Merge pull request #519 from ecomfe/fix/rect-text-svg

Fix/rect text svg

Author: 100pah

src/contain/text.js

@@ -155,6 +155,7 @@ export function calculateTextPosition(out, style, rect) {
 
     var x = rect.x;
     var y = rect.y;
+    distance = distance || 0;
 
     var height = rect.height;
     var width = rect.width;

src/graphic/Style.js

@@ -295,23 +295,31 @@ Style.prototype = {
 
     /**
      * Whether transform text.
-     * Only useful in Path and Image element
+     * Only available in Path and Image element,
+     * where the text is called as `RectText`.
      * @type {boolean}
      */
     transformText: false,
 
     /**
-     * Text rotate around position of Path or Image
-     * Only useful in Path and Image element and transformText is false.
+     * Text rotate around position of Path or Image.
+     * The origin of the rotation can be specified by `textOrigin`.
+     * Only available in Path and Image element,
+     * where the text is called as `RectText`.
      */
     textRotation: 0,
 
     /**
-     * Text origin of text rotation, like [10, 40].
-     * Based on x, y of rect.
-     * Useful in label rotation of circular symbol.
-     * By default, this origin is textPosition.
-     * Can be 'center'.
+     * Text origin of text rotation.
+     * Useful in the case like label rotation of circular symbol.
+     * Only available in Path and Image element, where the text is called
+     * as `RectText` and the element is called as "host element".
+     * The value can be:
+     * + If specified as a coordinate like `[10, 40]`, it is the `[x, y]`
+     * base on the left-top corner of the rect of its host element.
+     * + If specified as a string `center`, it is the center of the rect of
+     * its host element.
+     * + By default, this origin is the `textPosition`.
      * @type {string|Array.<number>}
      */
     textOrigin: null,