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//>>built
// wrapped by build app
define("dojox/drawing/util/positioning", ["dijit","dojo","dojox"], function(dijit,dojo,dojox){
dojo.provide("dojox.drawing.util.positioning");
(function(){
var textOffset = 4; // distance from line to text box
var textYOffset = 20; // height of text box
dojox.drawing.util.positioning.label = function(/*Object*/start, /*Object*/end){
// summary:
// Returns the optimal text positions for annotations.Label.
// label at middle of vector
var x = 0.5*(start.x+end.x);
var y = 0.5*(start.y+end.y);
// move label a set distance from the line
var slope = dojox.drawing.util.common.slope(start, end);
var deltay = textOffset/Math.sqrt(1.0+slope*slope);
if(end.y>start.y && end.x>start.x || end.y<start.y && end.x<start.x){
// Position depending on quadrant. Y offset
// positions box aligned vertically from top
deltay = -deltay;
y -= textYOffset;
}
x += -deltay*slope;
y += deltay;
// want text to be away from start of vector
// This will make force diagrams less crowded
var align = end.x<start.x ? "end" : "start";
return { x:x, y:y, foo:"bar", align:align}; // Object
};
dojox.drawing.util.positioning.angle = function(/*Object*/start, /*Object*/end){
// summary:
// Returns the optimal position for annotations.Angle.
//
// angle at first third of vector
var x = 0.7*start.x+0.3*end.x;
var y = 0.7*start.y+0.3*end.y;
// move label a set distance from the line
var slope = dojox.drawing.util.common.slope(start, end);
var deltay = textOffset/Math.sqrt(1.0+slope*slope);
if(end.x<start.x){deltay = -deltay;}
x += -deltay * slope;
y += deltay;
// want text to be clockwise from vector
// to match angle measurement from x-axis
var align = end.y>start.y ? "end" : "start";
// box vertical aligned from middle
y += end.x > start.x ? 0.5*textYOffset : -0.5*textYOffset;
return { x:x, y:y, align:align}; // Object
}
})();
});
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