[Add]CTA模块新增getPriceTick函数

vnpy/trader/app/ctaStrategy/ctaBacktesting.py

@@ -568,8 +568,12 @@ class BacktestingEngine(object):
     def saveSyncData(self, strategy):
         """保存同步数据（无效）"""
         pass
-        
-
+    
+    #----------------------------------------------------------------------
+    def getPriceTick(self, strategy):
+        """获取最小价格变动"""
+        return self.priceTick
+    
     #------------------------------------------------
     # 结果计算相关
     #------------------------------------------------      

vnpy/trader/app/ctaStrategy/ctaEngine.py

@@ -643,3 +643,12 @@ class CtaEngine(object):
             else:
                 self.cancelOrder(orderID)
 
+    #----------------------------------------------------------------------
+    def getPriceTick(self, strategy):
+        """获取最小价格变动"""
+        contract = self.mainEngine.getContract(strategy.vtSymbol)
+        if contract:
+            return contract.priceTick
+        return 0
+        
+        

vnpy/trader/app/ctaStrategy/ctaTemplate.py

@@ -195,6 +195,12 @@ class CtaTemplate(object):
         if self.trading:
             self.ctaEngine.saveSyncData(self)
     
+    #----------------------------------------------------------------------
+    def getPriceTick(self):
+        """查询最小价格变动"""
+        return self.ctaEngine.getPriceTick(self)
+        
+
 
 ########################################################################
 class TargetPosTemplate(CtaTemplate):