Tutorial on Kangaroo visiting his animal friends - parameters, events.

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Presentation transcript:

Tutorial on Kangaroo visiting his animal friends - parameters, events

Start with new world Add a Kangaroo and several animals of different heights, spread around the world I picked bunny, cow, horse1, ladybug, tortoise, turtle – any animals will do

Problem The kangaroo wants to visit each animal where “visit” means: the kangaroo and the animal face each other, the kangaroo moves close in front of it, the kangaroo says “hi” and then the Kangaroo jumps over it. However, the kangaroo can only jump 1 meter high.

Parts of the Tutorial Part 1: Kangaroo visit each friend Part 2: Kangaroo either go around or jump over Part 3: Create an event to click on animal to visit

Part 1: Kangaroo visit Cow Create a “Kangaroo” method called visit

See the new Kangaroo visit method

Enter the following code For the third line drop the move forward first under “kangaroo”, “functions”, drag in “distance to” and drop over the number Then click on the last white arrow on the line to select “Math” and then the minus and 2 The kangaroo will stop two meters in front of the center of the cow…

Add the remaining code Change “when the world starts” to Kangaroo.visit and “Play”

How to visit any friend – Add a parameter named friendToVisit - type should be Object – click ok

Now click and drag friendToVisit on top of the four occurances of Cow Click and drag from here

Change “when the world starts” back to myFirstMethod Drag in visit for each friend and “Play”

Part 2: Going around or over friend Kangaroo can only jump 1 meter high If friend is shorter than 1 meter, it is ok to jump over If friend is 1 meter or taller, then go around them

First drag in an If/Else from the bottom of the window, placing after the “say”

Select “world”, “functions” and scroll to find math functions, then click and drag “a<b” selecting 1’s

Drag in “cow’s height” from the cow functions, then drop “friendToVisit” over cow

Move the kangaroo jump over code and put after the if. Then add code after the else to “go around”. Then Play

Part 3 – create an event to visit friend clicked on First, disable code in myFirstMethod

Create a new event When the mouse is clicked on something

Drag over the visit code and select “expressions”, “object under mouse cursor”

Here is the event. Now click “play” and click on different animals, but not the kangaroo…