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The following commit(s) were added to refs/heads/master by this push:
     new 006a101  doc: hoverLayerThreshold is missing in en option
006a101 is described below

commit 006a10147cb34fd0e1e4f6c6c86eb1ab03c6afd1
Author: Ovilia <zwl.s...@gmail.com>
AuthorDate: Fri Aug 21 16:12:57 2020 +0800

    doc: hoverLayerThreshold is missing in en option
---
 en/option/option.md | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/en/option/option.md b/en/option/option.md
index f64ba3e..0b08908 100644
--- a/en/option/option.md
+++ b/en/option/option.md
@@ -84,6 +84,14 @@ The default is `'source-over'`. Support settings for each 
series.
 
 `'lighter'` is also a common type of compositing operation. In this mode, the 
area where the number of graphics is concentrated is superimposed into a 
high-brightness color (white). It often used to highlight the effect of the 
area. See example [Global airline](${galleryEditorPath}lines-airline)
 
+# hoverLayerThreshold(number) = 3000
+
+When the number of element of the whole chart is larger than 
`hoverLayerThreshold`, a seperate hover layer is used to render hovered 
elements.
+
+The seperate hover layer is used to avoid re-painting the whole canvas when 
hovering on elements. Instead, the hovered elements are rendered in a seperate 
layer so that other elements don't have to be rendered again.
+
+ECharts 2 use seperate layer for all cases. But it brings some problems like 
the hovered elements may not covering everything else correctly, or translucent 
elements may not overlay correctly to each other. And it brings extra member 
cost due to the extra canvas and may bring burden on mobile devices. So since 
ECharts 3, the hover layer is not used by default. Only when the element amount 
is large enough will the hover layer used.
+
 # useUTC(boolean) = false
 
 Whether to use UTC in display.


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