60 lines
1.7 KiB
TypeScript
60 lines
1.7 KiB
TypeScript
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const AXIS_DECIMALS = 2
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export function roundAxisValue(val: number, decimals = AXIS_DECIMALS): number {
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if (!Number.isFinite(val)) return 0
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const factor = 10 ** decimals
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return Math.round(val * factor) / factor
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}
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/** Y 轴刻度：最多 2 位小数，末尾 0 去掉（如 1.00 → 1，0.10 → 0.1） */
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export function formatAxisLabel(value: number): string {
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if (!Number.isFinite(value)) return '0'
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return String(Number(roundAxisValue(value).toFixed(AXIS_DECIMALS)))
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}
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/** 瞬间波形 Y 轴范围 */
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export function calcShuYAxisRange(dataMin: number, dataMax: number): { min: number; max: number } {
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const min = Number(dataMin)
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const max = Number(dataMax)
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if (!Number.isFinite(min) || !Number.isFinite(max)) {
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return { min: 0, max: 1 }
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}
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let axisMax = max * 1.1
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let axisMin = min > 0 ? min - min * 0.1 : min * 1.1
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if (axisMax <= axisMin) {
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const pad = Math.abs(max) * 0.1 || 0.01
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axisMax = max + pad
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axisMin = min - pad
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}
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return {
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min: roundAxisValue(axisMin),
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max: roundAxisValue(axisMax)
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}
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}
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/** RMS 波形 Y 轴范围 */
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export function calcRmsYAxisRange(dataMin: number, dataMax: number): { min: number; max: number } {
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const min = Number(dataMin)
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const max = Number(dataMax)
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if (!Number.isFinite(min) || !Number.isFinite(max)) {
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return { min: 0, max: 1 }
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}
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let axisMax = max * 1.06 * 1.1
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let axisMin = min - min * 0.2
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if (axisMax <= axisMin) {
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const pad = Math.abs(max - min) * 0.1 || Math.abs(max) * 0.1 || 0.01
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axisMax = max + pad
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axisMin = min - pad
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}
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return {
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min: roundAxisValue(axisMin),
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max: roundAxisValue(axisMax)
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}
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}
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