Using the Screen
The way we draw shapes in SeeLogo is by using an imaginary creature that we call "The Turtle," which has a triangular shape and appears in the center of the screen when SeeLogo is started. By controlling the turtle, pictures can be drawn. There are various ways one can control the turtle:
By issuing commands in the command line and pressing the <enter> key
By using the mouse and various tools
By typing commands directly in the editor and then clicking the Redraw Button or pressing F9 (on a PC)
Activity 1:
In the command line, type: CIRCLE 120 and press the <enter> key. A circle will appear.
Look at the editor (the window below the command line) and notice that the same command appears there.
On the next line in the editor, type CIRCLE 100. Click Redraw. Now two circles appear (you can see that you can also type commands in the editor and execute them).
Activity 2:
Choose a name for a new picture. Type NEW plus the new name in the command line and press <enter>. For example "NEW house " (this will create a new program and the name will appear in the "names" window).
Use the mouse to draw lines on the screen. You can select different colors and draw various shapes with them.
Type "NEW p2" (or another name) and select other shapes. Just play around! The first 12 tools are used to draw shapes, and they appear at the upper part of the tool box. The rest of the tools are used to transform shapes.
Activity 3:
Choose a name for a new picture. Type NEW plus the new name in the command line and press <enter>
Type CIRCLE 40 (The number 40 represents the diameter of the circle)
Type GROWBY 20% 5 IT
Then click the Undock button that is on the upper right hand corner above the drawing screen and you can see a bigger screen. Press F9 to redraw. Then you can click the Dock button on the upper right hand corner above the drawing screen to go back to the original picture.
Summary: In this lesson you learned:
To type commands in the Command Line and see the results translated to a picture and to the Editor
To change commands in the editor and see the effect on the graphics screen
To play with the graphics tool. Detailed explanations will come later
To create new programs using the NEW command
To Undock and Dock a screen