I have been attempting to use the Raphael JavaScript library to draw a percentage of a circle anti-clockwise, whilst specifying the starting position.
At the moment I have managed to get it drawing anti-clockwise and starting at the 6 o'clock position using the code below, but I would like it to start drawing at the 4 o'clock position (or ideally at any position I specify).
var amount = 75;
var archtype = Raphael("canvas", 500, 500);
archtype.customAttributes.arc = function (xloc, yloc, value, total, R) {
var alpha = 360 / total * value,
a = (-90 - alpha) * Math.PI / 180,
x = xloc - R * Math.cos(a),
y = yloc - R * Math.sin(a),
path;
console.log('x - ' + x);
console.log('y - ' + y);
if (total == value) {
path = [
["M", xloc, yloc - R],
["A", R, R, 0, 1, 1, xloc - 0.01, yloc - R]
];
} else {
path = [
["M", xloc, yloc + R],
["A", R, R, 0, +(alpha > 180), 0, x, y]
];
}
return {
path: path
};
};
var my_arc = archtype.path().attr({
"stroke": "#00A5FF",
"stroke-width": 14,
arc: [90, 90, 0, 100, 80]
});
my_arc.animate({
arc: [90, 90, amount, 100, 80]
}, 1500);
I am just starting out using the Raphael library and would really appreciate any help.
Thanks