From 89221c831217f0b17da5f88d6f3c2426ca64ee9a Mon Sep 17 00:00:00 2001
From: Ovilia <zwl.sjtu@gmail.com>
Date: Thu, 12 Dec 2019 16:20:34 +0800
Subject: [PATCH] feat(markLine): provide new layouts for markLine labels
 #11569

---
 src/chart/helper/Line.js              | 103 +++++++++++++++++++-------
 src/component/marker/MarkLineModel.js |   3 +-
 2 files changed, 79 insertions(+), 27 deletions(-)

diff --git a/src/chart/helper/Line.js b/src/chart/helper/Line.js
index 2b81a7a432..e52dcc22ec 100644
--- a/src/chart/helper/Line.js
+++ b/src/chart/helper/Line.js
@@ -141,39 +141,88 @@ function updateSymbolAndLabelBeforeLineUpdate() {
         var textPosition;
         var textAlign;
         var textVerticalAlign;
-
-        var distance = 5 * invScale;
-        // End
-        if (label.__position === 'end') {
-            textPosition = [d[0] * distance + toPos[0], d[1] * distance + toPos[1]];
-            textAlign = d[0] > 0.8 ? 'left' : (d[0] < -0.8 ? 'right' : 'center');
-            textVerticalAlign = d[1] > 0.8 ? 'top' : (d[1] < -0.8 ? 'bottom' : 'middle');
+        var textOrigin;
+
+        var distance = label.__labelDistance * invScale;
+        var halfPercent = percent / 2;
+        var tangent = line.tangentAt(halfPercent);
+        var n = [tangent[1], -tangent[0]];
+        var cp = line.pointAt(halfPercent);
+        if (n[1] > 0) {
+            n[0] = -n[0];
+            n[1] = -n[1];
         }
-        // Middle
-        else if (label.__position === 'middle') {
-            var halfPercent = percent / 2;
-            var tangent = line.tangentAt(halfPercent);
-            var n = [tangent[1], -tangent[0]];
-            var cp = line.pointAt(halfPercent);
-            if (n[1] > 0) {
-                n[0] = -n[0];
-                n[1] = -n[1];
-            }
-            textPosition = [cp[0] + n[0] * distance, cp[1] + n[1] * distance];
-            textAlign = 'center';
-            textVerticalAlign = 'bottom';
+        var dir = tangent[0] < 0 ? -1 : 1;
+
+        if (label.__position !== 'start' && label.__position !== 'end') {
             var rotation = -Math.atan2(tangent[1], tangent[0]);
             if (toPos[0] < fromPos[0]) {
                 rotation = Math.PI + rotation;
             }
             label.attr('rotation', rotation);
         }
-        // Start
-        else {
-            textPosition = [-d[0] * distance + fromPos[0], -d[1] * distance + fromPos[1]];
-            textAlign = d[0] > 0.8 ? 'right' : (d[0] < -0.8 ? 'left' : 'center');
-            textVerticalAlign = d[1] > 0.8 ? 'bottom' : (d[1] < -0.8 ? 'top' : 'middle');
+
+        var dy;
+        switch (label.__position) {
+            case 'insideStartTop':
+            case 'insideMiddleTop':
+            case 'insideEndTop':
+            case 'middle':
+                dy = -distance;
+                textVerticalAlign = 'bottom';
+                break;
+
+            case 'insideStartBottom':
+            case 'insideMiddleBottom':
+            case 'insideEndBottom':
+                dy = distance;
+                textVerticalAlign = 'top';
+                break;
+
+            default:
+                dy = 0;
+                textVerticalAlign = 'middle';
         }
+
+        switch (label.__position) {
+            case 'end':
+                textPosition = [d[0] * distance + toPos[0], d[1] * distance + toPos[1]];
+                textAlign = d[0] > 0.8 ? 'left' : (d[0] < -0.8 ? 'right' : 'center');
+                textVerticalAlign = d[1] > 0.8 ? 'top' : (d[1] < -0.8 ? 'bottom' : 'middle');
+                break;
+
+            case 'start':
+                textPosition = [-d[0] * distance + fromPos[0], -d[1] * distance + fromPos[1]];
+                textAlign = d[0] > 0.8 ? 'right' : (d[0] < -0.8 ? 'left' : 'center');
+                textVerticalAlign = d[1] > 0.8 ? 'bottom' : (d[1] < -0.8 ? 'top' : 'middle');
+                break;
+
+            case 'insideStartTop':
+            case 'insideStart':
+            case 'insideStartBottom':
+                textPosition = [distance * dir + fromPos[0], fromPos[1] + dy];
+                textAlign = tangent[0] < 0 ? 'right' : 'left';
+                textOrigin = [-distance * dir, -dy];
+                break;
+
+            case 'insideMiddleTop':
+            case 'insideMiddle':
+            case 'insideMiddleBottom':
+            case 'middle':
+                textPosition = [cp[0], cp[1] + dy];
+                textAlign = 'center';
+                textOrigin = [0, -dy];
+                break;
+
+            case 'insideEndTop':
+            case 'insideEnd':
+            case 'insideEndBottom':
+                textPosition = [-distance * dir + toPos[0], toPos[1] + dy];
+                textAlign = tangent[0] >= 0 ? 'right' : 'left';
+                textOrigin = [distance * dir, -dy];
+                break;
+        }
+
         label.attr({
             style: {
                 // Use the user specified text align and baseline first
@@ -181,7 +230,8 @@ function updateSymbolAndLabelBeforeLineUpdate() {
                 textAlign: label.__textAlign || textAlign
             },
             position: textPosition,
-            scale: [invScale, invScale]
+            scale: [invScale, invScale],
+            origin: textOrigin
         });
     }
 }
@@ -357,6 +407,7 @@ lineProto._updateCommonStl = function (lineData, idx, seriesScope) {
         label.__verticalAlign = labelStyle.textVerticalAlign;
         // 'start', 'middle', 'end'
         label.__position = labelModel.get('position') || 'middle';
+        label.__labelDistance = labelModel.get('distance');
     }
 
     if (emphasisText != null) {
diff --git a/src/component/marker/MarkLineModel.js b/src/component/marker/MarkLineModel.js
index f241fce1d8..077e5b95a9 100644
--- a/src/component/marker/MarkLineModel.js
+++ b/src/component/marker/MarkLineModel.js
@@ -38,7 +38,8 @@ export default MarkerModel.extend({
         },
         label: {
             show: true,
-            position: 'end'
+            position: 'end',
+            distance: 5
         },
         lineStyle: {
             type: 'dashed'