default filter

src/axis.js

@@ -3,9 +3,8 @@ import {boolean, take, number, string, keyword, maybeKeyword, constant, isTempor
 import {formatIsoDate} from "./format.js";
 import {radians} from "./math.js";
 import {applyAttr, impliedString} from "./style.js";
-import {Decoration} from "./decoration.js";
 
-export class AxisX extends Decoration {
+export class AxisX {
   constructor({
     name = "x",
     axis,
@@ -23,7 +22,6 @@ export class AxisX extends Decoration {
     ariaLabel,
     ariaDescription
   } = {}) {
-    super();
     this.name = name;
     this.axis = keyword(axis, "axis", ["top", "bottom"]);
     this.ticks = ticks;
@@ -99,7 +97,7 @@ export class AxisX extends Decoration {
   }
 }
 
-export class AxisY extends Decoration {
+export class AxisY {
   constructor({
     name = "y",
     axis,
@@ -117,7 +115,6 @@ export class AxisY extends Decoration {
     ariaLabel,
     ariaDescription
   } = {}) {
-    super();
     this.name = name;
     this.axis = keyword(axis, "axis", ["left", "right"]);
     this.ticks = ticks;

src/marks/area.js

@@ -7,6 +7,7 @@ import {maybeIdentityX, maybeIdentityY} from "../transforms/identity.js";
 import {maybeStackX, maybeStackY} from "../transforms/stack.js";
 
 const defaults = {
+  filter: null,
   ariaLabel: "area",
   strokeWidth: 1,
   strokeMiterlimit: 1
@@ -29,9 +30,6 @@ export class Area extends Mark {
     );
     this.curve = Curve(curve, tension);
   }
-  filter(I) {
-    return I;
-  }
   render(I, {x, y}, channels, dimensions) {
     const {x1: X1, y1: Y1, x2: X2 = X1, y2: Y2 = Y1} = channels;
     const {dx, dy} = this;

src/marks/line.js

@@ -6,6 +6,7 @@ import {applyDirectStyles, applyIndirectStyles, applyTransform, applyGroupedChan
 import {applyGroupedMarkers, markers} from "./marker.js";
 
 const defaults = {
+  filter: null,
   ariaLabel: "line",
   fill: "none",
   stroke: "currentColor",
@@ -29,9 +30,6 @@ export class Line extends Mark {
     this.curve = Curve(curve, tension);
     markers(this, options);
   }
-  filter(I) {
-    return I;
-  }
   render(I, {x, y}, channels, dimensions) {
     const {x: X, y: Y} = channels;
     const {dx, dy} = this;

src/plot.js

@@ -1,7 +1,7 @@
 import {create, cross, difference, groups, InternMap, select} from "d3";
 import {Axes, autoAxisTicks, autoScaleLabels} from "./axes.js";
 import {Channel, channelSort} from "./channel.js";
-import {Decoration} from "./decoration.js";
+import {defined} from "./defined.js";
 import {Dimensions} from "./dimensions.js";
 import {Legends, exposeLegends} from "./legends.js";
 import {arrayify, isOptions, keyword, range, first, second, where} from "./options.js";
@@ -99,7 +99,8 @@ export function plot(options = {}) {
   for (const mark of marks) {
     const channels = markChannels.get(mark) ?? [];
     const values = applyScales(channels, scales);
-    const index = mark.filter(markIndex.get(mark), channels, values);
+    let index = markIndex.get(mark);
+    if (mark.filter != null) index = mark.filter(index, channels, values);
     const node = mark.render(index, scales, values, dimensions, axes);
     if (node != null) svg.appendChild(node);
   }
@@ -136,15 +137,25 @@ export function plot(options = {}) {
   return figure;
 }
 
-export class Mark extends Decoration {
+function defaultFilter(index, channels, values) {
+  for (const [name, {filter = defined}] of channels) {
+    if (name !== undefined && filter !== null) {
+      const value = values[name];
+      index = index.filter(i => filter(value[i]));
+    }
+  }
+  return index;
+}
+
+export class Mark {
   constructor(data, channels = [], options = {}, defaults) {
-    super();
     const {facet = "auto", sort, dx, dy, clip} = options;
     const names = new Set();
     this.data = data;
     this.sort = isOptions(sort) ? sort : null;
     this.facet = facet == null || facet === false ? null : keyword(facet === true ? "include" : facet, "facet", ["auto", "include", "exclude"]);
     const {transform} = basic(options);
+    this.filter = defaults?.filter === undefined ? defaultFilter : defaults.filter;
     this.transform = transform;
     if (defaults !== undefined) channels = styles(this, options, channels, defaults);
     this.channels = channels.filter(channel => {
@@ -321,7 +332,8 @@ class Facet extends Mark {
               for (let i = 0; i < marks.length; ++i) {
                 const mark = marks[i];
                 const values = marksValues[i];
-                const index = mark.filter(marksFacetIndex[i], marksChannels[i], values);
+                let index = marksFacetIndex[i];
+                if (mark.filter != null) mark.filter(index, marksChannels[i], values);
                 const node = mark.render(index, scales, values, subdimensions);
                 if (node != null) this.appendChild(node);
               }