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WIP padLinear #213

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WIP padLinear #213

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19f70fa
Expose pad from linear.
curran Jun 17, 2020
b8bdb34
Expose padLinear, add tests
curran Jun 17, 2020
662820d
Bring back all tests.
curran Jun 17, 2020
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3 changes: 2 additions & 1 deletion src/index.js
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Original file line number Diff line number Diff line change
Expand Up @@ -8,7 +8,8 @@ export {
} from "./identity.js";

export {
default as scaleLinear
default as scaleLinear,
pad as padLinear
} from "./linear.js";

export {
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5 changes: 5 additions & 0 deletions src/linear.js
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Original file line number Diff line number Diff line change
Expand Up @@ -70,3 +70,8 @@ export default function linear() {

return linearish(scale);
}

export function pad([x0, x1], k) {
var dx = (x1 - x0) * k / 2;
return [x0 - dx, x1 + dx];
}
6 changes: 6 additions & 0 deletions test/linear-test.js
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Expand Up @@ -509,3 +509,9 @@ tape("linear.copy() returns a copy with changes to the unknown value are isolate
test.equal(x.unknown(), 2);
test.end();
});

tape("padLinear returns a padded domain array", function(test) {
test.deepEqual(scale.padLinear([0, 8], 0.5), [-2, 10])
test.deepEqual(scale.padLinear([0, 8], 0.25), [-1, 9])
test.end();
});