代码说明： jvTurtle is a non-visible Graphics component that accepts a PainterScript in the form of a string and draws on any canvas that is assigned at run-time to its canvas property. A helpfile on how to use the component and a complete description of the PainterScript graphics language is included. PainterScript includes TurtleGraphics and the use of calculations, variables, procedures and looping. 在窗体上打印字符串

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