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Transform tile-pixels coordinates only once

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This allows us to simplify the vector tile renderer significantly, because
there are no more coordinates that need special tile-pixel handling.
This commit is contained in:
Andreas Hocevar
2017-08-28 19:02:19 +02:00
parent 989b047dc1
commit 4b4f383043
9 changed files with 167 additions and 132 deletions
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36
src/ol/render/feature.js
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@@ -3,12 +3,14 @@ goog.provide('ol.render.Feature');
goog.require('ol');
goog.require('ol.extent');
goog.require('ol.geom.GeometryType');
goog.require('ol.geom.flat.transform');
goog.require('ol.transform');
/**
* Lightweight, read-only, {@link ol.Feature} and {@link ol.geom.Geometry} like
* structure, optimized for rendering and styling. Geometry access through the
* API is limited to getting the type and extent of the geometry.
* structure, optimized for vector tile rendering and styling. Geometry access
* through the API is limited to getting the type and extent of the geometry.
*
* @constructor
* @param {ol.geom.GeometryType} type Geometry type.
@@ -54,6 +56,13 @@ ol.render.Feature = function(type, flatCoordinates, ends, properties, id) {
* @type {Object.<string, *>}
*/
this.properties_ = properties;
/**
* @private
* @type {ol.Transform}
*/
this.tmpTransform_ = ol.transform.create();
};
@@ -71,7 +80,8 @@ ol.render.Feature.prototype.get = function(key) {
/**
* @return {Array.<number>|Array.<Array.<number>>} Ends or endss.
*/
ol.render.Feature.prototype.getEnds = function() {
ol.render.Feature.prototype.getEnds =
ol.render.Feature.prototype.getEndss = function() {
return this.ends_;
};
@@ -169,3 +179,23 @@ ol.render.Feature.prototype.getStyleFunction = ol.nullFunction;
ol.render.Feature.prototype.getType = function() {
return this.type_;
};
/**
* Transform geometry coordinates from tile pixel space to projected.
* The SRS of the source and destination are expected to be the same.
*
* @param {ol.ProjectionLike} source The current projection
* @param {ol.ProjectionLike} destination The desired projection.
*/
ol.render.Feature.prototype.transform = function(source, destination) {
var pixelExtent = source.getExtent();
var projectedExtent = source.getWorldExtent();
var scale = ol.extent.getHeight(projectedExtent) / ol.extent.getHeight(pixelExtent);
var transform = this.tmpTransform_;
ol.transform.compose(transform,
projectedExtent[0], projectedExtent[3],
scale, -scale, 0,
0, 0);
ol.geom.flat.transform.transform2D(this.flatCoordinates_, 0, this.flatCoordinates_.length, 2,
transform, this.flatCoordinates_);
};