# Week 7 – 2016 – Explorers

Hello everyone.

Good to see everyone there on Saturday. We made a game t similar to on old game called Breakout.

We used a number of important coding concepts again this week, loops and decisions, Variables, broadcasting, etc.

During class, we didn’t have time to add the Lives and the Scores but we will continue with the game on Saturday.

Here is a link to the notes: cda-s6-week_07-breakout.pdf

Martha

# Explorers – Guessing Game

Hi everyone,

Good to see you back after the Halloween break.

Last Saturday we did a slightly different game to usual., There was no movement, no sensing when something happened. It was a Maths Game, a guessing game where the computer picks a random number and we had to guess the number.

We had to first make sure that a random number was picked using an Operator. Previously we have used a Variable to store a Score or Lives, but this time it was storing the random number and our guesses. Leaving them on screen as we were testing allowed us to understand more about the variable and what it does…it also made the testing a little easier.

Depending how any guesses we were given we repeated our code that number of times. As well as having to make decisions, i.e If_then, we also had to do a comparison before making the decision, to determine whether the guess was correct, too low or too high.

Some of you tried to add a timer and below is the code you will need if you didn’t get it to work. Take a look and add it to your own game/games.

Here is a link to last weeks notes. cda-s6-week_06-guessnumbers.pdf

See you next week!

Martha

# Explorers – Writing Commands to move sprites

Hi everyone,

We had a great crowd for our first session in our Explorers group. A big welcome to all our new Ninja’s and of course a special welcome back to our younger Ninja’s from last year, who are still with us.

We started today with our first game, as well as learning how to write commands to move our sprites, we took a brief look at the interface for Scratch 2.

We also took a first look at some fundamental concepts that we will be using throughout the year. Today we looked at the X and Y axis as well as the number of degrees in a circle.

Here are the presentation slides from the day, in PDF format: cda-s6-week_02-firstgame.pdf

I hope you all enjoyed today and hope to see you all again over the next couple of weeks!

Martha

# Scratch Beginners – Challenge 14 – Create a Piano

This week and part of last week we created a piano! The initial keyboard looked like this:

Each white and black key is a separate SPRITE. We began by drawing the white Middle C SPRITE which has two costumes. The first costume is white and the 2nd is a different colour (you choose) that flashes up when the SPRITE is CLICKED. This helps us to see which sprite is responding to the click.

# Beginner’s Scratch Challenge13 Easter Egg Painting Fun

This week I decided to make a game that gives the user choices. In order to decorate the egg, we give the user a few choices of colours and stickers to put on the Easter Egg and the user must click on the colour and sticker they like. We had to import sprite images from the internet, draw some of our own sprites from scratch and get sprites from the library. In the beginning after the green flag is clicked, I used the SAY block to give instructions that disappeared after 10 seconds.

We found an EGG, CHICK and BUNNY cartoon image on the internet and saved them to an image file on our desktop. I clicked the Add Sprite From File and found these images on my desktop and added them as new SPRITES. I then cleaned up the background of these sprites and made it transparent.

I drew a Spot SPRITE that I moved over on top of my egg to make it look good and I drew a Stripe SPRITE that roughly fell on top of the egg. You can move, shrink and grow each of these sprites so that they look OK on the egg. Now we have to get the BUTTON SPRITES on the side and the PAINT BALL SPRITES on the bottom. I started with one button that I found in the library and imported it. I changed it’s colour and wrote the word SPOTS on it in it’s costume editor using the T button. Here are what my sprites looked like:

The basic idea is that the BUTTON SPRITES (on the side) and the PAINT SPRITES (on the bottom) send a BROADCAST when CLICKED.Here is the script for the SPOTS BUTTON. That’s all there is.

And the STICKER SPRITES (the chick, bunny, spots and stripes) respond to each BUTTON broadcast by SHOWing or HIDEing. As each sticker called that one SHOWS and the others all HIDE. Here, this is the script for the SPOTS SPRITE. See how there is only one SHOW block under the WHEN I RECEIVE SPOTS sprite. This SPOTS SPRITE will only SHOW when the SPOTS BUTTON is clicked and sends out the broadcast SPOTS. When any other sticker button is pressed, it will hide.

The CHICK SPRITE will look exactly like this, except that the SHOW block will be under the WHEN I RECEIVE CHICK block! The PAINT BALL SPRITES do the exact same thing. They send out a broadcast, when clicked, that tells what colour the user picked. The SAY block helps let people know what to do.

The EGG must now react to the broadcast. We need to add a new the EGG SPRITE costume that matches the colour of the paint ball and rename the costume to orange. After I added the new costume, I put the WHEN I RECEIVE orange, CHANGE COSTUME TO ORANGE. The same happens for each other coloured PAINT BALL SPRITE.As you add buttons for other decorations on the egg, create or import the decoration and then script them as we have done above for the SPOTS. My final project is on the SCRATCH.MIT.EDU website. Search for projects for the username:cdathenry1516. I will share it so you can play, change the scripts or downlod it to your own computer. Have fun!

Julie

# Beginner’s Scratch Challenge 12 – Scrolling backgrounds

This week we are exploring a new concept of moving across a landscape like some of the treasure hunting type games such as Super Mario Brothers(SMB). Mario moves through a landscape of dangers and treasures looking for Princess Peach. He must avoid turtles and capture coins in order to keep going and not lose lives and start all over! Here are the notes in PDF:CDA-S5-Challenge_12-Scrolling backgrounds.

To understand the concept, you must understand that the STAGE is only 480 pixels wide (x goes from -240 to +240). No one SPRITE can be larger than the STAGE and we won’t be able to see a SPRITE that isn’t on the STAGE (ie. it’s x position is less than -240 or greater than +240). So we have to set up a series of SPRITES that extend past the stage and move them across the stage from left to right and under Mario’s feet to make it look like he is moving over the ground from right to left! Get it? It’s tough, but by the end of next week we will have a cool game!

1. We started by downloading an SMB cartoon character from the internet and saving it as an image file (either .png or .jpg) on our desktop or in our personal folder. We used this file to import a new sprite from FILE from the NEW SPRITE area. We then had to make any white background transparent and shrink Mario down to a reasonable size.

2. Next, we drew our own Ground SPRITE using the PAINT NEW SPRITE button. Important!! The sprite must be the full length of the stage!! See the 1st picture above for an example of what the ground sprite could look like. Mine looked like a brick wall, but yours can look like a stone wall or concrete one or some kind of footpath or road.

3. Now we must code our Ground SPRITE! We need to set it’s inital x position to zero and continuously move it in a direction for as long as we are pushing the right or left arrow buttons. To do this we need a new VARIABLE called XPOS. Go to DATA and create this new VARIABLE. See the image below on the bottom the instructions for setting up the initial position of the first ground SPRITE. After you create and code the first one, we can duplicate Ground SPRITE 1 and create Ground SPRITE 2. Be sure that Ground SPRITE 2 has an xpos set to 480 pixels more than Ground SPRITE 1.

4. Lastly, for this week, we need to get the Ground SPRITES to move!!

!!IMPORTANT! !Click the little i button on your Ground  SPRITE and see all the information about the SPRITE. Change the rotational direction of the Ground SPRITE to non-rotational. It is a button that looks like a dot.

We will code the Ground SPRITES to move to the left when we press the left arrow key and to the right when we press the right arrow key on our keyboards.  See below: Be careful to program the left arrow key to Point In Direction 90 and the right arrow key to Point In Direction -90. Notice both the Change xpos By commands have different numbers! (-5 and +5) Get these wrong and the SPRITE will not move in the correct direction. Once you have the 1st ground SPRITE working the way you like, duplicate it and all it’s coding. All you have to change in Ground SPRITE 2 is the xpos. It must be set to XPOS +480. If you duplicate that sprite, you must set it’s xpos to XPOS + 960 and so on and so on…

My original project is on the Scratch.MIT.edu website. You can log on with your own login name or use our one – CDATHENRY1516 and our password is CDATHENRY and play the game or download it to your computer for next week’s class. Next week will will be coding Mario to jump and to always return to the ground and giving our program a bit of perspective with a mountain in the background. I’ll try adding a coin or two for Mario to jump up and grab! See ye all next week!

Julie

# Scratch Beginners – Challenge 10 – Maths Game

Wow! We had an exceptional day at Coder Dojo on Saturday! We did a huge amount of work developing a maths game in Beginner’s Scratch. My finished project is on the SCRATCH.MIT.EDU website under the user: CDATHENRY1516. Check it out and upload your final version!

1. the player picks a level of difficulty and the computer chooses 2 random numbers to add (subtract or multiply- whichever you choose!) together and show the numbers to the player. Fr this we needed 2 SPRITES and 4 VARIABLES called SCORE, LEVEL, NUMBER1 and NUMBER2 as well as 2 BACKDROPS.
2. The player then has to enter an answer to the equation and the computer tells them whether they are wrong or right.
3. We repeated the ask/answer questions 5 or 10 times. Can you figure out where the REPEAT loop fits?
4. We also had a second sprite who reacted positively to correct answers BROADCAST and negatively to wrong answers BROADCAST. You can use whatever sprites you like and change their look whatever way you like. One coder added a puppy as their second and had him bark whenever an answer was correct.
5. After all the questions were asked we had the 1st Sprite SAY – Game Over! and BROADCAST Game over so that the backdrop changed and music played. There are two ways to change the backdrop- see below! Can you improve our game??! Can you figure out how to subtract or multiply instead of add? Can you get the computer to add three numbers together or give the user 3 level options like: easy, medium or hard? The notes for the Maths Game are here: CDA-S5-Challenge_10-MathsGame-simple addition. Happy Coding! Julie

# Beginner’s Scratch Challenge 9 – Storytelling

We had a great day in Scratch Beginners on Saturday! We created a project in which the Sprites all communicated through the use of broadcasts. Each broadcast caused a reaction in the other parts of the program such as the other sprites and even the stage. To begin, we all added two sprites from the library and two backdrops from the backdrop library to the stage. My sprites came with several costumes already supplied, but you can use whatever costumes you like.

Next, each coder had to decide on a story, conversation or a joke to have one sprite tell the other. After that we placed each character apart on the screen by using the GO TO: command and then had then move together using the GLIDE command. Each part of the conversation is shown on screen with the SAY FOR 2 SECONDS command after which the same words are broadcast to the whole program using the BROADCAST command. The second sprite responds to the first Sprite’s broadcast by SAYing his part of the joke and then broadcasting the same words. This goes back and forth until the story is finished. Keep trying out your scripting by pressing the GREEN FLAG and seeing how it is working.

At the very end, I have the 2nd Sprite send out a final broadcast which causes the backdrop to change and music to play while both Sprites simultaneously do a dance! I just threw that in for fun and to show that BROADCASTS can cause any part of the program to switch on or off. Here is the slide show if it helps a bit more: CDA-S5-Challenge_09-Storytelling. Also, I put my program up on the SCRATCH.MIT.EDU website for you to play with. Search for projects made by cdathenry1516. This project is called –JulieKnockKnockJoke23-01.

Hope to see you all next week when we work on a guessing a number game which requires input from the user to guess the number the computer has picked!

Julie

# Beginners Scratch – How to make an animated Christmas Scene

Because our last lesson on animation was cancelled, I thought I’d post a lesson online that the kids could access over the Christmas holidays. This Scratch project(Julie’s Christmas Scene) is on the Scratch.MIT.edu website user:cdathenry1516, pw:cdathenry if you want to download it to your computer.

I searched the internet for Christmas Cartoon Images and saved a few to my computer:

Once I had all the images I wanted for Sprites, I opened SCRATCH and imported the Sprites From File but I noticed that each Sprite had a white background that blocked my nice backdrop. I decided to delete the background from each sprite.

I did this for all my sprites. Next I decided to make the dog wag is tail by

1. Duplicating the doggie’s costume,
2. using the select tool to select just his tail and then rotating the tail with the little button at the very top of the selection rectangle.

I did the same with Santa’s arm and his shoes. I just rotated them a bit in each costume, back and forth.

For the lights on one of the christmas trees, I just

1. duplicated the tree costume 3 times,
2. poured different colours into the round decorations in each costume.

Lastly, I scripted each of the Sprites like this:

That last script is for the doggie! You can script your Sprites in any way you would like. Can you put in a snowman and make him dance about? or bounce around. Can you have presents dropping from the sky like my snowflakes??

Christmas Pizza Party next week!!! Don’t forget to wear a santa hat and decorations! Bring your favourite scratch project and we’ll show the rest of the Dojo!

Julie

# Scratch Beginners – Week 8- Stop Motion Videos

Last Saturday, we had a fantastic time creating very simple stop motion videos in scratch by taking pictures of small figurines in sequence and then uploading the pictures from cameras and phones to the computer. We then started Scratch and added the very first picture as a SPRITE from a file. All the subsequent pictures were then added as new costumes to this sprite!

We did have to do a very simple code for the sprite – when the GREEN FLAG is pressed the sprite FOREVER uses the NEXT COSTUME command and WAITS .1 seconds. The computer then moves from the first costume down to the last, very quickly, but not so quickly that we can’t see it happen! The result looks like we have taken a video. Check out the scratch.mit.edu website for the demo that I used – Julie Animation. Search the site for cdathenry1516 games.

Next week, we will take a look at Paint.net,which is a drawing program. I will quickly go through the menus but the best way to learn a program like this is to use it and experiment with it. We will use it to try to delete the backdrop from some of our pictures that were taken last week to see if we can make it transparent. When we do, we will be able to see our own backdrops in behind our characters.