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Handle projections in feet in scale line control

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This commit is contained in:
Tom Payne
2013-03-04 10:26:06 +01:00
parent 87d6208403
commit b9a9e84c1b
1 changed files with 17 additions and 9 deletions
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src/ol/control/scalelinecontrol.js
+17 -9
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@@ -168,11 +168,13 @@ ol.control.ScaleLine.prototype.updateElement_ = function(frameState) {
this.toEPSG4326_ = null; this.toEPSG4326_ = null;
cosLatitude = Math.cos(goog.math.toRadians(center.y)); cosLatitude = Math.cos(goog.math.toRadians(center.y));
pointResolution *= Math.PI * cosLatitude * ol.sphere.NORMAL.radius / 180; pointResolution *= Math.PI * cosLatitude * ol.sphere.NORMAL.radius / 180;
projectionUnits = ol.ProjectionUnits.METERS;
} else if (projectionUnits == ol.ProjectionUnits.METERS && } else if ((projectionUnits == ol.ProjectionUnits.FEET ||
projectionUnits == ol.ProjectionUnits.METERS) &&
this.units_ == ol.control.ScaleLineUnits.DEGREES) { this.units_ == ol.control.ScaleLineUnits.DEGREES) {
// Convert pointResolution from meters to degrees // Convert pointResolution from meters or feet to degrees
if (goog.isNull(this.toEPSG4326_)) { if (goog.isNull(this.toEPSG4326_)) {
this.toEPSG4326_ = ol.projection.getTransform( this.toEPSG4326_ = ol.projection.getTransform(
projection, ol.projection.getFromCode('EPSG:4326')); projection, ol.projection.getFromCode('EPSG:4326'));
@@ -180,20 +182,26 @@ ol.control.ScaleLine.prototype.updateElement_ = function(frameState) {
var vertex = [center.x, center.y]; var vertex = [center.x, center.y];
vertex = this.toEPSG4326_(vertex, vertex, 2); vertex = this.toEPSG4326_(vertex, vertex, 2);
cosLatitude = Math.cos(goog.math.toRadians(vertex[1])); cosLatitude = Math.cos(goog.math.toRadians(vertex[1]));
pointResolution *= 180 / (Math.PI * cosLatitude * ol.sphere.NORMAL.radius); var radius = ol.sphere.NORMAL.radius;
if (projectionUnits == ol.ProjectionUnits.FEET) {
radius /= 0.3048;
}
pointResolution *= 180 / (Math.PI * cosLatitude * radius);
projectionUnits = ol.ProjectionUnits.DEGREES;
} else { } else {
this.toEPSG4326_ = null; this.toEPSG4326_ = null;
goog.asserts.assert(
((this.units_ == ol.control.ScaleLineUnits.METRIC ||
this.units_ == ol.control.ScaleLineUnits.IMPERIAL) &&
projectionUnits == ol.ProjectionUnits.METERS) ||
(this.units_ == ol.control.ScaleLineUnits.DEGREES &&
projectionUnits == ol.ProjectionUnits.DEGREES));
} }
goog.asserts.assert(
((this.units_ == ol.control.ScaleLineUnits.METRIC ||
this.units_ == ol.control.ScaleLineUnits.IMPERIAL) &&
projectionUnits == ol.ProjectionUnits.METERS) ||
(this.units_ == ol.control.ScaleLineUnits.DEGREES &&
projectionUnits == ol.ProjectionUnits.DEGREES));
var nominalCount = this.minWidth_ * pointResolution; var nominalCount = this.minWidth_ * pointResolution;
var suffix = ''; var suffix = '';
if (this.units_ == ol.control.ScaleLineUnits.DEGREES) { if (this.units_ == ol.control.ScaleLineUnits.DEGREES) {