COCOS2dx enables MAP scaling, dragging, and dragging

COCOS2dx enables MAP scaling, dragging, and dragging

The code for lua is as follows:

The scaling algorithm is similar to http://blog.csdn.net/somestill/article/details/10581277. some optimizations to this algorithm have bugs.

Cc. fileUtils: getInstance (): addSearchPath (src) cc. fileUtils: getInstance (): addSearchPath (res) require game. enginedefalocal local _ layer = nil; local _ scene = nil; local _ tileMap = nil; local _ grassTileLayer = nil; local _ treeTileLayer = nil; local _ player = nil; local distance; local deltaX; local deltaY; local mscale = 1; local firsttouch = true; -- Slide assist local lastMove = nil; local DIS_MIN = 5; local function autoMoveMap () print (autoMoveMap, lastMove. x, lastMove. y); if (math. abs (lastMove. x) <= 2 and math. abs (lastMove. y) <= 2) then local px, py = _ tileMap: getPosition (); _ tileMap: setPosition (cc. p (px + lastMove. x, py + lastMove. y); _ layer: unscheduleUpdate (); lastMove = nil; return; end local px, py = _ tileMap: getPosition (); local moveX = lastMove. x/1.2; local moveY = lastMove. y/1.2; _ tileMap: setPosition (cc. p (px + moveX, py + moveY); lastMove. x = moveX; lastMove. y = moveY; endlocal function onTouchBegin (touch, event) firsttouch = true; _ layer: unscheduleUpdate (); return true; endlocal function onTouchMove (touch, event) if (# touch = 1) then -- single touch -- reset the flag to prevent the start user from scaling with two fingers -- releasing one finger and dragging with two fingers will not trigger the onTouchBegin issue firsttouch = true; local d = touch [1]: getDelta (); local scale = _ layer: getScale (); -- The sliding distance must be determined based on the scaling ratio. Otherwise, the sliding distance will not change if the scale is small. d = cc. p (d. x/scale, d. y/scale); local px, py = _ tileMap: getPosition (); _ tileMap: setPosition (cc. p (px + d. x, py + d. y); lastMove = d; else -- multi touch lastMove = nil local p1 = touch [1]: getLocation (); local p2 = touch [2]: getLocation (); local pMid = cc. pMidpoint (p1, p2); if (firsttouch) then firsttouch = false; distance = cc. pGetDistance (p1, p2); deltaX = pMid. x-_ layer: getPositionX (); deltaY = pMid. y-_ layer: getPositionY (); return; end local mdistance = cc. pGetDistance (p1, p2); mscale = mdistance/distance * mscale; distance = mdistance; _ layer: setScale (mscale ); -- this factor is used to solve the point floating problem in this algorithm. When the scale ratio is small, the center point will be more strange. local factor = math. min (1, _ layer: getScale (); local x = (pMid. x-deltaX) * factor; local y = (pMid. y-deltaY) * factor; _ layer: setPosition (cc. p (x, y); deltaX = pMid. x-_ layer: getPositionX (); deltaY = pMid. y-_ layer: getPositionY (); end -- endlocal function onTouchEnd (touch, event) if (# touch = 1) then -- single touch if (lastMove) then -- lastMove = cc. pMul (lastMove, 5); if (math. abs (lastMove. x) <= DIS_MIN and math. abs (lastMove. y) <= DIS_MIN) then return; end _ layer: scheduleUpdate (autoMoveMap); else return; end else -- multi touch end endlocal function loadTileMap () _ tileMap = ccexp. TMXTiledMap: create (map. tmx); _ treeTileLayer = _ tileMap: getLayer (trees); _ grassTileLayer = _ tileMap: getLayer (grass); _ tileMap: setScale (2); return _ tileMap; endlocal function createLayer () _ layer = cc. layer: create (); _ layer: addChild (loadTileMap (); _ layer: setTouchEnabled (true); local listener = cc. eventListenerTouchAllAtOnce: create (); listener: registerScriptHandler (onTouchBegin, cc. handler. EVENT_TOUCHES_BEGAN); listener: registerScriptHandler (onTouchMove, cc. handler. EVENT_TOUCHES_MOVED); listener: registerScriptHandler (onTouchEnd, cc. handler. EVENT_TOUCHES_ENDED); _ layer: getEventDispatcher (): addEventListenerWithSceneGraphPriority (listener, _ layer); return _ layer; endlocal function createScene () _ scene = cc. scene: create (); _ scene: addChild (createLayer (); return _ scene; endlocal function main () cc. director: getInstance (): runWithScene (createScene (); endxpcall (main, _ g1_trackback __)