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Implement text rendering along paths

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This commit also changes the TextReplay.drawText() signature, and moves
geometry calculation into drawText(). This improves performance where no
text needs to be rendered (TextStyle.getText() == ''), which is used often
in applications.
This commit is contained in:
Andreas Hocevar
2017-09-07 23:32:31 +02:00
parent 37dcd79a86
commit efc86d59b0
12 changed files with 640 additions and 189 deletions
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34
src/ol/render/webgl/textreplay.js
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@@ -3,6 +3,7 @@ goog.provide('ol.render.webgl.TextReplay');
goog.require('ol');
goog.require('ol.colorlike');
goog.require('ol.dom');
goog.require('ol.geom.GeometryType');
goog.require('ol.has');
goog.require('ol.render.replay');
goog.require('ol.render.webgl');
@@ -118,9 +119,38 @@ ol.inherits(ol.render.webgl.TextReplay, ol.render.webgl.TextureReplay);
/**
* @inheritDoc
*/
ol.render.webgl.TextReplay.prototype.drawText = function(flatCoordinates, offset,
end, stride, geometry, feature) {
ol.render.webgl.TextReplay.prototype.drawText = function(geometry, feature) {
if (this.text_) {
var flatCoordinates = null;
var offset = 0;
var end = 2;
var stride = 2;
switch (geometry.getType()) {
case ol.geom.GeometryType.POINT:
case ol.geom.GeometryType.MULTI_POINT:
flatCoordinates = geometry.getFlatCoordinates();
end = flatCoordinates.length;
stride = geometry.getStride();
break;
case ol.geom.GeometryType.CIRCLE:
flatCoordinates = /** @type {ol.geom.Circle} */ (geometry).getCenter();
break;
case ol.geom.GeometryType.LINE_STRING:
flatCoordinates = /** @type {ol.geom.LineString} */ (geometry).getFlatMidpoint();
break;
case ol.geom.GeometryType.MULTI_LINE_STRING:
flatCoordinates = /** @type {ol.geom.MultiLineString} */ (geometry).getFlatMidpoints();
end = flatCoordinates.length;
break;
case ol.geom.GeometryType.POLYGON:
flatCoordinates = /** @type {ol.geom.Polygon} */ (geometry).getFlatInteriorPoint();
break;
case ol.geom.GeometryType.MULTI_POLYGON:
flatCoordinates = /** @type {ol.geom.MultiPolygon} */ (geometry).getFlatInteriorPoints();
end = flatCoordinates.length;
break;
default:
}
this.startIndices.push(this.indices.length);
this.startIndicesFeature.push(feature);