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new 006a101 doc: hoverLayerThreshold is missing in en option
006a101 is described below
commit 006a10147cb34fd0e1e4f6c6c86eb1ab03c6afd1
Author: Ovilia <[email protected]>
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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