Spinning Stars - ALICE Program

Spinning Stars

This exercise provides a world in which to explore using world-level functions to control

the execution of a loop. A knight has been thrown from his horse and stars are spinning

above him. We want to allow the user to control how the stars start and stop

spinning by moving the mouse cursor near the left or top edge of the window. While the

mouse is near the top or left edge of the window, the stars will start and continue spinning.

However, when the mouse is moved back towards the center of the world, the stars

should stop spinning. 

 To create this world, add a horse, a knight (both from Medieval), and a seeingStars

object (from Special Effects). Create a new method named spin  for the seeingStars

object. A “spin” is 2 revolutions, turning either left or right. In the spin  method,

the stars should spin left about half the time and spin right the other half. Create a

world-level function named nearTheEdge  that returns true  if the mouse is within

1 meter of the top or the left edge of the screen. Then, write a world-level method

named outOfBounds  that uses a while  loop to spin the stars as long as the mouse is near

the top or left edge of the screen. Use a While the world is running  event to call the

outOfBounds  method.

Hint: The world has functions that return the distance of the mouse from top edge and

from the left edge of the screen. Also, the world has a random probability function that

can be used to choose whether the stars turn right or left.

Solution:

The user moves his mouse near the left edge or top edge, the stars start spinning. When the user brings the mouse back to the center, the stars stop spinning. Similarly, if the user moves his mouse near the right edge or the bottom edge, the stars do not spin.

See the attached video created using Alice 2.4 for this program

This video is exported from Alice 2.4 from the actual source code of this program.

Contact me @ allassignmenthelp@gmail.com for the comprehensive step-by-step guide on how to create this game in ALICE as well as the final source code. I can modify the program if you would need any changes.