{"id":406,"date":"2009-09-14T12:29:42","date_gmt":"2009-09-14T19:29:42","guid":{"rendered":"https:\/\/actionsnippet.com\/?p=2179"},"modified":"2009-09-14T12:29:42","modified_gmt":"2009-09-14T19:29:42","slug":"quickbox2d-contacts-part-1","status":"publish","type":"post","link":"https:\/\/actionsnippet.com\/?p=406","title":{"rendered":"QuickBox2D Contacts Part 1"},"content":{"rendered":"
\r\nimport com.actionsnippet.qbox.*;\r\nimport Box2D.Common.Math.*;\r\n\r\n[SWF(width = 800, height = 600, backgroundColor = 0x000000, frameRate=60)]\r\n\r\nvar sim:QuickBox2D = new QuickBox2D(this, {debug:false, frim:true});\r\n\r\nsim.createStageWalls();\r\n\r\nvar boxA:QuickObject = sim.addBox({x:3, y:3, width:2, height:2, fillColor:0xFF0000});\r\nvar boxB:QuickObject = sim.addBox({x:3, y:6, width:2, height:2, fillColor:0xFF0000});\r\n\r\nsim.start();\r\nsim.mouseDrag();\r\n\r\n\/\/ when boxA touches boxB a circle QuickObject is created\r\nvar contacts:QuickContacts = sim.addContactListener();\r\n\/\/ listen for contact points being added\r\ncontacts.addEventListener(QuickContacts.ADD, onAdd);\r\nfunction onAdd(evt:Event):void{\r\n\t\/\/ see if this contact event is associated with boxA and boxB\r\n\tif(contacts.isCurrentContact(boxA, boxB)){\r\n\t\t\/\/ get the location of the collision in world space\r\n\t\tvar loc:b2Vec2 = contacts.currentPoint.position;\r\n\t\t\/\/ you cannot create new QuickObjects inside this listener function\r\n\t\t\/\/ so we just give a 5 ms delay\r\n\t\tsetTimeout(sim.addCircle, 5, {x:loc.x, y:loc.y});\r\n\t}\r\n}\r\n<\/pre>\n
Note: This snippet requires QuickBox2D 1.0 or greater<\/a><\/i><\/p>\n
I’ve created a few simple examples to show how to use QuickBox2D contact listeners. This is the first one. When two boxes collide circles are added to the simulation at the point of collision.<\/p>\n

\nHave a look at the swf…<\/p>\n
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