{"id":381,"date":"2009-08-16T12:19:11","date_gmt":"2009-08-16T19:19:11","guid":{"rendered":"https:\/\/actionsnippet.com\/?p=2010"},"modified":"2009-08-16T12:19:11","modified_gmt":"2009-08-16T19:19:11","slug":"quickbox2d-floating-walker","status":"publish","type":"post","link":"https:\/\/actionsnippet.com\/?p=381","title":{"rendered":"QuickBox2D Floating Walker"},"content":{"rendered":"<pre class=\"brush: as3; title: ; notranslate\" title=\"\">\r\nimport com.actionsnippet.qbox.*;\r\nimport Box2D.Common.Math.*;\r\nimport Box2D.Dynamics.Joints.*;\r\n\r\n&#x5B;SWF (backgroundColor=0x000000, width=700, height=600, frameRate=60)]\r\n\r\nvar sim:QuickBox2D = new QuickBox2D(this, {gravityY:.2});\r\n\r\nsim.setDefault({fillColor:0xEFEFEF, fillAlpha:0.5, lineColor:0xFFFFFF});\r\n\r\nsim.createStageWalls();\r\n\r\nfor (var i:int = 0; i&lt;20; i++){\r\n\tsim.addCircle({x:1+i, y:1, radius:0.2, restitution:1});\r\n}\r\n\r\nvar head:QuickObject = sim.addCircle({x:0, y:0, radius:0.5});\r\nvar neck:QuickObject = sim.addBox({x:0, y:1, width:0.5, height:2});\r\nvar top:QuickObject = sim.addGroup({objects:&#x5B;head, neck], x:10, y:5, fixedRotation:true});\r\n\r\nvar upperLegA:QuickObject = sim.addBox({x:10, y:7.5, width:0.25, height:1.5,groupIndex:-2});\r\nvar lowerLegA:QuickObject = sim.addBox({x:10, y:9, width:0.25, height:1.5,groupIndex:-2});\r\n\r\nvar upperLegB:QuickObject = sim.addBox({x:10, y:7.5, width:0.25, height:1.5,groupIndex:-2});\r\nvar lowerLegB:QuickObject = sim.addBox({x:10, y:9, width:0.25, height:1.5,groupIndex:-2});\r\n\r\nvar anchor:b2Vec2 = new b2Vec2();\r\nfunction connect(a:QuickObject, b:QuickObject, lower:Number, upper:Number, offX:Number=0, offY:Number = 0):QuickObject{\r\n\t var min:Number = Math.min(a.y, b.y);\r\n     var max:Number = Math.max(a.y, b.y);\r\n     anchor.y = min + (max - min) * 0.5 + offY;\r\n     min = Math.min(a.x, b.x);\r\n     max = Math.max(a.x, b.x);\r\n     anchor.x = min + (max - min) * 0.5 + offX;\r\n\t return sim.addJoint({a:a.body, b:b.body, x1:anchor.x, y1:anchor.y, lowerAngle:lower, upperAngle:upper});\r\n}\r\n\r\nsim.setDefault({type:&quot;revolute&quot;, collideConnected:false, enableLimit:true, enableMotor:true, maxMotorTorque:250, lineColor:0xFFFFFF});\r\n\r\nvar upperLegAJoint:QuickObject = connect(top, upperLegA, -1, 1, 0, 0.8);\r\nvar upperLegBJoint:QuickObject = connect(top, upperLegB, -1, 1, 0, 0.8);\r\n\r\nvar lowerLegAJoint:QuickObject = connect(upperLegA, lowerLegA, -1, 1);\r\nvar lowerLegBJoint:QuickObject = connect(upperLegB, lowerLegB, -1, 1);\r\n\r\nsim.start();\r\nsim.mouseDrag();\r\n \r\n\r\nvar j:b2RevoluteJoint;\r\nvar t:Number = -Math.PI * 0.5;\r\naddEventListener(Event.ENTER_FRAME, onLoop);\r\nfunction onLoop(evt:Event):void {\r\n\t\r\n\tvar s1:Number = 1*Math.sin(t);\r\n\tvar s2:Number = 1*Math.sin(t+Math.PI);\r\n\tt+= 0.05;\r\n\t\r\n\ttop.body.SetAngularVelocity(s1 * 0.25);\r\n\t\r\n\tj =  upperLegAJoint.joint as b2RevoluteJoint;\r\n    j.SetMotorSpeed(s1);\r\n\t\r\n\tj =  upperLegBJoint.joint as b2RevoluteJoint;\r\n    j.SetMotorSpeed(s2);\r\n\t \r\n\tj = lowerLegAJoint.joint as b2RevoluteJoint;\r\n\tj.SetMotorSpeed(-s2);\r\n\t\r\n\tj = lowerLegBJoint.joint as b2RevoluteJoint;\r\n\tj.SetMotorSpeed(-s1);\r\n}\r\n<\/pre>\n<p>Experimenting with primitive robot designs&#8230; this was just an improvised design &#8211; it looks like it may make sense to break out a pencil and some paper &#8211; or my wacom&#8230; to get something interesting&#8230;<\/p>\n<p><a data-asruffle-linked=\"true\" href=\"http:\/\/www.actionsnippet.com\/swfs\/floating_walker.html\" target=\"blank\"><br \/>\nHave a look at the swf&#8230;<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/actionsnippet.com\/wp-content\/float_walker.gif\" \/><br \/>\n<\/a> <span class=\"asruffle-link\" data-swf=\"{&quot;url&quot;:&quot;https:\\\/\\\/actionsnippet.com\\\/swfs\\\/floating_walker.swf&quot;,&quot;title&quot;:&quot;floating walker&quot;,&quot;width&quot;:700,&quot;height&quot;:600,&quot;missing&quot;:false,&quot;allowScriptAccess&quot;:false,&quot;backgroundColor&quot;:&quot;#000000&quot;}\"><button type=\"button\" hidden aria-expanded=\"false\">Play demo<span class=\"screen-reader-text\">: floating walker<\/span><\/button><\/span><\/p>\n","protected":false},"excerpt":{"rendered":"<p>import com.actionsnippet.qbox.*; import Box2D.Common.Math.*; import Box2D.Dynamics.Joints.*; &#x5B;SWF (backgroundColor=0x000000, width=700, height=600, frameRate=60)] var sim:QuickBox2D = new QuickBox2D(this, {gravityY:.2}); sim.setDefault({fillColor:0xEFEFEF, fillAlpha:0.5, lineColor:0xFFFFFF}); sim.createStageWalls(); for (var i:int = 0; i&lt;20; i++){ sim.addCircle({x:1+i, y:1, radius:0.2, restitution:1}); } var head:QuickObject = sim.addCircle({x:0, y:0, radius:0.5}); var neck:QuickObject = sim.addBox({x:0, y:1, width:0.5, height:2}); var top:QuickObject = sim.addGroup({objects:&#x5B;head, neck], x:10, y:5, fixedRotation:true}); var [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[11,13,12],"tags":[3,14,15,4,16],"class_list":["post-381","post","type-post","status-publish","format-standard","hentry","category-box2d","category-motion","category-quickbox2d","tag-actionscript","tag-as3","tag-box2d","tag-flash","tag-quickbox2d"],"_links":{"self":[{"href":"https:\/\/actionsnippet.com\/index.php?rest_route=\/wp\/v2\/posts\/381","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/actionsnippet.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/actionsnippet.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/actionsnippet.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/actionsnippet.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=381"}],"version-history":[{"count":0,"href":"https:\/\/actionsnippet.com\/index.php?rest_route=\/wp\/v2\/posts\/381\/revisions"}],"wp:attachment":[{"href":"https:\/\/actionsnippet.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=381"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/actionsnippet.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=381"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/actionsnippet.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=381"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}