My zoom image canvas code get bad arguments but i dont know why?

[CanalDTodoUnPoco_PC]

there is my code and my aia. i follow the instructions for zoom a image using canvas but
i get this

zoom.aia (43.9 KB)

[ABG]

BackgroundImage is the name of a file.
ScreenWidth * 2 is a number.

What does it mean to compare a file name to a number?

[CanalDTodoUnPoco_PC]

because i am using this guide

[ABG]

So to your eyes .BackgroundImage and .Width are the same thing?

P.S. We code with our eyes, too.

Compare:

P.S. Look at the places I circled in black.

How to Read and Understand a Runtime Error Message

We get lots of posts with run time error messages that look like [image] How can we extract useful information from error messages like that? Here's how: [Sample error message annotated] The name of the block is in the error message, between "The operation" and "cannot". In this case, the operation is "select list item". To proceed further, we need to look at a sample of that type of block, to see what it wants as arguments (the stuff that goes into its sockets.) This sample was pulled o…

[TIMAI2]

Some other methods

Custom Map, or Canvas? (making a Kriegspiel board game clone)

Here is a scroll and zoom example i made a few years ago. May give you some ideas.... (you drag the image with your finger, but you could use sliders/buttons, or another canvas!) scrollzoomimageincanvasscrollapp2.aia (141.4 KB) [image]

Custom Map, or Canvas? (making a Kriegspiel board game clone)

https://groups.google.com/g/app-inventor-developers-library/c/hkt7gyMO2nU and on the same subject https://appinventor-mit-edu.ezproxy.canberra.edu.au/explore/blogs/karen/2018/03

[CanalDTodoUnPoco_PC]

the example that give you about the links me have a dark image, the image dont load and i dont know why.i am only compile the apk but the image dont load. i am using galaxy a30s

[CanalDTodoUnPoco_PC]

i am change the blocks but the dragg doesnt work when i try slide using the finger. why? someone can help my error?

[Lito]

Maybe changing this by 'ejex' work well...

@>-->---

[CanalDTodoUnPoco_PC]

i change this but i cant get to move inside the space like a zoom

[HarshVardhanSolanki]

@ABG

P.S. We code with our eyes, too.

Not every green block is the block you seen.

[ABG]

Yes, I stopped looking at the first error.

[Lito]

I could not understand in which context that 'global index' could be less than zero...

¯ _(ツ)_/¯

@>-->---

[HarshVardhanSolanki]

Could you please provide me your apk file to test what is the real issue and when it occurs?

[CanalDTodoUnPoco_PC]

i need to zoom the backgroundimage of canvas. because i need to capture the zoom image but i dont know why dont work.