Circular Slider in Kivy - kivy

I need to create a circular slider in kivy which be able to move the handle angular on the circle like the picture below enter image description here

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Detech wall and change wall color using ARkit swift

I need to build an app like Asian Paint or Dulux, in which it will detect the wall and user will select color for wall and virtual color will be visible on wall.
Mostly I found example for placing image but I want to change wall color.
You need to find a vertical plane, then add your custom plane with the color you want to paint and put it on the scene.

It's possible to use any borderless custom marker for AR.js

I am using custom marker for AR.js which is working fine, But I need to create a black border less or margin less custom marker for my project but when i create it along with it's pattern it's not effected rather it's detect the old custom marker. Please help me if it's possible.

circular dial using small small buttons in swift

I want to create a circular dial in swift. The entire circle is divided into images and I want to place those images to create a circle. Each image is clickable so that one image placed in centre of the arch could get change.
So I need to create circle using buttons in swift. Please note that I don't want to create a circular button, I want to create circle using button. Something like what is done in below link using labels.
Draw text along circular path in Swift for iOS
Suppose we have n images to arrange around the circumference of a circle of radius r. The circle is 2π radians, so use polar coordinates from the center of the circle to find the points on the circumference at angles that are multiples of 2π/n. Now center the images (buttons) at those points.

How to show shadow around the dial in activity gauge chart?

I am using highchart plugin to draw charts in a website.I need dark black shadow around the dial. I am attaching image what I have done and what I need to achieve. The left image is a real graph and right one is the image which is the target. I need to make both identical.

Set Clickable Area of an Image in Corona

I was trying to create a tic-tac-toe-like game but this time the board is a collection of hexagons in a rhombus shape. See image below:
Each hexagon is an image:
And each image has its own event listener. I am having problem with the clickable area, every time I click the lower two hexagons from the top. The top hexagon receives the tap event. I suspect that its because the PNG image has some portion occupying the lower two hexagons. Please give me recommendations.

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