42 lines
1.2 KiB
JavaScript
42 lines
1.2 KiB
JavaScript
import { helper } from '@ember/component/helper';
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// arguments should be a list of {x: numLike, y: numLike} points
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// numLike meaning they should be numbers (or numberlike strings i.e. "1" vs 1)
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const curve = function() {
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const args = [...arguments];
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// our arguments are destination first control points last
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// SVGs are control points first destination last
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// we 'shift,push' to turn that around and then map
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// through the values to convert it to 'x y, x y' etc
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// whether the curve is cubic-bezier (C) or quadratic-bezier (Q)
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// then depends on the amount of control points
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// `Q|C x y, x y, x y` etc
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return `${arguments.length > 2 ? `C` : `Q`} ${args
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.concat(args.shift())
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.map(p => Object.values(p).join(' '))
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.join(',')}`;
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};
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const move = function(d) {
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return `
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M ${d.x} ${d.y}
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`;
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};
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export default helper(function([dest], hash) {
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const src = hash.src || { x: 0, y: 0 };
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const type = hash.type || 'cubic';
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let args = [
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dest,
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{
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x: (src.x + dest.x) / 2,
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y: src.y,
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},
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];
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if (type === 'cubic') {
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args.push({
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x: args[1].x,
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y: dest.y,
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});
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}
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return `${move(src)}${curve(...args)}`;
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});
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