On Thu, Aug 7, 2008 at 11:26 AM, Alan Gauld <[EMAIL PROTECTED]> wrote: > "Dick Moores" <[EMAIL PROTECTED]> wrote > >> 1. The turtle has some behavior I don't see how to eliminate. If you >> refer to lines 223, 225, 227, 229, etc., you'll see that the turtle >> always faces in the direction it is moving when drawing a rectangle. > > That is correct behaviour for a turtle!
Yes. I wanted that, and set it accordingly. Those lines refer to the program using the 2.5 turtle.py. > Remember turtle graphics are notionally about moving a physical > drawing device (the turtle) around on the floor or desk. If the turtle > doesn't turn to face the direction of travel it can't travel that way! > > IMHO that's just a feature of the technology and any other behaviour > would be out of keeping with the intent. Actually, if you look at those lines, I had to go to some trouble to get the turtle to do that! >> Using the Python2.6 beta2 version of turtle.py, the turtle can be seen >> at each corner spinning to orient itself to the new direction. I don't >> want this. > > While far from common in turtle implementations (I have only seen > it in my old CP/M Logo version) it is a feature that would be true > of a physical turtle too. Its not really a bug but a "feature" I guess! I finally found how to make the turtle disappear permanently. In the new turtle.py, the code is "hideturtle()". >> 2. The turtle can also be seen moving from the last corner of the last >> rectangle to the first corner of the next. I don't want this. > > Again true of a physical turtle... But if you set speed to fastest > does that work? Also in the old turtle moduile there was a way to > hide the turtles movements completely and just draw the finished > graphic - which was orders of magnitude faster for complex > shapes - is that still available in turtle26? Yes, penup(). <http://docs.python.org/dev/library/turtle.html#turtle.penup> > One way to hide the turtle would be top change colour to the Thanks for thinking about it, but with hideturtle() I'm a happy camper. >> 3. When the screen is cleared between cycles by line 367, the blank >> screen shows for a second or so. I don't want this. >> In my program using the old turtle I've had to create >> colored-backgrounds by drawing a rectangle almost as large as the >> screen (see my draw_background() beginning at line 365). With the new >> turtle, the background color can be set by, for example, >> screen.bgcolor("orange"). But even so, in the V16 I was trying to >> write, that blank screen still shows for a second or so. With the old >> turtle, the transition from one "background" to another seems >> instantaneous. No white blank screen visible at all. Solved that. I'm pasting the version that uses the new turtle.py. <http://py77.python.pastebin.com/f657deaaf>. This runs fine, but I'll be doing more work on it. > Sounds like a valid complaint that one... >> 4. I've attempted to make the turtle invisible, but haven't succeeded. See above. > Should be possible to set color to bgcolor. but set it back to > draw the lines or they too will be invisible! > >> I'm guessing that all the problems I've mentioned aren't the result of >> bugs--rather, I just don't understand the doc. > > Maybe more not understanding(remembering) the origin of turtle graphics. > It was for kids to understand computer graphics... Seeing the shapes > being drawn is a big part of that. Well, I also want to see the rectangles being drawn--by an invisible turtle. ;-) Actually, I got interested in this because of the colors. I had just bought my first LCD monitor, a 22-incher. And I wrote the program so that it prints the color names to the console window. I had been ignorant about colors--had no idea what magenta, chartreuse, turquoise, cyan were, just to mention a few. Thanks, Alan. Dick _______________________________________________ Tutor maillist - [email protected] http://mail.python.org/mailman/listinfo/tutor
