rename some variables and add comments
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mike-000
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@@ -218,25 +218,25 @@ class Graticule extends VectorLayer {
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* @type {number}
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* @private
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*/
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this.maxLatP_ = Infinity;
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this.maxX_ = Infinity;
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/**
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* @type {number}
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* @private
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*/
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this.maxLonP_ = Infinity;
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this.maxY_ = Infinity;
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/**
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* @type {number}
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* @private
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*/
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this.minLatP_ = -Infinity;
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this.minX_ = -Infinity;
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/**
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* @type {number}
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* @private
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*/
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this.minLonP_ = -Infinity;
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this.minY_ = -Infinity;
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/**
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* @type {number}
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@@ -290,25 +290,25 @@ class Graticule extends VectorLayer {
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* @type {import("../coordinate.js").Coordinate}
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* @private
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*/
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this.blLonLatP_ = null;
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this.bottomLeft_ = null;
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/**
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* @type {import("../coordinate.js").Coordinate}
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* @private
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*/
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this.brLonLatP_ = null;
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this.bottomRight_ = null;
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/**
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* @type {import("../coordinate.js").Coordinate}
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* @private
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*/
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this.tlLonLatP_ = null;
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this.topLeft_ = null;
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/**
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* @type {import("../coordinate.js").Coordinate}
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* @private
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*/
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this.trLonLatP_ = null;
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this.topRight_ = null;
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/**
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* @type {Array<GraticuleLabelDataType>}
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@@ -698,12 +698,18 @@ class Graticule extends VectorLayer {
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return;
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}
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const validCenter = [
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clamp(center[0], this.minLonP_, this.maxLonP_),
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clamp(center[1], this.minLatP_, this.maxLatP_)
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// Constrain the center to fit into the extent available to the graticule
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const validCenterP = [
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clamp(center[0], this.minX_, this.maxX_),
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clamp(center[1], this.minY_, this.maxY_)
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];
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const centerLonLat = this.toLonLatTransform_(validCenter);
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// Transform the center to lon lat
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// Some projections may have a void area at the poles
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// so replace any NaN latitudes with the min or max value closest to a pole
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const centerLonLat = this.toLonLatTransform_(validCenterP);
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if (isNaN(centerLonLat[1])) {
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centerLonLat[1] = Math.abs(this.maxLat_) >= Math.abs(this.minLat_) ?
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this.maxLat_ : this.minLat_;
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@@ -713,32 +719,42 @@ class Graticule extends VectorLayer {
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const maxLines = this.maxLines_;
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let cnt, idx, lat, lon;
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// Limit the extent to fit into the extent available to the graticule
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const validExtentP = [
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clamp(extent[0], this.minLonP_, this.maxLonP_),
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clamp(extent[1], this.minLatP_, this.maxLatP_),
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clamp(extent[2], this.minLonP_, this.maxLonP_),
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clamp(extent[3], this.minLatP_, this.maxLatP_)
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clamp(extent[0], this.minX_, this.maxX_),
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clamp(extent[1], this.minY_, this.maxY_),
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clamp(extent[2], this.minX_, this.maxX_),
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clamp(extent[3], this.minY_, this.maxY_)
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];
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// Transform the extent to get the lon lat ranges for the edges of the extent
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const validExtent = applyTransform(validExtentP, this.toLonLatTransform_, undefined, 8);
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if (containsCoordinate(validExtentP, this.blLonLatP_)) {
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// Check if extremities of the world extent lie inside the extent
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// (for example the pole in a polar projection)
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// and extend the extent as appropriate
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if (containsCoordinate(validExtentP, this.bottomLeft_)) {
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validExtent[0] = this.minLon_;
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validExtent[1] = this.minLat_;
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}
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if (containsCoordinate(validExtentP, this.brLonLatP_)) {
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if (containsCoordinate(validExtentP, this.bottomRight_)) {
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validExtent[2] = this.maxLon_;
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validExtent[1] = this.minLat_;
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}
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if (containsCoordinate(validExtentP, this.tlLonLatP_)) {
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if (containsCoordinate(validExtentP, this.topLeft_)) {
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validExtent[0] = this.minLon_;
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validExtent[3] = this.maxLat_;
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}
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if (containsCoordinate(validExtentP, this.trLonLatP_)) {
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if (containsCoordinate(validExtentP, this.topRight_)) {
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validExtent[2] = this.maxLon_;
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validExtent[3] = this.maxLat_;
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}
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// The transformed center may also extend the lon lat ranges used for rendering
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const maxLat = clamp(validExtent[3], centerLat, this.maxLat_);
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const maxLon = clamp(validExtent[2], centerLon, this.maxLon_);
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const minLat = clamp(validExtent[1], this.minLat_, centerLat);
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@@ -814,6 +830,7 @@ class Graticule extends VectorLayer {
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const p2 = [];
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for (let i = 0, ii = this.intervals_.length; i < ii; ++i) {
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const delta = clamp(this.intervals_[i] / 2, 0, 90);
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// Don't attempt to transform latitudes beyond the poles!
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const clampedLat = clamp(centerLat, -90 + delta, 90 - delta);
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p1[0] = centerLon - delta;
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p1[1] = clampedLat - delta;
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@@ -964,6 +981,9 @@ class Graticule extends VectorLayer {
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this.minLat_ = worldExtent[1];
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this.minLon_ = worldExtent[0];
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// If the world extent crosses the dateline define a custom transform to
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// return longitudes which wrap the dateline
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const toLonLatTransform = getTransform(projection, epsg4326Projection);
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if (this.minLon_ < this.maxLon_) {
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this.toLonLatTransform_ = toLonLatTransform;
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@@ -982,6 +1002,9 @@ class Graticule extends VectorLayer {
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};
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}
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// Transform the extent to get the limits of the view projection extent
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// which should be available to the graticule
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this.fromLonLatTransform_ = getTransform(epsg4326Projection, projection);
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const worldExtentP = applyTransform(
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[this.minLon_, this.minLat_, this.maxLon_, this.maxLat_],
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@@ -990,15 +1013,22 @@ class Graticule extends VectorLayer {
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8
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);
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this.maxLatP_ = worldExtentP[3];
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this.maxLonP_ = worldExtentP[2];
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this.minLatP_ = worldExtentP[1];
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this.minLonP_ = worldExtentP[0];
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this.minX_ = worldExtentP[0];
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this.maxX_ = worldExtentP[2];
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this.minY_ = worldExtentP[1];
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this.maxY_ = worldExtentP[3];
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this.blLonLatP_ = this.fromLonLatTransform_([this.minLon_, this.minLat_]);
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this.brLonLatP_ = this.fromLonLatTransform_([this.maxLon_, this.minLat_]);
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this.tlLonLatP_ = this.fromLonLatTransform_([this.minLon_, this.maxLat_]);
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this.trLonLatP_ = this.fromLonLatTransform_([this.maxLon_, this.maxLat_]);
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// Determine the view projection coordinates of the extremities of the world extent
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// as these may lie inside a view extent (for example the pole in a polar projection)
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this.bottomLeft_ = this.fromLonLatTransform_([this.minLon_, this.minLat_]);
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this.bottomRight_ = this.fromLonLatTransform_([this.maxLon_, this.minLat_]);
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this.topLeft_ = this.fromLonLatTransform_([this.minLon_, this.maxLat_]);
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this.topRight_ = this.fromLonLatTransform_([this.maxLon_, this.maxLat_]);
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// Transform the projection center to lon lat
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// Some projections may have a void area at the poles
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// so replace any NaN latitudes with the min or max value closest to a pole
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this.projectionCenterLonLat_ = this.toLonLatTransform_(getCenter(projection.getExtent()));
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if (isNaN(this.projectionCenterLonLat_[1])) {
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