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Face It

Face It Activity downloaded to the Art Canvas Plus Playground. The VR Robot has already drawn a polygonal shape around one of the cartoon faces on the playground.
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Create an algorithm to use [Drive for] and [Turn for] blocks and the VR Pen on the VR Robot to create a regular polygonal facial expression on the Art Canvas+ Playground.

  • Download the cartoon facial expressions image as a PNG file from this Google slideshow.
  • Select the Art Canvas+ Playground and upload the cartoon facial expressions image.
    • To learn more about uploading images to the Art Canvas+ Playground, see this article.
  • Design an algorithm to create a regular polygonal facial expression.
    • Use variables to store the number and length of sides for the polygon, and calculate the angle the robot needs to turn to draw the polygon.
    • Utilize the Pen on the VR Robot and use a loop to repeat the [Drive for] and [Turn for] commands for a set number of times to code the VR Robot to draw a regular polygon on the Canvas. Use the value of variables to determine the drive distance, the angle to turn, and the number of times to repeat.
    • Drive the VR Robot into the polygon and use the [Fill area with color] block to fill in the shape area with a specific color. 

Helpful Hints

  • Use the formula to calculate the angle the robot needs to turn to draw a polygon:
    • The angle to turn = 360 / the number of sides

  • Use the divide report block from the Operators category to express the formula to calculate the angle the robot needs to turn.

    VEXcode Divide block containing a Variable block, that all together reads '360 / numberOfSides'.

    • Matching Python command:

      360 / numberOfSides

  • Use the variable report block from the Variables category to get the value of the number of sides of the polygon to determine the number of times to repeat.

    Empty VEXcode Repeat block that reads 'repeat numberOfSides'.

    • Matching Python command:

      for repeat_count in range(numberOfSides):
	wait(5, MSEC)
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