Difference between revisions of "Activities/Turtle Art/Getting started"
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===Displaying things=== | ===Displaying things=== | ||
<gallery> | <gallery> | ||
| − | File:Hello world.jpg|Using 'print' | + | File:Hello world.jpg|Using 'print' |
File:Printnumber.jpg|'print' and 'show' can display numbers including results of calculations | File:Printnumber.jpg|'print' and 'show' can display numbers including results of calculations | ||
File:Stringsandnumbers.jpg|'print' with text and numbers | File:Stringsandnumbers.jpg|'print' with text and numbers | ||
Revision as of 21:48, 28 February 2011
Getting Started
Start by clicking on (or dragging) blocks from the Turtle palette. Use multiple blocks to create drawings; as the turtle moves under your control, colorful lines are drawn.
You add blocks to your program by clicking on or dragging them from the palette to the main area. You can delete a block by dragging it back onto the palette. Click anywhere on a "stack" of blocks to start executing that stack or by clicking in the Rabbit (fast) , Turtle (slow) or Bug (debug) buttons 
on the Project Toolbar.
The basics
Basic turtle graphics: 'forward', 'back', 'arc', and 'right' blocks
Pen attributes: 'set pen color' block
'set pen size' block
Pen up and pen down
Drawing shapes
Use the repeat block to draw shapes
This can be generalised to n sided polygons, store n in Box1
Use 'start fill' and 'end fill' to draw filled shapes
Boxes, Stacks and the Heap
(aka variables, subroutines and the stack)
named variables:'store in' block
Named 'stacks' of blocks can be reused
Collapse a 'stack' of blocks to save space
Displaying things
Using 'print'
'print' and 'show' can display numbers including results of calculations
'print' with text and numbers
'show' block used for text
'show' an image, (movies, audio)
'show' the camera output
Mathematics
logical operations: 'if' block
