RAND: Keep Map Marker in a Certain Area of Screen

[ericonline]

Hello,

I don't have much experience using the math functions within PowerApps. Looking for some guidance here. 

Scenario:

• Using PowerApps as a rapid, click-thru prototype creation tool
• Have a map image on the screen
• Have a map pin on the screen
• When user selects an item in a Gallery, I want the Map Pin to popup on the map, BUT ONLY WITHIN A CERTAIN AREA OF THE SCREEN

Questions:

• I can control the visibility of the Map Pin based on Gallery selection.
• But how do I easily assign some randomness to the Map Pin X and Y to give a feel of being dynamic?
• I don't want the map pin to show up in the middle of the Pacific for example 🙂

Specifics:

• Map image dims: X: 330, Y: 120, Width: 1000, Height: 550

Thanks for the insights!

[ericonline]

Hm... Thought this would work, but nope:

• OnSelect of the Gallery, 

Set(varRandX, Rand() * (1330 - 336));
Set(varRandY, Rand() * (850 - 140))

• X and Y of Map Pin Icon
  • varRandX, varRandY

[Pstork1]

Since this appears to be for some kind of a demo.  Have you considered making a collection of location coordinates that map to locations on your map and then using Rand() to pick the index of one of those?

UpdateContext({random:Round((Rand()*25),0)})

[ericonline]

Hi @Pstork1 , 

Thanks for the reply. This would be a good solution if I was calling an API and bringing back a map with actual coordinates. As you said, I'm demoing and just need to make the Map Pin randomly stay within the bounds of the map image. 

Just tried this to no avail:

Set(varRandX, Rand() * (imgMap.Width + imgMap.X));
Set(varRandY, Rand() * (imgMap.Height - imgMap.Y))

[Pstork1]

This won't keep it from showing up in inappropriate places on the map.  But if you just want to make sure its inside the boundaries try this:

UpdateContext({randomX:Round((Rand()*1000),0)+300})
UpdateContext({random:Round((Rand()*550),0)+120})

[Pstork1 · Accepted solution]

Or this if you want it to dynamically adjust to the image size and placement.

UpdateContext({randomX:Round((Rand()*imgMap.Width),0)+imgMap.X})
UpdateContext({random:Round((Rand()*imgMap.Height),0)+imgMap.Y})

[ericonline · Accepted solution]

Sweet! Thanks for the guidance @Pstork1. 

Heres what I finally went with:

Set(varRandX, (Rand() * (imgMap.Width - icnMapPin.Width)) + imgMap.X);       
Set(varRandY, (Rand() * (imgMap.Height - icnMapPin.Height)) + imgMap.Y)

Key was subtracting the MapPin.Width and .Height from the map to create a "buffer" for the pin itself. 

[Pstork1]

I didn't think about that.  Good catch,