From e44a7e37b6c7b5961adaffc62b9042b8d442938e Mon Sep 17 00:00:00 2001
From: mensonge <mensonge@b3834d28-1941-0410-a4f8-b48e95affb8f>
Date: Thu, 13 Nov 2008 09:49:11 +0000
Subject: 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
---
 includes/js/dojox/gfx3d/scheduler.js | 126 +++++++++++++++++++++++++++++++++++
 1 file changed, 126 insertions(+)
 create mode 100644 includes/js/dojox/gfx3d/scheduler.js

(limited to 'includes/js/dojox/gfx3d/scheduler.js')

diff --git a/includes/js/dojox/gfx3d/scheduler.js b/includes/js/dojox/gfx3d/scheduler.js
new file mode 100644
index 0000000..951970c
--- /dev/null
+++ b/includes/js/dojox/gfx3d/scheduler.js
@@ -0,0 +1,126 @@
+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.
+});
+
+}
-- 
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