diff --git a/src/chart/helper/EffectLine.ts b/src/chart/helper/EffectLine.ts
index f368d83ac0..195783ed7e 100644
--- a/src/chart/helper/EffectLine.ts
+++ b/src/chart/helper/EffectLine.ts
@@ -207,7 +207,7 @@ class EffectLine extends graphic.Group {
const p1 = symbol.__p1;
const p2 = symbol.__p2;
const cp1 = symbol.__cp1;
- const t = symbol.__t < 1 ? symbol.__t : 2 - symbol.__t;
+ const t = symbol.__t <= 1 ? symbol.__t : 2 - symbol.__t;
const pos = [symbol.x, symbol.y];
const lastPos = pos.slice();
const quadraticAt = curveUtil.quadraticAt;
@@ -216,9 +216,9 @@ class EffectLine extends graphic.Group {
pos[1] = quadraticAt(p1[1], cp1[1], p2[1], t);
// Tangent
- const tx = symbol.__t < 1 ? quadraticDerivativeAt(p1[0], cp1[0], p2[0], t)
+ const tx = symbol.__t <= 1 ? quadraticDerivativeAt(p1[0], cp1[0], p2[0], t)
: quadraticDerivativeAt(p2[0], cp1[0], p1[0], 1 - t);
- const ty = symbol.__t < 1 ? quadraticDerivativeAt(p1[1], cp1[1], p2[1], t)
+ const ty = symbol.__t <= 1 ? quadraticDerivativeAt(p1[1], cp1[1], p2[1], t)
: quadraticDerivativeAt(p2[1], cp1[1], p1[1], 1 - t);
diff --git a/src/chart/helper/EffectPolyline.ts b/src/chart/helper/EffectPolyline.ts
index 389dbe4d83..282df0725f 100644
--- a/src/chart/helper/EffectPolyline.ts
+++ b/src/chart/helper/EffectPolyline.ts
@@ -67,7 +67,7 @@ class EffectPolyline extends EffectLine {
// Override
protected _updateSymbolPosition(symbol: ECSymbolOnEffectLine) {
- const t = symbol.__t < 1 ? symbol.__t : 2 - symbol.__t;
+ const t = symbol.__t <= 1 ? symbol.__t : 2 - symbol.__t;
const points = this._points;
const offsets = this._offsets;
const len = points.length;
@@ -107,8 +107,8 @@ class EffectPolyline extends EffectLine {
symbol.x = p0[0] * (1 - p) + p * p1[0];
symbol.y = p0[1] * (1 - p) + p * p1[1];
- const tx = symbol.__t < 1 ? p1[0] - p0[0] : p0[0] - p1[0];
- const ty = symbol.__t < 1 ? p1[1] - p0[1] : p0[1] - p1[1];
+ const tx = symbol.__t <= 1 ? p1[0] - p0[0] : p0[0] - p1[0];
+ const ty = symbol.__t <= 1 ? p1[1] - p0[1] : p0[1] - p1[1];
symbol.rotation = -Math.atan2(ty, tx) - Math.PI / 2;
this._lastFrame = frame;
diff --git a/test/lines-symbol.html b/test/lines-symbol.html
index 560da4b6c8..d22371fb3f 100644
--- a/test/lines-symbol.html
+++ b/test/lines-symbol.html
@@ -23,27 +23,19 @@
-
-
-
+
+
+
-
-
-
+
+
-