Construct a maze with Etoys
Last updated at 11:37 am UTC on 6 May 2019
In the project catalog of the Squeakland web site you find a maze constructor project file.
On this page you will learn how Etoys was used build to build a maze.
This will allow you to generate various kinds of mazes.
This page is work in progress. The instructions will be written for the Squeak 5.2 release.
How I Made a Maze Constructor
I started out with thinking about a simple algorithm for constructing mazes:
I have a rectangular area (playfield) with a dot on it which may move like a turtle.
1. Move forward a random direction.
2. Check: Is area under empty ?
3. Yes: Draw a line to here and start over with step 1.
4. No: Move back and start over with step 1.
I opened the 'objects' flap and brought out a playfield as the world for my maze.
I adjusted the size of the greenish playfield to have the size I want it to have,
Then I choose an ellipse for the turtle and set the dimensions in a way that it appears as a circle.
I opened a viewer on the ellipse and added a new script and named it moveAndTest.
The ellipse has to choose a direction in a random order, but keep the direction in square angles:
How to get function tiles in Etoys (e.g. random function)
Get the random number tile by clicking on the icon right of the ticking/paused indicator.
And the distance to move:
The ellipse now will move forward in a random direction in steps of distance 20.
Then there was time to do some testing:
First if the ellipse obtrudes, if it goes out of it's playfield,
that is not wanted.
This moves the ellipse back and starts the search for a random direction again.
... more explanations and instructions upcoming .....
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