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| -- Abstract: MultiPuck sample project
-- Demonstrates multitouch and draggable phyics objects using "touch joints" in gameUI library
--
-- Version: 1.1
--
-- Sample code is MIT licensed, see http://developer.anscamobile.com/code/license
-- Copyright (C) 2010 ANSCA Inc. All Rights Reserved.
--
-- History
-- 1.0 9/1/10 Initial version
-- 1.1 5/13/11 Fixed bug with stuck pucks. Added "return" to dragBody()
-- Added "return true" to spawnDisk()
-- 1.2 6/28/11 Call table.remove in removeOffscreenItems to keep allDisks as an array
-------------------------------------------------------------------------------------
display.setStatusBar( display.HiddenStatusBar )
local physics = require("physics")
local gameUI = require("gameUI")
local easingx = require("easingx")
physics.start()
physics.setGravity( 0, 0 ) -- no gravity in any direction
popSound = audio.loadSound ("pop2_wav.wav")
labelFont = gameUI.newFontXP{ ios="Zapfino", android=native.systemFont }
system.activate( "multitouch" )
local bkg = display.newImage( "paper_bkg.png", true )
bkg.x = display.contentWidth/2
bkg.y = display.contentHeight/2
local myLabel = display.newText( "Touch screen to create pucks", 0, 0, labelFont, 34 )
myLabel:setTextColor( 255, 255, 255, 180 )
myLabel.x = display.contentWidth/2
myLabel.y = 200
local diskGfx = { "puck_yellow.png", "puck_green.png", "puck_red.png" }
local allDisks = {} -- empty table for storing objects
-- Automatic culling of offscreen objects
local function removeOffscreenItems()
for i = 1, #allDisks do
local oneDisk = allDisks[i]
if (oneDisk and oneDisk.x) then
if oneDisk.x < -100 or oneDisk.x > display.contentWidth + 100 or oneDisk.y < -100 or oneDisk.y > display.contentHeight + 100 then
oneDisk:removeSelf()
table.remove( allDisks, i )
end
end
end
end
local function dragBody( event )
return gameUI.dragBody( event )
-- Substitute one of these lines for the line above to see what happens!
--gameUI.dragBody( event, { maxForce=400, frequency=5, dampingRatio=0.2 } ) -- slow, elastic dragging
--gameUI.dragBody( event, { maxForce=20000, frequency=1000, dampingRatio=1.0, center=true } ) -- very tight dragging, snaps to object center
end
local function spawnDisk( event )
local phase = event.phase
if "ended" == phase then
audio.play( popSound )
myLabel.isVisible = false
randImage = diskGfx[ math.random( 1, 3 ) ]
allDisks[#allDisks + 1] = display.newImage( randImage )
local disk = allDisks[#allDisks]
disk.x = event.x; disk.y = event.y
disk.rotation = math.random( 1, 360 )
disk.xScale = 0.8; disk.yScale = 0.8
transition.to(disk, { time = 500, xScale = 1.0, yScale = 1.0, transition = easingx.easeOutElastic }) -- "pop" animation
physics.addBody( disk, { density=0.3, friction=0.6, radius=66.0 } )
disk.linearDamping = 0.4
disk.angularDamping = 0.6
disk:addEventListener( "touch", dragBody ) -- make object draggable
end
return true
end
bkg:addEventListener( "touch", spawnDisk ) -- touch the screen to create disks
Runtime:addEventListener( "enterFrame", removeOffscreenItems ) -- clean up offscreen disks |
views:1299 update：2011/10/29 17:13:10