Drawing

Introduction

The VR Robot uses a pen to draw on a playground as it moves. The robot’s pen can change width, color, and fill enclosed area.

Below is a list of all available blocks:

• move pen – Raise or lower the robot’s pen.

• set pen to width – Set the width of the robot’s pen.

• set pen to color – Set the color of the robot’s pen from a list.

• set pen color – Set the color of the robot’s pen with red, green, and blue values.

• fill area – Fill a playground or an enclosed area with a specified color.

move pen

The move pen block raises or lowers the robot’s pen, allowing it to start or stop drawing.

    move pen [down v]

Parameters	Description
state	The state of the robot’s pen: down up

Example

  when started :: hat events
  [Draw a square.]
  move pen [down v]
  repeat (4)
    drive [forward v] for [150] [mm v] ▶
    turn [right v] for [90] degrees ▶

set pen to width

The set pen to width block sets how thick the drawn lines from the pen appear.

    set pen to width [thin v]

Parameters	Description
width	The width of the robot’s pen: extra thin thin (default) medium wide extra wide

Example

  when started :: hat events
  [Draw an extra wide square.]
  set pen to width [extra wide v]
  move pen [down v]
  repeat (4)
    drive [forward v] for [150] [mm v] ▶
    turn [right v] for [90] degrees ▶

set pen to color

The set pen to color block sets the color of the pen from a preset list.

    set pen to color [black v]

Parameters	Description
color	The color of the robot’s pen: black red green blue

Example

  when started :: hat events
  [Draw a blue square.]
  set pen to color [blue v]
  move pen [down v]
  repeat (4)
    drive [forward v] for [150] [mm v] ▶
    turn [right v] for [90] degrees ▶

set pen color

The set pen color block sets the color of the pen by manually providing red, green, blue, and opacity values. Adjust the different values by using the sliders that appear when clicking the color in the set pen color block.

    set pen color ( ::#000000)

Parameters	Description
red	The red value of the color from 0 to 255.
green	The green value of the color from 0 to 255.
blue	The blue value of the color from 0 to 255.
opacity	How transparent the color is as a percentage from 0 to 100.

Example

  when started :: hat events
  [Draw a pink square.]
  set pen color ( ::#D900D9)
  move pen [down v]
  repeat (4)
    drive [forward v] for [150] [mm v] ▶
    turn [right v] for [90] degrees ▶

fill area

The fill area block fills a playground or enclosed area with a specified color by manually providing red, green, blue, and opacity values. Adjust the different values by using the sliders that appear when clicking the color in the fill area block.

    fill area with color ( ::#000000)

Parameters	Description
red	The red value of the color from 0 to 255.
green	The green value of the color from 0 to 255.
blue	The blue value of the color from 0 to 255.
opacity	How transparent the color is as a percentage from 0 to 100.

Example

  when started :: hat events
  [Fill the playground with pink.]
  move pen [down v]
  fill area with color ( ::#D900D9)