feat(transform): add pack padding and direction

__tests__/plots/static/index.ts

@@ -311,3 +311,5 @@ export { premierLeagueTable } from './premier-league-table';
 export { singlePointBasic } from './single-point-basic';
 export { populationFlowChordDefault } from './population-flow-chord-default';
 export { aaplLineRrangeXY } from './aapl-line-rangeXY';
+export { titanicPointPackSharedRowData } from './titanic-point-pack-shared-row-data';
+export { titanicPointPackSharedDataPadding } from './titanic-point-pack-shared-data-padding';

__tests__/plots/static/titanic-point-pack-shared-data-padding.ts

@@ -0,0 +1,41 @@
+import { G2Spec } from '../../../src';
+
+export function titanicPointPackSharedDataPadding(): G2Spec {
+  return {
+    type: 'facetRect',
+    data: {
+      type: 'fetch',
+      value: 'data/titanic.csv',
+      transform: [
+        {
+          type: 'sortBy',
+          fields: ['survived'],
+        },
+        {
+          type: 'map',
+          callback: ({ survived, ...d }) => ({
+            ...d,
+            survived: survived + '',
+          }),
+        },
+      ],
+    },
+    shareData: true,
+    encode: {
+      x: 'pclass',
+    },
+    children: [
+      {
+        type: 'point',
+        transform: [{ type: 'pack', padding: 2 }],
+        legend: {
+          color: { labelFormatter: (d) => (d === '1' ? 'Yes' : 'No') },
+        },
+        encode: {
+          color: 'survived',
+          shape: 'point',
+        },
+      },
+    ],
+  };
+}

__tests__/plots/static/titanic-point-pack-shared-row-data.ts

@@ -0,0 +1,41 @@
+import { G2Spec } from '../../../src';
+
+export function titanicPointPackSharedRowData(): G2Spec {
+  return {
+    type: 'facetRect',
+    data: {
+      type: 'fetch',
+      value: 'data/titanic.csv',
+      transform: [
+        {
+          type: 'sortBy',
+          fields: ['survived'],
+        },
+        {
+          type: 'map',
+          callback: ({ survived, ...d }) => ({
+            ...d,
+            survived: survived + '',
+          }),
+        },
+      ],
+    },
+    shareData: true,
+    encode: {
+      x: 'pclass',
+    },
+    children: [
+      {
+        type: 'point',
+        transform: [{ type: 'pack', direction: 'row' }],
+        legend: {
+          color: { labelFormatter: (d) => (d === '1' ? 'Yes' : 'No') },
+        },
+        encode: {
+          color: 'survived',
+          shape: 'point',
+        },
+      },
+    ],
+  };
+}

site/docs/spec/transform/pack.zh.md

@@ -52,3 +52,10 @@ facetRect
 
 chart.render();
 ```
+
+## 选项
+
+| 属性               | 描述                                           | 类型                 | 默认值                 |
+|-------------------|------------------------------------------------|---------------------|-----------------------|
+| padding           | 每个元素之间的间距，单位为px                           | `number`            | `0`                   |  
+| direction         | 元素的堆叠方向                                    | `'row' \| 'col'`      | `col`         |

src/spec/transform.ts

@@ -223,6 +223,8 @@ export type FlexXTransform = {
 
 export type PackTransform = {
   type?: 'pack';
+  padding?: number;
+  direction?: 'row' | 'col';
 };
 
 export type Reducer =

src/transform/pack.ts

@@ -1,68 +1,74 @@
 import { deepMix } from '@antv/util';
 import { TransformComponent as TC } from '../runtime';
 import { calcBBox } from '../utils/vector';
+import { PackTransform } from '../spec';
 
-export type PackOptions = Record<string, unknown>;
+export type PackOptions = Omit<PackTransform, 'type'>;
 
-function modifier(P, count, layout) {
-  const pcount = P.length;
-  if (pcount === 0) return [];
+function pack(options: PackOptions) {
+  const { padding = 0, direction = 'col' } = options;
+  return (P, count, layout) => {
+    const pcount = P.length;
+    if (pcount === 0) return [];
 
-  // col * row >= count
-  // row is close to col * aspect, so
-  // col * (col * aspect) >= count
-  const { innerWidth, innerHeight } = layout;
-  const aspect = innerHeight / innerWidth;
-  let col = Math.ceil(Math.sqrt(count / aspect));
+    // col * row >= count
+    // row is close to col * aspect, so
+    // col * (col * aspect) >= count
+    const { innerWidth, innerHeight } = layout;
+    const aspect = innerHeight / innerWidth;
+    let col = Math.ceil(Math.sqrt(count / aspect));
 
-  // Increase col to avoid total height of packed shape
-  // being large than height of bbox.
-  let size = innerWidth / col;
-  let row = Math.ceil(count / col);
-  let h0 = row * size;
-  while (h0 > innerHeight) {
-    col = col + 1;
-    size = innerWidth / col;
-    row = Math.ceil(count / col);
-    h0 = row * size;
-  }
+    // Increase col to avoid total height of packed shape
+    // being large than height of bbox.
+    let size = innerWidth / col;
+    let row = Math.ceil(count / col);
+    let h0 = row * size;
+    while (h0 > innerHeight) {
+      col = col + 1;
+      size = innerWidth / col;
+      row = Math.ceil(count / col);
+      h0 = row * size;
+    }
 
-  // Some offset to increase the space usage.
-  const space = innerHeight - row * size;
-  const intervalY = row <= 1 ? 0 : space / (row - 1);
-  const [offsetX, offsetY] =
-    row <= 1
-      ? [(innerWidth - pcount * size) / (pcount - 1), (innerHeight - size) / 2]
-      : [0, 0];
+    // Some offset to increase the space usage.
+    const space = innerHeight - row * size;
+    const intervalY = row <= 1 ? 0 : space / (row - 1);
+    const [offsetX, offsetY] =
+      row <= 1
+        ? [
+            (innerWidth - pcount * size) / (pcount - 1),
+            (innerHeight - size) / 2,
+          ]
+        : [0, 0];
 
-  return P.map((points, m) => {
-    const [x, y, width, height] = calcBBox(points);
+    return P.map((points, m) => {
+      const [x, y, width, height] = calcBBox(points);
+      const i = direction === 'col' ? m % col : Math.floor(m / row);
+      const j = direction === 'col' ? Math.floor(m / col) : m % row;
 
-    const i = m % col;
-    const j = Math.floor(m / col);
+      const newX = i * size;
+      const newY = (row - j - 1) * size + space;
 
-    const newX = i * size;
-    const newY = (row - j - 1) * size + space;
+      const sx = (size - padding) / width;
+      const sy = (size - padding) / height;
 
-    const sx = size / width;
-    const sy = size / height;
-
-    // Translate the shape and mark to make sure the center of
-    // shape is overlap before and after scale transformation.
-    const tx = newX - x + offsetX * i;
-    const ty = newY - y - intervalY * j - offsetY;
-    return `translate(${tx}, ${ty}) scale(${sx}, ${sy})`;
-  });
+      // Translate the shape and mark to make sure the center of
+      // shape is overlap before and after scale transformation.
+      const tx = newX - x + offsetX * i + (1 / 2) * padding;
+      const ty = newY - y - intervalY * j - offsetY + (1 / 2) * padding;
+      return `translate(${tx}, ${ty}) scale(${sx}, ${sy})`;
+    });
+  };
 }
 
 /**
  * Uniform pack to avid overlap.
  * @todo Improve or change algorithm to increase space usage.
  * @todo Take some special case into account.
  */
-export const Pack: TC<PackOptions> = () => {
+export const Pack: TC<PackOptions> = (options) => {
   return (I, mark) => {
-    return [I, deepMix({}, mark, { modifier, axis: false })];
+    return [I, deepMix({}, mark, { modifier: pack(options), axis: false })];
   };
 };