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Optional extra stops to refine extent transforms

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Add optional extra stops to refine some non-parallel transforms

Refine extent transforms use by Gratucule by using 32 points (8 per side) instead of the standard corners only transform
Update Graticule class description with current limitations

Correct projection extent in Mollweide example and revise opening zoom level correspondingly
This commit is contained in:
mike-000
2020-02-22 22:40:29 +00:00
parent 05d3386995
commit 6ae6d0b835
4 changed files with 40 additions and 17 deletions
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src/ol/layer/Graticule.js
+4 -3
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@@ -144,7 +144,8 @@ const INTERVALS = [
/**
* @classdesc
* Layer that renders a grid for a coordinate system.
* Layer that renders a grid for a coordinate system (currently only EPSG:4326 is supported).
* Note that the view projection must define both extent and worldExtent.
*
* @fires import("../render/Event.js").RenderEvent
* @api
@@ -677,7 +678,7 @@ class Graticule extends VectorLayer {
Math.min(extent[3], this.maxLatP_)
];
validExtent = transformExtent(validExtent, this.projection_, 'EPSG:4326');
validExtent = transformExtent(validExtent, this.projection_, 'EPSG:4326', 8);
const maxLat = validExtent[3];
const maxLon = validExtent[2];
const minLat = validExtent[1];
@@ -896,7 +897,7 @@ class Graticule extends VectorLayer {
const epsg4326Projection = getProjection('EPSG:4326');
const worldExtent = projection.getWorldExtent();
const worldExtentP = transformExtent(worldExtent, epsg4326Projection, projection);
const worldExtentP = transformExtent(worldExtent, epsg4326Projection, projection, 8);
this.maxLat_ = worldExtent[3];
this.maxLon_ = worldExtent[2];