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fix: symmetric log charting #4

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fix: symmetric log charting #4

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3ebe24c
fix: symmetric log charting
hanjano Feb 13, 2025
a6dd7fd
fix: lint
hanjano Feb 14, 2025
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15 changes: 9 additions & 6 deletions src/scale/Log.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -42,14 +42,17 @@ const mathLog = Math.log;
* symmetric log, allowing negative values for logarithmic scales
*/

const C = mathLog(10)
function symMathLog(x: number, linthresh: number = 0.03): number {
if (x >= -linthresh && x <= linthresh) {
const mul = (2 + mathLog(linthresh)) / linthresh;
return x * mul;
}

function symMathLog(x: number): number {
if (x >= 0) {
return mathLog(1 + x / C);
if (x > 0) {
return 2 + mathLog(x);
}
return -mathLog(1 - x / C);

return -2 - mathLog(-x);
}

/**
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