The process of converting RaphaelJS patterns into an SVG format

I am currently creating an interactive map using AngularJS and RaphaelJS.

The entire SVG object is generated within a directive, and my goal is to assign different colors to each area on the map.

Specifically, I want some regions to have a striped pattern. After extensive research, I found a potential solution:

background-color: orange;
background-image: repeating-linear-gradient(45deg, transparent, transparent 5px, rgba(0,0,0,1) 5px, rgba(0,0,0,1) 10px);

Additionally, I aim to switch this pattern to black and red stripes upon hover, reverting back to black and orange stripes when the mouse moves away.

Unfortunately, I discovered that there isn't an equivalent of "repeating-linear-gradient" in RaphaelJS (correct me if I'm wrong), leaving me unsure about how to proceed.

I attempted to achieve similar effects with gradients, but ran into issues (the hover result didn't meet expectations. Any ideas why?)

Below is a snippet of the code within the directive:

var paper = new Raphael(element[0], 600, 600);

var attr = {
    fill: "#f5f5f5",
    stroke: "#222",
    "stroke-width": 1,
    "stroke-linejoin": "round"
};

var fr = {};
fr.area1 = paper.path("...").attr(attr).attr({href: "#"});
fr.area2 = paper.path("...").attr(attr).attr({href: "#"});
fr.area3 = paper.path("...").attr(attr).attr({href: "#"});

[...]

var state = 'area3';

attr = {      
 fill: '45-' + color1 + '-' + color2,
 stroke: "#222"};

fr[state].attr(attr);

(function(state) {

    var area = fr[state];

    area[0].style.cursor = "pointer";
    area[0].onmouseover = function() {

        area.animate({
            fill: '45-' + color3 + '-' + color2,
            stroke: "#222"
        }, 10);
        area.toFront();
    };

    area[0].onmouseout = function() {
        area.animate({
            fill: '45-' + color1 + '-' + color2,
            stroke: "#222"
        }, 300);
        area.toFront();
    };
})(state);

Thank you,

Answer №1

It appears that RaphaelJS does not have support for animated gradients, as mentioned in this discussion. To prevent a black flash effect during the animation, it is recommended to call animate with a duration of 0 ms. You can view a working example in this demo.

If you want to achieve a striped effect, you can utilize the following function (based on a modified version of this solution):

function gradientString(colors, step) {
    var gradient = '45-' + colors[0],
        stripe = false,
        len = colors.length,
        i;

    for (i = 0; i < 100/step; i += 1) {
        gradient += '-' + colors[i % len] + ':' + i * step + '-' + colors[(i+1) % len] + ':' + i * step;
    }

    return gradient;
}

You can see the stripes and desired behavior achieved in this example.

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