Having a Image Sprite recognize different background colors

MIT App Inventor Help
1

I have a student that is creating a game where a random color generates at the bottom of the game and the user has a limited amount of time to move a ball within the canvas on top of that color based on the background image. If the user does this in time, they should receive a point.

The problem is that I can't help my student figure out how to have the ball recognize that it is on the correct color of the background image to give the user a point. Here is the file:

Color_Run.aia (44.9 KB)

I am new to teaching with App Inventor so I'm limited in knowledge on how to help my student. Any help you can offer will be greatly appreciated.

Josh

2

Create a Button1 to check color.

ball_1
ball_1890×372 29 KB

Read here about X Y in Ball component.
http://ai2.appinventor.mit.edu.ezproxy.canberra.edu.au/reference/components/animation.html#Ball

3

Thank you. Any suggestions on the event that can be used to have the user receive a point when the ball is placed over the correct color before the time runs out?

4

Your student might start here Programming Your App to Make Decisions

and Drawing and Animation components

He/she needs a variable to handle points; myPoints = myPoints + 1
and learn to use the Clock * [Clock] https://community-appinventor-mit-edu.ezproxy.canberra.edu.au/search?q=count%20down%20timer
(http://ai2.appinventor.mit.edu.ezproxy.canberra.edu.au/reference/components/sensors.html#Clock) to make a count down timer.

If the student posts the code tried, someone will provide specific advice.

5

Steve,

Below is a link to the original code.

Color_Run.aia (44.9 KB)

6

You might post the Blocks. Glad to look at them and provide advice.

Here is a detailed discussion about how to recognize different background colors Button placement(How to use Canvas screen colors to create a Q&A Quiz

7

Your game is almost over. The only thing missing was calling the color check routine. I invoked this routine after clicking the buttons. I also added a variable that will block adding multiple points in one field.
Color_Run (1).aia (46.2 KB)

8

Thank you! I think my student has it working now! Have a great weekend!