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authormensonge <mensonge@b3834d28-1941-0410-a4f8-b48e95affb8f>2008-11-13 09:49:11 +0000
committermensonge <mensonge@b3834d28-1941-0410-a4f8-b48e95affb8f>2008-11-13 09:49:11 +0000
commite44a7e37b6c7b5961adaffc62b9042b8d442938e (patch)
tree95b67c356e93163467db2451f2b8cce84ed5d582 /includes/js/dojox/gfx3d/scheduler.js
parenta62b9742ee5e28bcec6872d88f50f25b820914f6 (diff)
downloadsemanticscuttle-e44a7e37b6c7b5961adaffc62b9042b8d442938e.tar.gz
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New feature: basic Ajax suggestion for tags and implementation of Dojo toolkit
git-svn-id: https://semanticscuttle.svn.sourceforge.net/svnroot/semanticscuttle/trunk@151 b3834d28-1941-0410-a4f8-b48e95affb8f
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+if(!dojo._hasResource["dojox.gfx3d.scheduler"]){ //_hasResource checks added by build. Do not use _hasResource directly in your code.
+dojo._hasResource["dojox.gfx3d.scheduler"] = true;
+dojo.provide("dojox.gfx3d.scheduler");
+dojo.provide("dojox.gfx3d.drawer");
+dojo.require("dojox.gfx3d.vector");
+
+dojo.mixin(dojox.gfx3d.scheduler, {
+ zOrder: function(buffer, order){
+ order = order ? order : dojox.gfx3d.scheduler.order;
+ buffer.sort(function(a, b){
+ return order(b) - order(a);
+ });
+ return buffer;
+ },
+
+ bsp: function(buffer, outline){
+ console.debug("BSP scheduler");
+ outline = outline ? outline : dojox.gfx3d.scheduler.outline;
+ var p = new dojox.gfx3d.scheduler.BinarySearchTree(buffer[0], outline);
+ dojo.forEach(buffer.slice(1), function(item){ p.add(item, outline); });
+ return p.iterate(outline);
+ },
+
+ // default implementation
+ order: function(it){
+ return it.getZOrder();
+ },
+
+ outline: function(it){
+ return it.getOutline();
+ }
+
+});
+
+dojo.declare("dojox.gfx3d.scheduler.BinarySearchTree", null, {
+ constructor: function(obj, outline){
+ // summary: build the binary search tree, using binary space partition algorithm.
+ // The idea is for any polygon, for example, (a, b, c), the space is divided by
+ // the plane into two space: plus and minus.
+ //
+ // for any arbitary vertex p, if(p - a) dotProduct n = 0, p is inside the plane,
+ // > 0, p is in the plus space, vice versa for minus space.
+ // n is the normal vector that is perpendicular the plate, defined as:
+ // n = ( b - a) crossProduct ( c - a )
+ //
+ // in this implementation, n is declared as normal, ,a is declared as orient.
+ //
+ // obj: object: dojox.gfx3d.Object
+ this.plus = null;
+ this.minus = null;
+ this.object = obj;
+
+ var o = outline(obj);
+ this.orient = o[0];
+ this.normal = dojox.gfx3d.vector.normalize(o);
+ },
+
+ add: function(obj, outline){
+ var epsilon = 0.5, o = outline(obj), v = dojox.gfx3d.vector, n = this.normal, a = this.orient;
+
+ if(dojo.every(o, function(item){ return Math.floor(epsilon + v.dotProduct(n, v.substract(item, a))) <= 0; })){
+ if(this.minus){
+ this.minus.add(obj, outline);
+ } else {
+ this.minus = new dojox.gfx3d.scheduler.BinarySearchTree(obj, outline);
+ }
+ } else if(dojo.every(o, function(item){ return Math.floor(epsilon + v.dotProduct(n, v.substract(item, a))) >= 0; })){
+ if(this.plus){
+ this.plus.add(obj, outline);
+ } else {
+ this.plus = new dojox.gfx3d.scheduler.BinarySearchTree(obj, outline);
+ }
+ } else {
+ dojo.forEach(o, function(item){ console.debug(v.dotProduct(n, v.substract(item, a))); });
+ throw "The case: polygon cross siblings' plate is not implemneted yet";
+ }
+ },
+
+ iterate: function(outline){
+ var epsilon = 0.5;
+ var v = dojox.gfx3d.vector;
+ var sorted = [];
+ var subs = null;
+ // FIXME: using Infinity here?
+ var view = {x: 0, y: 0, z: -10000};
+ if(Math.floor( epsilon + v.dotProduct(this.normal, v.substract(view, this.orient))) <= 0){
+ subs = [this.plus, this.minus];
+ } else {
+ subs = [this.minus, this.plus];
+ }
+
+ if(subs[0]){
+ sorted = sorted.concat(subs[0].iterate());
+ }
+ sorted.push(this.object);
+ if(subs[1]){
+ sorted = sorted.concat(subs[1].iterate());
+ }
+ return sorted;
+ }
+
+});
+
+dojo.mixin(dojox.gfx3d.drawer, {
+ conservative: function(todos, objects, viewport){
+ console.debug('conservative draw');
+ dojo.forEach(this.objects, function(item){
+ item.destroy();
+ });
+ dojo.forEach(objects, function(item){
+ item.draw(viewport.lighting);
+ });
+ },
+ chart: function(todos, objects, viewport){
+ // NOTE: ondemand may require the todos' objects to use setShape
+ // to redraw themselves to maintain the z-order.
+ console.debug('chart draw');
+ dojo.forEach(this.todos, function(item){
+ item.draw(viewport.lighting);
+ });
+ }
+ // More aggrasive optimization may re-order the DOM nodes using the order
+ // of objects, and only elements of todos call setShape.
+});
+
+}