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joshahayes

Applying a fill to an element based off of a D3 colour scale

Go to solution Solved by OSUblake,

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Hi,

I've got an SVG map made out of hexagons / polygons and in each polygon, there is a data-attribute which I use to give each polygon's it's corresponding colour using the D3 Colour Scales method. 

 

    for (i = 0; i < poly.length; i++) {

        var data = parseInt(poly[i].getAttribute('data-canopy'));
        poly[i].style.fill = grayscaleCol(data);
    }

So it goes through an array of all the polygons, gets the data attribute which is called 'canopy' and then provides a fill based on the data using the colour scale 'grayscaleCol'.

 

This is what the colour scale looks like: 

var grayscaleCol = d3.scaleLinear().domain([5, 10, 15, 25, 50, 75]).range(['#727272', '#686868', '#515151', '#3A3A3A', '#252525', '#131313']);

 

I'm still very much a newb when it comes to GSAP but would it be possible to have our gsap target be an array of elements and then animate the fill of each element using the 'canopy' data attribute (which is a number and is different for each polygon) and the colour scale? Could I use 'this.getAttribute' within gsap or anything similar?

 

Cheers!

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  • Solution

Hi Josh, 

 

If I understand your question correctly, you should be able to use a function to grab the color like this.

 

gsap.to(poly, {
  fill: (i, el) => grayscaleCol(+el.getAttribute("data-canopy"))
});

 

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thanks Blake! That worked perfectly

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