<transcript><audio_70>source including wikipedia on the net and in any case that calculation is not a par not the main point of this session and so we are not going to go into it all right so that finishes the first demo</transcript><transcript><audio_71>the second demo deals with creating user interfaces so we are going to create an interface based on buttons to control our turtle in the first session on graphics we studied turtle graphics</transcript><transcript><audio_72>and we were able to control the turtle through the program using commands forward left and right so for example we said forward hundred which caused the turtle to go forward by 100 pixels</transcript><transcript><audio_73>after the program was had started execution the user didn't really have a role in what to do with the turtle now we are going to write a slightly different program in which the user can control the turtle</transcript><transcript><audio_74>after the program has started execution so we'll show you a new way of controlling the turtle the user can click something called the button or something which you have normally seen as a button on the canvas to move the turtle forward</transcript><transcript><audio_75>and another button to turn the turtle of course we could have put in many more buttons but we just want to illustrate the creation and use of buttons and you are encouraged to develop a very nice interface of the same kind</transcript><transcript><audio_76>much more as much more or as elaborate as you would care to make it we note that a button on a on the canvas is merely a rectangle with some text inside it what makes it a button what makes a</transcript> source including wikipedia on the net and in any case that calculation is not a par not the main point of this session and so we are not going to go into it all right so that finishes the first demo the second demo deals with creating user interfaces so we are going to create an interface based on buttons to control our turtle in the first session on graphics we studied turtle graphics and we were able to control the turtle through the program using commands forward left and right so for example we said forward hundred which caused the turtle to go forward by 100 pixels after the program was had started execution the user didn't really have a role in what to do with the turtle now we are going to write a slightly different program in which the user can control the turtle after the program has started execution so we'll show you a new way of controlling the turtle the user can click something called the button or something which you have normally seen as a button on the canvas to move the turtle forward and another button to turn the turtle of course we could have put in many more buttons but we just want to illustrate the creation and use of buttons and you are encouraged to develop a very nice interface of the same kind much more as much more or as elaborate as you would care to make it we note that a button on a on the canvas is merely a rectangle with some text inside it what makes it a button what makes a
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