Fix MotionStreak initializing and avoid trail delay by one frame (#10982

) * Fix MotionStreak initializing and avoid trail delay by one frame * Read motion streak start position just before rendering * avoid using public method
cocos · Jul 19, 2022 · 8505995 · 8505995
1 parent a8fc3de
commit 8505995
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Showing 2 changed files with 8 additions and 5 deletions.
diff --git a/cocos2d/core/components/CCMotionStreak.js b/cocos2d/core/components/CCMotionStreak.js
@@ -62,6 +62,7 @@ var MotionStreak = cc.Class({
     ctor () {
         this._points = [];
         this._lastWPos = new cc.Vec2();
+        this._lastWPosUpdated = false;
     },
 
     properties: {
@@ -248,8 +249,7 @@ var MotionStreak = cc.Class({
     reset () {
         this._points.length = 0;
         this._assembler && this._assembler._renderData.clear();
-        this._lastWPos.x = 0;
-        this._lastWPos.y = 0;
+        this._lastWPosUpdated = false;
         if (CC_EDITOR) {
             cc.engine.repaintInEditMode();
         }

diff --git a/cocos2d/core/renderer/webgl/assemblers/motion-streak.js b/cocos2d/core/renderer/webgl/assemblers/motion-streak.js
@@ -24,6 +24,7 @@
  ****************************************************************************/
 
 import Assembler2D from '../../assembler-2d';
+import Mat4 from '../../../value-types/mat4';
 
 const MotionStreak = require('../../../components/CCMotionStreak');
 const RenderFlow = require('../../render-flow');
@@ -49,6 +50,7 @@ let _tangent = cc.v2();
 let _miter = cc.v2();
 let _normal = cc.v2();
 let _vec2 = cc.v2();
+let _worldMat = new Mat4();
 
 function normal (out, dir) {
     //get perpendicular
@@ -92,14 +94,14 @@ export default class MotionStreakAssembler extends Assembler2D {
         let stroke = comp._stroke / 2;
 
         let node = comp.node;
-        let matrix = node._worldMatrix.m;
-        let tx = matrix[12], ty = matrix[13];
+        node.getWorldMatrix(_worldMat);
+        let tx = _worldMat.m[12], ty = _worldMat.m[13];
 
         let points = comp._points;
         let lastPos = comp._lastWPos;
         let fadeTime = comp._fadeTime;
 
-        let moved = lastPos.x !== tx || lastPos.y !== ty;
+        let moved = comp._lastWPosUpdated && (lastPos.x !== tx || lastPos.y !== ty);
         if (moved) {
             let cur;
             let newHead = false;
@@ -144,6 +146,7 @@ export default class MotionStreakAssembler extends Assembler2D {
 
         lastPos.x = tx;
         lastPos.y = ty;
+        comp._lastWPosUpdated = true;
 
         if (points.length < 2) {
             return;