Add blocks to control the Grow and Shrink Buttons - INTRO TO APP INVENTOR - AGTECH

1. Click "Grow" in the blocks section and drag and drop “when Glow.Click do” into the viewer
2. Click Image1 in the blocks section and drag “set Image1.Height to” into the viewer and place it inside of the “when Grow.Click do” block
3. Click "Math" in the blocks section and drag the addition formula into the viewer and drop it at the end of the “set Image1.Height to” block
4. Click "Image1" in the blocks section and drag “Image1.Height” into the first opening of the addition formula
5. Click "Math" in the blocks section and drag “0” into the second opening of the addition formula, then change this value to 10
6. Repeat steps 2 – 5 for the image width. Alternatively, right-click on “set Image1.Height to” and change “Height” to “Width” in both instances.
7. Repeat steps 1 – 6 for the Shrink button, this time using the subtraction formula.

STEM Connections
The code that you have just built will increase the height and width of your image, making the image larger, when you press the “Grow” button and decrease the height and width of the image, making it smaller, when you press the “Shrink” button.

At the Thinkabit Lab, we walk students slowly through each added block of code, especially at the beginning. Once they know where to find different blocks, we move faster.

Can’t find one of the blocks of code

1. Watch the video, pausing as needed to see where to find each block of code.
2. Sometimes you have to scroll up or down to find the blocks of code you need.

Found the block of code, but having trouble getting it to the right place.

1. Make sure you are clicking the block of code you want and drag it to the right place before un-clicking.
2. Using a mouse can be helpful when building block code as dragging and dropping using a trackpad could be complicated.