[echarts-doc] 01/01: fix: add color desc for en

[ovilia]

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ovilia pushed a commit to branch fix-gradient
in repository https://gitbox.apache.org/repos/asf/echarts-doc.git

commit 5e6ba8bbad8270d85b8c792039fa34042aa8548f
Author: Ovilia <zwl.s...@gmail.com>
AuthorDate: Tue Jan 18 13:42:13 2022 +0800

    fix: add color desc for en
---
 en/option/option.md | 40 +++++++++++++++++++++++++++++++++++++++-
 zh/option/option.md |  2 +-
 2 files changed, 40 insertions(+), 2 deletions(-)

diff --git a/en/option/option.md b/en/option/option.md
index 6ecff7e..510f8b7 100644
--- a/en/option/option.md
+++ b/en/option/option.md
@@ -59,6 +59,45 @@ Defaults:
 ['#5470c6', '#91cc75', '#fac858', '#ee6666', '#73c0de', '#3ba272', '#fc8452', 
'#9a60b4', '#ea7ccc']
 ```
 
+Supported color formats.
+
++ Use RGB for colors, like `'rgb(128, 128, 128)'`, or RGBA if you want to add 
an alpha channel for opacity, like `'rgba(128, 128, 128, 0.5)`, or use hex 
string, like `'#ccc'`.
+
++ Gradient Color or Texture
+```js
+// Linear gradient with first four parameters x0, y0, x2, y2, ranging from 0 - 
1, corresponding to the percentage in the graphical wraparound box, if 
globalCoord is ``true``, then the four values are absolute pixel positions
+{
+    type: 'linear',
+    x: 0,
+    y: 0,
+    x2: 0,
+    y2: 1,
+    colorStops: [{
+        offset: 0, color: 'red' // color at 0%
+    }, {
+        offset: 1, color: 'blue' // color at 100%
+    }],
+    global: false // default is false
+}
+// Radial gradient, the first three parameters are the center x, y and radius, 
the values are the same as the linear gradient
+{
+    type: 'radial',
+    x: 0.5,
+    y: 0.5,
+    r: 0.5,
+    colorStops: [{
+        offset: 0, color: 'red' // color at 0%
+    }, {
+        offset: 1, color: 'blue' // color at 100%
+    }],
+    global: false // default is false
+}
+// Texture fill
+{
+    image: imageDom, // supported as HTMLImageElement, HTMLCanvasElement, path 
string not supported
+    repeat: 'repeat' // whether to tile, can be 'repeat-x', 'repeat-y', 
'no-repeat'
+}
+```
 
 # backgroundColor(Color)
 Background color. Defaults to have no background.
@@ -177,4 +216,3 @@ color: {
     repeat: 'repeat' // whether to repeat texture, whose value can be 
repeat-x, repeat-y, or no-repeat
 }
 ```
-
diff --git a/zh/option/option.md b/zh/option/option.md
index 2b2f863..b61eb4a 100644
--- a/zh/option/option.md
+++ b/zh/option/option.md
@@ -66,7 +66,7 @@
 
 支持的颜色格式：
 
-+ 使用 RGB 表示纯颜色，比如 `'rgb(128, 128, 128)'`，如果想要加上 alpha 通道表示不透明度，可以使用 RGBA，比如 
`'rgba(128, 128, 128, 0.5)'`，也可以使用十六进制格式，比如 `'#ccc'`。
++ 使用 RGB 表示颜色，比如 `'rgb(128, 128, 128)'`，如果想要加上 alpha 通道表示不透明度，可以使用 RGBA，比如 
`'rgba(128, 128, 128, 0.5)'`，也可以使用十六进制格式，比如 `'#ccc'`。
 
 + 渐变色或者纹理填充
 ```js

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