Quick-tip 70 explains, with examples, the use of the persist property in drawing objects. It also explains the use of a boolean variable to flag when a drawing object has been added to the chart and why this variable should be set as an intrabarpersist variable.
If persist is set to false and the drawing object it added, it will then disappear on the next tick. To maintain it on the chart it would need to be redrawn each tick.
If persist is set to true, the text object remains on the chart between ticks.
A boolean variable (DrawRect) is used to check if a drawing object has been added to the chart. If the variable is not created as an intrabarpersist variable then its value reverts each tick. This can result in the drawing object being redrawn repeatedly.
If a large number of drawing objects are created by a program it can result in memory issues and the program slowing down.
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