You can use instance variable to control opacity
https://drive.google.com/file/d/1lE0ATF8oK6CPFRubed_HJSk3m0Lv47Lv/view?usp=sharing
It's hard to say something without your project file. But if you want to create lines with dragging you can use a system like that.
https://drive.google.com/file/d/1g5rVslaRL9SS3m5bLfwSdTcl2a-dv4jB/view?usp=sharing
For your first question it's just limiting the drag drop area
and for second one i use destination in method from blending modes
https://editor.construct.net/#open=blend-modes
It's funny.Totally unaware of that, i was working on a similar project.
https://www.construct.net/en/free-online-games/magnifying-glass-23047/play
Ashley I'm not sure it's a bug or not, but if i preview locally drag drop behavior works normally. But in arcade version drag drop works outside (diagonal) parts of the magnifying glass.
You can use a system like that.
Update: I added some waits. I don't observe a problem right now. Probably GET function trying to read values before JSON is updated.
drive.google.com/file/d/1cqaX9-c8ESyCH5vddb9Ojr5uzo6uekcp/view
I think you find a bug. JSON Data is not updated after some removes. Actually it look like updated but JSON.Get function sometimes return null values.
Develop games in your browser. Powerful, performant & highly capable.
https://drive.google.com/file/d/1IgYRwCNrt3OAyuKnYF5RAtMLT51WvXWm/view?usp=sharing
https://drive.google.com/file/d/1gHKlcbATTdlT6jD0zTTJOotZEYKwgqrj/view?usp=sharing
An experiment with source code (c3p)
https://www.construct.net/en/free-online-games/simple-one-point-perspective-22445/play
if you use a monospace font or a sprite font, you can do some calculations
https://drive.google.com/file/d/1ZKe6oDW63TadkGy-U6c1Y8S-CkHtHF1G/view?usp=sharing
You can use advanced random plugin with instance variables
https://drive.google.com/file/d/1CDNs_ekp6Nq8eFgj61x8TPmGNCdTWRTL/view?usp=sharing
https://downloads.construct.net/uploads/120/17380/c8913335-5018-4be7-967d-0fd3a3031d40/money.capx
This is not exactly the kind of process you want, but it could help.
https://drive.google.com/file/d/1lcvW1ng4FMXC8ExSjnH4QIA8V7rbS2tH/view?usp=sharing