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//>>built
define("dojox/gfx/gradient", ["dojo/_base/lang", "./matrix", "dojo/_base/Color"],
function(lang, m, Color){
// Various utilities to deal with a linear gradient (mostly VML-specific)
var grad = lang.getObject("dojox.gfx.gradient", true);
var C = Color;
/*===== grad = dojox.gfx.gradient; =====*/
grad.rescale = function(stops, from, to){
// summary:
// Recalculates a gradient from 0-1 window to
// "from"-"to" window blending and replicating colors,
// if necessary.
// stops: Array
// input gradient as a list of colors with offsets
// (see dojox.gfx.defaultLinearGradient and dojox.gfx.defaultRadialGradient)
// from: Number
// the beginning of the window, should be less than "to"
// to: Number
// the end of the window, should be more than "from"
var len = stops.length, reverseFlag = (to < from), newStops;
// do we need to reverse the color table?
if(reverseFlag){
var tmp = from;
from = to;
to = tmp;
}
// various edge cases
if(!len){
// no colors
return [];
}
if(to <= stops[0].offset){
// all colors are before the color table
newStops = [
{offset: 0, color: stops[0].color},
{offset: 1, color: stops[0].color}
];
}else if(from >= stops[len - 1].offset){
// all colors are after the color table
newStops = [
{offset: 0, color: stops[len - 1].color},
{offset: 1, color: stops[len - 1].color}
];
}else{
// main scanning algorithm
var span = to - from, stop, prev, i;
newStops = [];
if(from < 0){
newStops.push({offset: 0, color: new C(stops[0].color)});
}
for(i = 0; i < len; ++i){
stop = stops[i];
if(stop.offset >= from){
break;
}
// skip this color
}
if(i){
prev = stops[i - 1];
newStops.push({
offset: 0,
color: Color.blendColors(new C(prev.color), new C(stop.color), (from - prev.offset) / (stop.offset - prev.offset))
});
}else{
newStops.push({offset: 0, color: new C(stop.color)});
}
for(; i < len; ++i){
stop = stops[i];
if(stop.offset >= to){
break;
}
newStops.push({offset: (stop.offset - from) / span, color: new C(stop.color)});
}
if(i < len){
prev = stops[i - 1];
newStops.push({
offset: 1,
color: Color.blendColors(new C(prev.color), new C(stop.color), (to - prev.offset) / (stop.offset - prev.offset))
});
}else{
newStops.push({offset: 1, color: new C(stops[len - 1].color)});
}
}
// reverse the color table, if needed
if(reverseFlag){
newStops.reverse();
for(i = 0, len = newStops.length; i < len; ++i){
stop = newStops[i];
stop.offset = 1 - stop.offset;
}
}
return newStops;
};
function getPoint(x, y, matrix, project, shiftAndRotate, scale){
var r = m.multiplyPoint(matrix, x, y),
p = m.multiplyPoint(project, r);
return {r: r, p: p, o: m.multiplyPoint(shiftAndRotate, p).x / scale};
}
function sortPoints(a, b){
return a.o - b.o;
}
grad.project = function(matrix, gradient, tl, rb, ttl, trb){
// summary:
// Returns a new gradient using the "VML algorithm" and suitable for VML.
// matrix: dojox.gfx.Matrix2D|Null:
// matrix to apply to a shape and its gradient
// gradient: Object:
// a linear gradient object to be transformed
// tl: dojox.gfx.Point:
// top-left corner of shape's bounding box
// rb: dojox.gfx.Point:
// right-bottom corner of shape's bounding box
// ttl: dojox.gfx.Point:
// top-left corner of shape's transformed bounding box
// trb: dojox.gfx.Point:
// right-bottom corner of shape's transformed bounding box
matrix = matrix || m.identity;
var f1 = m.multiplyPoint(matrix, gradient.x1, gradient.y1),
f2 = m.multiplyPoint(matrix, gradient.x2, gradient.y2),
angle = Math.atan2(f2.y - f1.y, f2.x - f1.x),
project = m.project(f2.x - f1.x, f2.y - f1.y),
pf1 = m.multiplyPoint(project, f1),
pf2 = m.multiplyPoint(project, f2),
shiftAndRotate = new m.Matrix2D([m.rotate(-angle), {dx: -pf1.x, dy: -pf1.y}]),
scale = m.multiplyPoint(shiftAndRotate, pf2).x,
//comboMatrix = new m.Matrix2D([shiftAndRotate, project, matrix]),
// bbox-specific calculations
points = [
getPoint(tl.x, tl.y, matrix, project, shiftAndRotate, scale),
getPoint(rb.x, rb.y, matrix, project, shiftAndRotate, scale),
getPoint(tl.x, rb.y, matrix, project, shiftAndRotate, scale),
getPoint(rb.x, tl.y, matrix, project, shiftAndRotate, scale)
].sort(sortPoints),
from = points[0].o,
to = points[3].o,
stops = grad.rescale(gradient.colors, from, to),
//angle2 = Math.atan2(Math.abs(points[3].r.y - points[0].r.y) * (f2.y - f1.y), Math.abs(points[3].r.x - points[0].r.x) * (f2.x - f1.x));
angle2 = Math.atan2(points[3].r.y - points[0].r.y, points[3].r.x - points[0].r.x);
return {
type: "linear",
x1: points[0].p.x, y1: points[0].p.y, x2: points[3].p.x, y2: points[3].p.y,
colors: stops,
// additional helpers (for VML)
angle: angle
};
};
return grad;
});
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