#Audio blocks week rial code#
Notice that there’s a little arrow at the bottom right of this block, indicating that the code inside will be repeated.We can also use the “repeat” block to run some blocks of code a specific number of times:.A “forever” loop, one that runs over and over again until the end of the program, is also called an infinite loop.By adding a “forever” block and placing our condition inside it, we can ask that question over and over again, and play a sound whenever our mouse pointer is too close:.It turns out that our stack of blocks is running just once, and as soon as we click the green flag, it asks the question and does nothing since our mouse pointer is far away from the cat. But when we run our program, nothing happens, even as we move our mouse pointer towards the cat.Note that we can find the “distance to” block in the Sensing category of blocks.If it’s less than a value of 100, our cat will play a sound. We can add a condition that checks for the distance to the mouse pointer.Now, let’s tell our cat to play a “meow” sound when our mouse gets too close:.We’ll remove our backdrop and fish, and add back the cat for Pet the Cat.With these blocks, we can add music to our programs that play over and over, giving us a sense that something is always happening.Our fish will follow the mouse pointer, and the backdrop will continuously play the wave sound. Now, when we click the green flag to run our program, we’ll have multiple “forever” loops running.Now, our backdrop will play the wave sound over and over again.Then, we can use the dropdown in the “play sound” block to select “Ocean Wave”. At first, the “play sound” block only has a “pop” sound, so we’ll use the Sounds tab to add the “Ocean Wave” sound to our backdrop.We can click on the backdrop in the Stage panel, and drag in these blocks: We can use this for our backdrop, too.We can make the fish move 5 steps each time as well:.By using the “forever” block, after we click the green flag, the fish will always point itself towards the mouse, over and over again.We’ll use the “Underwater 1” backdrop with our fish in Swimming Fish, and have it point towards the mouse cursor:.And it will repeat all of these blocks over and over again, until we press the stop sign. Now, our cat will move, bouncing if it’s at the edge, changing to the next costume, and then wait just a fraction of a second.Our cat seems to be moving a bit too fast, so we’ll slow down its movement:.So we can use a “next costume” block to alternate between the two: It turns out that our cat has two costumes, with its legs in slightly different positions.The legs of our cat aren’t moving, though, and it turns out we can make an animation, with images moving quickly enough that it gives the illusion of movement.Now, our cat is upside-down when it turns around at the edge, but we can change the rotation style by clicking on the Direction dial in the Sprite panel, and selecting the second option:.We’ll add another block that will tell our cat to bounce, or turn around, if it reaches the edge:.We can click the stop sign at the top of the stage, next to the green flag, and drag the cat back to the left side of the stage.Now, our cat will move until it reaches the edge, where it can’t move any further.We’ll use the “forever” block in the Control section of blocks, to make our cat move over and over:.We’ll start with a Walking Cat example with our cat moving 10 steps when the green flag is clicked:.
Now, we’ll tell our programs to loop, or repeat some blocks multiple times.But every time we ran our code, whether we pressed the green flag or pressed a key or clicked, each script could only run one time, from top to bottom.Last time, we combined blocks that were functions, values, and conditions to make our Scratch programs ask questions and then make decisions based on the answers to those questions.GitHub Instagram LinkedIn Reddit Threads Twitter CS50’s Introduction to Programming with Scratchīrian J.
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