Difference between revisions of "Activities/Turtle Art/Getting started"

Revision as of 21:06, 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

More

'show' block used for text
multimedia: 'show' block used for image (movies, audio)
logical operations: 'if' block

@@ Line 22: / Line 22: @@
 File:Turtlefilledtriangle.jpg|Use 'start fill' and 'end fill' to draw filled shapes
 </gallery>
+===Boxes, Stacks and the Heap===
+(aka variables, subroutines and the stack)
+<gallery>
+File:TA-box-eample.png|named variables:'store in' block
+</gallery>
 ===More===
@@ Line 28: / Line 36: @@
 File:TA-image.png|multimedia: 'show' block used for image (movies, audio)
 File:TA-if.png|logical operations: 'if' block
-File:TA-box-eample.png|named variables:'store in' block
 </gallery>