Labels:book | bulletin board | reckoner | sky | tree | windowpane OCR: Lesson 19 1-97 The first thing we have to op is erase whatever was in the view area before and then we have to draw rectangle as a border around the view, Now remember that the graphic drawing will be done as result of a DRAW message being sent to dPane and that at this time the rectangle tempRect will have been set to the border of the view. This makes our job easy -we simply write clear: tempRect draw tempRect. The other task for @DPARMS is to fetch the current readings of each control. The words of f the four following definitions should look familiar The definitions are extensions of the spiral, spin, li and dragon curves defined in Turtle Here, however, they have been- -modi fied to fetch three control paameters, place those numbers as ivars of the drawing device (the pen or poly, as ...
