认识Scratch-ppt课件.ppt

1、1ppt课件舞台区2ppt课件我来试一试1-1 在舞台上移动鼠标，观察（x,y）坐标值的。 如果鼠标超出了舞台的边缘，数值发生什么变化？3ppt课件我来试一试1-24ppt课件舞台背景区-试一试 尝试使用图库新建一个背景 自己绘制一个背景 打开一个文件作为背景 利用摄像头拍一张图片作为背景5ppt课件角色区-试一试 尝试使用图库新建一个角色 自己绘制一个角色 打开一个文件作为角色 利用摄像头拍一张图片作为角色6ppt课件探索积木区 动作区 外观区 侦测区 声音区 事件区 控制区 画笔区7ppt课件外观颜色1-28ppt课件乒乓游戏 第一步：准备背景 第二步：加入乒乓和球板 第三步：让角色动起来

2、 乒乓球(角度方向，随机值（向下（-45,45）向上（135,225） 球板（跟随鼠标的x）9ppt课件10ppt课件What is Scratch? Scratch is a free programmable toolkit that enables kids to create their own games, animated stories, and interactive art and share their creations with one another over the Internet. 11ppt课件What is Scratch? Scratch builds o

3、n the long tradition of Logo and LEGO/Logo, but takes advantage of new computational ideas and capabilities to make it easier for kids to get started with programming (lowering the floor) and to extend the range of what kids can create and learn (raising the ceiling). 12ppt课件What is Scratch? The ult

4、imate goal is to help kids become fluent with digital media, empowering them to express themselves creatively and make connections to powerful ideas. 13ppt课件What is Scratch? Scratch is built on top of the Squeak environment developed by Alan Kay and colleagues.14ppt课件What is Scratch? Scratch is bein

5、g developed by the Lifelong Kindergarten research group at the MIT Media Lab, in collaboration with KIDS research group at the UCLA Graduate School of Education & Information Studies. 15ppt课件Lets Get Started! To Open Scratch, double-click on the Scratch (cat) icon or click on Scratch.exe16ppt课件Getti

6、ng Started With ScratchOnce youve opened Scratch, you should see this default screen:17ppt课件Watch a Quick Introduction to Scratch!18ppt课件Lets Look At Some Scratch Examples Go to Open Projects and choose the category Animation Look through them and see what you will be able to do in Scratch! (Some of

7、 these have sound. Please be considerate of your neighbors and turn the sound down on your computers! Ask your teacher to help you if you dont know how.)19ppt课件Choose Your Sprite! You will notice that the default sprite is an orange cat. (A sprite is a small graphic that can be moved independently a

8、round the screen, producing animated effects.) You can choose a different sprite to program from a library in Scratch, or you can draw your own! You will create your own sprite later.20ppt课件Choose Your Sprite! To choose a sprite from the Scratch library, click on the Folder with a Star icon. When yo

9、u hover your mouse over it, it will say “Choose new sprite from file”.21ppt课件Choose Your Sprite! Open the folders of the different categories of sprites. Choose one that youd like to experiment with by double clicking on it. You can have more than one sprite in your animation!22ppt课件Choose Your Spri

10、te!Once you have a sprite that youd like to program, you can delete the orange cat sprite by clicking the scissor icon and clicking on the cat! Make sure that you click on the arrow icon before you do anything else otherwise, youll delete something that you really wanted!You can also right click on

11、the icon to delete that sprite23ppt课件Resize Your Sprite! You can make your sprite larger or smaller by using the “grow sprite” or “shrink sprite” icons. You click on one of these icons, then click on your sprite until it is the size youd like.24ppt课件Choose Your Background! Right now, you have a plai

12、n, white background boring! You can also change your background by choosing one from the Scratch library or creating your own!25ppt课件Choose Your Background! Click on the Stage: Now, select the “Backgrounds” tab!26ppt课件Change Your Background! You can experiment with creating or importing your own bac

13、kground later, but, for right now choose one from the library by selecting Import.27ppt课件Change The Background! From this screen, you can choose one of the category folders, and select a background that you like by double clicking on it!28ppt课件Now, Were Ready to Program!Now, you should have a sprite

14、 and a background that youd like to workwith!29ppt课件Programming In Scratch! The first thing you need to do is to click on the sprite you want to program, and select the “Scripts” tab. Since your sprite is the only thing that can be animated, make sure you have it selected. The Scripts area is where

15、you “build” your program by using the programming blocks.30ppt课件Programming In Scratch! In the upper, left-hand corner of your Scratch window, you will see 8 buttons . Each of these buttons have programming blocks in those particular areas. We will first experiment with the Motion blocks. 31ppt课件Mot

16、ion! When you click on the motion button, you will see the programming blocks that can be used with your sprite. Lets all program our sprites with the same code first, and then youll be allowed to experiment on your own!32ppt课件Motion! Drag out the “move 10 steps” block. Change the “10” to “50” by cl

17、icking in the block and typing in 50. To see your sprite move 50 pixels to the right, double click on the block in the Script area. Cool, isnt it?!33ppt课件Motion You can also set the motion block to move a negative number of pixels by typing a negative number in the block. This will move your sprite

18、that number of pixels in the opposite direction.34ppt课件What Is A Pixel? Weve been talking about pixels what is a pixel? A pixel is one of the small units that make up an image on a computer or television screen. It is derived from the words picture and element to make pixel!35ppt课件The Scratch Stage

19、The Scratch stage is 480 pixels wide and 360 pixels high.-240240180-18036ppt课件More Motion! Now, add the “turn 15 degrees” block to the other block of code. When you see the white bar between the 2 blocks of code, you can release your mouse. That white bar means that the 2 blocks will “snap” onto the

20、 other block.37ppt课件More Motion! Again, you can change the number of degrees by double clicking in that area and typing in the number of degrees youd like your sprite to rotate. Double click on the blocks to see your sprite move and rotate!38ppt课件Experiment With Motion! Weve only used 2 of the block

21、s in the Motion category. For the next few minutes, I want you to experiment with all of the other blocks in the Motion category. If youd like to see what a block does, right click on the block and then click on help. You can delete code easily by just dragging it from the Script area! Have fun!39pp

22、t课件Control! The next category of programming buttons we will experiment with is the Control category. This is a very important category because it controls how many times an event happens, how long an event happens, or when an event happens.40ppt课件Control! The first block Id like us to use is the “w

23、hen flag clicked” block: Drag this block out, and snap it on top of the blocks you already have in your script.41ppt课件Control! Now, instead of having to double click on your block of code, you can just click on the flag icon to play your animation!Click here to start42ppt课件Presentation Mode When you

24、 click on the presentation mode button, your animation will fill the whole screen! To exit presentation mode, click the arrow in the top left of the screen, or just press the Esc key. 43ppt课件Back to Control! Other powerful blocks in the Control category are the blocks that handle conditional stateme

25、nts. Conditional statements are commonly called “if statements” or “if-else statements”.44ppt课件Conditional StatementsThis code means that if the user presses the Space key on the keyboard, the sprite will move 10 steps.45ppt课件Sensing! The conditional statements must be used along with the sensing bl

26、ocks. (Notice the shape of some of the sensing blocks. They are the ones that will fit inside the “condition” since they have 6 sides)46ppt课件Back to Control! For the next few minutes, experiment with the blocks in Motion, Control, and Sensing. Right click on a block and select help to get informatio

27、n about a block. When you get something cool, Id like to see it!47ppt课件Sound! Now, lets add some sound to our animation! There are many different ways to get sound in your animation. The first way were going to experiment with is by importing a sound from the Scratch sound library. 48ppt课件Importing

28、Sound From The Scratch Sound Library Click on the sprite you want to have sound. Click on the Sounds tab and select Import.49ppt课件Scratch Sound Library You will see different categories of sounds that you can use in your animation that are available for you in the Scratch library.50ppt课件Inserting So

29、und Once you find a sound that you like, select it and click on OK. You will see the sound you just selected show up under “New Sound”.51ppt课件Play Your Sound If you click on the “Play” button, you can preview your sound.52ppt课件Adding The Sound To Your Animation Now, youre ready to add the sound to y

30、our animation! Click on the Script tab. Select the sprite you want to have sound. Now select the Sound button.53ppt课件Adding Sound Now, select one of the blocks that says, “play sound” Select your sound from the drop-down menu by clicking on the triangle next to “pop”.54ppt课件Recording a Sound Click o

31、n the record button to record a sound Click on the red button to start recording Click on the square to stop You can rename the sound by typing over the name55ppt课件Incorporate Sound Into Your Animation!When I click the flag, my bee will move and buzz.56ppt课件Time To Play! For the next few minutes, ex

32、periment with Motion, Control, Sensing, and Sound! When you get something cool, let me see it!57ppt课件Using The Pen! When using the Pen tools, your sprite actually becomes your writing instrument! You can change the Pens color, its shade, and its size.58ppt课件Using the Pen! Your first Pen challenge is

33、 to write your initials using the Pen tools. It may sound easy, but, you have to remember to lift your pen when necessary and also to put it back down! 59ppt课件Pen Challenge #2 Great job with Pen Challenge #1! Your second Pen Challenge is to use the tools to create an interesting design. Remember tha

34、t you can change Pen color and shade!60ppt课件Numbers! There are many animation effects you can create using Numbers in Scratch. One effect is random movement of a sprite!61ppt课件Random Movement Remember that the Scratch animation area is 480 pixels wide and 360 pixels high. That means that the range o

35、n the horizontal axis is from -240 to 240. The range on the vertical axis is -180 to 180.62ppt课件Random Movement This is the block of code I would use if I wanted my sprite to randomly glide the entire horizontal and vertical distance of my Scratch animation area:63ppt课件Numbers! For the next few minu

36、tes, experiment with the tools in Motion, Control, Sensing, Sound, and Numbers. Click right on a block and select help to see what it does. When you get something cool, let me see it!64ppt课件Variables! Variables are used mainly in the development of games. Open some of the examples in Projects Games

37、to see how variables are used to keep score in a game.65ppt课件Time To Have Fun! Now its time for you to create your own original animations or games! Each table has a set of 12 laminated cards with different projects that you can try, to give you ideas for your own animation.66ppt课件Learn How To: Whil

38、e youre creating your own Scratch animation, I want you to discover how to: Create your own sprite; Create your own background;67ppt课件Last Slide! Remember to: Be appropriate; Be creative; Have fun! You will also be given a Scratch Help Guide, complete with screenshots to help you get started.68ppt课件