Draw with button, not canvas dragged

[Mike D'Amico]

Hi,

Is there anyway to draw on a canvas using the click of a button?  Specifically I was hoping to start in the middle, then each time a particular button is clicked the line increments a specific length in a particular direction, then each time it's clicked it adds that length to look like the line is getting longer.  I just thought of this, but similar to drawing with a turtle/arrow in Python (I don't know much about Python, just that I did an activity once where the turtle/arrow drew a line in different directions each time you gave it a command.

Thanks for any help

[Taifun]

yes of course you can call the canvas methods in a buton click event

see the documentaiton here http://ai2.appinventor.mit.edu/reference/components/animation.html#Canvas

you might want to try something and if you get stuck, then post a screenshot of your relevant blocks

A very good way to learn App Inventor is to read the free Inventor's Manual here in the AI2 free online eBook   http://www.appinventor.org/book2 ... the links are at the bottom of the Web page.  The book 'teaches' users how to program with AI2 blocks.

There is a free programming course here http://www.appinventor.org/content/CourseInABox/Intro  and the aia files for the projects in the book are here:  http://www.appinventor.org/bookFiles  

How to do a lot of basic things with App Inventor are described here:  http://www.appinventor.org/content/howDoYou/eventHandling  .

Also do the tutorials http://appinventor.mit.edu/explore/ai2/tutorials.html to learn the basics of App Inventor, then try something and follow the

 Top 5 Tips: How to learn  App Inventor

You will not find a tutorial, which does exactly what you are looking for. But doing the tutorials (not only reading a little bit) help you to understand, how things are working. This is important and this is the first step to do.

Taifun

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Trying to push the limits of App Inventor! Snippets and Tutorials from Pura Vida Apps by  Taifun.