Close Flag as Inappropriate. You have already flagged this document. Thank you, for helping us keep this platform clean. A step-by-step visual guide to creating your own projects using Scratch 3. Written for children ages with little to no coding experience, this straightforward visual guide uses fun graphics and easy-to-follow instructions to show young learners how to build their own computer projects using Scratch, a popular free programming language.
Report Close Quick Download Go to remote file. Documents can only be sent to your Kindle devices from e-mail accounts that you added to your Approved Personal Document E-mail List. Related articles. Share this article. Pages: 1 2. Click inside the blue circle to make it green. Instant player control Now add a score display and a script to make the Player sprite stick to the mouse-pointer just like in Star Hunter. Then put a check in the variable s box to show Score on the stage. Variable name: For all sprites New Variable Score For this sprite only Checking this box ensures that the score will appear on the stage.
Read it through and make sure you understand what it does. Run the script to check it works. The red and green circles won t do anything yet. You can do this through the magic of cloning. Before you create your clones, first get the Friends sprite moving randomly around the stage.
Add this script to make the circle bounce around the stage with a random change of direction every steps. We re all different! Picks random direction point in direction pick random to I m not! The Friends sprite moves steps in step jumps but it doesn t get stuck to the walls.
After steps, the forever loop goes back to the start. The sprite changes direction randomly and sets off again. Random direction changes happen every steps. A repeat loop does a similar job, but it only repeats the blocks inside a fixed number of times. This type of loop is sometimes called a for loop, because it repeats for a certain number of times. The example shown here repeats an action four times to draw a square.
After 4 repeats, the next block is run. These are the clones you need to catch to score points. You ll find it in the yellow Control section. This block will create a clone of the Friends sprite after each step movement. A new clone is created every steps. At each change of direction, the sprite leaves a copy of itself a clone.
The clones aren t just pictures they are fully working copies of the original sprite, and you can give them their own instructions New clones are controlled by a special script that starts with the block when I start as a clone.
Add the script below to the Friends sprite. The script tells each clone to move toward the Player sprite for steps, after which the clone is deleted and vanishes from the stage.
The clones move one step at a time. They move more slowly than the original Friends sprite, which moves in step jumps. Run the script and watch the green clones advance slowly toward the Player sprite. Don t worry they re the good guys! The instructions within the block are repeated times.
The clone moves slowly toward the Player sprite in 1-step jumps. The clone disappears after steps. If it is, the clone gets deleted.
Try running the project now the score should increase as you touch green circles, which instantly disappear with a pop. Clones are useful any time you want lots of copies of a sprite. Many programming languages let you make copies of things, but they are often called objects rather than clones. In Scratch, there are three orange blocks that control clones, all found in the Control section. The clone is identical to the sprite and appears in the same position and facing the same direction, so you won t be able to see it until it moves.
This block gets rid of the clone. All clones disappear from the stage when a project stops, leaving just the original sprite. Clones don t run the sprite s main script, but they can run all other scripts in the sprite s scripts area, such as scripts triggered by messages. You can do this by copying the scripts from the Friends sprite across to the Enemies sprite.
Drag the two scripts you made for the Friends sprite onto the Enemies sprite, one at a time. This makes copies of the scripts in the Enemies sprite. Sprites Player Friends when clicked Release the mouse when the mousepointer is over the red circle. The scripts you dragged and dropped will probably be on top of one another, because any copied script just appears at the top left of the scripts area. To rearrange them, right-click on the background and select clean up.
The clean up option reveals any hidden scripts. You really want to avoid those nasty red enemies! Load the cymbal sound into the Enemies sprite by selecting cymbal in the sound library.
Alter the script to play cymbal, not pop. You ll now hear which type of clone you ve touched. She may not be the best player, but she is the loudest! Check that you now have both red and green clones, and that touching a red clone takes 3 points off your score. You ve created two ever-expanding clone armies: one of friendly circles that help you win points, and one of evil circles that make you lose points.
Next you need to add the code that tells you if you ve won or lost the game. You can find this block in the green Operators section. They check your score. If the score is greater than 20, you win, and a thought bubble with the word Victory! If the score is less than 20, you lose, and the sprite thinks Defeat! Score 21 Score 21 LINGO Comparison operators Earlier we saw how you can use if then blocks to create true or false statements also known as Boolean expressions that lead to different outcomes.
For example, in Star Hunter, if touching cat then play sound fairydust makes a sound play only when the cat gets a star. We can do the same thing with numbers by using what are called comparison operators: if think Score Victory! When we add these to if then blocks, they create statements that are either true or false. In Circle Wars, the is more than operator tells you that you ve won the game when you score over Try to touch only the green circles.
Check that the game ends when the key scores are reached, and check that the Player sprite thinks Victory! You can reduce the score needed to win if you find it too difficult. But don t make the game too easy Circle Wars is meant to be a challenge! I am the champion! Adding a timer To add some competition to the game, you can include an on-screen timer that shows players how long they take to complete a game.
To show it on the stage, check the box next to the variable s block. Select the Player sprite. Click on Sensing in the blocks palette. Add reset timer to the Player s script, just before the forever loop. Go back to Data and drag a set Time to block to the script and add timer to it, making it the last instruction in the forever loop.
But the moment the player wins or loses, the time stops being updated the script is stopped and the total time it took to win or lose is shown. This block updates the Time display every time the loop repeats.
Create a special sprite that shows the instructions for Circle Wars when the game begins. Use black for the text. Choosing a light background color will make the text easier to read. Select Bitmap Mode and choose a color. Select the Fill with color tool and click on the drawing area to fill it with your chosen color.
Fill with color tool You may want to decorate your instructions with colored circles Now select black from the palette as the color for the text. Then choose the text tool and type out the instructions shown here. Text tool If the text doesn t fit, use the select tool to resize it by pulling the corner points in or out.
When you ve finished, click outside the box around the text to stop editing. Select tool You are the blue circle. Move using the mouse. Be quick! Try to touch the friendly green circles. Each one gives you 1 point. Avoid the enemy red circles. Each one you touch takes 3 points.
Score more than 20 to win. Score less than 20 and you lose. Press the space bar to start! At the moment, Circle Wars has no story. Can you make one up? It could be a battle in space, with a blue spaceship saving friendly green spaceships and trying to avoid being hit by the red enemy craft.
Let your imagination run riot! Including some of the story in your instructions will help make the game more interesting and exciting for the player.
Read it carefully. Can you see how it works? These blocks show the instructions in the center of the screen in front of other sprites.
This block hides the Instruction sprite when the player presses the space bar to start playing. This will hold back all the action until the space bar is pressed. Players will have plenty of time to read and understand the instructions, letting them start the game when they re ready. Now to personalize it and make it your own. Try these suggestions and your own ideas. Once you ve created something unique, why not share it on the Scratch projects website?
What s the story? Did you think of a story to explain what s going on in Circle Wars? Maybe it s the attack of the dragons, and the princess player has to eat cakes to survive? Add some scenery and music to the game to fit with that story. Experiment with different stories and looks. Find a balance Experiment with different speeds, or change how many points you win or lose for touching Friends and Enemies.
It s not difficult to make the game very hard or very easy, but can you find a balance to make it just the right level? The war s over! Add a broadcast message to reveal a Game over! You can change the text of the Game over! Slow down, blue! To make things tricky, change the blue circle s script so that it no longer sticks to the mouse pointer but chases slowly after it. You could also invent simple keyboard controls for the sprite. Tweak the timer The number in the timer flickers because it shows lots of decimal places.
To round the value so it shows only whole seconds, use the green round block near the bottom of the Operators section. Try adding a Best time for winning players, just as you added a High score in Cheese Chase.
That s their best time yet! Click on the Friends sprite. Add the set color effect to block from the Looks section to the sprite s clone script. Then drag pick random from Operators into the block s window and change the values to 30 and Do the same for the Enemies sprite. New clones will now have different colors! Green and blue circles are friends.
Orange, yellow, pink, and purple circles are enemies. Change the size Add the change size by block to the scripts of both the Friends and Enemies sprites to make each clone a random size. Alter the scoring so that the size of the circle you touch determines how many points you score.
You ll also need to change the totals needed to win or lose. Try more than 2, points for victory, and less than 2, for defeat. From green Operators section pick random 30 to 30 Change the values to 30 and PDF Drive investigated dozens of problems and listed the biggest global issues facing the world today.
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