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--
-- main.lua
--
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-- Your code here
--water
local water = display.newImageRect("pic7-2/water.png",320, 480);
water.x = display.contentCenterX
water.y = display.contentCenterY
--透明度參數（alpha）
water.alpha = 0.8

--box
local box = display.newImageRect("pic7-2/box.png",60, 60);
box.x = display.contentWidth/2
box.y = 0

--ground
local ground = display.newImageRect("pic7-2/ground.png",700, 60);
ground.x = 0
ground.y = display.contentHeight-30

--add physics
local physics = require("physics");
physics.start()
physics.addBody( ground, "static" )
physics.addBody( box, "dynamic", { density=3, bounce=0.3 } )