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Lab 2: Build Your Own Blocks (BYOB), Variables & Loops

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Lab 2: Build Your Own Blocks (BYOB), Variables & Loops. Jan. 13 – Jan. 15. BYOB…Draw square. Review Created our own motion block called “draw square” Used script to create a square with side lengths of 100 steps. Improving Draw square.

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byob draw square
BYOB…Draw square
  • Review
  • Created our own motion block called “draw square”
  • Used script to create a square with side lengths of 100 steps
improving draw square
Improving Draw square
  • Created a motion block, that allows us to move a sprite in a 100 step square whenever this block is applied to the script
  • We will edit the block to accept an argument (or input), which tells it the length of the square it has to draw.
  • Right-click on the block and open block editor.
improving draw square1
Improving Draw Square
  • Notice the “+” surrounding the draw square text on the block
  • Allows us to enter

another component

  • Create size input and

copy by dragging

draw triangle
Draw Triangle
  • Using knowledge of “draw square” motion block…create a “draw triangle”
    • How many repeats?
    • What angle?
  • Edit block to have size argument
draw shape
Draw Shape
  • Create a motion block that will draw any shape
  • Name block “draw shape sides size”
  • Have two arguments
    • Side
    • Size
  • Use operator block for angle
max block
Max Block
  • Reporter block – reports a value
  • We will make a block called “max” that takes two numbers as input and reports the bigger value (the maximum)
  • Notice the shape of this block, it has smooth edges and differs from the puzzle piece look of command blocks
max block1
Max Block
  • How could we compute the max of 3 values?
useful tips in snap
Useful tips in Snap
  • You can create inputs in blocks by clicking on the plus signs to add an input; however, you can also type the names of the input by incorporating a %.
  • The percent signs (%) indicate that the word should be an input.
  • Practice doing this both manually and with a %
predicates
Predicates
  • A predicate is a block that reports either true or false.
  • Notice the difference in shape of a predicate block, it is neither smooth or puzzle piece shaped, but has pointed sides.
  • Lets create our own predicate block, “Greater than or equal to”
review of variables
Review of Variables
  • Normal/Global Variables: Can be used anywhere and by any in block, script, and sprite
    • Ex. “score” variable
  • Sprite Specific Variables: Normal variables that are applied to sprites individually, not good for block use
  • Script Variables: For use inside a script
activity 2 brick wall
Activity 2: Brick Wall
  • In this activity you will draw this brick wall
  • See Moodle link for full description
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