This variable is used in the following components:
1 VectorTileMapOutputFormat.java
1) Generate the paintArea:
paintArea = new Rectangle(this.tileBuilderFactory.getOversampleX() *
mapWidth, this.tileBuilderFactory.getOversampleY() * mapHeight);
2) Generate the buffer:
if (this.tileBuilderFactory.shouldOversampleScale()) { // buffer
is in pixels (style pixels), need to convert to paint area pixels
buffer *= Math.max(Math.max(
this.tileBuilderFactory.getOversampleX(),this.tileBuilderFactory.getOversampleY()),1);
// if 0 (i.e. test case), don't expand }
2 PipelineBuilder.java
1) Create the context:
context.screenSimplificationDistance = PIXEL_BASE_SAMPLE_SIZE /
overSampleFactor; context.targetCRSSimplificationDistance =
Math.min(spans_targetCRS[0], spans_targetCRS[1]) / overSampleFactor;
context.screenMap.setSpans(spans_sourceCRS[0] / overSampleFactor,
spans_sourceCRS[1] / overSampleFactor);
And from MapBoxTileBuilderFactory I found this:
/** * For Mapbox tiles, since they are rendered in screen/tile space,
oversampling produces more * consistent results when zooming. See this
question here: * *
<p>https://github.com/mapbox/vector-tiles/issues/45 */ @Override
public boolean shouldOversampleScale() { return true; }
However the link is broken. :(
And as far as I know, the vector tile extent is 4096, but when I request a
vector tile with 256x256, the paintArea at runtime will be 4096*4096 and
8192*8192 for 512x512 tile request.
Also it seems that this variable still influences the simplification.
So anyone can provide an explanation?
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