flymis/WebRoot/dojojs/src/gfx/common.js

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/*
	Copyright (c) 2004-2006, The Dojo Foundation
	All Rights Reserved.

	Licensed under the Academic Free License version 2.1 or above OR the
	modified BSD license. For more information on Dojo licensing, see:

		http://dojotoolkit.org/community/licensing.shtml
*/

dojo.provide("dojo.gfx.common");

dojo.require("dojo.gfx.color");
dojo.require("dojo.lang.declare");
dojo.require("dojo.lang.extras");
dojo.require("dojo.dom");

dojo.lang.mixin(dojo.gfx, {
	// summary: defines constants, prototypes, and utility functions
	
	// default shapes, which is used to fill in missing parameters
	defaultPath:     {type: "path",     path: ""},
	defaultPolyline: {type: "polyline", points: []},
	defaultRect:     {type: "rect",     x: 0, y: 0, width: 100, height: 100, r: 0},
	defaultEllipse:  {type: "ellipse",  cx: 0, cy: 0, rx: 200, ry: 100},
	defaultCircle:   {type: "circle",   cx: 0, cy: 0, r: 100},
	defaultLine:     {type: "line",     x1: 0, y1: 0, x2: 100, y2: 100},
	defaultImage:    {type: "image",    width: 0, height: 0, src: ""},

	// default geometric attributes (a stroke, and fills)
	defaultStroke: {color: "black", width: 1, cap: "butt", join: 4},
	defaultLinearGradient: {type: "linear", x1: 0, y1: 0, x2: 100, y2: 100, 
		colors: [{offset: 0, color: "black"}, {offset: 1, color: "white"}]},
	defaultRadialGradient: {type: "radial", cx: 0, cy: 0, r: 100, 
		colors: [{offset: 0, color: "black"}, {offset: 1, color: "white"}]},
	defaultPattern: {type: "pattern", x: 0, y: 0, width: 0, height: 0, src: ""},

	normalizeColor: function(/* Color */ color){
		// summary: converts any legal color representation to normalized Color object
		return (color instanceof dojo.gfx.color.Color) ? color : new dojo.gfx.color.Color(color); // dojo.gfx.color.Color
	},
	normalizeParameters: function(/* Object */ existed, /* Object */ update){
		// summary: updates an existing object with properties from the "update" object
		// existed: the "target" object to be updated
		// update: the "update" object, whose properties will be used to update the existed object
		if(update){
			var empty = {};
			for(var x in existed){
				if(x in update && !(x in empty)){
					existed[x] = update[x];
				}
			}
		}
		return existed;	// Object
	},
	makeParameters: function(/* Object */ defaults, /* Object */ update){
		// summary: copies the original object, and all copied properties from the "update" object
		// defaults: the object to be cloned before updating
		// update: the object, which properties are to be cloned during updating
		if(!update) return dojo.lang.shallowCopy(defaults, true);