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How to make a colourful interactive GUI spectrum slider?

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Hannah
Hannah on 14 Sep 2021
Answered: Mohammad Sami on 15 Sep 2021
Hello, I want to make a colorful spectrum where the user can use a slider to control the input value. Input values go from 20 to 1112.5 with a resolution of 0.1. every input value corresponds to an output value which I have stored. I know how to make the user type their input value and return the corresponding output but I just have no idea how to make the GUI spectrum slider. Every input corresponds to a percentage (i.e. the output is a percentage) and I want the shading of the spectrum to be greener as it gets closer to 100% and more red as it gets closer to 0%.
Can someone help me please? :)
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Answers (1)

Mohammad Sami
Mohammad Sami on 15 Sep 2021
While there is no slider object which have the spectrum as the background, you can however achieve this effect by layering uislider on top of an uiimage with spectrum. I used a gridlayout, but you can also set the position property. However in case of resize you will then have to set the position again. Therefore using a gridlayout would be preferable.
a = uifigure;
g = uigridlayout(a,[5 5]);
b = uiimage(g,'ImageSource','spectrum.png','ScaleMethod','fill');
b.Layout.Row = 2;
b.Layout.Column = 2;
c = uislider(g);
c.Layout.Row = 2;
c.Layout.Column = 2;

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