[{"id":3366,"name":"5.Helloblock basic operation","moduletypeid":602,"content":"

6.1 <\/span><\/strong>Classification of building blocks<\/span><\/strong><\/h3>

Color Classification<\/span> <\/span><\/p>

On the left side of the programming interface, we have distinguished functions by colors. The color of the corresponding function of the building blocks in the expansion pack is convenient for us to quickly identify the role of the current building blocks when writing programs<\/span>.<\/span><\/p>

\"image.png\"\/ <\/span><\/p>

Shape<\/span> C<\/span>lassification<\/span><\/p>

1. <\/span>In the scratch<\/span> programming<\/span>, all the program blocks are also distinguished by their shapes, which are “bump shape”, “ellipse shape” and “diamond shape”.<\/span><\/p>

\"image.png\"\/ <\/span>\"image.png\"\/ <\/span>\"image.png\"\/<\/p>

2. <\/span>B<\/span>ump-shape blocks are the most basic blocks<\/span> <\/span>in scratch<\/span> programming<\/span>. They are generally the most commonly used functions. Execute from top to bottom in order.<\/span><\/p>

\"image.png\"\/ <\/span><\/p>

Scratch will execute the spliced blocks in order from top to bottom<\/span><\/p>

3. <\/span>E<\/span>llipse<\/span>-<\/span>shape<\/span> <\/span>b<\/span>lock <\/span>are used to store content in scratch<\/span> programming<\/span>, <\/span>which <\/span>are variables usually and are used as parameters. The elliptical b<\/span>lock<\/span> we can directly find from the b<\/span>lock<\/span>s library represent the specific attributes of a character<\/span> and stores corresponding digital or text information.<\/span><\/p>

\"image.png\" <\/span><\/p>

Record the results of the operation<\/span><\/p>

\"image.png\"\/ <\/span><\/p>

Record analog value of potentiometer module<\/span><\/p>

4. <\/span>D<\/span>iamond<\/span>-<\/span>shape building blocks are used to set conditions in the scratch. When we need a program that is more intelligent and able to distinguish different responses in different situations, then we need to use the diamond-shape conditional blocks to help the computer distinguish situation.<\/span><\/p>

\"image.png\"\/ <\/span><\/p>

Whether both conditions are met at the same time<\/span><\/p>

\"image.png\"\/ <\/span><\/p>

when key module is pressed<\/span>, return True<\/span><\/p>

There are only two states of conditional building blocks, <\/span>T<\/span>rue and <\/span>F<\/span>alse<\/span>. Return<\/span> <\/span>T<\/span>rue, which means that the content of the condition is <\/span>met<\/span>. <\/span>Return <\/span>False is false, which means that the condition is not met.<\/span><\/p>

6.2<\/span><\/strong> <\/span><\/strong>Basic operations<\/span><\/strong><\/h3>

1.<\/span> <\/span>Drag the blocks to the script area (<\/span>press <\/span>the left button <\/span>of <\/span>mouse and drag out)<\/span>.<\/span><\/p>

\"image.png\" <\/span><\/p>

2. <\/span>Change the parameters (click the command parameter with the left button<\/span> of <\/span>mouse, and enter new data with the keyboard)<\/span><\/p>

\"image.png\" <\/span><\/p>

3. <\/span>Stacking blocks (<\/span>D<\/span>rag below the previous block, two blocks will be automatically absorbed)<\/span><\/p>

\"image.png\" <\/span><\/p>

4. <\/span>D<\/span>elete blocks (<\/span>Press<\/span> left button <\/span>of <\/span>mouse and drag the entire block to the block area or <\/span>click <\/span>right button <\/span>of <\/span>mouse and select <\/span>“<\/span>D<\/span>elet<\/span>e<\/span>”<\/span>)<\/span><\/p>

\"image.png\" <\/span><\/p>

\"image.png\" <\/span><\/p>

5. <\/span>C<\/span>opy blocks (<\/span>L<\/span>eft<\/span> button of mouse <\/span>click on the building block and copy it with the Ctrl + C, Ctrl + V<\/span> of <\/span>keyboard, or <\/span>right button of mouse <\/span>click on the building block and select <\/span>“<\/span>Duplicate<\/span>”<\/span>)<\/span><\/p>

\"image.png\" <\/span><\/p>

6. <\/span>A<\/span>dd comments (<\/span>Right button of mouse <\/span>click on the building block and select<\/span> <\/span>“<\/span>A<\/span>dd comment<\/span>”<\/span>)<\/span><\/p>

\"image.png\" <\/span><\/p>

A text box <\/span>will <\/span>appears to the right <\/span>side <\/span>of the block, and the size <\/span>of <\/span>text box is adjustable.<\/span><\/p>

\"image.png\"<\/p>

Right button of mouse <\/span>click<\/span> on the block where the comment has been added, and you can select <\/span>“<\/span>Remove comment<\/span>”<\/span>.<\/span><\/p>

\"image.png\" <\/span><\/p>

Tips<\/span><\/p>

1. <\/span>If there are multiple building blocks superimposed at the same time, clicking the top building block to move will move the entire building block combination, and clicking the bottom building block to move only moves the bottom building block. <\/span>In<\/span> generally<\/span>, modify or delete the building block, you can drag the building block from bottom to top<\/span>. Or first drag out the combination of the blocks below the blocks that need to be modified to modify or delete them individually.<\/span><\/p>

2. <\/span>If you need to use building blocks with the same parameters multiple times, you can modify the parameters in the building block area before using them, instead of modifying the parameters each time.<\/span><\/p>

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