La función threshold.copy() en d3.js se usa para crear y devolver la copia exacta de la escala de umbral. Cualquier cambio en la escala original no afectará la escala de la copia.
Sintaxis:
threshold.copy();
Parámetros: Esta función no acepta ningún parámetro.
Valor devuelto: esta función devuelve una copia exacta de la escala de umbral original.
Ejemplo 1:
HTML
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<meta name="viewport" path1tent=
"width=device-width,initial-scale=1.0" />
<script src="https://d3js.org/d3.v4.min.js">
</script>
</head>
<body>
<h2 style="color:green">GeekforGeeks</h2>
<p>threshold.copy() Function </p>
<script>
var threshold = d3.scaleThreshold()
// Domain
.domain([1, 2, 3, 4])
// Range for the domain
.range([10, 20, 30, 40, 50]);
document.write("<h3>threshold(1): "
+ threshold(1) + "</h3>");
document.write("<h3>threshold(3): "
+ threshold(3) + "</h3>");
document.write(
"<p> This is from copy scale.</p>");
var thresholdCopy = threshold.copy();
document.write("<h3>thresholdCopy(1): "
+ thresholdCopy(1) + "</h3>");
document.write("<h3>thresholdCopy(3): "
+ thresholdCopy(3) + "</h3>");
</script>
</body>
</html>
Producción:
Ejemplo 2:
HTML
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<meta name="viewport" path1tent=
"width=device-width,initial-scale=1.0" />
<script src="https://d3js.org/d3.v4.min.js">
</script>
</head>
<body>
<h2 style="color:green">GeekforGeeks</h2>
<p>threshold.copy() Function </p>
<script>
var threshold = d3.scaleThreshold()
// Domain
.domain([1, 2, 3, 4])
// Range for the domain
.range([10, 20, 30, 40, 50]);
var thresholdCopy = threshold.copy();
document.write(
"<div style=line-height:5px><h3>threshold(1): "
+ threshold(1) + "</h3>");
document.write("<h3>threshold(3): "
+ threshold(3) + "</h3>");
// Making changes on the original scale
threshold.range([100, 200, 300, 400, 500]);
document.write(
"<p> After making changes in the original scale</p>");
document.write("<h3>threshold(3): "
+ threshold(3) + "</h3>");
document.write("<p> This is from copy scale.</p>");
document.write("<h3>thresholdCopy(1): "
+ thresholdCopy(1) + "</h3>");
document.write("<h3>thresholdCopy(3): "
+ thresholdCopy(3) + "</h3></div>");
</script>
</body>
</html>
Producción:
