Home
brought to you by
The Center for
Innovation in Engineering & Science Education
CIESE Staff
Ihor Charischak
icharisc@stevens.edu
Ange Pantazes
Apantazes@comcast.net
<>Sketchpad Example of Spinwheel with one animation
Sketchpad Example of Spinwheel - two animations
See Java version of
this Spinwheel
|
Activity 1: Animated Spinwheels*
I. Start with a new sketch.
Go to the File menu and choose New Sketch.
Turn off automatic point labeling.
Go to the Display menu and choose Preferences. Make sure that Autoshow
points is not checked. If it is, click on the check to make it go away
Draw a triangle.
Use the line segment tool to draw a triangle.
Highlight the vertices of the triangle.
Choose the select button. Click on and highlight one of the vertices.
Hold the shift
key down and highlight the other two vertices so all three vertices are
highlighted.
Make a triangle interior.
With the three points highlighted, go to the construct menu and choose Triangle Interior.
Add color to your triangle.
At this time your triangle should be "shimmering". That means that it
is highlighted. Right click your mouse and choose a color. Click in any
white area to turn off the highlighting. You should see a colorful
triangle.
Make a point of rotation.
Double click on one of the vertices of the triangle. You should see an
exploding “doughnut” effect. This means your vertex is now a point of
rotation.
Highlight the triangle interior.
With the select (arrow) button click on the colored region inside your triangle. It should now be "shimmering."
Rotate the triangle interior.
Go to the transform menu and choose rotate.
Enter 60 degrees.
Click OK.
Rotate the triangle interior again.
Go back and choose rotate again. Continue until you have “completed”
the spinwheel.
Change the colors of your triangles so that they are all different.
Test your spinwheel.
Click on any vertex and drag it around.
You should notice that all the shapes change.
II. Animate the spinwheel.
Draw a circle anywhere on your sketch.
Choose (highlight) a vertex of one of your triangles.
Hold the shift key down and highlight the circle. (You will have a
point and a path highlighted.)
Make an animation button.
Go to the Edit menu and choose the action button followed by animation.
Click on animate and you will see an animate button appear.
Do the animation.
Double click on the button and your animation should begin. Just click
anywhere on the screen to stop it.
Move the circle to another place. Make it smaller. Animate it again.
III. Some Questions (for you to answer and hand in to your teacher.)
1. Repeat this activity with other angles of rotation like 90, 120, 45,
and 30.
2. How many triangles does it take to complete the pinwheel if the
angle is 90? Why?
3. How many triangles does it take to complete the pinwheel if the
angle is 120? Why?
4. How many triangles does it take to complete the pinwheel if the
angle is 30? Why?
5. How many triangles does it take to complete the pinwheel if the
angle is 45? Why?
*These instructions are for version 3 of Sketchpad.
Copyright ©2003-6
Stevens
Institute of Technology,
Center for Improved
Engineering and Science Education,
All Rights Reserved
|