Creating a program to make a shape Open the chrome browser Search for Blockly Turtle

Drawing shapes using a repeat loop Task Copy this script change the:

Repeat to 3

and the

Turn to 120

What happens?

Creating a stepping loop using the Variable i Variable i Step Upper limit (end) The VARIABLE i is a value that changes each time the loop is executed (run) A common mistake when people learn stepping loops it to misread i as a 1.

You can use any letter you like Task. Copy this script. Lets change the variable to J change the upper limit to 8 and step 2.

What happens?

https://blockly-demo.appspot.com/static/apps/turtle/index.html#cbzn2z

Using a procedure AKA subroutine

• • Procedures are used to complete distinct (separate) tasks To run a procedure you need to use a call or execute command.

This is the execute call command There are many ways to solve problems

Using a procedure inside another Procedure (Nesting) Use the DrawSquare procedure as before.

We are going to make a pattern Using the DrawSquare routine to draw petals of a flower.

Create a procedure called FlowerPattern This new procedure must Repeat the DrawSquare routine 36 times Each petal must rotate by 10 degrees https://blockly-demo.appspot.com/static/apps/turtle/index.html#wcysxu

Improving our program

Using random to select line colours What happens if I move the colour script here?

What happens if I put this colour script here?

OK but Squares are boring!

We can draw any shape if we know the

Number of sides

and

The interior angles

Look at this site • You can see that there is a relationship between the number of sides and the internal angles.

Using a rule

The inside angle of any shape is related to the number of sides. E.g. 4 sides = 90 degrees 360 degrees divided by the No of Sides of any shape Or to put it another way 360/the number of sides We can create a variable for the number of sides we want.

Create a variable NumberOfSides Create a variable InternalAngle Set NumberOfSides to 4 It would be useful to define the SideLength also create a variable to store this. Make the

SideLength=30

Using a mathematical rule in a Variable

Use variables in your DrawShape routine This now DrawShape execute call will run the procedure if it is placed on the stage.

https://blockly-demo.appspot.com/static/apps/turtle/index.html#j852aj

https://blockly-demo.appspot.com/static/apps/turtle/index.html#o3gvhh Create a procedure called RunShapeArt Create a loop to create rotated repetitions of the shape.

This is similar to the flower loop that you’ve already practised.

Using Blockly Minecraft