lineHeight option

Author: mbostock

README.md

@@ -1081,6 +1081,9 @@ In addition to the [standard mark options](#marks), the following optional chann
 
 The following text-specific constant options are also supported:
 
+* **textAnchor** - TODO
+* **lineAnchor** - TODO
+* **lineHeight** - TODO
 * **fontFamily** - the font name; defaults to [system-ui](https://drafts.csswg.org/css-fonts-4/#valdef-font-family-system-ui)
 * **fontSize** - the font size in pixels; defaults to 10
 * **fontStyle** - the [font style](https://developer.mozilla.org/en-US/docs/Web/CSS/font-style); defaults to normal

src/marks/text.js

@@ -17,6 +17,7 @@ export class Text extends Mark {
       text = indexOf,
       textAnchor,
       lineAnchor = "middle",
+      lineHeight = 1,
       fontFamily,
       fontSize,
       fontStyle,
@@ -41,6 +42,7 @@ export class Text extends Mark {
     this.rotate = crotate;
     this.textAnchor = impliedString(textAnchor, "middle");
     this.lineAnchor = keyword(lineAnchor, "lineAnchor", ["top", "middle", "bottom"]);
+    this.lineHeight = +lineHeight;
     this.fontFamily = string(fontFamily);
     this.fontSize = cfontSize;
     this.fontStyle = string(fontStyle);
@@ -79,7 +81,7 @@ export class Text extends Mark {
   }
 }
 
-function applyMultilineText(selection, {lineAnchor}, T) {
+function applyMultilineText(selection, {lineAnchor, lineHeight}, T) {
   if (!T) return;
   const format = isTemporal(T) ? isoFormat : isNumeric(T) ? formatNumber() : string;
   selection.each(function(i) {
@@ -90,7 +92,7 @@ function applyMultilineText(selection, {lineAnchor}, T) {
       for (let i = 0; i < n; ++i) {
         const tspan = document.createElementNS(namespaces.svg, "tspan");
         tspan.setAttribute("x", 0);
-        tspan.setAttribute("y", `${y + i}em`);
+        tspan.setAttribute("y", `${y + i * lineHeight}em`);
         tspan.textContent = lines[i];
         this.appendChild(tspan);
       }