如何计算第三个值所在的两个值范围之间的百分比

Question

例子：

我正在尝试计算用于找到第三个值的两个值之间的百分比的计算。

示例：范围是 -46 到 195。值 -46 表示 0%，值 195 表示范围的 100%。值 65 占该范围的多少百分比？

值最小值=-46

值最大值=195

现在值=65

值百分比 = ?

我尝试了以下算法，但它不起作用：

const log = (txt) => console.log(txt, 'instead of 100%');

function getValueNowInPercent(valueMin, valueMax, valueNow){
  const diff = valueMax - valueMin;
  const percent = valueNow / diff * 100;  
  return percent + '%';
}

let valueMin, valueMax, valueNow;

valueMin = 0; valueNow = 50; valueMax = 100;
log(getValueNowInPercent(valueMin,valueNow,valueMax));
==> 200% instead of 100%

valueMin = -100; valueNow = 0; valueMax = 100;
log(getValueNowInPercent(valueMin,valueNow,valueMax));
==> 100% instead of 100%

valueMin = 0; valueNow = 100; valueMax = 200;
log(getValueNowInPercent(valueMin,valueNow,valueMax));
==> 200% instead of 100%

valueMin = -200; valueNow = 0; valueMax = 200;
log(getValueNowInPercent(valueMin,valueNow,valueMax));
==> 100% instead of 100%

Answer 1

如何将其映射到域范围问题，其中域将是您的最小值和最大值，范围将从 0 到 100

function mapBetween(currentNum, minAllowed, maxAllowed, min, max) {
  return (maxAllowed - minAllowed) * (currentNum- min) / (max - min) + minAllowed;
}

console.log (mapBetween(-46,0,100,-46,195))
console.log (mapBetween(195,0,100,-46,195))
console.log (mapBetween(65,0,100,-46,195))
console.log (mapBetween(100,0,100,0,200))