].reset then example[num].reset() end
    end
    
    -- limit drawing
    if k == 'c' then
        if global.limitDrawing then global.limitDrawing = false else global.limitDrawing = true end
    end
    
    -- benchmark
    if k == 'v' then
        if global.benchmark then global.benchmark = false else global.benchmark = true end
    end
    
    -- use sprite batches
    if k == 'b' then
        if global.useBatch then global.useBatch = false else global.useBatch = true end
    end
    
    -- Call keypressed in our example if it is defined
    if example[num].keypressed then example[num].keypressed(k) end
end

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function love.draw()
    
    -- Draw our example
    example[num].draw()
    
    -- Insert display text into tables
    instructions = {"Arrow Keys - Move", "Mouse Wheel - Zoom", "Z and X - Change Map", 
                    "C - Toggle Limit Drawing", "V - Toggle Benchmark", "B - Toggle Batches",
                    "WSAD - Move Character"}
    information = {string.format("(%d,%d)", -global.tx, -global.ty), 
                    "Scale: " .. global.scale, string.format("Map %d of %d", num, #example), 
                    global.limitDrawing and "Limiting drawing" or "Drawing entire screen",
                    string.format("Drawing %d time(s). FPS: %d", global.benchmark and 20 or 1, fps), 
                    global.useBatch and "Using SpriteBatches" or "Not Using SpriteBatches"}
    
    -- Draw a box so we can see the text easier
    love.graphics.setColor(0,0,0,100)
    love.graphics.rectangle("fill",0,0,350, #instructions*20)
    love.graphics.setColor(255,255,255,255)
    
    -- print display text
    for i=1,#instructions do
        love.graphics.print(instructions[i], 0, (i-1)*20)
    end
    for i=1,#information do
        love.graphics.print(information[i], 160, (i-1)*20)
    end

end