What exactly is the problem we are trying to solve?

Randy did a beautiful example of moving across a grid in his Lesson 7 showing how moving across a grid can be used to measure area. In fact I believe he did it without using gridding.

Now one thing I have been struggling with is how to measure perimeter. I saw Randy do it using Polygons.

But not sure how to do it when placing Squares in a Playfield to create a shape.

Any suggestions or a script would be appreciated.

Stephen

On Mon, Mar 22, 2010 at 12:28 PM, Rita Freudenberg <rita@isg.cs.uni-magdeburg.de> wrote:

'forward by' when snap to grid is true move one gridspace forward.
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Key: SQ-682
URL: http://tracker.squeakland.org/browse/SQ-682
Project: squeakland
Issue Type: Feature
Components: etoys
Reporter: Karl Ramberg

When snap to grid is turned on it would be nice if forward by moved the
player one grid space forward. Like wise for all the height, width turn etc
that they reflected the preference griding and showed the grid values
instead of the pixel values.

Bert Freudenberg commented on SQ-682:
-------------------------------------

I don't think this would be a good idea. The gridding is for manual
placement of objects.

But feel free to discuss on the squeakland list (since this is changing
behavior, it's not just for developers).

I agree it's a big change and maybe you are right.
Maybe it' just complicates stuff unnecessary.

But we kind of do this on the pixel grid already by moving one pixel
forward ;-)

Another related change is defining movement to for example centimeters
instead of pixels.

But it is a fundamental change and need more discussion.

Randy, what do you think, would you like to have that for your perimeter lessons? Maybe to write a script to calculate the perimeter?

Rita

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